Put the provided CGLib dependency in the com.comphenix namespace.

That way, one failing the other won't cause any problems.

ItemDisguise/.classpath

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry including="**/*.java" kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry combineaccessrules="false" kind="src" path="/ProtocolLib"/>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

ItemDisguise/.gitignore

@@ -0,0 +1 @@
+target/

ItemDisguise/.project

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ItemDisguise</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

ItemDisguise/.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,12 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.6

ItemDisguise/.settings/org.eclipse.m2e.core.prefs

@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

ItemDisguise/pom.xml

@@ -0,0 +1,72 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.comphenix.itemdisguise</groupId>
+  <artifactId>ItemDisguise</artifactId>
+  <version>1.0.0</version>
+  <name>Item Disguise</name>
+  <description>Change the appearance of inventory items.</description>
+  
+  <properties>
+    <project.build.sourceEncoding>cp1252</project.build.sourceEncoding>
+  </properties>
+  
+  <repositories>
+    <repository>
+      <id>bukkit-rep</id>
+      <url>http://repo.bukkit.org/content/groups/public</url>
+    </repository>
+    <repository>
+      <id>comphenix-rep</id>
+      <name>Comphenix Maven Releases</name>
+      <url>http://repo.comphenix.net/content/groups/public</url>
+    </repository>
+  </repositories>
+  
+  <build>
+    <sourceDirectory>src/main/java</sourceDirectory>
+    <resources>
+      <resource>
+        <directory>src/main/java</directory>
+        <excludes>
+          <exclude>**/*.java</exclude>
+        </excludes>
+      </resource>
+    </resources>
+    <plugins>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  
+  <scm>
+    <connection>scm:git:git://github.com/aadnk/ProtocolLib.git</connection>
+    <developerConnection>scm:git:git@github.com:aadnk/ProtocolLib.git</developerConnection>
+    <url>https://github.com/aadnk/ProtocolLib</url>
+  </scm>
+  
+  <licenses>
+    <license>
+      <name>GNU GENERAL PUBLIC LICENSE - Version 2, June 1991</name>
+      <url>http://www.gnu.org/licenses/gpl-2.0.txt</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  <dependencies>
+  	<dependency>
+  		<groupId>org.bukkit</groupId>
+  		<artifactId>bukkit</artifactId>
+  		<version>1.3.2-R1.0</version>
+  	</dependency>
+  	<dependency>
+  		<groupId>com.comphenix.protocol</groupId>
+  		<artifactId>ProtocolLib</artifactId>
+  		<version>1.3.2</version>
+  	</dependency>
+  </dependencies>
+</project>

ItemDisguise/src/main/java/com/comphenix/itemdisguise/HideEnchantmentsListener.java

@@ -0,0 +1,122 @@
+/*
+ *  ItemDisguise - A simple Bukkit plugin that illustrates how to use ProtocolLib.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.itemdisguise;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.bukkit.Server;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.ConnectionSide;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.reflect.FieldAccessException;
+
+public class HideEnchantmentsListener {
+
+	private final Server server;
+	private final Logger logger;
+	
+	public HideEnchantmentsListener(Server server, Logger logger) {
+		this.server = server;
+		this.logger = logger;
+	}
+	
+	public void addListener(ProtocolManager protocolManager, JavaPlugin plugin) {
+
+		// Hide all enchantments
+		protocolManager.addPacketListener(new PacketAdapter(plugin, ConnectionSide.SERVER_SIDE, 0x67, 0x68, 0x3E) {
+			@Override
+			public void onPacketSending(PacketEvent event) {
+				PacketContainer packet = event.getPacket();
+				
+				try {
+					// Item packets
+					switch (event.getPacketID()) {
+					case 0x67: // Set slot
+						removeEnchantments(packet.getItemModifier().read(0));
+						break;
+						
+					case 0x68: // Set Window Items
+						ItemStack[] elements = packet.getItemArrayModifier().read(0);
+	
+						for (int i = 0; i < elements.length; i++) {
+							if (elements[i] != null) {
+								removeEnchantments(elements[i]);
+							}
+						}
+						break;
+						
+					case 0x3E: // Sound effect
+						event.setCancelled(true);
+						break;
+					}
+				
+				} catch (FieldAccessException e) {
+					logger.log(Level.SEVERE, "Couldn't access field.", e);
+				}
+			}
+		});
+		
+		// Censor
+		protocolManager.addPacketListener(new PacketAdapter(plugin, ConnectionSide.CLIENT_SIDE, 0x3) {
+			@Override
+			public void onPacketReceiving(PacketEvent event) {
+				if (event.getPacketID() == 0x3) {
+					try {
+						String message = event.getPacket().
+											getSpecificModifier(String.class).read(0);
+						
+						if (message.contains("shit") || message.contains("fuck")) {
+							event.setCancelled(true);
+							event.getPlayer().sendMessage("Bad manners!");
+						}
+						
+					} catch (FieldAccessException e) {
+						logger.log(Level.SEVERE, "Couldn't access field.", e);
+					}
+				}
+			}
+		});
+	}
+	
+	public Server getServer() {
+		return server;
+	}
+	
+	public void removeListener(ProtocolManager protocolManager, JavaPlugin plugin) {
+		// Just remove every adapter with this plugin
+		protocolManager.removePacketListeners(plugin);
+	}
+	
+	private void removeEnchantments(ItemStack stack) {
+		if (stack == null)
+			return;
+		
+		Object[] copy = stack.getEnchantments().keySet().toArray();
+		
+		for (Object enchantment : copy) {
+			stack.removeEnchantment((Enchantment) enchantment);
+		}
+	}
+}

ItemDisguise/src/main/java/com/comphenix/itemdisguise/ItemDisguiseMod.java

@@ -0,0 +1,99 @@
+/*
+ *  ItemDisguise - A simple Bukkit plugin that illustrates how to use ProtocolLib.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.itemdisguise;
+
+import java.util.logging.Logger;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.PacketContainer;
+
+public class ItemDisguiseMod extends JavaPlugin {
+	
+	private ProtocolManager protocolManager;
+	private Logger logger;
+	
+	private HideEnchantmentsListener enchantmentsListener;
+	
+	@Override
+	public void onEnable() {
+
+		logger = getLoggerSafely();
+		protocolManager = ProtocolLibrary.getProtocolManager();
+		
+		enchantmentsListener = new HideEnchantmentsListener(getServer(), logger);
+		enchantmentsListener.addListener(protocolManager, this);
+	}
+
+	@Override
+	public void onDisable() {
+		enchantmentsListener.removeListener(protocolManager, this);
+	}
+	
+	@Override
+	public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+		if (sender instanceof Player) {
+		
+			Player player = (Player) sender;
+			
+			if (label.equalsIgnoreCase("explosion")) {
+				PacketContainer fakeExplosion = protocolManager.createPacket(0x3C);
+				
+				// Set the coordinates
+				try {
+					fakeExplosion.getSpecificModifier(double.class).
+					    write(0, player.getLocation().getX()).
+					    write(1, player.getLocation().getY()).
+					    write(2, player.getLocation().getZ());
+					fakeExplosion.getSpecificModifier(float.class).
+						write(0, 3.0F);
+					
+					protocolManager.sendServerPacket(player, fakeExplosion);
+					
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+			}
+			
+			return true;
+		}
+		
+		return false;
+	}
+	
+	// Get the Bukkit logger first, before we try to create our own
+	private Logger getLoggerSafely() {
+		
+		Logger log = null;
+	
+		try {
+			log = getLogger();
+		} catch (Throwable e) {
+			// We'll handle it
+		}
+		
+		if (log == null)
+			log = Logger.getLogger("Minecraft");
+		return log;
+	}
+}

ItemDisguise/src/main/java/plugin.yml

@@ -0,0 +1,14 @@
+name: ItemDisguiseMod
+version: 1.0.0
+description: Change the appearance of inventory items.
+author: Comphenix
+website: http://www.comphenix.net/ItemDisguise
+
+main: com.comphenix.itemdisguise.ItemDisguiseMod
+depends: [ProtocolLib]
+database: false
+
+commands:
+   explosion:
+      description: Creates a fake explosion around the caller.
+      usage: /<command>

License.txt

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
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+
+  Finally, any free program is threatened constantly by software
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

ProtocolLib/.classpath

@@ -1,14 +1,27 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" path="src"/>
-	<classpathentry kind="src" output="class_test" path="test"/>
-	<classpathentry kind="lib" path="D:/Games/Minecraft/Server Mods/Server/craftbukkit-1.3.1-R2.0.jar"/>
-	<classpathentry kind="lib" path="lib/cglib-nodep-2.2.3.jar">
-		<attributes>
-			<attribute name="javadoc_location" value="jar:file:/D:/Kristian/Programmer/Binaries/cglib.2.2.3/cglib-docs-2.2.3.jar!/"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jre6"/>
-	<classpathentry kind="output" path="class"/>
-</classpath>
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry including="**/*.java" kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>

ProtocolLib/.gitignore

@@ -0,0 +1 @@
+target/

ProtocolLib/.project

@@ -1,17 +1,23 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>ProtocolLib</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-	</natures>
-</projectDescription>
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>ProtocolLib</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

ProtocolLib/.settings/org.eclipse.core.resources.prefs

@@ -0,0 +1,4 @@
+eclipse.preferences.version=1
+encoding//src/main/java=cp1252
+encoding//src/test/java=cp1252
+encoding/<project>=cp1252

ProtocolLib/.settings/org.eclipse.jdt.core.prefs

@@ -1,11 +1,12 @@
-eclipse.preferences.version=1
-org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
-org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
-org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
-org.eclipse.jdt.core.compiler.compliance=1.6
-org.eclipse.jdt.core.compiler.debug.lineNumber=generate
-org.eclipse.jdt.core.compiler.debug.localVariable=generate
-org.eclipse.jdt.core.compiler.debug.sourceFile=generate
-org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
-org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
-org.eclipse.jdt.core.compiler.source=1.6
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=1.6
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.6

ProtocolLib/.settings/org.eclipse.m2e.core.prefs

@@ -0,0 +1,4 @@
+activeProfiles=
+eclipse.preferences.version=1
+resolveWorkspaceProjects=true
+version=1

ProtocolLib/Java.xml

@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<project default="compile" name="Project ItemDisguise" basedir=".">
-    <!--ANT 1.7 is required                                        -->
-    <target name="compile">
-        <jar destfile="bin/ProtocolLib.jar" filesetmanifest="mergewithoutmain" excludes="test/*">
-            <manifest>
-                <attribute name="Main-Class" value="com.comphenix.itemdisguise.Application"/>
-                <attribute name="Class-Path" value="."/>
-            </manifest>
-            <fileset dir="class"/>
-            <zipfileset excludes="META-INF/*.SF" src="lib/cglib-nodep-2.2.3.jar"/>
-        </jar>
-    </target>
-</project>

ProtocolLib/dependency-reduced-pom.xml

@@ -0,0 +1,187 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.comphenix.protocol</groupId>
+  <artifactId>ProtocolLib</artifactId>
+  <name>ProtocolLib</name>
+  <version>1.4.0</version>
+  <description>Provides read/write access to the Minecraft protocol.</description>
+  <url>http://dev.bukkit.org/server-mods/protocollib/</url>
+  <developers>
+    <developer>
+      <id>aadnk</id>
+      <name>Kristian S. Stangeland</name>
+      <email>kr_stang@hotmail.com</email>
+      <url>http://comphenix.net/</url>
+      <roles>
+        <role>developer</role>
+        <role>maintainer</role>
+      </roles>
+      <timezone>1</timezone>
+    </developer>
+  </developers>
+  <licenses>
+    <license>
+      <name>GNU GENERAL PUBLIC LICENSE - Version 2, June 1991</name>
+      <url>http://www.gnu.org/licenses/gpl-2.0.txt</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  <scm>
+    <connection>scm:git:git://github.com/aadnk/ProtocolLib.git</connection>
+    <developerConnection>scm:git:git@github.com:aadnk/ProtocolLib.git</developerConnection>
+    <url>https://github.com/aadnk/ProtocolLib</url>
+  </scm>
+  <build>
+    <sourceDirectory>src/main/java</sourceDirectory>
+    <testSourceDirectory>src/test/java</testSourceDirectory>
+    <defaultGoal>clean install</defaultGoal>
+    <resources>
+      <resource>
+        <directory>src/main/java</directory>
+        <excludes>
+          <exclude>**/*.java</exclude>
+        </excludes>
+      </resource>
+    </resources>
+    <plugins>
+      <plugin>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>2.0</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <shadedArtifactAttached>false</shadedArtifactAttached>
+              <createDependencyReducedPom>true</createDependencyReducedPom>
+              <relocations>
+                <relocation>
+                  <pattern>net.sf</pattern>
+                  <shadedPattern>com.comphenix.net.sf</shadedPattern>
+                </relocation>
+              </relocations>
+              <artifactSet>
+                <excludes>
+                  <exclude>org.bukkit:craftbukkit</exclude>
+                  <exclude>junit:junit</exclude>
+                </excludes>
+              </artifactSet>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  <profiles>
+    <profile>
+      <id>release-sign-artifacts</id>
+      <build>
+        <plugins>
+          <plugin>
+            <artifactId>maven-source-plugin</artifactId>
+            <version>2.2</version>
+            <executions>
+              <execution>
+                <id>attach-sources</id>
+                <goals>
+                  <goal>jar</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <artifactId>maven-javadoc-plugin</artifactId>
+            <version>2.9</version>
+            <executions>
+              <execution>
+                <id>attach-javadocs</id>
+                <goals>
+                  <goal>jar</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <plugin>
+            <artifactId>maven-gpg-plugin</artifactId>
+            <version>1.4</version>
+            <executions>
+              <execution>
+                <id>sign-artifacts</id>
+                <phase>verify</phase>
+                <goals>
+                  <goal>sign</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+  <repositories>
+    <repository>
+      <id>bukkit-rep</id>
+      <url>http://repo.bukkit.org/content/groups/public</url>
+    </repository>
+  </repositories>
+  <dependencies>
+    <dependency>
+      <groupId>org.bukkit</groupId>
+      <artifactId>craftbukkit</artifactId>
+      <version>1.3.2-R1.0</version>
+      <scope>provided</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.10</version>
+      <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>hamcrest-core</artifactId>
+          <groupId>org.hamcrest</groupId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+  </dependencies>
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+        <version>2.5.2</version>
+        <configuration>
+          <threshold>High</threshold>
+          <effort>Default</effort>
+        </configuration>
+      </plugin>
+    </plugins>
+  </reporting>
+  <distributionManagement>
+    <repository>
+      <id>comphenix-releases</id>
+      <name>Comphenix Maven Releases</name>
+      <url>http://repo.comphenix.net/content/repositories/releases/</url>
+    </repository>
+    <snapshotRepository>
+      <id>comphenix-snapshots</id>
+      <name>Comphenix Maven Snapshots</name>
+      <url>http://repo.comphenix.net/content/repositories/snapshots/</url>
+    </snapshotRepository>
+  </distributionManagement>
+  <properties>
+    <project.build.sourceEncoding>cp1252</project.build.sourceEncoding>
+  </properties>
+</project>
+

ProtocolLib/pom.xml

@@ -0,0 +1,215 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.comphenix.protocol</groupId>
+  <artifactId>ProtocolLib</artifactId>
+  <version>1.4.0</version>
+  <packaging>jar</packaging>
+  <description>Provides read/write access to the Minecraft protocol.</description>
+  
+  <properties>
+    <project.build.sourceEncoding>cp1252</project.build.sourceEncoding>
+  </properties>
+
+  <distributionManagement>
+    <repository>
+      <id>comphenix-releases</id>
+      <name>Comphenix Maven Releases</name>
+      <url>http://repo.comphenix.net/content/repositories/releases/</url>
+    </repository>
+    <snapshotRepository>
+      <id>comphenix-snapshots</id>
+      <name>Comphenix Maven Snapshots</name>
+      <url>http://repo.comphenix.net/content/repositories/snapshots/</url>
+    </snapshotRepository>
+  </distributionManagement>
+ 
+  <repositories>
+    <repository>
+      <id>bukkit-rep</id>
+      <url>http://repo.bukkit.org/content/groups/public</url>
+    </repository>
+  </repositories>
+ 
+  <build>
+    <defaultGoal>clean install</defaultGoal>
+    <sourceDirectory>src/main/java</sourceDirectory>
+    <testSourceDirectory>src/test/java</testSourceDirectory>
+    <resources>
+      <resource>
+        <directory>src/main/java</directory>
+        <excludes>
+          <exclude>**/*.java</exclude>
+        </excludes>
+      </resource>
+    </resources>
+    
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>2.0</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <shadedArtifactAttached>false</shadedArtifactAttached>
+              <createDependencyReducedPom>true</createDependencyReducedPom>
+
+              <relocations>
+                <relocation>
+                  <pattern>net.sf</pattern>
+                  <shadedPattern>com.comphenix.net.sf</shadedPattern>
+                </relocation>
+              </relocations>
+              
+              <artifactSet>
+                <excludes>
+                  <exclude>org.bukkit:craftbukkit</exclude>
+                  <exclude>junit:junit</exclude>
+                </excludes>
+              </artifactSet>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>2.3.2</version>
+        <configuration>
+          <source>1.6</source>
+          <target>1.6</target>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+  
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>findbugs-maven-plugin</artifactId>
+        <version>2.5.2</version>
+          <configuration>
+            <threshold>High</threshold>
+            <effort>Default</effort>
+          </configuration>
+      </plugin>
+    </plugins>
+  </reporting>
+  
+  <profiles>
+  <profile>
+    <id>release-sign-artifacts</id>
+    <activation>
+      <property>
+        <name>performRelease</name>
+        <value>true</value>
+      </property>
+    </activation>
+    <build>
+      <plugins>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-source-plugin</artifactId>
+          <version>2.2</version>
+          <executions>
+            <execution>
+              <id>attach-sources</id>
+              <goals>
+                <goal>jar</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+      
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-javadoc-plugin</artifactId>
+          <version>2.9</version>
+          <executions>
+            <execution>
+              <id>attach-javadocs</id>
+              <goals>
+                <goal>jar</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+      
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-gpg-plugin</artifactId>
+          <version>1.4</version>
+          <executions>
+            <execution>
+              <id>sign-artifacts</id>
+              <phase>verify</phase>
+              <goals>
+                <goal>sign</goal>
+              </goals>
+            </execution>
+          </executions>
+        </plugin>
+        
+      </plugins>
+    </build>
+  </profile>
+  </profiles>
+  
+  <url>http://dev.bukkit.org/server-mods/protocollib/</url>
+  <name>ProtocolLib</name>
+  
+  <scm>
+    <connection>scm:git:git://github.com/aadnk/ProtocolLib.git</connection>
+    <developerConnection>scm:git:git@github.com:aadnk/ProtocolLib.git</developerConnection>
+    <url>https://github.com/aadnk/ProtocolLib</url>
+  </scm>
+  
+  <licenses>
+    <license>
+      <name>GNU GENERAL PUBLIC LICENSE - Version 2, June 1991</name>
+      <url>http://www.gnu.org/licenses/gpl-2.0.txt</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+  
+  <developers>
+    <developer>
+      <id>aadnk</id>
+      <name>Kristian S. Stangeland</name>
+      <email>kr_stang@hotmail.com</email>
+      <url>http://comphenix.net/</url>
+      <roles>
+        <role>developer</role>
+        <role>maintainer</role>
+      </roles>
+      <timezone>1</timezone>
+    </developer>
+  </developers>
+  
+  <dependencies>
+  	<dependency>
+  		<groupId>cglib</groupId>
+  		<artifactId>cglib-nodep</artifactId>
+  		<version>2.2.2</version>
+  		<scope>compile</scope>
+  	</dependency>
+  	<dependency>
+  		<groupId>org.bukkit</groupId>
+  		<artifactId>craftbukkit</artifactId>
+  		<version>1.3.2-R1.0</version>
+  		<scope>provided</scope>
+  	</dependency>
+  	<dependency>
+  		<groupId>junit</groupId>
+  		<artifactId>junit</artifactId>
+  		<version>4.10</version>
+  		<scope>test</scope>
+  	</dependency>
+  </dependencies>
+</project>

ProtocolLib/src/com/comphenix/protocol/Application.java

@@ -1,8 +0,0 @@
-package com.comphenix.protocol;
-
-public class Application {
-	public static void main(String[] args) {
-		// For now, though we might consider making a proper application
-		System.out.println("This is a Bukkit library. Place it in the plugin-folder and restart the server!");
-	}
-}

ProtocolLib/src/com/comphenix/protocol/ProtocolLibrary.java

@@ -1,63 +0,0 @@
-package com.comphenix.protocol;
-
-import java.util.logging.Logger;
-
-import org.bukkit.Server;
-import org.bukkit.plugin.PluginManager;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import com.comphenix.protocol.injector.PacketFilterManager;
-
-public class ProtocolLibrary extends JavaPlugin {
-	
-	// There should only be one protocol manager, so we'll make it static
-	private static PacketFilterManager protocolManager;
-	
-	// Error logger
-	private Logger logger;
-
-	@Override
-	public void onLoad() {
-		logger = getLoggerSafely();
-		protocolManager = new PacketFilterManager(getClassLoader(), logger);
-	}
-	
-	@Override
-	public void onEnable() {
-		Server server = getServer();
-		PluginManager manager = server.getPluginManager();
-		
-		// Player login and logout events
-		protocolManager.registerEvents(manager, this);
-		protocolManager.initializePlayers(server.getOnlinePlayers());
-	}
-		
-	@Override
-	public void onDisable() {
-		protocolManager.close();
-	}
-
-	/**
-	 * Retrieves the packet protocol manager.
-	 * @return Packet protocol manager.
-	 */
-	public static ProtocolManager getProtocolManager() {
-		return protocolManager;
-	}
-	
-	// Get the Bukkit logger first, before we try to create our own
-	private Logger getLoggerSafely() {
-		
-		Logger log = null;
-	
-		try {
-			log = getLogger();
-		} catch (Throwable e) {
-			// We'll handle it
-		}
-		
-		if (log == null)
-			log = Logger.getLogger("Minecraft");
-		return log;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/events/ConnectionSide.java

@@ -1,31 +0,0 @@
-package com.comphenix.protocol.events;
-
-/**
- * Used to set a packet filter.
- * 
- * @author Kristian
- */
-public enum ConnectionSide {
-	/**
-	 * Listen for server side packets that will invoke onPacketSending().
-	 */
-	SERVER_SIDE,
-	
-	/**
-	 * Listen for client side packets that will invoke onPacketReceiving().
-	 */
-	CLIENT_SIDE,
-	
-	/**
-	 * Listen for both client and server side packets.
-	 */
-	BOTH;
-	
-	public boolean isForClient() {
-		return this == CLIENT_SIDE || this == BOTH;
-	}
-	
-	public boolean isForServer() {
-		return this == SERVER_SIDE || this == BOTH;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/events/PacketAdapter.java

@@ -1,60 +0,0 @@
-package com.comphenix.protocol.events;
-
-import java.util.Set;
-
-import org.apache.commons.lang.StringUtils;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import com.google.common.collect.Sets;
-
-/**
- * Represents a packet listener with useful constructors.
- * 
- * @author Kristian
- */
-public abstract class PacketAdapter implements PacketListener {
-	
-	protected JavaPlugin plugin;
-	protected Set<Integer> packetsID;
-	protected ConnectionSide connectionSide;
-	
-	/**
-	 * Initialize a packet listener.
-	 * @param plugin - the plugin that spawned this listener.
-	 * @param connectionSide - the packet type the listener is looking for.
-	 * @param packets - the packet IDs the listener is looking for.
-	 */
-	public PacketAdapter(JavaPlugin plugin, ConnectionSide connectionSide, Integer... packets) {
-		this.plugin = plugin;
-		this.connectionSide = connectionSide;
-		this.packetsID = Sets.newHashSet(packets);
-	}
-	
-	@Override
-	public void onPacketReceiving(PacketEvent event) {
-		// Default is to do nothing
-	}
-	
-	@Override
-	public void onPacketSending(PacketEvent event) {
-		// And here too
-	}
-	
-	@Override
-	public ConnectionSide getConnectionSide() {
-		return connectionSide;
-	}
-	
-	@Override
-	public Set<Integer> getPacketsID() {
-		return packetsID;
-	}
-	
-	@Override
-	public String toString() {
-		// This is used by the error reporter 
-		return String.format("PacketAdapter[plugin=%s, side=%s, packets=%s]", 
-				plugin.getName(), getConnectionSide().name(), 
-				StringUtils.join(packetsID, ", "));
-	}
-}

ProtocolLib/src/com/comphenix/protocol/events/PacketContainer.java

@@ -1,126 +0,0 @@
-package com.comphenix.protocol.events;
-
-import org.apache.commons.lang.NullArgumentException;
-import org.bukkit.craftbukkit.inventory.CraftItemStack;
-import org.bukkit.inventory.ItemStack;
-
-import com.comphenix.protocol.injector.StructureCache;
-import com.comphenix.protocol.reflect.EquivalentConverter;
-import com.comphenix.protocol.reflect.StructureModifier;
-
-import net.minecraft.server.Packet;
-
-/**
- * Represents a Minecraft packet indirectly.
- * 
- * @author Kristian
- */
-public class PacketContainer {
-
-	protected Packet handle;
-	protected int id;
-	
-	// Current structure modifier
-	protected StructureModifier<Object> structureModifier;
-	
-	/**
-	 * Creates a packet container for a new packet.
-	 * @param id - ID of the packet to create.
-	 */
-	public PacketContainer(int id) {
-		this(id, StructureCache.newPacket(id));
-	}
-	
-	/**
-	 * Creates a packet container for an existing packet.
-	 * @param id - ID of the given packet.
-	 * @param handle - contained packet.
-	 */
-	public PacketContainer(int id, Packet handle) {
-		this(id, handle, StructureCache.getStructure(id).withTarget(handle));
-	}
-	
-	/**
-	 * Creates a packet container for an existing packet.
-	 * @param id - ID of the given packet.
-	 * @param handle - contained packet.
-	 * @param structure - structure modifier.
-	 */
-	public PacketContainer(int id, Packet handle, StructureModifier<Object> structure) {
-		if (handle == null)
-			throw new NullArgumentException("handle");
-		
-		this.id = id;
-		this.handle = handle;
-		this.structureModifier = structure;
-	}
-	
-	/**
-	 * Retrieves the underlying Minecraft packet. 
-	 * @return Underlying Minecraft packet.
-	 */
-	public Packet getHandle() {
-		return handle;
-	}
-	
-	/**
-	 * Retrieves the generic structure modifier for this packet.
-	 * @return Structure modifier.
-	 */
-	public StructureModifier<Object> getModifier() {
-		return structureModifier;
-	}
-	
-	public <T> StructureModifier<T> getPrimitiveModifier(Class<T> primitiveType) {
-		return structureModifier.withType(primitiveType);
-	}
-	
-	public StructureModifier<ItemStack> getItemModifier() {
-		// Convert from and to the Bukkit wrapper
-		return structureModifier.<ItemStack>withType(net.minecraft.server.ItemStack.class, new EquivalentConverter<ItemStack>() {
-			public Object getGeneric(ItemStack specific) {
-				return ((CraftItemStack) specific).getHandle();
-			}
-			
-			@Override
-			public ItemStack getSpecific(Object generic) {
-				return new CraftItemStack((net.minecraft.server.ItemStack) generic);
-			}
-		});
-	}
-	
-	public StructureModifier<ItemStack[]> getItemArrayModifier() {
-		// Convert to and from the Bukkit wrapper
-		return structureModifier.<ItemStack[]>withType(net.minecraft.server.ItemStack[].class, new EquivalentConverter<ItemStack[]>() {
-			public Object getGeneric(ItemStack[] specific) {
-				net.minecraft.server.ItemStack[] result = new net.minecraft.server.ItemStack[specific.length];
-				
-				// Unwrap every item
-				for (int i = 0; i < result.length; i++) {
-					result[i] = ((CraftItemStack) specific[i]).getHandle();
-				}
-				return result;
-			}
-			
-			@Override
-			public ItemStack[] getSpecific(Object generic) {
-				net.minecraft.server.ItemStack[] input = (net.minecraft.server.ItemStack[]) generic;
-				ItemStack[] result = new ItemStack[input.length];
-				
-				// Add the wrapper
-				for (int i = 0; i < result.length; i++) {
-					result[i] = new CraftItemStack(input[i]);
-				}
-				return result;
-			}
-		});
-	}
-	
-	/**
-	 * Retrieves the ID of this packet.
-	 * @return Packet ID.
-	 */
-	public int getID() {
-		return id;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/events/PacketEvent.java

@@ -1,119 +0,0 @@
-package com.comphenix.protocol.events;
-
-import java.util.EventObject;
-
-import org.bukkit.entity.Player;
-
-public class PacketEvent extends EventObject {
-	/**
-	 * Automatically generated by Eclipse.
-	 */
-	private static final long serialVersionUID = -5360289379097430620L;
-
-	private PacketContainer packet;
-	private Player sender;
-	private Player reciever;
-	private boolean cancel;
-	
-	/**
-	 * Use the static constructors to create instances of this event.
-	 * @param source - the event source.
-	 */
-	public PacketEvent(Object source) {
-		super(source);
-	}
-
-	private PacketEvent(Object source, PacketContainer packet, Player sender, Player reciever) {
-		super(source);
-		this.packet = packet;
-		this.sender = sender;
-		this.reciever = reciever;
-	}
-
-	/**
-	 * Creates an event representing a client packet transmission.
-	 * @param source - the event source.
-	 * @param packet - the packet.
-	 * @param client - the client that sent the packet.
-	 * @return The event.
-	 */
-	public static PacketEvent fromClient(Object source, PacketContainer packet, Player client) {
-		return new PacketEvent(source, packet, client, null);
-	}
-	
-	/**
-	 * Creates an event representing a server packet transmission.
-	 * @param source - the event source.
-	 * @param packet - the packet.
-	 * @param recipient - the client that will receieve the packet.
-	 * @return The event.
-	 */
-	public static PacketEvent fromServer(Object source,  PacketContainer packet, Player recipient) {
-		return new PacketEvent(source, packet, null, recipient);
-	}
-	
-	/**
-	 * Retrieves the packet that will be sent to the player.
-	 * @return Packet to send to the player.
-	 */
-	public PacketContainer getPacket() {
-		return packet;
-	}
-
-	/**
-	 * Replace the packet that will be sent to the player.
-	 * @param packet - the packet that will be sent instead.
-	 */
-	public void setPacket(PacketContainer packet) {
-		this.packet = packet;
-	}
-
-	/**
-	 * Retrieves the packet ID.
-	 * @return The current packet ID.
-	 */
-	public int getPacketID() {
-		return packet.getID();
-	}
-	
-	/**
-	 * Retrieves whether or not the packet should be cancelled.
-	 * @return TRUE if it should be cancelled, FALSE otherwise.
-	 */
-	public boolean isCancelled() {
-		return cancel;
-	}
-
-	/**
-	 * Sets whether or not the packet should be cancelled.
-	 * @param cancel - TRUE if it should be cancelled, FALSE otherwise.
-	 */
-	public void setCancelled(boolean cancel) {
-		this.cancel = cancel;
-	}
-
-	/**
-	 * Retrieves the player that has sent the packet.
-	 * @return The sender, or NULL if the server is sending the packet.
-	 */
-	public Player getSender() {
-		return sender;
-	}
-	
-	/**
-	 * Retrieves the player that will recieve the packet.
-	 * @return The reciever, or NULL if the server is recieving the packet.
-	 */
-	public Player getReciever() {
-		return reciever;
-	}
-	
-
-	/**
-	 * Whether or not this packet was created by the server.
-	 * @return TRUE if the packet was created by the server, FALSE if it was created by a client.
-	 */
-	public boolean isServerPacket() {
-		return getReciever() != null;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/events/PacketListener.java

@@ -1,34 +0,0 @@
-package com.comphenix.protocol.events;
-
-import java.util.Set;
-
-
-public interface PacketListener {
-	
-	/**
-	 * Invoked right before a packet is transmitted from the server to the client.
-	 * <p>
-	 * Note that the packet may be replaced, if needed.
-	 * 
-	 * @param event - the packet that should be sent.
-	 */
-	public void onPacketSending(PacketEvent event);
-
-	/**
-	 * Invoked right before a recieved packet from a client is being processed.
-	 * @param event - the packet that has been recieved.
-	 */
-	public void onPacketReceiving(PacketEvent event);
-	
-	/**
-	 * Retrieve whether or not we're listening for client or server packets.
-	 * @return The type of packets we expect.
-	 */
-	public ConnectionSide getConnectionSide();
-	
-	/**
-	 * Set of packet ids we expect to recieve.
-	 * @return Packets IDs.
-	 */
-	public Set<Integer> getPacketsID();
-}

ProtocolLib/src/com/comphenix/protocol/injector/MinecraftRegistry.java

@@ -1,88 +0,0 @@
-package com.comphenix.protocol.injector;
-
-import java.lang.reflect.Field;
-import java.util.HashMap;
-import java.util.Map;
-
-import org.apache.commons.lang.ObjectUtils;
-
-import net.minecraft.server.Packet;
-
-import com.comphenix.protocol.reflect.FieldUtils;
-import com.comphenix.protocol.reflect.FuzzyReflection;
-
-/**
- * Static registries in Minecraft.
- * 
- * @author Kristian
- */
-@SuppressWarnings("rawtypes")
-class MinecraftRegistry {
-
-	// The packet class to packet ID translator
-	private static Map<Class, Integer> packetToID;
-	
-	// New proxy values
-	private static Map<Integer, Class> overwrittenPackets = new HashMap<Integer, Class>();
-	
-	// Vanilla packets
-	private static Map<Integer, Class> previousValues = new HashMap<Integer, Class>();
-	
-	@SuppressWarnings({ "unchecked" })
-	public static Map<Class, Integer> getPacketToID() {
-		// Initialize it, if we haven't already
-		if (packetToID == null) {
-			try {
-				Field packetsField = FuzzyReflection.fromClass(Packet.class, true).getFieldByType("java\\.util\\.Map");
-				packetToID = (Map<Class, Integer>) FieldUtils.readStaticField(packetsField, true);
-				
-			} catch (IllegalAccessException e) {
-				throw new RuntimeException("Unable to retrieve the packetClassToIdMap", e);
-			}
-		}
-		
-		return packetToID;
-	}
-	
-	public static Map<Integer, Class> getOverwrittenPackets() {
-		return overwrittenPackets;
-	}
-	
-	public static Map<Integer, Class> getPreviousPackets() {
-		return previousValues;
-	}
-	
-	/**
-	 * Retrieves the correct packet class from a given packet ID.
-	 * @param packetID - the packet ID.
-	 * @return The associated class.
-	 */
-	public static Class getPacketClassFromID(int packetID) {
-		return getPacketClassFromID(packetID, false);
-	}
-	
-	/**
-	 * Retrieves the correct packet class from a given packet ID.
-	 * @param packetID - the packet ID.
- 	 * @param vanilla - whether or not to look for vanilla classes, not injected classes.
-	 * @return The associated class.
-	 */
-	public static Class getPacketClassFromID(int packetID, boolean forceVanilla) {
-		
-		Map<Integer, Class> lookup = forceVanilla ? previousValues : overwrittenPackets;
-		
-		// Optimized lookup
-		if (lookup.containsKey(packetToID)) {
-			return lookup.get(packetToID);
-		}
-
-		// Will most likely not be used
-		for (Map.Entry<Class, Integer> entry : getPacketToID().entrySet()) {
-			if (ObjectUtils.equals(entry.getValue(), packetID)) {
-				return entry.getKey();
-			}
-		}
-		
-		throw new IllegalArgumentException("The packet ID " + packetID + " is not registered.");
-	}
-}

ProtocolLib/src/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -1,336 +0,0 @@
-package com.comphenix.protocol.injector;
-
-import java.io.DataInputStream;
-import java.lang.reflect.InvocationTargetException;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Map;
-import java.util.Set;
-import java.util.concurrent.CopyOnWriteArraySet;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-import net.minecraft.server.Packet;
-
-import org.apache.commons.lang.NullArgumentException;
-import org.bukkit.entity.Player;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.EventPriority;
-import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerJoinEvent;
-import org.bukkit.event.player.PlayerQuitEvent;
-import org.bukkit.plugin.Plugin;
-import org.bukkit.plugin.PluginManager;
-
-import com.comphenix.protocol.ProtocolManager;
-import com.comphenix.protocol.events.ConnectionSide;
-import com.comphenix.protocol.events.PacketContainer;
-import com.comphenix.protocol.events.PacketEvent;
-import com.comphenix.protocol.events.PacketListener;
-import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Sets;
-
-public final class PacketFilterManager implements ProtocolManager {
-
-	private Set<PacketListener> packetListeners = new CopyOnWriteArraySet<PacketListener>();
-	
-	// Player injection
-	private Map<DataInputStream, Player> connectionLookup = new HashMap<DataInputStream, Player>();
-	private Map<Player, PlayerInjector> playerInjection = new HashMap<Player, PlayerInjector>();
-	
-	// Packet injection
-	private PacketInjector packetInjector;
-	
-	// Enabled packet filters
-	private Set<Integer> packetFilters = new HashSet<Integer>();
-	
-	// Whether or not this class has been closed
-	private boolean hasClosed;
-	
-	// Error logger
-	private Logger logger;
-	
-	/**
-	 * Only create instances of this class if protocol lib is disabled.
-	 */
-	public PacketFilterManager(ClassLoader classLoader, Logger logger) {
-		if (logger == null)
-			throw new NullArgumentException("logger");
-		if (classLoader == null)
-			throw new NullArgumentException("classLoader");
-		
-		try {
-			// Initialize values
-			this.logger = logger;
-			this.packetInjector = new PacketInjector(classLoader, this, connectionLookup);
-		} catch (IllegalAccessException e) {
-			logger.log(Level.SEVERE, "Unable to initialize packet injector.", e);
-		}
-	}
-	
-	public Logger getLogger() {
-		return logger;
-	}
-	
-	@Override
-	public ImmutableSet<PacketListener> getPacketListeners() {
-		return ImmutableSet.copyOf(packetListeners);
-	}
-
-	@Override
-	public void addPacketListener(PacketListener listener) {
-		if (listener == null)
-			throw new NullArgumentException("listener");
-		
-		packetListeners.add(listener);
-		enablePacketFilters(listener.getConnectionSide(), 
-							listener.getPacketsID());
-	}
-	
-	@Override
-	public void removePacketListener(PacketListener listener) {
-		if (listener == null)
-			throw new NullArgumentException("listener");
-		
-		packetListeners.remove(listener);
-		disablePacketFilters(listener.getConnectionSide(),
-						 	 listener.getPacketsID());
-	}
-	
-	/**
-	 * Invokes the given packet event for every registered listener.
-	 * @param event - the packet event to invoke.
-	 */
-	public void invokePacketRecieving(PacketEvent event) {
-		for (PacketListener listener : packetListeners) {
-			try {
-				if (canHandlePacket(listener, event))
-					listener.onPacketReceiving(event);
-			} catch (Exception e) {
-				// Minecraft doesn't want your Exception.
-				logger.log(Level.SEVERE, "Exception occured in onPacketReceiving() for " + listener.toString(), e);
-			}
-		}	
-	}
-	
-	/**
-	 * Invokes the given packet event for every registered listener.
-	 * @param event - the packet event to invoke.
-	 */
-	public void invokePacketSending(PacketEvent event) {
-		for (PacketListener listener : packetListeners) {
-			try {
-				if (canHandlePacket(listener, event))
-					listener.onPacketSending(event);
-			} catch (Exception e) {
-				logger.log(Level.SEVERE, "Exception occured in onPacketReceiving() for " + listener.toString(), e);
-			}
-		}	
-	}
-	
-	private boolean canHandlePacket(PacketListener listener, PacketEvent event) {
-		// Make sure the listener is looking for this packet
-		if (!listener.getPacketsID().contains(event.getPacket().getID()))
-			return false;
-		
-		// And this type of packet
-		if (event.isServerPacket())
-			return listener.getConnectionSide().isForServer();
-		else
-			return listener.getConnectionSide().isForClient();
-	}
-	
-	/**
-	 * Enables packet events for a given packet ID.
-	 * <p>
-	 * Note that all packets are disabled by default.
-	 * 
-	 * @param side - which side the event will arrive from.
-	 * @param packets - the packet id(s).
-	 */
-	private void enablePacketFilters(ConnectionSide side, Set<Integer> packets) {
-		if (side == null)
-			throw new NullArgumentException("side");
-		
-		for (int packetID : packets) {
-			if (side.isForServer())
-				packetFilters.add(packetID);
-			if (side.isForClient() && packetInjector != null)
-				packetInjector.addPacketHandler(packetID);
-		}
-	}
-
-	/**
-	 * Disables packet events from a given packet ID.
-	 * @param packets - the packet id(s).
-	 * @param side - which side the event no longer should arrive from.
-	 */
-	private void disablePacketFilters(ConnectionSide side, Set<Integer> packets) {
-		if (side == null)
-			throw new NullArgumentException("side");
-		
-		for (int packetID : packets) {
-			if (side.isForServer())
-				packetFilters.remove(packetID);
-			if (side.isForClient() && packetInjector != null) 
-				packetInjector.removePacketHandler(packetID);
-		}
-	}
-	
-	@Override
-	public void sendServerPacket(Player reciever, PacketContainer packet) throws InvocationTargetException {
-		sendServerPacket(reciever, packet, true);
-	}
-	
-	@Override
-	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters) throws InvocationTargetException {
-		if (reciever == null)
-			throw new NullArgumentException("reciever");
-		if (packet == null)
-			throw new NullArgumentException("packet");
-		
-		getInjector(reciever).sendServerPacket(packet.getHandle(), filters);
-	}
-
-	@Override
-	public void recieveClientPacket(Player sender, PacketContainer packet) throws IllegalAccessException, InvocationTargetException {
-		recieveClientPacket(sender, packet, true);
-	}
-	
-	@Override
-	public void recieveClientPacket(Player sender, PacketContainer packet, boolean filters) throws IllegalAccessException, InvocationTargetException {
-		
-		if (sender == null)
-			throw new NullArgumentException("sender");
-		if (packet == null)
-			throw new NullArgumentException("packet");
-		
-		PlayerInjector injector = getInjector(sender);
-		Packet mcPacket = packet.getHandle();
-		
-		if (filters) {
-			mcPacket = injector.handlePacketRecieved(mcPacket);
-		}
-		
-		injector.processPacket(mcPacket);
-	}
-	
-	@Override
-	public PacketContainer createPacket(int id) {
-		return new PacketContainer(id);
-	}
-	
-	@Override
-	public Set<Integer> getPacketFilters() {
-		if (packetInjector != null)
-			return Sets.union(packetFilters, packetInjector.getPacketHandlers());
-		else
-			return packetFilters;
-	}
-	
-	/**
-	 * Initialize the packet injection for every player.
-	 * @param players - list of players to inject. 
-	 */
-	public void initializePlayers(Player[] players) {
-		for (Player player : players)
-			injectPlayer(player);
-	}
-	
-	private void injectPlayer(Player player) {
-		// Don't inject if the class has closed
-		if (!hasClosed && player != null && !playerInjection.containsKey(player)) {
-			try {
-				PlayerInjector injector = new PlayerInjector(player, this, packetFilters);
-				
-				injector.injectManager();
-				playerInjection.put(player, injector);
-				connectionLookup.put(injector.getInputStream(false), player);
-				
-			} catch (IllegalAccessException e) {
-				// Mark this injection attempt as a failure
-				playerInjection.put(player, null);
-				logger.log(Level.SEVERE, "Unable to access fields.", e);
-			}
-		}
-	}
-	
-	/**
-	 * Register this protocol manager on Bukkit.
-	 * @param manager - Bukkit plugin manager that provides player join/leave events.
-	 * @param plugin - the parent plugin.
-	 */
-	public void registerEvents(PluginManager manager, Plugin plugin) {
-		manager.registerEvents(new Listener() {
-			
-			@EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
-		    public void onPlayerJoin(PlayerJoinEvent event) {
-				injectPlayer(event.getPlayer());
-		    }
-			
-			@EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
-		    public void onPlayerQuit(PlayerQuitEvent event) {
-				uninjectPlayer(event.getPlayer());
-		    }
-		}, plugin);
-	}
-	
-	private void uninjectPlayer(Player player) {
-		if (!hasClosed && player != null) {
-			
-			PlayerInjector injector = playerInjection.get(player);
-			DataInputStream input = injector.getInputStream(true);
-			
-			if (injector != null) {
-				injector.cleanupAll();
-				
-				playerInjection.remove(injector);
-				connectionLookup.remove(input);
-			}
-		}	
-	}
-	
-	private PlayerInjector getInjector(Player player) {
-		if (!playerInjection.containsKey(player)) {
-			// What? Try to inject again.
-			injectPlayer(player);
-		}
-		
-		PlayerInjector injector = playerInjection.get(player);
-		
-		// Check that the injector was sucessfully added
-		if (injector != null)
-			return injector;
-		else
-			throw new IllegalArgumentException("Player has no injected handler.");
-	}
-	
-	@Override
-	public boolean isClosed() {
-		return hasClosed;
-	}
-	
-	public void close() {
-		// Guard
-		if (hasClosed)
-			return;
-		
-		// Remove everything
-		for (PlayerInjector injection : playerInjection.values()) {
-			injection.cleanupAll();
-		}
-		
-		// Remove packet handlers
-		if (packetInjector != null)
-			packetInjector.cleanupAll();
-		
-		playerInjection.clear();
-		connectionLookup.clear();
-		hasClosed = true;
-	}
-	
-	@Override
-	protected void finalize() throws Throwable {
-		close();
-	}
-}

ProtocolLib/src/com/comphenix/protocol/injector/PlayerInjector.java

@@ -1,261 +0,0 @@
-package com.comphenix.protocol.injector;
-
-import java.io.DataInputStream;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationHandler;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Proxy;
-import java.util.Set;
-
-import net.minecraft.server.EntityPlayer;
-import net.minecraft.server.Packet;
-
-import org.bukkit.craftbukkit.entity.CraftPlayer;
-import org.bukkit.entity.Player;
-
-import com.comphenix.protocol.events.PacketContainer;
-import com.comphenix.protocol.events.PacketEvent;
-import com.comphenix.protocol.reflect.FieldUtils;
-import com.comphenix.protocol.reflect.FuzzyReflection;
-import com.comphenix.protocol.reflect.VolatileField;
-
-class PlayerInjector {
-
-	// Cache previously retrieved fields
-	private static Field serverHandlerField;
-	private static Field networkManagerField;
-	private static Field inputField;
-	private static Field netHandlerField;
-	
-	// And methods
-	private static Method queueMethod;
-	private static Method processMethod;
-		
-	private Player player;
-	private boolean hasInitialized;
-
-	// Reference to the player's network manager
-	private VolatileField networkManager;
-	
-	// The packet manager and filters
-	private PacketFilterManager manager;
-	private Set<Integer> packetFilters;
-	
-	// Previous data input
-	private DataInputStream cachedInput;
-	
-	// Current net handler
-	private Object netHandler;
-
-	public PlayerInjector(Player player, PacketFilterManager manager, Set<Integer> packetFilters) throws IllegalAccessException {
-		this.player = player;
-		this.manager = manager;
-		this.packetFilters = packetFilters;
-		initialize();
-	}
-
-	private void initialize() throws IllegalAccessException {
-	
-		CraftPlayer craft = (CraftPlayer) player;
-		EntityPlayer notchEntity = craft.getHandle();
-		
-		if (!hasInitialized) {
-			// Do this first, in case we encounter an exception
-			hasInitialized = true;
-			
-			// Retrieve the server handler
-			if (serverHandlerField == null)
-				serverHandlerField = FuzzyReflection.fromObject(notchEntity).getFieldByType(".*NetServerHandler");
-			Object serverHandler = FieldUtils.readField(serverHandlerField, notchEntity);
-			
-			// Next, get the network manager 
-			if (networkManagerField == null)
-				networkManagerField = FuzzyReflection.fromObject(serverHandler).getFieldByType(".*NetworkManager");
-			networkManager = new VolatileField(networkManagerField, serverHandler);
-			
-			// And the queue method
-			if (queueMethod == null)
-				queueMethod = FuzzyReflection.fromClass(networkManagerField.getType()).
-								getMethodByParameters("queue", Packet.class );
-			
-			// And the data input stream that we'll use to identify a player
-			if (inputField == null)
-				inputField = FuzzyReflection.fromObject(networkManager.getOldValue(), true).
-								getFieldByType("java\\.io\\.DataInputStream");
-		}
-	}
-	
-	/**
-	 * Retrieves the current net handler for this player.
-	 * @return Current net handler.
-	 * @throws IllegalAccessException Unable to find or retrieve net handler.
-	 */
-	private Object getNetHandler() throws IllegalAccessException {
-		
-		// What a mess
-		try {
-			if (netHandlerField == null)
-				netHandlerField = FuzzyReflection.fromClass(networkManagerField.getType(), true).
-									getFieldByType("net\\.minecraft\\.NetHandler");
-		} catch (RuntimeException e1) {
-			try {
-				// Well, that sucks. Try just Minecraft objects then.
-				netHandlerField = FuzzyReflection.fromClass(networkManagerField.getType(), true).
-									 getFieldByType(FuzzyReflection.MINECRAFT_OBJECT);
-				
-			} catch (RuntimeException e2) {
-				return new IllegalAccessException("Cannot locate net handler. " + e2.getMessage());
-			}
-		}
-		
-		// Get the handler
-		if (netHandler != null)
-			netHandler = FieldUtils.readField(netHandlerField, networkManager.getOldValue(), true);
-		return netHandler;
-	}
-	
-	/**
-	 * Processes the given packet as if it was transmitted by the current player.
-	 * @param packet - packet to process.
-	 * @throws IllegalAccessException If the reflection machinery failed.
-	 * @throws InvocationTargetException If the underlying method caused an error.
-	 */
-	public void processPacket(Packet packet) throws IllegalAccessException, InvocationTargetException {
-		
-		Object netHandler = getNetHandler();
-		
-		// Get the process method
-		if (processMethod == null) {
-			try {
-				processMethod = FuzzyReflection.fromClass(Packet.class).
-						getMethodByParameters("processPacket", netHandlerField.getType());
-			} catch (RuntimeException e) {
-				throw new IllegalArgumentException("Cannot locate process packet method: " + e.getMessage());
-			}
-		}
-	
-		// We're ready
-		try {
-			processMethod.invoke(packet, netHandler);
-		} catch (IllegalArgumentException e) {
-			throw new IllegalArgumentException("Method " + processMethod.getName() + " is not compatible.");
-		} catch (InvocationTargetException e) {
-			throw e;
-		}
-	}
-	
-	/**
-	 * Send a packet to the client.
-	 * @param packet - server packet to send.
-	 * @param filtered - whether or not the packet will be filtered by our listeners.
-	 * @param InvocationTargetException If an error occured when sending the packet.
-	 */
-	public void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException {
-		Object networkDelegate = filtered ? networkManager.getValue() : networkManager.getOldValue();
-		
-		if (networkDelegate != null) {
-			try {
-				// Note that invocation target exception is a wrapper for a checked exception
-				queueMethod.invoke(networkDelegate, packet);
-				
-			} catch (IllegalArgumentException e) {
-				throw e;
-			} catch (InvocationTargetException e) {
-				throw e;
-			} catch (IllegalAccessException e) {
-				throw new IllegalStateException("Unable to access queue method.", e);
-			}
-		} else {
-			throw new IllegalStateException("Unable to load network mananager. Cannot send packet.");
-		}
-	}
-	
-	public void injectManager() {
-		
-		if (networkManager != null) {
-			final Class<?> networkInterface = networkManagerField.getType();
-			final Object networkDelegate = networkManager.getOldValue();
-			
-			// Create our proxy object
-			Object networkProxy = Proxy.newProxyInstance(networkInterface.getClassLoader(), 
-					new Class<?>[] { networkInterface }, new InvocationHandler() {
-				
-				@Override
-				public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
-					// OH OH! The queue method!
-					if (method.equals(queueMethod)) {
-						Packet packet = (Packet) args[0];
-						
-						if (packet != null) {
-							packet = handlePacketRecieved(packet);
-							
-							// A NULL packet indicate cancelling
-							if (packet != null)
-								args[0] = packet;
-							else
-								return null;
-						}
-					}
-					
-					// Delegate to our underlying class
-					try {
-						return method.invoke(networkDelegate, args);
-					} catch (InvocationTargetException e) {
-						throw e.getCause();
-					}
-				}
-			});
-		
-			// Inject it, if we can.
-			networkManager.setValue(networkProxy);
-		}
-	}
-	
-	/**
-	 * Allows a packet to be recieved by the listeners.
-	 * @param packet - packet to recieve.
-	 * @return The given packet, or the packet replaced by the listeners.
-	 */
-	Packet handlePacketRecieved(Packet packet) {
-		// Get the packet ID too
-		Integer id = MinecraftRegistry.getPacketToID().get(packet.getClass());
-
-		// Make sure we're listening
-		if (packetFilters.contains(id)) {	
-			// A packet has been sent guys!
-			PacketContainer container = new PacketContainer(id, packet);
-			PacketEvent event = PacketEvent.fromServer(manager, container, player);
-			manager.invokePacketSending(event);
-			
-			// Cancelling is pretty simple. Just ignore the packet.
-			if (event.isCancelled())
-				return null;
-			
-			// Right, remember to replace the packet again
-			return event.getPacket().getHandle();
-		}
-		
-		return packet;
-	}
-	
-	public DataInputStream getInputStream(boolean cache) {
-		// Get the associated input stream
-		try {
-			if (cache && cachedInput != null)
-				return cachedInput;
-			
-			// Save to cache
-			cachedInput = (DataInputStream) FieldUtils.readField(inputField, networkManager.getOldValue(), true);
-			return cachedInput;
-			
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Unable to read input stream.", e);
-		}
-	}
-	
-	public void cleanupAll() {
-		// Clean up
-		networkManager.revertValue();
-	}
-}

ProtocolLib/src/com/comphenix/protocol/injector/StructureCache.java

@@ -1,46 +0,0 @@
-package com.comphenix.protocol.injector;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import net.minecraft.server.Packet;
-
-import com.comphenix.protocol.reflect.StructureModifier;
-
-public class StructureCache {
-	// Structure modifiers
-	private static Map<Integer, StructureModifier<Object>> structureModifiers = new HashMap<Integer, StructureModifier<Object>>();
-	
-	/**
-	 * Creates an empty Minecraft packet of the given ID.
-	 * @param id - packet ID.
-	 * @return Created packet.
-	 */
-	public static Packet newPacket(int id) {
-		try {
-			return (Packet) MinecraftRegistry.getPacketClassFromID(id, true).newInstance();
-		} catch (InstantiationException e) {
-			return null;
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Access denied.", e);
-		}
-	}
-	
-	/**
-	 * Retrieve a cached structure modifier for the given packet id.
-	 * @param id - packet ID.
-	 * @return A structure modifier.
-	 */
-	public static StructureModifier<Object> getStructure(int id) {
-		
-		StructureModifier<Object> result = structureModifiers.get(id);
-		
-		// Use the vanilla class definition
-		if (result == null) {
-			result = new StructureModifier<Object>(MinecraftRegistry.getPacketClassFromID(id, true));
-			structureModifiers.put(id, result);
-		}
-		
-		return result;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/reflect/EquivalentConverter.java

@@ -1,12 +0,0 @@
-package com.comphenix.protocol.reflect;
-
-/**
- * Interface that converts generic objects into types and back.
- * 
- * @author Kristian
- * @param <TType> The specific type.
- */
-public interface EquivalentConverter<TType> {
-	public TType getSpecific(Object generic);
-	public Object getGeneric(TType specific);
-}

ProtocolLib/src/com/comphenix/protocol/reflect/FuzzyReflection.java

@@ -1,218 +0,0 @@
-package com.comphenix.protocol.reflect;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.util.LinkedHashSet;
-import java.util.Set;
-import java.util.regex.Pattern;
-
-import org.apache.commons.lang.ArrayUtils;
-
-/**
- * Retrieves fields and methods by signature, not just name.
- * 
- * @author Kristian
- */
-public class FuzzyReflection {
-
-	/**
-	 * Matches a Minecraft object.
-	 */
-	public static String MINECRAFT_OBJECT = "net\\.minecraft(\\.\\w+)+";
-	
-	// The class we're actually representing
-	private Class<?> source;
-
-	// Whether or not to lookup private members
-	private boolean forceAccess;
-
-	public FuzzyReflection(Class<?> source, boolean forceAccess) {
-		this.source = source;
-		this.forceAccess = forceAccess;
-	}
-	
-	/**
-	 * Retrieves a fuzzy reflection instance from a given class.
-	 * @param source - the class we'll use.
-	 * @return A fuzzy reflection instance.
-	 */
-	public static FuzzyReflection fromClass(Class<?> source) {
-		return fromClass(source, false);
-	}
-	
-	/**
-	 * Retrieves a fuzzy reflection instance from a given class.
-	 * @param source - the class we'll use.
-	 * @param forceAccess - whether or not to override scope restrictions.
-	 * @return A fuzzy reflection instance.
-	 */
-	public static FuzzyReflection fromClass(Class<?> source, boolean forceAccess) {
-		return new FuzzyReflection(source, forceAccess);
-	}
-	
-	/**
-	 * Retrieves a fuzzy reflection instance from an object.
-	 * @param reference - the object we'll use.
-	 * @return A fuzzy reflection instance that uses the class of the given object.
-	 */
-	public static FuzzyReflection fromObject(Object reference) {
-		return new FuzzyReflection(reference.getClass(), false);
-	}
-	
-	/**
-	 * Retrieves a fuzzy reflection instance from an object.
-	 * @param reference - the object we'll use.
-	 * @param forceAccess - whether or not to override scope restrictions.
-	 * @return A fuzzy reflection instance that uses the class of the given object.
-	 */
-	public static FuzzyReflection fromObject(Object reference, boolean forceAccess) {
-		return new FuzzyReflection(reference.getClass(), forceAccess);
-	}
-	
-	/**
-	 * Retrieves the underlying class.
-	 */
-	public Class<?> getSource() {
-		return source;
-	}
-	
-	/**
-	 * Retrieves a method by looking at its name.
-	 * @param nameRegex -  regular expression that will match method names.
-	 * @return The first method that satisfies the regular expression.
-	 */
-	public Method getMethodByName(String nameRegex) {
-		
-		Pattern match = Pattern.compile(nameRegex);
-		
-		for (Method method : getMethods()) {
-			if (match.matcher(method.getName()).matches()) {
-				// Right - this is probably it. 
-				return method;
-			}
-		}
-
-		throw new RuntimeException("Unable to find a method with the pattern " + 
-									nameRegex + " in " + source.getName());
-	}
-	
-	/**
-	 * Retrieves a method by looking at the parameter types only.
-	 * @param name - potential name of the method. Only used by the error mechanism.
-	 * @param args - parameter types of the method to find.
-	 * @return The first method that satisfies the parameter types.
-	 */
-	public Method getMethodByParameters(String name, Class<?>... args) {
-		
-		// Find the correct method to call
-		for (Method method : getMethods()) {
-			if (ArrayUtils.isEquals(method.getParameterTypes(), args)) {
-				return method;
-			}
-		}
-		
-		// That sucks
-		throw new RuntimeException("Unable to find " + name + " in " + source.getName());
-	}
-	
-	/**
-	 * Retrieves a field by name.
-	 * @param nameRegex - regular expression that will match a field name.
-	 * @return The first field to match the given expression.
-	 */
-	public Field getFieldByName(String nameRegex) {
-		
-		Pattern match = Pattern.compile(nameRegex);
-		
-		for (Field field : getFields()) {
-			if (match.matcher(field.getName()).matches()) {
-				// Right - this is probably it. 
-				return field;
-			}
-		}
-		
-		// Looks like we're outdated. Too bad.
-		throw new RuntimeException("Unable to find a field with the pattern " + 
-									nameRegex + " in " + source.getName());
-	}
-	
-	/**
-	 * Retrieves a field by type.
-	 * <p>
-	 * Note that the type is matched using the full canonical representation, i.e.: 
-	 * <ul>
-	 *     <li>java.util.List</li>
-	 *     <li>net.comphenix.xp.ExperienceMod</li>
-	 * </ul>
-	 * @param typeRegex - regular expression that will match the field type.
-	 * @return The first field with a type that matches the given regular expression.
-	 */
-	public Field getFieldByType(String typeRegex) {
-		
-		Pattern match = Pattern.compile(typeRegex);
-		
-		// Like above, only here we test the field type
-		for (Field field : getFields()) {
-			if (match.matcher(field.getType().getName()).matches()) {
-				return field;
-			}
-		}
-		
-		// Looks like we're outdated. Too bad.
-		throw new RuntimeException("Unable to find a field with the type " + 
-									typeRegex + " in " + source.getName());
-	}
-	
-	/**
-	 * Retrieves all private and public fields in declared order (after JDK 1.5).
-	 * @return Every field.
-	 */
-	public Set<Field> getFields() {
-		// We will only consider private fields in the declared class
-		if (forceAccess)
-			return setUnion(source.getDeclaredFields(), source.getFields());
-		else
-			return setUnion(source.getFields());
-	}
-	
-	/**
-	 * Retrieves all private and public methods in declared order (after JDK 1.5).
-	 * @return Every method.
-	 */
-	public Set<Method> getMethods() {
-		// We will only consider private methods in the declared class
-		if (forceAccess)
-			return setUnion(source.getDeclaredMethods(), source.getMethods());
-		else
-			return setUnion(source.getMethods());
-	}
-	
-	// Prevent duplicate fields
-	private static <T> Set<T> setUnion(T[]... array) {
-		Set<T> result = new LinkedHashSet<T>();
-		
-		for (T[] elements : array) {
-			for (T element : elements) {
-				result.add(element);
-			}
-		}
-		
-		return result;
-	}
-	
-	/**
-	 * Retrieves whether or not not to override any scope restrictions.
-	 * @return TRUE if we override scope, FALSE otherwise.
-	 */
-	public boolean isForceAccess() {
-		return forceAccess;
-	}
-
-	/**
-	 * Sets whether or not not to override any scope restrictions.
-	 * @param forceAccess - TRUE if we override scope, FALSE otherwise.
-	 */
-	public void setForceAccess(boolean forceAccess) {
-		this.forceAccess = forceAccess;
-	}
-}

ProtocolLib/src/com/comphenix/protocol/reflect/StructureModifier.java

@@ -1,218 +0,0 @@
-package com.comphenix.protocol.reflect;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import com.google.common.base.Function;
-
-import net.minecraft.server.Packet;
-
-@SuppressWarnings("rawtypes")
-public class StructureModifier<TField> {
-
-	// Object and its type
-	private Class targetType;
-	private Object target;
-	
-	// Converter. May be NULL.
-	private EquivalentConverter<TField> converter;
-	
-	// The fields to read in order
-	private Class fieldType;
-	private List<Field> data = new ArrayList<Field>();
-	
-	// Cache of previous types
-	private Map<Class, StructureModifier> subtypeCache;
-	
-	public StructureModifier(Class targetType) {
-		this(targetType, Object.class, getFields(targetType), null, new HashMap<Class, StructureModifier>());
-	}
-	
-	private StructureModifier(Class targetType, Class fieldType, List<Field> data, 
-							  EquivalentConverter<TField> converter, Map<Class, StructureModifier> subTypeCache) {
-		this.targetType = targetType;
-		this.fieldType = fieldType;
-		this.data = data;
-		this.converter = converter;
-		this.subtypeCache = subTypeCache;
-	}
-	
-	private StructureModifier(StructureModifier<TField> other, Object target) {
-		this(other.targetType, other.fieldType, other.data, other.converter, other.subtypeCache);
-		this.target = target;
-	}
-	
-	/**
-	 * Reads the value of a field given its index.
-	 * @param fieldIndex - index of the field.
-	 * @return Value of the field.
-	 * @throws IllegalAccessException If we're unable to read the field due to a security limitation.
-	 */
-	@SuppressWarnings("unchecked")
-	public TField read(int fieldIndex) throws IllegalAccessException {
-		if (fieldIndex < 0 || fieldIndex >= data.size())
-			throw new IllegalArgumentException("Field index must be within 0 - count");
-		if (target == null)
-			throw new IllegalStateException("Cannot read from a NULL target.");
-		
-		Object result = FieldUtils.readField(data.get(fieldIndex), target, true);
-		
-		// Use the converter, if we have it
-		if (converter != null)
-			return converter.getSpecific(result);
-		else
-			return (TField) result;
-	}
-	
-	/**
-	 * Writes the value of a field given its index.
-	 * @param fieldIndex - index of the field.
-	 * @param value - new value of the field.
-	 * @return This structure modifier - for chaining.
-	 * @throws IllegalAccessException If we're unable to write to the field due to a security limitation.
-	 */
-	public StructureModifier<TField> write(int fieldIndex, TField value) throws IllegalAccessException {
-		if (fieldIndex < 0 || fieldIndex >= data.size())
-			throw new IllegalArgumentException("Field index must be within 0 - count");
-		if (target == null)
-			throw new IllegalStateException("Cannot write to a NULL target.");
-		
-		// Use the converter, if it exists
-		Object obj = converter != null ? converter.getGeneric(value) : value;
-		FieldUtils.writeField(data.get(fieldIndex), target, obj, true);
-		
-		// Make this method chainable
-		return this;
-	}
-	
-	/**
-	 * Correctly modifies the value of a field.
-	 * @param fieldIndex - index of the field to modify.
-	 * @param select - the function that modifies the field value.
-	 * @return This structure modifier - for chaining.
-	 * @throws IllegalAccessException
-	 */
-	public StructureModifier<TField> modify(int fieldIndex, Function<TField, TField> select) throws IllegalAccessException {
-		TField value = read(fieldIndex);
-		return write(fieldIndex, select.apply(value));
-	}
-	
-	/**
-	 * Retrieves a structure modifier that only reads and writes fields of a given type.
-	 * @param fieldType - the type, or supertype, of every field to modify.
-	 * @return A structure modifier for fields of this type.
-	 */
-	public <T> StructureModifier<T> withType(Class fieldType) {
-		return withType(fieldType, null);
-	}
-	
-	/**
-	 * Retrieves a structure modifier that only reads and writes fields of a given type.
-	 * @param fieldType - the type, or supertype, of every field to modify.
-	 * @param converter - converts objects into the given type.
-	 * @return A structure modifier for fields of this type.
-	 */
-	@SuppressWarnings("unchecked")
-	public <T> StructureModifier<T> withType(Class fieldType, EquivalentConverter<T> converter) {
-		
-		StructureModifier<T> result = subtypeCache.get(fieldType);
-		
-		if (fieldType.equals(this.fieldType)) {
-			
-			// We're dealing with the exact field type.
-			return withConverter(converter);
-			
-		} else if (result == null) {
-			List<Field> filtered = new ArrayList<Field>();
-			
-			for (Field field : data) {
-				if (fieldType.isAssignableFrom(field.getType())) {
-					filtered.add(field);
-				}
-			}
-			
-			// Cache structure modifiers
-			result = new StructureModifier<T>(targetType, fieldType, filtered, 
-											  converter, new HashMap<Class, StructureModifier>());
-			subtypeCache.put(fieldType, result);
-		}
-		
-		// Add the target too
-		return result.withTarget(target);
-	}
-	
-	/**
-	 * Retrieves the common type of each field.
-	 * @return Common type of each field.
-	 */
-	public Class getFieldType() {
-		return fieldType;
-	}
-	
-	/**
-	 * Retrieves the type of the object we're modifying.
-	 * @return Type of the object.
-	 */
-	public Class getTargetType() {
-		return targetType;
-	}
-	
-	/**
-	 * Retrieves the object we're currently modifying.
-	 * @return Object we're modifying.
-	 */
-	public Object getTarget() {
-		return target;
-	}
-	
-	/**
-	 * Retrieve the number of readable types.
-	 * @return Readable types.
-	 */
-	public int size() {
-		return data.size();
-	}
-	
-	/**
-	 * Retrieves a structure modifier of the same type for a different object target.
-	 * @param target - different target of the same type.
-	 * @return Structure modifier with the new target.
-	 */
-	public StructureModifier<TField> withTarget(Object target) {
-		return new StructureModifier<TField>(this, target);
-	}
-	
-	/**
-	 * Retrieves a structure modifier with the same type and target, but using a new object converter.
-	 * @param converter- the object converter to use.
-	 * @return Structure modifier with the new converter.
-	 */
-	@SuppressWarnings("unchecked")
-	private <T> StructureModifier<T> withConverter(EquivalentConverter<T> converter) {
-		StructureModifier copy = new StructureModifier(this, target);
-		
-		copy.converter = converter;
-		return copy;
-	}
-	
-	// Used to filter out irrelevant fields
-	private static List<Field> getFields(Class type) {
-		List<Field> result = new ArrayList<Field>();
-		
-		// Retrieve every private and public field
-		for (Field field : FuzzyReflection.fromClass(type, true).getFields()) {
-			int mod = field.getModifiers();
-			
-			// Ignore static, final and "abstract packet" fields
-			if (!Modifier.isFinal(mod) && !Modifier.isStatic(mod) && !field.getDeclaringClass().equals(Packet.class)) {
-				result.add(field);
-			}
-		}
-		
-		return result;
-	}
-}

ProtocolLib/src/main/java/com/comphenix/protocol/Application.java

@@ -0,0 +1,30 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+/**
+ * Ignore this class.
+ * 
+ * @author Kristian
+ */
+public class Application {
+	public static void main(String[] args) {
+		// For now, though we might consider making a proper application
+		System.out.println("This is a Bukkit library. Place it in the plugin-folder and restart the server!");
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/AsynchronousManager.java

@@ -0,0 +1,102 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+import java.util.Set;
+import java.util.logging.Logger;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.async.AsyncListenerHandler;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+
+/**
+ * Represents a asynchronous packet handler.
+ * 
+ * @author Kristian
+ */
+public interface AsynchronousManager {
+	/**
+	 * Registers an asynchronous packet handler.
+	 * <p>
+	 * To start listening asynchronously, pass the getListenerLoop() runnable to a different thread.
+	 * @param listener - the packet listener that will recieve these asynchronous events.
+	 * @return An asynchrouns handler.
+	 */
+	public abstract AsyncListenerHandler registerAsyncHandler(PacketListener listener);
+
+	/**
+	 * Unregisters and closes the given asynchronous handler.
+	 * @param handler - asynchronous handler.
+	 */
+	public abstract void unregisterAsyncHandler(AsyncListenerHandler handler);
+
+	/**
+	 * Unregisters every asynchronous handler associated with this plugin.
+	 * @param plugin - the original plugin.
+	 */
+	public void unregisterAsyncHandlers(Plugin plugin);
+	
+	/**
+	 * Retrieves a immutable set containing the ID of the sent server packets that will be 
+	 * observed by the asynchronous listeners.
+	 * @return Every filtered server packet.
+	 */
+	public abstract Set<Integer> getSendingFilters();
+
+	/**
+	 * Retrieves a immutable set containing the ID of the recieved client packets that will be
+	 * observed by the asynchronous listeners.
+	 * @return Every filtered client packet.
+	 */
+	public abstract Set<Integer> getReceivingFilters();
+
+	/**
+	 * Determine if a given synchronous packet has asynchronous listeners.
+	 * @param packet - packet to test.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public abstract boolean hasAsynchronousListeners(PacketEvent packet);
+
+	/**
+	 * Retrieve the default packet stream.
+	 * @return Default packet stream.
+	 */
+	public abstract PacketStream getPacketStream();
+
+	/**
+	 * Retrieve the default error logger.
+	 * @return Default logger.
+	 */
+	public abstract Logger getLogger();
+
+	/**
+	 * Remove listeners, close threads and transmit every delayed packet.
+	 */
+	public abstract void cleanupAll();
+
+	/**
+	 * Signal that a packet is ready to be transmitted.
+	 * <p>
+	 * This should only be called if {@link com.comphenix.protocol.async.AsyncMarker#incrementProcessingDelay() AsyncMarker.incrementProcessingDelay()}
+	 * has been called previously.
+	 * @param packet - packet to signal.
+	 */
+	public abstract void signalPacketTransmission(PacketEvent packet);
+}

ProtocolLib/src/main/java/com/comphenix/protocol/PacketStream.java

@@ -1,90 +1,72 @@
-package com.comphenix.protocol;
-
-import java.lang.reflect.InvocationTargetException;
-import java.util.Set;
-
-import org.bukkit.entity.Player;
-
-import com.comphenix.protocol.events.PacketContainer;
-import com.comphenix.protocol.events.PacketListener;
-import com.google.common.collect.ImmutableSet;
-
-public interface ProtocolManager {
-
-	/**
-	 * Retrieves a list of every registered packet listener.
-	 * @return Every registered packet listener.
-	 */
-	public abstract ImmutableSet<PacketListener> getPacketListeners();
-
-	/**
-	 * Adds a packet listener.
-	 * @param listener - new packet listener.
-	 */
-	public abstract void addPacketListener(PacketListener listener);
-
-	/**
-	 * Removes a given packet listener.
-	 * @param listener - the packet listener to remove.
-	 */
-	public abstract void removePacketListener(PacketListener listener);
-
-	/**
-	 * Send a packet to the given player.
-	 * @param reciever - the reciever.
-	 * @param packet - packet to send.
-	 * @throws InvocationTargetException - if an error occured when sending the packet.
-	 */
-	public void sendServerPacket(Player reciever, PacketContainer packet) 
-			throws InvocationTargetException;
-
-	/**
-	 * Send a packet to the given player.
-	 * @param reciever - the reciever.
-	 * @param packet - packet to send.
-	 * @param filters - whether or not to invoke any packet filters.
-	 * @throws InvocationTargetException - if an error occured when sending the packet.
-	 */
-	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters)
-			throws InvocationTargetException;
-
-	/**
-	 * Simulate recieving a certain packet from a given player.
-	 * @param sender - the sender.
-	 * @param packet - the packet that was sent.
-	 * @throws InvocationTargetException If the reflection machinery failed.
-	 * @throws IllegalAccessException If the underlying method caused an error.
-	 */
-	public void recieveClientPacket(Player sender, PacketContainer packet) 
-			throws IllegalAccessException, InvocationTargetException;
-
-	/**
-	 * Simulate recieving a certain packet from a given player.
-	 * @param sender - the sender.
-	 * @param packet - the packet that was sent.
-	 * @param filters - whether or not to invoke any packet filters.
-	 * @throws InvocationTargetException If the reflection machinery failed.
-	 * @throws IllegalAccessException If the underlying method caused an error.
-	 */
-	public void recieveClientPacket(Player sender, PacketContainer packet, boolean filters)
-			throws IllegalAccessException, InvocationTargetException;
-
-	/**
-	 * Constructs a new encapsulated Minecraft packet with the given ID.
-	 * @param id - packet ID.
-	 * @return New encapsulated Minecraft packet.
-	 */
-	public PacketContainer createPacket(int id);
-
-	/**
-	 * Retieves a set of every enabled packet.
-	 * @return Every packet filter.
-	 */
-	public Set<Integer> getPacketFilters();
-
-	/**
-	 * Determines whether or not is protocol mananger has been disabled. 
-	 * @return TRUE if it has, FALSE otherwise.
-	 */
-	public boolean isClosed();
-}
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+import java.lang.reflect.InvocationTargetException;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.events.PacketContainer;
+
+/**
+ * Represents a object capable of sending or receiving packets.
+ * 
+ * @author Kristian
+ */
+public interface PacketStream {
+	
+	/**
+	 * Send a packet to the given player.
+	 * @param reciever - the reciever.
+	 * @param packet - packet to send.
+	 * @throws InvocationTargetException - if an error occured when sending the packet.
+	 */
+	public void sendServerPacket(Player reciever, PacketContainer packet) 
+			throws InvocationTargetException;
+
+	/**
+	 * Send a packet to the given player.
+	 * @param reciever - the reciever.
+	 * @param packet - packet to send.
+	 * @param filters - whether or not to invoke any packet filters.
+	 * @throws InvocationTargetException - if an error occured when sending the packet.
+	 */
+	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters)
+			throws InvocationTargetException;
+
+	/**
+	 * Simulate recieving a certain packet from a given player.
+	 * @param sender - the sender.
+	 * @param packet - the packet that was sent.
+	 * @throws InvocationTargetException If the reflection machinery failed.
+	 * @throws IllegalAccessException If the underlying method caused an error.
+	 */
+	public void recieveClientPacket(Player sender, PacketContainer packet) 
+			throws IllegalAccessException, InvocationTargetException;
+
+	/**
+	 * Simulate recieving a certain packet from a given player.
+	 * @param sender - the sender.
+	 * @param packet - the packet that was sent.
+	 * @param filters - whether or not to invoke any packet filters.
+	 * @throws InvocationTargetException If the reflection machinery failed.
+	 * @throws IllegalAccessException If the underlying method caused an error.
+	 */
+	public void recieveClientPacket(Player sender, PacketContainer packet, boolean filters)
+			throws IllegalAccessException, InvocationTargetException;
+}

ProtocolLib/src/main/java/com/comphenix/protocol/Packets.java

@@ -0,0 +1,257 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+import java.util.Set;
+
+import com.comphenix.protocol.injector.PacketFilterManager;
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.IntEnum;
+
+/**
+ * List of known packet IDs since 1.3.2.
+ * 
+ * @author Kristian
+ */
+public final class Packets {
+	
+	/**
+	 * List of packets sent only by the server.
+	 * @author Kristian
+	 */
+	public static final class Server extends IntEnum {
+		/**
+		 * The singleton instance. Can also be retrieved from the parent class.
+		 */
+		private static Server INSTANCE = new Server();
+		
+		public static final int KEEP_ALIVE = 0;
+		public static final int LOGIN = 1;
+		public static final int CHAT = 3;
+		public static final int UPDATE_TIME = 4;
+		public static final int ENTITY_EQUIPMENT = 5;
+		public static final int SPAWN_POSITION = 6;
+		public static final int UPDATE_HEALTH = 8;
+		public static final int RESPAWN = 9;
+		public static final int FLYING = 10;
+		public static final int PLAYER_POSITION = 11;
+		public static final int PLAYER_LOOK = 12;
+		public static final int PLAYER_LOOK_MOVE = 13;
+		public static final int ENTITY_LOCATION_ACTION = 17;
+		public static final int ARM_ANIMATION = 18;
+		public static final int NAMED_ENTITY_SPAWN = 20;
+		public static final int PICKUP_SPAWN = 21;
+		public static final int COLLECT = 22;
+		public static final int VEHICLE_SPAWN = 23;
+		public static final int MOB_SPAWN = 24;
+		public static final int ENTITY_PAINTING = 25;
+		public static final int ADD_EXP_ORB = 26;
+		public static final int ENTITY_VELOCITY = 28;
+		public static final int DESTROY_ENTITY = 29;
+		public static final int ENTITY = 30;
+		public static final int REL_ENTITY_MOVE = 31;
+		public static final int ENTITY_LOOK = 32;
+		public static final int REL_ENTITY_MOVE_LOOK = 33;
+		public static final int ENTITY_TELEPORT = 34;
+		public static final int ENTITY_HEAD_ROTATION = 35;
+		public static final int ENTITY_STATUS = 38;
+		public static final int ATTACH_ENTITY = 39;
+		public static final int ENTITY_METADATA = 40;
+		public static final int MOB_EFFECT = 41;
+		public static final int REMOVE_MOB_EFFECT = 42;
+		public static final int SET_EXPERIENCE = 43;
+		public static final int MAP_CHUNK = 51;
+		public static final int MULTI_BLOCK_CHANGE = 52;
+		public static final int BLOCK_CHANGE = 53;
+		public static final int PLAY_NOTE_BLOCK = 54;
+		public static final int BLOCK_BREAK_ANIMATION = 55;
+		public static final int MAP_CHUNK_BULK = 56;
+		public static final int EXPLOSION = 60;
+		public static final int WORLD_EVENT = 61;
+		public static final int NAMED_SOUND_EFFECT = 62;
+		public static final int BED = 70;
+		public static final int WEATHER = 71;
+		public static final int OPEN_WINDOW = 100;
+		public static final int CLOSE_WINDOW = 101;
+		public static final int SET_SLOT = 103;
+		public static final int WINDOW_ITEMS = 104;
+		public static final int CRAFT_PROGRESS_BAR = 105;
+		public static final int TRANSACTION = 106;
+		public static final int SET_CREATIVE_SLOT = 107;
+		public static final int UPDATE_SIGN = 130;
+		public static final int ITEM_DATA = 131;
+		public static final int TILE_ENTITY_DATA = 132;
+		public static final int STATISTIC = 200;
+		public static final int PLAYER_INFO = 201;
+		public static final int ABILITIES = 202;
+		public static final int TAB_COMPLETE = 203;
+		public static final int CUSTOM_PAYLOAD = 250;
+		public static final int KEY_RESPONSE = 252;
+		public static final int KEY_REQUEST = 253;
+		public static final int KICK_DISCONNECT = 255;
+		
+		/**
+		 * A registry that parses between names and packet IDs.
+		 * @return The current server registry.
+		 */
+		public static Server getRegistry() {
+			return INSTANCE;
+		}
+		
+		/**
+		 * Determine if the given packet is a valid server packet in the current version of Minecraft.
+		 * @param packetID - the packet to test.
+		 * @return TRUE if this packet is supported, FALSE otherwise.
+		 * @throws FieldAccessException If we're unable to retrieve the server packet data from Minecraft.
+		 */
+		public static boolean isSupported(int packetID) throws FieldAccessException {
+			return PacketFilterManager.getServerPackets().contains(packetID);
+		}
+		
+		/**
+		 * Retrieve every client packet the current version of Minecraft is aware of.
+		 * @return Every supported server packet.
+		 * @throws FieldAccessException If we're unable to retrieve the server packet data from Minecraft.
+		 */
+		public static Set<Integer> getSupported() throws FieldAccessException {
+			return PacketFilterManager.getServerPackets();
+		}
+		
+		// We only allow a single instance of this class
+	    private Server() {
+			super();
+		}
+	}
+	
+	/**
+	 * List of packets sent by the client.
+	 * @author Kristian
+	 */
+	public static class Client extends IntEnum {
+		/**
+		 * The singleton instance. Can also be retrieved from the parent class.
+		 */
+		private static Client INSTANCE = new Client();
+		
+		public static final int KEEP_ALIVE = 0;
+		public static final int LOGIN = 1;
+		public static final int HANDSHAKE = 2;
+		public static final int CHAT = 3;
+		public static final int USE_ENTITY = 7;
+		public static final int RESPAWN = 9;
+		public static final int FLYING = 10;
+		public static final int PLAYER_POSITION = 11;
+		public static final int PLAYER_LOOK = 12;
+		public static final int PLAYER_LOOK_MOVE = 13;
+		public static final int BLOCK_DIG = 14;
+		public static final int PLACE = 15;
+		public static final int BLOCK_ITEM_SWITCH = 16;
+		public static final int ARM_ANIMATION = 18;
+		public static final int ENTITY_ACTION = 19;
+		public static final int CLOSE_WINDOW = 101;
+		public static final int WINDOW_CLICK = 102;
+		public static final int TRANSACTION = 106;
+		public static final int SET_CREATIVE_SLOT = 107;
+		public static final int BUTTON_CLICK = 108;
+		public static final int UPDATE_SIGN = 130;
+		public static final int ABILITIES = 202;
+		public static final int TAB_COMPLETE = 203;
+		public static final int LOCALE_AND_VIEW_DISTANCE = 204;
+		public static final int CLIENT_COMMAND = 205;
+		public static final int CUSTOM_PAYLOAD = 250;
+		public static final int KEY_RESPONSE = 252;
+		public static final int GET_INFO = 254;
+		public static final int KICK_DISCONNECT = 255;
+		
+		/**
+		 * A registry that parses between names and packet IDs.
+		 * @return The current client registry.
+		 */
+		public static Client getRegistry() {
+			return INSTANCE;
+		}
+		
+		/**
+		 * Determine if the given packet is a valid client packet in the current version of Minecraft.
+		 * @param packetID - the packet to test.
+		 * @return TRUE if this packet is supported, FALSE otherwise.
+		 * @throws FieldAccessException If we're unable to retrieve the client packet data from Minecraft.
+		 */
+		public static boolean isSupported(int packetID) throws FieldAccessException {
+			return PacketFilterManager.getClientPackets().contains(packetID);
+		}
+		
+		/**
+		 * Retrieve every client packet the current version of Minecraft is aware of.
+		 * @return Every supported client packet.
+		 * @throws FieldAccessException If we're unable to retrieve the client packet data from Minecraft.
+		 */
+		public static Set<Integer> getSupported() throws FieldAccessException {
+			return PacketFilterManager.getClientPackets();
+		}
+		
+		// Like above
+		private Client() {
+			super();
+		}
+	}
+	
+	/**
+	 * A registry that parses between names and packet IDs.
+	 * @return The current client registry.
+	 */
+	public static Server getServerRegistry() {
+		return Server.getRegistry();
+	}
+
+	/**
+	 * A registry that parses between names and packet IDs.
+	 * @return The current server registry.
+	 */
+	public static Client getClientRegistry() {
+		return Client.INSTANCE;
+	}
+	
+	/**
+	 * Find a packet by name. Must be capitalized and use underscores.
+	 * @param name - name of packet to find.
+	 * @return The packet ID found.
+	 */
+	public static int valueOf(String name) {
+		Integer serverAttempt = Server.INSTANCE.valueOf(name);
+		
+		if (serverAttempt != null)
+			return serverAttempt;
+		else
+			return Client.INSTANCE.valueOf(name);
+	}
+	
+	/**
+	 * Retrieves the name of a packet.
+	 * @param packetID - packet to retrieve name.
+	 * @return The name, or NULL if unable to find such a packet.
+	 */
+	public static String getDeclaredName(int packetID) {
+		String serverAttempt = Server.INSTANCE.getDeclaredName(packetID);
+		
+		if (serverAttempt != null)
+			return serverAttempt;
+		else
+			return Client.INSTANCE.getDeclaredName(packetID);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolLibrary.java

@@ -0,0 +1,228 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.bukkit.Server;
+import org.bukkit.plugin.PluginManager;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import com.comphenix.protocol.async.AsyncFilterManager;
+import com.comphenix.protocol.events.ConnectionSide;
+import com.comphenix.protocol.events.MonitorAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.DelayedSingleTask;
+import com.comphenix.protocol.injector.PacketFilterManager;
+import com.comphenix.protocol.metrics.Statistics;
+import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
+
+/**
+ * The main entry point for ProtocolLib.
+ * 
+ * @author Kristian
+ */
+public class ProtocolLibrary extends JavaPlugin {
+	
+	// There should only be one protocol manager, so we'll make it static
+	private static PacketFilterManager protocolManager;
+	
+	// Error logger
+	private Logger logger;
+	
+	// Metrics and statistisc
+	private Statistics statistisc;
+	
+	// Structure compiler
+	private BackgroundCompiler backgroundCompiler;
+	
+	// Used to clean up server packets that have expired. 
+	// But mostly required to simulate recieving client packets.
+	private int asyncPacketTask = -1;
+	private int tickCounter = 0;
+	private static final int ASYNC_PACKET_DELAY = 1;
+	
+	// Used to unhook players after a delay
+	private DelayedSingleTask unhookTask;
+	
+	// Used for debugging
+	private boolean debugListener;
+	
+	@Override
+	public void onLoad() {
+		logger = getLoggerSafely();
+		unhookTask = new DelayedSingleTask(this);
+		protocolManager = new PacketFilterManager(getClassLoader(), getServer(), unhookTask, logger);
+	}
+	
+	@Override
+	public void onEnable() {
+		Server server = getServer();
+		PluginManager manager = server.getPluginManager();
+		
+		// Initialize background compiler
+		if (backgroundCompiler == null) {
+			backgroundCompiler = new BackgroundCompiler(getClassLoader());
+			BackgroundCompiler.setInstance(backgroundCompiler);
+		}
+
+		// Notify server managers of incompatible plugins
+		checkForIncompatibility(manager);
+		
+		// Player login and logout events
+		protocolManager.registerEvents(manager, this);
+			
+		// Worker that ensures that async packets are eventually sent
+		createAsyncTask(server);
+		//toggleDebugListener();
+		
+		// Try to enable statistics
+		try {
+			statistisc = new Statistics(this);
+		} catch (IOException e) {
+			logger.log(Level.SEVERE, "Unable to enable metrics.", e);
+		} catch (Throwable e) {
+			logger.log(Level.SEVERE, "Metrics cannot be enabled. Incompatible Bukkit version.", e);
+		}
+	}
+
+	/**
+	 * Toggle a listener that prints every sent and received packet.
+	 */
+	void toggleDebugListener() {
+		
+		if (debugListener) {
+			protocolManager.removePacketListeners(this);
+		} else {
+			// DEBUG DEBUG
+			protocolManager.addPacketListener(new MonitorAdapter(this, ConnectionSide.BOTH, logger) {
+				@Override
+				public void onPacketReceiving(PacketEvent event) {
+					Object handle = event.getPacket().getHandle();
+					
+					System.out.println(String.format(
+							"RECEIVING %s@%s from %s.",
+							handle.getClass().getSimpleName(), handle.hashCode(), event.getPlayer().getName()
+					));
+				};
+				@Override
+				public void onPacketSending(PacketEvent event) {
+					Object handle = event.getPacket().getHandle();
+					
+					System.out.println(String.format(
+							"SENDING %s@%s from %s.",
+							handle.getClass().getSimpleName(), handle.hashCode(), event.getPlayer().getName()
+					));
+				}
+			});
+		}
+		debugListener = !debugListener;
+	}
+	
+	private void createAsyncTask(Server server) {
+		try {
+			if (asyncPacketTask >= 0)
+				throw new IllegalStateException("Async task has already been created");
+			
+			// Attempt to create task
+			asyncPacketTask = server.getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {
+				@Override
+				public void run() {
+					AsyncFilterManager manager = (AsyncFilterManager) protocolManager.getAsynchronousManager();
+					
+					// We KNOW we're on the main thread at the moment
+					manager.sendProcessedPackets(tickCounter++, true);
+				}
+			}, ASYNC_PACKET_DELAY, ASYNC_PACKET_DELAY);
+		
+		} catch (Throwable e) {
+			if (asyncPacketTask == -1) {
+				logger.log(Level.SEVERE, "Unable to create packet timeout task.", e);
+			}
+		}
+	}
+	
+	private void checkForIncompatibility(PluginManager manager) {
+		// Plugin authors: Notify me to remove these
+		String[] incompatiblePlugins = {};
+		
+		for (String plugin : incompatiblePlugins) {
+			if (manager.getPlugin(plugin) != null) {
+				// Check for versions, ect.
+				logger.severe("Detected incompatible plugin: " + plugin);
+			}
+		}
+	}
+	
+	@Override
+	public void onDisable() {
+		// Disable compiler
+		if (backgroundCompiler != null) {
+			backgroundCompiler.shutdownAll();
+			backgroundCompiler = null;
+			BackgroundCompiler.setInstance(null);
+		}
+		
+		// Clean up
+		if (asyncPacketTask >= 0) {
+			getServer().getScheduler().cancelTask(asyncPacketTask);
+			asyncPacketTask = -1;
+		}
+		
+		unhookTask.close();
+		protocolManager.close();
+		protocolManager = null;
+		statistisc = null;
+	}
+	
+	/**
+	 * Retrieves the packet protocol manager.
+	 * @return Packet protocol manager, or NULL if it has been disabled.
+	 */
+	public static ProtocolManager getProtocolManager() {
+		return protocolManager;
+	}
+	
+	/**
+	 * Retrieve the metrics instance used to measure users of this library.
+	 * <p>
+	 * Note that this method may return NULL when the server is reloading or shutting down.
+	 * @return Metrics instance container.
+	 */
+	public Statistics getStatistics() {
+		return statistisc;
+	}
+	
+	// Get the Bukkit logger first, before we try to create our own
+	private Logger getLoggerSafely() {
+		
+		Logger log = null;
+	
+		try {
+			log = getLogger();
+		} catch (Throwable e) {
+			// We'll handle it
+		}
+		
+		if (log == null)
+			log = Logger.getLogger("Minecraft");
+		return log;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolManager.java

@@ -0,0 +1,131 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol;
+
+import java.util.List;
+import java.util.Set;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.PacketConstructor;
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Represents an API for accessing the Minecraft protocol.
+ * @author Kristian
+ */
+public interface ProtocolManager extends PacketStream {
+
+	/**
+	 * Retrieves a list of every registered packet listener.
+	 * @return Every registered packet listener.
+	 */
+	public ImmutableSet<PacketListener> getPacketListeners();
+
+	/**
+	 * Adds a packet listener. 
+	 * <p>
+	 * Adding an already registered listener has no effect. If you need to change the packets 
+	 * the current listener is observing, you must first remove the packet listener before you 
+	 * can register it again.
+	 * @param listener - new packet listener.
+	 */
+	public void addPacketListener(PacketListener listener);
+
+	/**
+	 * Removes a given packet listener. 
+	 * <p>
+	 * Attempting to remove a listener that doesn't exist has no effect.
+	 * @param listener - the packet listener to remove.
+	 */
+	public void removePacketListener(PacketListener listener);
+
+	/**
+	 * Removes every listener associated with the given plugin.
+	 * @param plugin - the plugin to unload.
+	 */
+	public void removePacketListeners(Plugin plugin);
+
+	/**
+	 * Constructs a new encapsulated Minecraft packet with the given ID.
+	 * @param id - packet ID.
+	 * @return New encapsulated Minecraft packet.
+	 */
+	public PacketContainer createPacket(int id);
+	
+	/**
+	 * Constructs a new encapsulated Minecraft packet with the given ID.
+	 * <p>
+	 * If set to true, the <i>forceDefaults</i> option will force the system to automatically 
+	 * give non-primitive fields in the packet sensible default values. For instance, certain
+	 * packets - like Packet60Explosion - require a List or Set to be non-null. If the
+	 * forceDefaults option is true, the List or Set will be automatically created.
+	 * 
+	 * @param id - packet ID.
+	 * @param forceDefaults - TRUE to use sensible defaults in most fields, FALSE otherwise.
+	 * @return New encapsulated Minecraft packet.
+	 */
+	public PacketContainer createPacket(int id, boolean forceDefaults);
+
+	/**
+	 * Construct a packet using the special builtin Minecraft constructors.
+	 * @param id - the packet ID.
+	 * @param arguments - arguments that will be passed to the constructor.
+	 * @return The packet constructor.
+	 */
+	public PacketConstructor createPacketConstructor(int id, Object... arguments);
+	
+	/**
+	 * Completely refresh all clients about an entity.
+	 * <p>
+	 * Note that this method is NOT thread safe. If you call this method from anything 
+	 * but the main thread, it will throw an exception.
+	 * @param entity - entity to refresh.
+	 * @param observers - the clients to update.
+	 */
+	public void updateEntity(Entity entity, List<Player> observers) throws FieldAccessException;
+	
+	/**
+	 * Retrieves a immutable set containing the ID of the sent server packets that will be observed by listeners.
+	 * @return Every filtered server packet.
+	 */
+	public Set<Integer> getSendingFilters();
+	
+	/**
+	 * Retrieves a immutable set containing the ID of the recieved client packets that will be observed by listeners.
+	 * @return Every filtered client packet.
+	 */
+	public Set<Integer> getReceivingFilters();
+	
+	/**
+	 * Determines whether or not this protocol mananger has been disabled. 
+	 * @return TRUE if it has, FALSE otherwise.
+	 */
+	public boolean isClosed();
+
+	/**
+	 * Retrieve the current asyncronous packet manager.
+	 * @return Asyncronous packet manager.
+	 */
+	public AsynchronousManager getAsynchronousManager();
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncFilterManager.java

@@ -0,0 +1,344 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Logger;
+
+import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitScheduler;
+
+import com.comphenix.protocol.AsynchronousManager;
+import com.comphenix.protocol.PacketStream;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.PacketFilterManager;
+import com.comphenix.protocol.injector.PrioritizedListener;
+import com.google.common.base.Objects;
+
+/**
+ * Represents a filter manager for asynchronous packets.
+ * 
+ * @author Kristian
+ */
+public class AsyncFilterManager implements AsynchronousManager {
+
+	private PacketProcessingQueue serverProcessingQueue;
+	private PacketSendingQueue serverQueue;
+	
+	private PacketProcessingQueue clientProcessingQueue;
+	private PacketSendingQueue clientQueue;
+	
+	private Logger logger;
+	
+	// The likely main thread
+	private Thread mainThread;
+	
+	// Default scheduler
+	private BukkitScheduler scheduler;
+	
+	// Our protocol manager
+	private ProtocolManager manager;
+	
+	// Current packet index
+	private AtomicInteger currentSendingIndex = new AtomicInteger();
+	
+	// Whether or not we're currently cleaning up
+	private volatile boolean cleaningUp;
+	
+	public AsyncFilterManager(Logger logger, BukkitScheduler scheduler, ProtocolManager manager) {
+		
+		// Server packets are synchronized already
+		this.serverQueue = new PacketSendingQueue(false);
+		
+		// Client packets must be synchronized
+		this.clientQueue = new PacketSendingQueue(true); 
+		
+		this.serverProcessingQueue = new PacketProcessingQueue(serverQueue);
+		this.clientProcessingQueue = new PacketProcessingQueue(clientQueue);
+		
+		this.scheduler = scheduler;
+		this.manager = manager;
+		
+		this.logger = logger;
+		this.mainThread = Thread.currentThread();
+	}
+	
+	@Override
+	public AsyncListenerHandler registerAsyncHandler(PacketListener listener) {
+		return registerAsyncHandler(listener, true);
+	}
+	
+	/**
+	 * Registers an asynchronous packet handler.
+	 * <p>
+	 * To start listening asynchronously, pass the getListenerLoop() runnable to a different thread.
+	 * <p>
+	 * Asynchronous events will only be executed if a synchronous listener with the same packets is registered.
+	 * If you already have a synchronous event, call this method with autoInject set to FALSE.
+	 * 
+	 * @param listener - the packet listener that will recieve these asynchronous events.
+	 * @param autoInject - whether or not to automatically create the corresponding synchronous listener,
+	 * @return An asynchrouns handler.
+	 */
+	public AsyncListenerHandler registerAsyncHandler(PacketListener listener, boolean autoInject) {
+		AsyncListenerHandler handler = new AsyncListenerHandler(mainThread, this, listener);
+		
+		ListeningWhitelist sendingWhitelist = listener.getSendingWhitelist();
+		ListeningWhitelist receivingWhitelist = listener.getReceivingWhitelist();
+		
+		// Add listener to either or both processing queue
+		if (hasValidWhitelist(sendingWhitelist)) {
+			PacketFilterManager.verifyWhitelist(listener, sendingWhitelist);
+			serverProcessingQueue.addListener(handler, sendingWhitelist);
+		}
+		
+		if (hasValidWhitelist(receivingWhitelist)) {
+			PacketFilterManager.verifyWhitelist(listener, receivingWhitelist);
+			clientProcessingQueue.addListener(handler, receivingWhitelist);
+		}
+		
+		// We need a synchronized listener to get the ball rolling
+		if (autoInject) {
+			handler.setNullPacketListener(new NullPacketListener(listener));
+			manager.addPacketListener(handler.getNullPacketListener());
+		}
+		
+		return handler;
+	}
+	
+	private boolean hasValidWhitelist(ListeningWhitelist whitelist) {
+		return whitelist != null && whitelist.getWhitelist().size() > 0;
+	}
+	
+	@Override
+	public void unregisterAsyncHandler(AsyncListenerHandler handler) {
+		if (handler == null)
+			throw new IllegalArgumentException("listenerToken cannot be NULL");
+		
+		handler.cancel();	
+	}
+	
+	// Called by AsyncListenerHandler
+	void unregisterAsyncHandlerInternal(AsyncListenerHandler handler) {
+		
+		PacketListener listener = handler.getAsyncListener();
+		boolean synchronusOK = onMainThread();
+		
+		// Unregister null packet listeners
+		if (handler.getNullPacketListener() != null) {
+			manager.removePacketListener(handler.getNullPacketListener());
+		}
+		
+		// Just remove it from the queue(s)
+		if (hasValidWhitelist(listener.getSendingWhitelist())) {
+			List<Integer> removed = serverProcessingQueue.removeListener(handler, listener.getSendingWhitelist());
+			
+			// We're already taking care of this, so don't do anything
+			if (!cleaningUp)
+				serverQueue.signalPacketUpdate(removed, synchronusOK);
+		}
+		
+		if (hasValidWhitelist(listener.getReceivingWhitelist())) {
+			List<Integer> removed = clientProcessingQueue.removeListener(handler, listener.getReceivingWhitelist());
+			
+			if (!cleaningUp)
+				clientQueue.signalPacketUpdate(removed, synchronusOK);
+		}
+	}
+	
+	/**
+	 * Determine if we're running on the main thread.
+	 * @return TRUE if we are, FALSE otherwise.
+	 */
+	private boolean onMainThread() {
+		return Thread.currentThread().getId() == mainThread.getId();
+	}
+	
+	@Override
+	public void unregisterAsyncHandlers(Plugin plugin) {
+		unregisterAsyncHandlers(serverProcessingQueue, plugin);
+		unregisterAsyncHandlers(clientProcessingQueue, plugin);
+	}
+	
+	private void unregisterAsyncHandlers(PacketProcessingQueue processingQueue, Plugin plugin) {
+		
+		// Iterate through every packet listener
+		for (PrioritizedListener<AsyncListenerHandler> listener : processingQueue.values()) {			
+			// Remove the listener
+			if (Objects.equal(listener.getListener().getPlugin(), plugin)) {
+				unregisterAsyncHandler(listener.getListener());
+			}
+		}
+	}
+	
+	/**
+	 * Enqueue a packet for asynchronous processing.
+	 * @param syncPacket - synchronous packet event.
+	 * @param asyncMarker - the asynchronous marker to use.
+	 */
+	public synchronized void enqueueSyncPacket(PacketEvent syncPacket, AsyncMarker asyncMarker) {
+		PacketEvent newEvent = PacketEvent.fromSynchronous(syncPacket, asyncMarker);
+		
+		if (asyncMarker.isQueued() || asyncMarker.isTransmitted())
+			throw new IllegalArgumentException("Cannot queue a packet that has already been queued.");
+		
+		asyncMarker.setQueuedSendingIndex(asyncMarker.getNewSendingIndex());
+		
+		// Start the process
+		getSendingQueue(syncPacket).enqueue(newEvent);
+		
+		// We know this is occuring on the main thread, so pass TRUE
+		getProcessingQueue(syncPacket).enqueue(newEvent, true);
+	}
+	
+	@Override
+	public Set<Integer> getSendingFilters() {
+		return serverProcessingQueue.keySet();
+	}
+	
+	@Override
+	public Set<Integer> getReceivingFilters() {
+		return clientProcessingQueue.keySet();
+	}
+	
+	/**
+	 * Used to create a default asynchronous task.
+	 * @param plugin - the calling plugin.
+	 * @param runnable - the runnable.
+	 */
+	public void scheduleAsyncTask(Plugin plugin, Runnable runnable) {
+		scheduler.scheduleAsyncDelayedTask(plugin, runnable);
+	}
+	
+	@Override
+	public boolean hasAsynchronousListeners(PacketEvent packet) {
+		 Collection<?> list = getProcessingQueue(packet).getListener(packet.getPacketID());
+		 return list != null && list.size() > 0;
+	}
+	
+	/**
+	 * Construct a asynchronous marker with all the default values.
+	 * @return Asynchronous marker.
+	 */
+	public AsyncMarker createAsyncMarker() {
+		return createAsyncMarker(AsyncMarker.DEFAULT_SENDING_DELTA, AsyncMarker.DEFAULT_TIMEOUT_DELTA);
+	}
+	
+	/**
+	 * Construct an async marker with the given sending priority delta and timeout delta.
+	 * @param sendingDelta - how many packets we're willing to wait.
+	 * @param timeoutDelta - how long (in ms) until the packet expire.
+	 * @return An async marker.
+	 */
+	public AsyncMarker createAsyncMarker(long sendingDelta, long timeoutDelta) {
+		return createAsyncMarker(sendingDelta, timeoutDelta, 
+								 currentSendingIndex.incrementAndGet(), System.currentTimeMillis());
+	}
+	
+	// Helper method
+	private AsyncMarker createAsyncMarker(long sendingDelta, long timeoutDelta, long sendingIndex, long currentTime) {
+		return new AsyncMarker(manager, sendingIndex, sendingDelta, System.currentTimeMillis(), timeoutDelta);
+	}
+	
+	@Override
+	public PacketStream getPacketStream() {
+		return manager;
+	}
+
+	@Override
+	public Logger getLogger() {
+		return logger;
+	}
+
+	@Override
+	public void cleanupAll() {
+		cleaningUp = true;
+		serverProcessingQueue.cleanupAll();
+		serverQueue.cleanupAll();
+	}
+
+	@Override
+	public void signalPacketTransmission(PacketEvent packet) {
+		signalPacketTransmission(packet, onMainThread());
+	}
+
+	/**
+	 * Signal that a packet is ready to be transmitted.
+	 * @param packet - packet to signal.
+	 * @param onMainThread - whether or not this method was run by the main thread.
+	 */
+	private void signalPacketTransmission(PacketEvent packet, boolean onMainThread) {
+		AsyncMarker marker = packet.getAsyncMarker();
+		if (marker == null)
+			throw new IllegalArgumentException(
+					"A sync packet cannot be transmitted by the asynchronous manager.");
+		if (!marker.isQueued())
+			throw new IllegalArgumentException(
+					"A packet must have been queued before it can be transmitted.");
+		
+		// Only send if the packet is ready
+		if (marker.decrementProcessingDelay() == 0) {			
+			getSendingQueue(packet).signalPacketUpdate(packet, onMainThread);
+		}
+	}
+	
+	/**
+	 * Retrieve the sending queue this packet belongs to.
+	 * @param packet - the packet.
+	 * @return The server or client sending queue the packet belongs to.
+	 */
+	private PacketSendingQueue getSendingQueue(PacketEvent packet) {
+		return packet.isServerPacket() ? serverQueue : clientQueue;
+	}
+	
+	/**
+	 * Signal that a packet has finished processing.
+	 * @param packet - packet to signal.
+	 */
+	public void signalFreeProcessingSlot(PacketEvent packet) {
+		getProcessingQueue(packet).signalProcessingDone();
+	}
+	
+	/**
+	 * Retrieve the processing queue this packet belongs to.
+	 * @param packet - the packet.
+	 * @return The server or client sending processing the packet belongs to.
+	 */
+	private PacketProcessingQueue getProcessingQueue(PacketEvent packet) {
+		return packet.isServerPacket() ? serverProcessingQueue : clientProcessingQueue;
+	}
+
+	/**
+	 * Send any due packets, or clean up packets that have expired.
+	 */
+	public void sendProcessedPackets(int tickCounter, boolean onMainThread) {
+		
+		// The server queue is unlikely to need checking that often
+		if (tickCounter % 10 == 0) {
+			serverQueue.trySendPackets(onMainThread);
+		}
+
+		clientQueue.trySendPackets(onMainThread);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncListenerHandler.java

@@ -0,0 +1,499 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Level;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+import com.google.common.base.Function;
+import com.google.common.base.Joiner;
+
+/**
+ * Represents a handler for an asynchronous event.
+ * 
+ * @author Kristian
+ */
+public class AsyncListenerHandler {
+
+	/**
+	 * Signal an end to packet processing.
+	 */
+	private static final PacketEvent INTERUPT_PACKET = new PacketEvent(new Object());
+	
+	/**
+	 * Called when the threads have to wake up for something important.
+	 */
+	private static final PacketEvent WAKEUP_PACKET = new PacketEvent(new Object());
+	
+	// Unique worker ID
+	private static final AtomicInteger nextID = new AtomicInteger();
+	
+	// Default queue capacity
+	private static int DEFAULT_CAPACITY = 1024;
+	
+	// Cancel the async handler
+	private volatile boolean cancelled;
+	
+	// Number of worker threads
+	private final AtomicInteger started = new AtomicInteger();
+	
+	// The packet listener
+	private PacketListener listener;
+
+	// The filter manager
+	private AsyncFilterManager filterManager;
+	private NullPacketListener nullPacketListener;
+	
+	// List of queued packets
+	private ArrayBlockingQueue<PacketEvent> queuedPackets = new ArrayBlockingQueue<PacketEvent>(DEFAULT_CAPACITY);
+	
+	// List of cancelled tasks
+	private final Set<Integer> stoppedTasks = new HashSet<Integer>();
+	private final Object stopLock = new Object();
+	
+	// Minecraft main thread
+	private Thread mainThread;
+	
+	public AsyncListenerHandler(Thread mainThread, AsyncFilterManager filterManager, PacketListener listener) {
+		if (filterManager == null)
+			throw new IllegalArgumentException("filterManager cannot be NULL");
+		if (listener == null)
+			throw new IllegalArgumentException("listener cannot be NULL");
+
+		this.mainThread = mainThread;
+		this.filterManager = filterManager;
+		this.listener = listener;
+	}
+	
+	public boolean isCancelled() {
+		return cancelled;
+	}
+
+	public PacketListener getAsyncListener() {
+		return listener;
+	}
+
+	/**
+	 * Set the synchronized listener that has been automatically created.
+	 * @param nullPacketListener - automatically created listener.
+	 */
+	void setNullPacketListener(NullPacketListener nullPacketListener) {
+		this.nullPacketListener = nullPacketListener;
+	}
+
+	/**
+	 * Retrieve the synchronized listener that was automatically created.
+	 * @return Automatically created listener.
+	 */
+	PacketListener getNullPacketListener() {
+		return nullPacketListener;
+	}
+	
+	private String getPluginName() {
+		return PacketAdapter.getPluginName(listener);
+	}
+
+	/**
+	 * Retrieve the plugin associated with this async listener.
+	 * @return The plugin.
+	 */
+	public Plugin getPlugin() {
+		return listener != null ? listener.getPlugin() : null;
+	}
+	
+	/**
+	 * Cancel the handler.
+	 */
+	public void cancel() {
+		// Remove the listener as quickly as possible
+		close();
+	}
+
+	/**
+	 * Queue a packet for processing.
+	 * @param packet - a packet for processing.
+	 * @throws IllegalStateException If the underlying packet queue is full.
+	 */
+	public void enqueuePacket(PacketEvent packet) {
+		if (packet == null)
+			throw new IllegalArgumentException("packet is NULL");
+		
+		queuedPackets.add(packet);
+	}
+	
+	/**
+	 * Create a worker that will initiate the listener loop. Note that using stop() to
+	 * close a specific worker is less efficient than stopping an arbitrary worker.
+	 * <p>
+	 * <b>Warning</b>: Never call the run() method in the main thread.
+	 */
+	public AsyncRunnable getListenerLoop() {
+		return new AsyncRunnable() {
+
+			private final AtomicBoolean firstRun = new AtomicBoolean();
+			private final AtomicBoolean finished = new AtomicBoolean();
+			private final int id = nextID.incrementAndGet();
+			
+			@Override
+			public int getID() {
+				return id;
+			}
+			
+			@Override
+			public void run() {
+				// Careful now
+				if (firstRun.compareAndSet(false, true)) {
+					listenerLoop(id);
+					
+					synchronized (stopLock) {
+						stoppedTasks.remove(id);
+						stopLock.notifyAll();
+						finished.set(true);
+					}
+					
+				} else {
+					if (finished.get())
+						throw new IllegalStateException(
+							"This listener has already been run. Create a new instead.");
+					else
+						throw new IllegalStateException(
+							"This listener loop has already been started. Create a new instead.");
+				}
+			}
+			
+			@Override
+			public boolean stop() throws InterruptedException {
+				synchronized (stopLock) {
+					if (!isRunning())
+						return false;
+
+					stoppedTasks.add(id);
+			
+					// Wake up threads - we have a listener to stop
+					for (int i = 0; i < getWorkers(); i++) {
+						queuedPackets.offer(WAKEUP_PACKET);
+					}
+					
+					finished.set(true);
+					waitForStops();
+					return true;
+				}
+			}
+
+			@Override
+			public boolean isRunning() {
+				return firstRun.get() && !finished.get();
+			}
+			
+			@Override
+			public boolean isFinished() {
+				return finished.get();
+			}
+		};
+	}
+	
+	/**
+	 * Start a singler worker thread handling the asynchronous listener.
+	 */
+	public synchronized void start() {
+		if (listener.getPlugin() == null)
+			throw new IllegalArgumentException("Cannot start task without a valid plugin.");
+		if (cancelled)
+			throw new IllegalStateException("Cannot start a worker when the listener is closing.");
+		
+		final AsyncRunnable listenerLoop = getListenerLoop();
+		
+		filterManager.scheduleAsyncTask(listener.getPlugin(), new Runnable() {
+			@Override
+			public void run() {
+				Thread thread = Thread.currentThread();
+				
+				String previousName = thread.getName();
+				String workerName = getFriendlyWorkerName(listenerLoop.getID());
+
+				// Add the friendly worker name
+				thread.setName(workerName);
+				listenerLoop.run();
+				thread.setName(previousName);
+			}
+		});
+	}
+	
+	/**
+	 * Start a singler worker thread handling the asynchronous listener.
+	 * <p>
+	 * This method is intended to allow callers to customize the thread priority
+	 * before the worker loop is actually called. This is simpler than to
+	 * schedule the worker threads manually.
+	 * <pre><code>
+	 * listenerHandler.start(new Function&lt;AsyncRunnable, Void&gt;() {
+	 *     &#64;Override
+	 *     public Void apply(&#64;Nullable AsyncRunnable workerLoop) {
+	 *         Thread thread = Thread.currentThread();
+	 *         int prevPriority = thread.getPriority();
+	 *	       
+	 *         thread.setPriority(Thread.MIN_PRIORITY);
+	 *         workerLoop.run();
+	 *         thread.setPriority(prevPriority);
+	 *         return null;
+	 *     }
+	 *   });
+	 * }
+	 * </code></pre>
+	 * @param executor - a method that will execute the given listener loop.
+	 */
+	public synchronized void start(Function<AsyncRunnable, Void> executor) {
+		if (listener.getPlugin() == null)
+			throw new IllegalArgumentException("Cannot start task without a valid plugin.");
+		if (cancelled)
+			throw new IllegalStateException("Cannot start a worker when the listener is closing.");
+		
+		final AsyncRunnable listenerLoop = getListenerLoop();
+		final Function<AsyncRunnable, Void> delegateCopy = executor;
+		
+		filterManager.scheduleAsyncTask(listener.getPlugin(), new Runnable() {
+			@Override
+			public void run() {
+				delegateCopy.apply(listenerLoop);
+			}
+		});
+	}
+	
+	/**
+	 * Create a friendly thread name using the following convention:
+	 * <p><code>
+	 * &nbsp;&nbsp;&nbsp;&nbsp;Protocol Worker {id} - {plugin} - [recv: {packets}, send: {packets}]
+	 * </code></p>
+	 * @param id - the worker ID.
+	 * @return A friendly thread name.
+	 */
+	public String getFriendlyWorkerName(int id) {
+		return String.format("Protocol Worker #%s - %s - [recv: %s, send: %s]", 
+				id, 
+				PacketAdapter.getPluginName(listener), 
+				fromWhitelist(listener.getReceivingWhitelist()),
+				fromWhitelist(listener.getSendingWhitelist())
+		);
+	}
+	
+	/**
+	 * Convert the given whitelist to a comma-separated list of packet IDs.
+	 * @param whitelist - the whitelist.
+	 * @return A comma separated list of packet IDs in the whitelist, or the emtpy string.
+	 */
+	private String fromWhitelist(ListeningWhitelist whitelist) {
+		if (whitelist == null)
+			return "";
+		else
+			return Joiner.on(", ").join(whitelist.getWhitelist());
+	}
+	
+	/**
+	 * Start multiple worker threads for this listener.
+	 * @param count - number of worker threads to start.
+	 */
+	public synchronized void start(int count) {
+		for (int i = 0; i < count; i++)
+			start();
+	}
+	
+	/**
+	 * Stop a worker thread.
+	 */
+	public synchronized void stop() {
+		queuedPackets.add(INTERUPT_PACKET);
+	}
+	
+	/**
+	 * Stop the given amount of worker threads.
+	 * @param count - number of threads to stop.
+	 */
+	public synchronized void stop(int count) {
+		for (int i = 0; i < count; i++)
+			stop();
+	}
+	
+	/**
+	 * Set the current number of workers. 
+	 * <p>
+	 * This method can only be called with a count of zero when the listener is closing.
+	 * @param count - new number of workers.
+	 */
+	public synchronized void setWorkers(int count) {
+		if (count < 0)
+			throw new IllegalArgumentException("Number of workers cannot be less than zero.");
+		if (count > DEFAULT_CAPACITY)
+			throw new IllegalArgumentException("Cannot initiate more than " + DEFAULT_CAPACITY + " workers");
+		if (cancelled && count > 0)
+			throw new IllegalArgumentException("Cannot add workers when the listener is closing.");
+		
+		long time = System.currentTimeMillis();
+		
+		// Try to get to the correct count
+		while (started.get() != count) {
+			if (started.get() < count)
+				start();
+			else
+				stop();
+			
+			// May happen if another thread is doing something similar to "setWorkers"
+			if ((System.currentTimeMillis() - time) > 50)
+				throw new RuntimeException("Failed to set worker count.");
+		}
+	}
+	
+	/**
+	 * Retrieve the current number of registered workers.
+	 * <p>
+	 * Note that the returned value may be out of data.
+	 * @return Number of registered workers.
+	 */
+	public synchronized int getWorkers() {
+		return started.get();
+	}
+	
+	/**
+	 * Wait until every tasks scheduled to stop has actually stopped.
+	 * @return TRUE if the current listener should stop, FALSE otherwise.
+	 * @throws InterruptedException - If the current thread was interrupted.
+	 */
+	private boolean waitForStops() throws InterruptedException {
+		synchronized (stopLock) {
+			while (stoppedTasks.size() > 0 && !cancelled) {
+				stopLock.wait();
+			}
+			return cancelled;
+		}
+	}
+	
+	// DO NOT call this method from the main thread
+	private void listenerLoop(int workerID) {
+		
+		// Danger, danger!
+		if (Thread.currentThread().getId() == mainThread.getId()) 
+			throw new IllegalStateException("Do not call this method from the main thread.");
+		if (cancelled)
+			throw new IllegalStateException("Listener has been cancelled. Create a new listener instead.");
+
+		try {
+			// Wait if certain threads are stopping
+			if (waitForStops())
+				return;
+			
+			// Proceed
+			started.incrementAndGet();
+			
+			mainLoop:
+			while (!cancelled) {
+				PacketEvent packet = queuedPackets.take();
+				AsyncMarker marker = packet.getAsyncMarker();
+				
+				// Handle cancel requests
+				if (packet == null || marker == null || packet == INTERUPT_PACKET) {
+					return;
+					
+				} else if (packet == WAKEUP_PACKET) {
+					// This is a bit slow, but it should be safe
+					synchronized (stopLock) {
+						// Are we the one who is supposed to stop?
+						if (stoppedTasks.contains(workerID)) 
+							return;
+						if (waitForStops())
+							return;
+					}
+				}
+				
+				// Here's the core of the asynchronous processing
+				try {
+					marker.setListenerHandler(this);
+					marker.setWorkerID(workerID);
+					
+					synchronized (marker.getProcessingLock()) {
+						if (packet.isServerPacket())
+							listener.onPacketSending(packet);
+						else
+							listener.onPacketReceiving(packet);
+					}
+					
+				} catch (Throwable e) {
+					// Minecraft doesn't want your Exception.
+					filterManager.getLogger().log(Level.SEVERE, 
+							"Unhandled exception occured in onAsyncPacket() for " + getPluginName(), e);
+				}
+				
+				// Now, get the next non-cancelled listener
+				for (; marker.getListenerTraversal().hasNext(); ) {
+					AsyncListenerHandler handler = marker.getListenerTraversal().next().getListener();
+					
+					if (!handler.isCancelled()) {
+						handler.enqueuePacket(packet);
+						continue mainLoop;
+					}
+				}
+				
+				// There are no more listeners - queue the packet for transmission
+				filterManager.signalFreeProcessingSlot(packet);
+				
+				// Note that listeners can opt to delay the packet transmission
+				filterManager.signalPacketTransmission(packet);
+			}
+			
+		} catch (InterruptedException e) {
+			// We're done
+		} finally {
+			// Clean up
+			started.decrementAndGet();
+			close();
+		}
+	}
+	
+	private synchronized void close() {
+		// Remove the listener itself
+		if (!cancelled) {
+			filterManager.unregisterAsyncHandlerInternal(this);
+			cancelled = true;
+			
+			// Tell every uncancelled thread to end
+			stopThreads();
+		}
+	}
+	
+	/**
+	 * Use the poision pill method to stop every worker thread.
+	 */
+	private void stopThreads() {
+		// Poison Pill Shutdown
+		queuedPackets.clear();
+		stop(started.get());
+		
+		// Individual shut down is irrelevant now
+		synchronized (stopLock) {
+			stopLock.notifyAll();
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncMarker.java

@@ -0,0 +1,450 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Iterator;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import net.minecraft.server.Packet;
+
+import com.comphenix.protocol.PacketStream;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.PrioritizedListener;
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.google.common.primitives.Longs;
+
+/**
+ * Contains information about the packet that is being processed by asynchronous listeners.
+ * <p>
+ * Asynchronous listeners can use this to set packet timeout or transmission order.
+ * 
+ * @author Kristian
+ */
+public class AsyncMarker implements Serializable, Comparable<AsyncMarker> {
+		
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = -2621498096616187384L;
+
+	/**
+	 * Default number of milliseconds until a packet will rejected.
+	 */
+	public static final int DEFAULT_TIMEOUT_DELTA = 60000;
+	
+	/**
+	 * Default number of packets to skip.
+	 */
+	public static final int DEFAULT_SENDING_DELTA = 0;
+	
+	/**
+	 * The packet stream responsible for transmitting the packet when it's done processing.
+	 */
+	private transient PacketStream packetStream;
+	
+	/**
+	 * Current list of async packet listeners.
+	 */
+	private transient Iterator<PrioritizedListener<AsyncListenerHandler>> listenerTraversal;
+	
+	// Timeout handling
+	private long initialTime;
+	private long timeout;
+	
+	// Packet order
+	private long originalSendingIndex;
+	private long newSendingIndex;
+	
+	// Used to determine if a packet must be reordered in the sending queue
+	private Long queuedSendingIndex;
+	
+	// Whether or not the packet has been processed by the listeners
+	private volatile boolean processed;
+	
+	// Whether or not the packet has been sent
+	private volatile boolean transmitted;
+	
+	// Whether or not the asynchronous processing itself should be cancelled
+	private volatile boolean asyncCancelled;
+	
+		// Whether or not to delay processing
+	private AtomicInteger processingDelay = new AtomicInteger();
+	
+	// Used to synchronize processing on the shared PacketEvent
+	private Object processingLock = new Object();
+	
+	// Used to identify the asynchronous worker
+	private transient AsyncListenerHandler listenerHandler;
+	private transient int workerID;
+	
+	// Determine if Minecraft processes this packet asynchronously
+	private static Method isMinecraftAsync;
+	private static boolean alwaysSync;
+
+	/**
+	 * Create a container for asyncronous packets.
+	 * @param initialTime - the current time in milliseconds since 01.01.1970 00:00.
+	 */
+	AsyncMarker(PacketStream packetStream, long sendingIndex, long sendingDelta, long initialTime, long timeoutDelta) {
+		if (packetStream == null)
+			throw new IllegalArgumentException("packetStream cannot be NULL");
+		
+		this.packetStream = packetStream;
+		
+		// Timeout
+		this.initialTime = initialTime;
+		this.timeout = initialTime + timeoutDelta;
+		
+		// Sending index
+		this.originalSendingIndex = sendingIndex;
+		this.newSendingIndex = sendingIndex;
+	}
+	
+	/**
+	 * Retrieve the time the packet was initially queued for asynchronous processing.
+	 * @return The initial time in number of milliseconds since 01.01.1970 00:00. 
+	 */
+	public long getInitialTime() {
+		return initialTime;
+	}	
+
+	/**
+	 * Retrieve the time the packet will be forcefully rejected.
+	 * @return The time to reject the packet, in milliseconds since 01.01.1970 00:00.
+	 */
+	public long getTimeout() {
+		return timeout;
+	}
+	
+	/**
+	 * Set the time the packet will be forcefully rejected.
+	 * @param timeout - time to reject the packet, in milliseconds since 01.01.1970 00:00.
+	 */
+	public void setTimeout(long timeout) {
+		this.timeout = timeout;
+	}
+
+	/**
+	 * Retrieve the order the packet was originally transmitted.
+	 * @return The original packet index.
+	 */
+	public long getOriginalSendingIndex() {
+		return originalSendingIndex;
+	}
+
+	/**
+	 * Retrieve the desired sending order after processing has completed.
+	 * <p>
+	 * Higher sending order means lower priority.
+	 * @return Desired sending order.
+	 */
+	public long getNewSendingIndex() {
+		return newSendingIndex;
+	}
+
+	/**
+	 * Sets the desired sending order after processing has completed.
+	 * <p>
+	 * Higher sending order means lower priority.
+	 * @param newSendingIndex - new packet send index.
+	 */
+	public void setNewSendingIndex(long newSendingIndex) {
+		this.newSendingIndex = newSendingIndex;
+	}
+
+	/**
+	 * Retrieve the packet stream responsible for transmitting this packet.
+	 * @return The packet stream.
+	 */
+	public PacketStream getPacketStream() {
+		return packetStream;
+	}
+
+	/**
+	 * Sets the output packet stream responsible for transmitting this packet.
+	 * @param packetStream - new output packet stream.
+	 */
+	public void setPacketStream(PacketStream packetStream) {
+		this.packetStream = packetStream;
+	}
+
+	/**
+	 * Retrieve whether or not this packet has been processed by the async listeners.
+	 * @return TRUE if it has been processed, FALSE otherwise.
+	 */
+	public boolean isProcessed() {
+		return processed;
+	}
+
+	/**
+	 * Sets whether or not this packet has been processed by the async listeners.
+	 * @param processed - TRUE if it has, FALSE otherwise.
+	 */
+	void setProcessed(boolean processed) {
+		this.processed = processed;
+	}
+
+	/**
+	 * Increment the number of times this packet must be signalled as done before its transmitted.
+	 * <p>
+	 * This is useful if an asynchronous listener is waiting for further information before the
+	 * packet can be sent to the user. A packet listener <b>MUST</b> eventually call 
+	 * {@link AsyncFilterManager#signalPacketTransmission(PacketEvent)},
+	 * even if the packet is cancelled, after this method is called. 
+	 * <p>
+	 * It is recommended that processing outside a packet listener is wrapped in a synchronized block 
+	 * using the {@link #getProcessingLock()} method.
+	 * <p>
+	 * To decrement the processing delay, call signalPacketUpdate. A thread that calls this method
+	 * multiple times must call signalPacketUpdate at least that many times.
+	 * @return The new processing delay.
+	 */
+	public int incrementProcessingDelay() {
+		return processingDelay.incrementAndGet();
+	}
+	
+	/**
+	 * Decrement the number of times this packet must be signalled as done before it's transmitted.
+	 * @return The new processing delay. If zero, the packet should be sent.
+	 */
+	int decrementProcessingDelay() {
+		return processingDelay.decrementAndGet();
+	}
+	
+	/**
+	 * Retrieve the number of times a packet must be signalled to be done before it's sent.
+	 * @return Number of processing delays.
+	 */
+	public int getProcessingDelay() {
+		return processingDelay.get();
+	}
+	
+	/**
+	 * Whether or not this packet is or has been queued for processing.
+	 * @return TRUE if it has, FALSE otherwise.
+	 */
+	public boolean isQueued() {
+		return queuedSendingIndex != null;
+	}
+
+	/**
+	 * Retrieve the sending index when the packet was queued.
+	 * @return Queued sending index.
+	 */
+	public long getQueuedSendingIndex() {
+		return queuedSendingIndex != null ? queuedSendingIndex : 0;
+	}
+
+	/**
+	 * Set the sending index when the packet was queued.
+	 * @param queuedSendingIndex - sending index.
+	 */
+	void setQueuedSendingIndex(Long queuedSendingIndex) {
+		this.queuedSendingIndex = queuedSendingIndex;
+	}
+
+	/**
+	 * Processing lock used to synchronize access to the parent PacketEvent and PacketContainer.
+	 * <p>
+	 * This lock is automatically acquired for every asynchronous packet listener. It should only be
+	 * used to synchronize access to a PacketEvent if it's processing has been delayed.
+	 * @return A processing lock.
+	 */
+	public Object getProcessingLock() {
+		return processingLock;
+	}
+
+	public void setProcessingLock(Object processingLock) {
+		this.processingLock = processingLock;
+	}
+
+	/**
+	 * Retrieve whether or not this packet has already been sent.
+	 * @return TRUE if it has been sent before, FALSE otherwise.
+	 */
+	public boolean isTransmitted() {
+		return transmitted;
+	}
+
+	/**
+	 * Determine if this packet has expired.
+	 * @return TRUE if it has, FALSE otherwise.
+	 */
+	public boolean hasExpired() {
+		return hasExpired(System.currentTimeMillis());
+	}
+	
+	/**
+	 * Determine if this packet has expired given this time.
+	 * @param currentTime - the current time in milliseconds since 01.01.1970 00:00.
+	 * @return TRUE if it has, FALSE otherwise.
+	 */
+	public boolean hasExpired(long currentTime) {
+		return timeout < currentTime;
+	}
+	
+	/**
+	 * Determine if the asynchronous handling should be cancelled.
+	 * @return TRUE if it should, FALSE otherwise.
+	 */
+	public boolean isAsyncCancelled() {
+		return asyncCancelled;
+	}
+
+	/**
+	 * Set whether or not the asynchronous handling should be cancelled.
+	 * <p>
+	 * This is only relevant during the synchronous processing. Asynchronous
+	 * listeners should use the normal cancel-field to cancel a PacketEvent.
+	 * 
+	 * @param asyncCancelled - TRUE to cancel it, FALSE otherwise.
+	 */
+	public void setAsyncCancelled(boolean asyncCancelled) {
+		this.asyncCancelled = asyncCancelled;
+	}
+
+	/**
+	 * Retrieve the current asynchronous listener handler.
+	 * @return Asychronous listener handler, or NULL if this packet is not asynchronous.
+	 */
+	public AsyncListenerHandler getListenerHandler() {
+		return listenerHandler;
+	}
+
+	/**
+	 * Set the current asynchronous listener handler. 
+	 * <p>
+	 * Used by the worker to update the value.
+	 * @param listenerHandler - new listener handler.
+	 */
+	void setListenerHandler(AsyncListenerHandler listenerHandler) {
+		this.listenerHandler = listenerHandler;
+	}
+
+	/**
+	 * Retrieve the current worker ID.
+	 * @return Current worker ID.
+	 */
+	public int getWorkerID() {
+		return workerID;
+	}
+
+	/**
+	 * Set the current worker ID.
+	 * <p>
+	 * Used by the worker.
+	 * @param workerID - new worker ID.
+	 */
+	void setWorkerID(int workerID) {
+		this.workerID = workerID;
+	}
+
+	/**
+	 * Retrieve iterator for the next listener in line.
+	 * @return Next async packet listener iterator.
+	 */
+	Iterator<PrioritizedListener<AsyncListenerHandler>> getListenerTraversal() {
+		return listenerTraversal;
+	}
+	
+	/**
+	 * Set the iterator for the next listener.
+	 * @param listenerTraversal - the new async packet listener iterator.
+	 */
+	void setListenerTraversal(Iterator<PrioritizedListener<AsyncListenerHandler>> listenerTraversal) {
+		this.listenerTraversal = listenerTraversal;
+	}
+	
+	/**
+	 * Transmit a given packet to the current packet stream.
+	 * @param event - the packet to send.
+	 * @throws IOException If the packet couldn't be sent.
+	 */
+	void sendPacket(PacketEvent event) throws IOException {
+		try {
+			if (event.isServerPacket()) {
+				packetStream.sendServerPacket(event.getPlayer(), event.getPacket(), false);
+			} else {
+				packetStream.recieveClientPacket(event.getPlayer(), event.getPacket(), false);
+			}
+			transmitted = true;
+			
+		} catch (InvocationTargetException e) {
+			throw new IOException("Cannot send packet", e);
+		} catch (IllegalAccessException e) {
+			throw new IOException("Cannot send packet", e);
+		}
+	}
+	
+	/**
+	 * Determine if Minecraft allows asynchronous processing of this packet.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public boolean isMinecraftAsync(PacketEvent event) throws FieldAccessException {
+		
+		if (isMinecraftAsync == null && !alwaysSync) {
+			try {
+				isMinecraftAsync = FuzzyReflection.fromClass(Packet.class).getMethodByName("a_.*");
+			} catch (RuntimeException e) {
+				// This will occur in 1.2.5 (or possibly in later versions)
+				List<Method> methods = FuzzyReflection.fromClass(Packet.class).
+										getMethodListByParameters(boolean.class, new Class[] {});
+				
+				// Try to look for boolean methods
+				if (methods.size() == 2) {
+					isMinecraftAsync = methods.get(1);
+				} else if (methods.size() == 1) {
+					// We're in 1.2.5
+					alwaysSync = true;
+				} else {
+					System.err.println("Cannot determine asynchronous state of packets!");
+					alwaysSync = true;
+				}
+			}
+		}
+		
+		if (alwaysSync) {
+			return false;
+		} else {
+			try {
+				// Wrap exceptions 
+				return (Boolean) isMinecraftAsync.invoke(event.getPacket().getHandle());
+			} catch (IllegalArgumentException e) {
+				throw new FieldAccessException("Illegal argument", e);
+			} catch (IllegalAccessException e) {
+				throw new FieldAccessException("Unable to reflect method call 'a_', or: isAsyncPacket.", e);
+			} catch (InvocationTargetException e) {
+				throw new FieldAccessException("Minecraft error", e);
+			}
+		}
+	}
+	
+	@Override
+	public int compareTo(AsyncMarker o) {
+		if (o == null)
+			return 1;
+		else
+			return Longs.compare(getNewSendingIndex(), o.getNewSendingIndex());
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/AsyncRunnable.java

@@ -0,0 +1,52 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+/**
+ * A runnable representing a asynchronous event listener.
+ * 
+ * @author Kristian
+ */
+public interface AsyncRunnable extends Runnable {
+	
+	/**
+	 * Retrieve a unique worker ID.
+	 * @return Unique worker ID.
+	 */
+	public int getID();
+	
+	/**
+	 * Stop the given runnable.
+	 * <p>
+	 * This may not occur right away.
+	 * @return TRUE if the thread was stopped, FALSE if it was already stopped.
+	 */
+	public boolean stop() throws InterruptedException;
+	
+	/**
+	 * Determine if we're running or not.
+	 * @return TRUE if we're running, FALSE otherwise.
+	 */
+	public boolean isRunning();
+
+	/**
+	 * Determine if this runnable has already run its course.
+	 * @return TRUE if it has been stopped, FALSE otherwise.
+	 */
+	boolean isFinished();
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/NullPacketListener.java

@@ -0,0 +1,79 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+
+/**
+ * Represents a NO OPERATION listener.
+ * 
+ * @author Kristian
+ */
+class NullPacketListener implements PacketListener {
+	
+	private ListeningWhitelist sendingWhitelist;
+	private ListeningWhitelist receivingWhitelist;
+	private Plugin plugin;
+
+	/**
+	 * Create a no-op listener with the same whitelist and plugin as the given listener.
+	 * @param original - the packet listener to copy.
+	 */
+	public NullPacketListener(PacketListener original) {
+		this.sendingWhitelist = cloneWhitelist(ListenerPriority.LOW, original.getSendingWhitelist());
+		this.receivingWhitelist = cloneWhitelist(ListenerPriority.LOW, original.getReceivingWhitelist());
+		this.plugin = original.getPlugin();
+	}
+
+	@Override
+	public void onPacketSending(PacketEvent event) {
+		// NULL
+	}
+
+	@Override
+	public void onPacketReceiving(PacketEvent event) {
+		// NULL
+	}
+
+	@Override
+	public ListeningWhitelist getSendingWhitelist() {
+		return sendingWhitelist;
+	}
+
+	@Override
+	public ListeningWhitelist getReceivingWhitelist() {
+		return receivingWhitelist;
+	}
+	
+	private ListeningWhitelist cloneWhitelist(ListenerPriority priority, ListeningWhitelist whitelist) {
+		if (whitelist != null) 
+			return new ListeningWhitelist(priority, whitelist.getWhitelist(), whitelist.getGamePhase());
+		else 
+			return null;
+	}
+
+	@Override
+	public Plugin getPlugin() {
+		return plugin;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/PacketEventHolder.java

@@ -0,0 +1,59 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import com.comphenix.protocol.events.PacketEvent;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ComparisonChain;
+
+/**
+ * Provides a comparable to a packet event.
+ * 
+ * @author Kristian
+ */
+class PacketEventHolder implements Comparable<PacketEventHolder> {
+
+	private PacketEvent event;
+	private long sendingIndex = 0;
+	
+	/**
+	 * A wrapper that ensures the packet event is ordered by sending index.
+	 * @param event - packet event to wrap.
+	 */
+	public PacketEventHolder(PacketEvent event) {
+		this.event = Preconditions.checkNotNull(event, "Event must be non-null");
+		
+		if (event.getAsyncMarker() != null)
+			this.sendingIndex = event.getAsyncMarker().getNewSendingIndex();
+	}
+
+	/**
+	 * Retrieve the stored event.
+	 * @return The stored event.
+	 */
+	public PacketEvent getEvent() {
+		return event;
+	}
+	
+	@Override
+	public int compareTo(PacketEventHolder other) {
+		return ComparisonChain.start().
+			   compare(sendingIndex, other.sendingIndex).
+			   result();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/PacketProcessingQueue.java

@@ -0,0 +1,172 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Queue;
+import java.util.concurrent.Semaphore;
+
+import com.comphenix.protocol.concurrency.AbstractConcurrentListenerMultimap;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.PrioritizedListener;
+import com.google.common.collect.MinMaxPriorityQueue;
+
+
+/**
+ * Handles the processing of every packet type.
+ * 
+ * @author Kristian
+ */
+class PacketProcessingQueue extends AbstractConcurrentListenerMultimap<AsyncListenerHandler> {
+
+	// Initial number of elements
+	public static final int INITIAL_CAPACITY = 64;
+	
+	/**
+	 * Default maximum number of packets to process concurrently.
+	 */
+	public static final int DEFAULT_MAXIMUM_CONCURRENCY = 32;
+	
+	/**
+	 * Default maximum number of packets to queue for processing.
+	 */
+	public static final int DEFAULT_QUEUE_LIMIT = 1024 * 60;
+	
+	/**
+	 * Number of packets we're processing concurrently.
+	 */
+	private final int maximumConcurrency;
+	private Semaphore concurrentProcessing;
+	
+	// Queued packets for being processed
+	private Queue<PacketEventHolder> processingQueue;
+	
+	// Packets for sending
+	private PacketSendingQueue sendingQueue;
+
+	public PacketProcessingQueue(PacketSendingQueue sendingQueue) {
+		this(sendingQueue, INITIAL_CAPACITY, DEFAULT_QUEUE_LIMIT, DEFAULT_MAXIMUM_CONCURRENCY);
+	}
+	
+	public PacketProcessingQueue(PacketSendingQueue sendingQueue, int initialSize, int maximumSize, int maximumConcurrency) {
+		super();
+
+		this.processingQueue = Synchronization.queue(MinMaxPriorityQueue.
+				expectedSize(initialSize).
+				maximumSize(maximumSize).
+				<PacketEventHolder>create(), null);
+				
+		this.maximumConcurrency = maximumConcurrency;
+		this.concurrentProcessing = new Semaphore(maximumConcurrency);
+		this.sendingQueue = sendingQueue;
+	}
+	
+	/**
+	 * Enqueue a packet for processing by the asynchronous listeners.
+	 * @param packet - packet to process.
+	 * @param onMainThread - whether or not this is occuring on the main thread.
+	 * @return TRUE if we sucessfully queued the packet, FALSE if the queue ran out if space.
+	 */
+	public boolean enqueue(PacketEvent packet, boolean onMainThread) {
+		try {
+			processingQueue.add(new PacketEventHolder(packet));
+
+			// Begin processing packets
+			signalBeginProcessing(onMainThread);
+			return true;
+		} catch (IllegalStateException e) {
+			return false;
+		}
+	}
+	
+	/**
+	 * Number of packet events in the queue.
+	 * @return The number of packet events in the queue.
+	 */
+	public int size() {
+		return processingQueue.size();
+	}
+	
+	/**
+	 * Called by the current method and each thread to signal that a packet might be ready for processing.
+	 * @param onMainThread - whether or not this is occuring on the main thread.
+	 */
+	public void signalBeginProcessing(boolean onMainThread) {	
+		while (concurrentProcessing.tryAcquire()) {
+			PacketEventHolder holder = processingQueue.poll();
+			
+			// Any packet queued?
+			if (holder != null) {
+				PacketEvent packet = holder.getEvent();
+				AsyncMarker marker = packet.getAsyncMarker();
+				Collection<PrioritizedListener<AsyncListenerHandler>> list = getListener(packet.getPacketID());
+				
+				marker.incrementProcessingDelay();
+				
+				// Yes, removing the marker will cause the chain to stop
+				if (list != null) {
+					Iterator<PrioritizedListener<AsyncListenerHandler>> iterator = list.iterator();
+					
+					if (iterator.hasNext()) {
+						marker.setListenerTraversal(iterator);
+						iterator.next().getListener().enqueuePacket(packet);
+						continue;
+					}
+				}
+				
+				// The packet has no further listeners. Just send it.
+				if (marker.decrementProcessingDelay() == 0)
+					sendingQueue.signalPacketUpdate(packet, onMainThread);
+				signalProcessingDone();
+				
+			} else {
+				// No more queued packets.
+				signalProcessingDone();
+				return;
+			}
+ 		}
+	}
+	
+	/**
+	 * Called when a packet has been processed.
+	 */
+	public void signalProcessingDone() {
+		concurrentProcessing.release();
+	}
+
+	/**
+	 * Retrieve the maximum number of packets to process at any given time.
+	 * @return Number of simultaneous packet to process.
+	 */
+	public int getMaximumConcurrency() {
+		return maximumConcurrency;
+	}
+	
+	public void cleanupAll() {
+		// Cancel all the threads and every listener
+		for (PrioritizedListener<AsyncListenerHandler> handler : values()) {
+			if (handler != null) {
+				handler.getListener().cancel();
+			}
+		}
+		
+		// Remove the rest, just in case
+		clearListeners();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/PacketSendingQueue.java

@@ -0,0 +1,225 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.PriorityBlockingQueue;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.PlayerLoggedOutException;
+import com.comphenix.protocol.reflect.FieldAccessException;
+
+/**
+ * Represents packets ready to be transmitted to a client.
+ * @author Kristian
+ */
+class PacketSendingQueue {
+
+	public static final int INITIAL_CAPACITY = 64;
+	
+	private PriorityBlockingQueue<PacketEventHolder> sendingQueue;
+	
+	// Whether or not packet transmission can only occur on the main thread
+	private final boolean synchronizeMain;
+	
+	/**
+	 * Number of packet events in the queue.
+	 * @return The number of packet events in the queue.
+	 */
+	public int size() {
+		return sendingQueue.size();
+	}
+	
+	/**
+	 * Create a packet sending queue.
+	 * @param synchronizeMain - whether or not to synchronize with the main thread.
+	 */
+	public PacketSendingQueue(boolean synchronizeMain) {
+		this.sendingQueue = new PriorityBlockingQueue<PacketEventHolder>(INITIAL_CAPACITY);
+		this.synchronizeMain = synchronizeMain;
+	}
+	
+	/**
+	 * Enqueue a packet for sending. 
+	 * @param packet - packet to queue.
+	 */
+	public void enqueue(PacketEvent packet) {
+		sendingQueue.add(new PacketEventHolder(packet));
+	}
+	
+	/**
+	 * Invoked when one of the packets have finished processing.
+	 * @param packetUpdated - the packet that has now been updated.
+	 * @param onMainThread - whether or not this is occuring on the main thread.
+	 */
+	public synchronized void signalPacketUpdate(PacketEvent packetUpdated, boolean onMainThread) {
+		
+		AsyncMarker marker = packetUpdated.getAsyncMarker();
+		
+		// Should we reorder the event?
+		if (marker.getQueuedSendingIndex() != marker.getNewSendingIndex()) {
+			PacketEvent copy = PacketEvent.fromSynchronous(packetUpdated, marker);
+			
+			// "Cancel" the original event
+			packetUpdated.setCancelled(true);
+			
+			// Enqueue the copy with the new sending index
+			enqueue(copy);
+		}
+		
+		// Mark this packet as finished
+		marker.setProcessed(true);
+		trySendPackets(onMainThread);
+	}
+
+	/***
+	 * Invoked when a list of packet IDs are no longer associated with any listeners.
+	 * @param packetsRemoved - packets that no longer have any listeners.
+	 * @param onMainThread - whether or not this is occuring on the main thread.
+	 */
+	public synchronized void signalPacketUpdate(List<Integer> packetsRemoved, boolean onMainThread) {
+		
+		Set<Integer> lookup = new HashSet<Integer>(packetsRemoved);
+		
+		// Note that this is O(n), so it might be expensive
+		for (PacketEventHolder holder : sendingQueue) {
+			PacketEvent event = holder.getEvent();
+			
+			if (lookup.contains(event.getPacketID())) {
+				event.getAsyncMarker().setProcessed(true);
+			}
+		}
+		
+		// This is likely to have changed the situation a bit
+		trySendPackets(onMainThread);
+	}
+	
+	/**
+	 * Attempt to send any remaining packets.
+	 * @param onMainThread - whether or not this is occuring on the main thread.
+	 */
+	public void trySendPackets(boolean onMainThread) {
+				
+		// Transmit as many packets as we can
+		while (true) {
+			PacketEventHolder holder = sendingQueue.peek();
+					
+			if (holder != null) {
+				PacketEvent current = holder.getEvent();
+				AsyncMarker marker = current.getAsyncMarker();
+				
+				// Abort if we're not on the main thread
+				if (synchronizeMain) {
+					try {
+						boolean wantAsync = marker.isMinecraftAsync(current);
+						boolean wantSync = !wantAsync;
+						
+						// Quit if we haven't fulfilled our promise
+						if ((onMainThread && wantAsync) || (!onMainThread && wantSync))
+							return;
+						
+					} catch (FieldAccessException e) {
+						e.printStackTrace();
+						return;
+					}
+				}
+				
+				if (marker.isProcessed() || marker.hasExpired()) {
+					if (marker.isProcessed() && !current.isCancelled()) {
+						// Silently skip players that have logged out
+						if (isOnline(current.getPlayer())) {
+							sendPacket(current);
+						}
+					}
+					
+					sendingQueue.poll();
+					continue;
+				}
+			}
+			
+			// Only repeat when packets are removed
+			break;
+		}
+	}
+	
+	private boolean isOnline(Player player) {
+		return player != null && player.isOnline();
+	}
+	
+	/**
+	 * Send every packet, regardless of the processing state.
+	 */
+	private void forceSend() {
+		while (true) {
+			PacketEventHolder holder = sendingQueue.poll();
+			
+			if (holder != null) {
+				sendPacket(holder.getEvent());
+			} else {
+				break;
+			}
+		}
+	}
+	
+	/**
+	 * Whether or not the packet transmission must synchronize with the main thread.
+	 * @return TRUE if it must, FALSE otherwise.
+	 */
+	public boolean isSynchronizeMain() {
+		return synchronizeMain;
+	}
+
+	/**
+	 * Transmit a packet, if it hasn't already.
+	 * @param event - the packet to transmit.
+	 */
+	private void sendPacket(PacketEvent event) {
+		
+		AsyncMarker marker = event.getAsyncMarker();
+		
+		try {
+			// Don't send a packet twice
+			if (marker != null && !marker.isTransmitted()) {
+				marker.sendPacket(event);
+			}
+		
+		} catch (PlayerLoggedOutException e) {
+			System.out.println(String.format(
+					"Warning: Dropped packet index %s of ID %s",
+					marker.getOriginalSendingIndex(), event.getPacketID()
+			));
+			
+		} catch (IOException e) {
+			// Just print the error
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Automatically transmits every delayed packet.
+	 */
+	public void cleanupAll() {
+		// Note that the cleanup itself will always occur on the main thread
+		forceSend();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/async/Synchronization.java

@@ -0,0 +1,228 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.async;
+
+import java.io.Serializable;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Queue;
+
+import javax.annotation.Nullable;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Synchronization views copied from Google Guava.
+ * 
+ * @author Kristian
+ */
+class Synchronization {
+
+	/**
+	 * Create a synchronized wrapper for the given queue.
+	 * <p>
+	 * This wrapper cannot synchronize the iterator(). Callers are expected 
+	 * to synchronize iterators manually.
+	 * @param queue - the queue to synchronize.
+	 * @param mutex - synchronization mutex, or NULL to use the queue.
+	 * @return A synchronization wrapper.
+	 */
+	public static <E> Queue<E> queue(Queue<E> queue, @Nullable Object mutex) {
+		return (queue instanceof SynchronizedQueue) ? 
+				queue : 
+					new SynchronizedQueue<E>(queue, mutex);
+	}
+	
+	private static class SynchronizedObject implements Serializable {
+		private static final long serialVersionUID = -4408866092364554628L;
+
+		final Object delegate;
+		final Object mutex;
+
+		SynchronizedObject(Object delegate, @Nullable Object mutex) {
+			this.delegate = Preconditions.checkNotNull(delegate);
+			this.mutex = (mutex == null) ? this : mutex;
+		}
+
+		Object delegate() {
+			return delegate;
+		}
+
+		// No equals and hashCode; see ForwardingObject for details.
+
+		@Override
+		public String toString() {
+			synchronized (mutex) {
+				return delegate.toString();
+			}
+		}
+	}
+
+	private static class SynchronizedCollection<E> extends SynchronizedObject implements Collection<E> {
+		private static final long serialVersionUID = 5440572373531285692L;
+
+		private SynchronizedCollection(Collection<E> delegate,
+				@Nullable Object mutex) {
+			super(delegate, mutex);
+		}
+
+		@SuppressWarnings("unchecked")
+		@Override
+		Collection<E> delegate() {
+			return (Collection<E>) super.delegate();
+		}
+
+		@Override
+		public boolean add(E e) {
+			synchronized (mutex) {
+				return delegate().add(e);
+			}
+		}
+
+		@Override
+		public boolean addAll(Collection<? extends E> c) {
+			synchronized (mutex) {
+				return delegate().addAll(c);
+			}
+		}
+
+		@Override
+		public void clear() {
+			synchronized (mutex) {
+				delegate().clear();
+			}
+		}
+
+		@Override
+		public boolean contains(Object o) {
+			synchronized (mutex) {
+				return delegate().contains(o);
+			}
+		}
+
+		@Override
+		public boolean containsAll(Collection<?> c) {
+			synchronized (mutex) {
+				return delegate().containsAll(c);
+			}
+		}
+
+		@Override
+		public boolean isEmpty() {
+			synchronized (mutex) {
+				return delegate().isEmpty();
+			}
+		}
+
+		@Override
+		public Iterator<E> iterator() {
+			return delegate().iterator(); // manually synchronized
+		}
+
+		@Override
+		public boolean remove(Object o) {
+			synchronized (mutex) {
+				return delegate().remove(o);
+			}
+		}
+
+		@Override
+		public boolean removeAll(Collection<?> c) {
+			synchronized (mutex) {
+				return delegate().removeAll(c);
+			}
+		}
+
+		@Override
+		public boolean retainAll(Collection<?> c) {
+			synchronized (mutex) {
+				return delegate().retainAll(c);
+			}
+		}
+
+		@Override
+		public int size() {
+			synchronized (mutex) {
+				return delegate().size();
+			}
+		}
+
+		@Override
+		public Object[] toArray() {
+			synchronized (mutex) {
+				return delegate().toArray();
+			}
+		}
+
+		@Override
+		public <T> T[] toArray(T[] a) {
+			synchronized (mutex) {
+				return delegate().toArray(a);
+			}
+		}
+
+	}
+
+	private static class SynchronizedQueue<E> extends SynchronizedCollection<E> implements Queue<E> {
+		private static final long serialVersionUID = 1961791630386791902L;
+
+		SynchronizedQueue(Queue<E> delegate, @Nullable Object mutex) {
+			super(delegate, mutex);
+		}
+
+		@Override
+		Queue<E> delegate() {
+			return (Queue<E>) super.delegate();
+		}
+
+		@Override
+		public E element() {
+			synchronized (mutex) {
+				return delegate().element();
+			}
+		}
+
+		@Override
+		public boolean offer(E e) {
+			synchronized (mutex) {
+				return delegate().offer(e);
+			}
+		}
+
+		@Override
+		public E peek() {
+			synchronized (mutex) {
+				return delegate().peek();
+			}
+		}
+
+		@Override
+		public E poll() {
+			synchronized (mutex) {
+				return delegate().poll();
+			}
+		}
+
+		@Override
+		public E remove() {
+			synchronized (mutex) {
+				return delegate().remove();
+			}
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/concurrency/AbstractConcurrentListenerMultimap.java

@@ -0,0 +1,148 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.concurrency;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.injector.PrioritizedListener;
+import com.google.common.collect.Iterables;
+
+/**
+ * A thread-safe implementation of a listener multimap.
+ * 
+ * @author Kristian
+ */
+public abstract class AbstractConcurrentListenerMultimap<TListener> {
+
+	// The core of our map
+	private ConcurrentMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>> listeners = 
+		new ConcurrentHashMap<Integer, SortedCopyOnWriteArray<PrioritizedListener<TListener>>>();
+	
+	/**
+	 * Adds a listener to its requested list of packet recievers.
+	 * @param listener - listener with a list of packets to recieve notifcations for.
+	 * @param whitelist - the packet whitelist to use.
+	 */
+	public void addListener(TListener listener, ListeningWhitelist whitelist) {
+		
+		PrioritizedListener<TListener> prioritized = new PrioritizedListener<TListener>(listener, whitelist.getPriority());
+		
+		for (Integer packetID : whitelist.getWhitelist()) {
+			addListener(packetID, prioritized);
+		}
+	}
+	
+	// Add the listener to a specific packet notifcation list
+	private void addListener(Integer packetID, PrioritizedListener<TListener> listener) {
+		
+		SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = listeners.get(packetID);
+		
+		// We don't want to create this for every lookup
+		if (list == null) {
+			// It would be nice if we could use a PriorityBlockingQueue, but it doesn't preseve iterator order,
+			// which is a essential feature for our purposes.
+			final SortedCopyOnWriteArray<PrioritizedListener<TListener>> value = new SortedCopyOnWriteArray<PrioritizedListener<TListener>>();
+			
+			list = listeners.putIfAbsent(packetID, value);
+			
+			// We may end up creating multiple multisets, but we'll agree 
+			// on the one to use.
+			if (list == null) {
+				list = value;
+			}
+		}
+		
+		// Thread safe
+		list.add(listener);
+	}
+	
+	/**
+	 * Removes the given listener from the packet event list.
+	 * @param listener - listener to remove.
+	 * @param whitelist - the packet whitelist that was used.
+	 * @return Every packet ID that was removed due to no listeners.
+	 */
+	public List<Integer> removeListener(TListener listener, ListeningWhitelist whitelist) {
+	
+		List<Integer> removedPackets = new ArrayList<Integer>();
+		
+		// Again, not terribly efficient. But adding or removing listeners should be a rare event.
+		for (Integer packetID : whitelist.getWhitelist()) {
+			
+			SortedCopyOnWriteArray<PrioritizedListener<TListener>> list = listeners.get(packetID);
+			
+			// Remove any listeners
+			if (list != null) {
+				// Don't remove from newly created lists
+				if (list.size() > 0) {
+					// Remove this listener. Note that priority is generally ignored.
+					list.remove(new PrioritizedListener<TListener>(listener, whitelist.getPriority()));
+					
+					if (list.size() == 0) {
+						listeners.remove(packetID);
+						removedPackets.add(packetID);
+					}
+				}
+			}
+			
+			// Move on to the next
+		}
+		
+		return removedPackets;
+	}
+	
+	/**
+	 * Retrieve the registered listeners, in order from the lowest to the highest priority.
+	 * <p>
+	 * The returned list is thread-safe and doesn't require synchronization.
+	 * @param packetID - packet ID.
+	 * @return Registered listeners.
+	 */
+	public Collection<PrioritizedListener<TListener>> getListener(int packetID) {
+		return listeners.get(packetID);
+	}
+	
+	/**
+	 * Retrieve every listener.
+	 * @return Every listener.
+	 */
+	public Iterable<PrioritizedListener<TListener>> values() {
+		return Iterables.concat(listeners.values());
+	}
+	
+	/**
+	 * Retrieve every registered packet ID:
+	 * @return Registered packet ID.
+	 */
+	public Set<Integer> keySet() {
+		return listeners.keySet();
+	}
+	
+	/**
+	 * Remove all packet listeners.
+	 */
+	protected void clearListeners() {
+		listeners.clear();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/concurrency/SortedCopyOnWriteArray.java

@@ -0,0 +1,240 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.concurrency;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+
+import com.google.common.base.Objects;
+import com.google.common.collect.Iterables;
+
+/**
+ * An implicitly sorted array list that preserves insertion order and maintains duplicates.
+ * @param <T> - type of the elements in the list.
+ */
+public class SortedCopyOnWriteArray<T extends Comparable<T>> implements Iterable<T>, Collection<T> {
+	// Prevent reordering
+	private volatile List<T> list;
+	
+	/**
+	 * Construct an empty sorted array.
+	 */
+	public SortedCopyOnWriteArray() {
+		list = new ArrayList<T>();
+	}
+	
+	/**
+	 * Create a sorted array from the given list. The elements will be automatically sorted.
+	 * @param wrapped - the collection whose elements are to be placed into the list.
+	 */
+	public SortedCopyOnWriteArray(Collection<T> wrapped) {
+		this.list = new ArrayList<T>(wrapped);
+	}
+	
+	/**
+	 * Create a sorted array from the given list. 
+	 * @param wrapped - the collection whose elements are to be placed into the list.
+	 * @param sort - TRUE to automatically sort the collection, FALSE if it is already sorted. 
+	 */
+	public SortedCopyOnWriteArray(Collection<T> wrapped, boolean sort) {
+		this.list = new ArrayList<T>(wrapped);
+		
+		if (sort) {
+			Collections.sort(list);
+		}
+	}
+	
+	/**
+	 * Inserts the given element in the proper location.
+	 * @param value - element to insert.
+	 */
+	@Override
+	public synchronized boolean add(T value) {
+    	
+    	// We use NULL as a special marker, so we don't allow it
+    	if (value == null)
+    		throw new IllegalArgumentException("value cannot be NULL");
+    	
+    	List<T> copy = new ArrayList<T>();
+
+        for (T element : list) {
+        	// If the value is now greater than the current element, it should be placed right before it
+        	if (value != null && value.compareTo(element) < 0) {
+        		copy.add(value);
+        		value = null;
+        	}
+        	copy.add(element);
+        }
+        
+        // Don't forget to add it
+        if (value != null)
+        	copy.add(value);
+        
+        list = copy;
+        return true;
+    }
+    
+	@Override
+    public synchronized boolean addAll(Collection<? extends T> values) {
+		
+		if (values == null)
+			throw new IllegalArgumentException("values cannot be NULL");
+		if (values.size() == 0)
+			return false;
+		
+    	List<T> copy = new ArrayList<T>();
+    	
+    	// Insert the new content and sort it
+    	copy.addAll(list);
+    	copy.addAll(values);
+    	Collections.sort(copy);
+    	
+    	list = copy;
+    	return true;
+    }
+    
+    /**
+     * Removes from the list by making a new list with every element except the one given.
+     * <p>
+     * Objects will be compared using the given objects equals() method.
+     * @param value - value to remove.
+     */
+	@Override
+    public synchronized boolean remove(Object value) {
+    	List<T> copy = new ArrayList<T>();
+    	
+    	// Note that there's not much to be gained from using BinarySearch, as we
+    	// have to copy (and thus read) the entire list regardless.
+    	
+    	// Copy every element except the one given to us. 
+    	for (T element : list) {
+    		if (value != null && !Objects.equal(value, element)) {
+    			copy.add(element);
+    			value = null;
+    		}
+    	}
+
+    	list = copy;
+    	return value == null;
+    }
+    
+	@Override
+	public boolean removeAll(Collection<?> values) {
+		// Special cases
+		if (values == null)
+			throw new IllegalArgumentException("values cannot be NULL");
+		if (values.size() == 0)
+			return false;
+		
+		List<T> copy = new ArrayList<T>();
+		
+		copy.addAll(list);
+		copy.removeAll(values);
+		
+		list = copy;
+		return true;
+	}
+
+	@Override
+	public boolean retainAll(Collection<?> values) {
+		// Special cases
+		if (values == null)
+			throw new IllegalArgumentException("values cannot be NULL");
+		if (values.size() == 0)
+			return false;
+		
+		List<T> copy = new ArrayList<T>();
+		
+		copy.addAll(list);
+		copy.removeAll(values);
+		
+		list = copy;
+		return true;
+	}
+	
+    /**
+     * Removes from the list by making a copy of every element except the one with the given index.
+     * @param index - index of the element to remove.
+     */
+    public synchronized void remove(int index) {
+    	
+    	List<T> copy = new ArrayList<T>(list);
+    	
+    	copy.remove(index);
+    	list = copy;
+    }
+    
+    /**
+     * Retrieves an element by index. 
+     * @param index - index of element to retrieve.
+     * @return The element at the given location.
+     */
+    public T get(int index) {
+    	return list.get(index);
+    }
+    
+    /**
+     * Retrieve the size of the list.
+     * @return Size of the list.
+     */
+    public int size() {
+    	return list.size();
+    }
+
+    /**
+     * Retrieves an iterator over the elements in the given list. 
+     * Warning: No not attempt to remove elements using the iterator.
+     */
+	public Iterator<T> iterator() {
+		return Iterables.unmodifiableIterable(list).iterator();
+	}
+	
+	@Override
+	public void clear() {
+		list = new ArrayList<T>();
+	}
+
+	@Override
+	public boolean contains(Object value) {
+		return list.contains(value);
+	}
+
+	@Override
+	public boolean containsAll(Collection<?> values) {
+		return list.containsAll(values);
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return list.isEmpty();
+	}
+
+	@Override
+	public Object[] toArray() {
+		return list.toArray();
+	}
+
+	@SuppressWarnings("hiding")
+	@Override
+	public <T> T[] toArray(T[] a) {
+		return list.toArray(a);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/ConnectionSide.java

@@ -0,0 +1,48 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+/**
+ * Used to set a packet filter.
+ * 
+ * @author Kristian
+ */
+public enum ConnectionSide {
+	/**
+	 * Listen for server side packets that will invoke onPacketSending().
+	 */
+	SERVER_SIDE,
+	
+	/**
+	 * Listen for client side packets that will invoke onPacketReceiving().
+	 */
+	CLIENT_SIDE,
+	
+	/**
+	 * Listen for both client and server side packets.
+	 */
+	BOTH;
+	
+	public boolean isForClient() {
+		return this == CLIENT_SIDE || this == BOTH;
+	}
+	
+	public boolean isForServer() {
+		return this == SERVER_SIDE || this == BOTH;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/ListenerPriority.java

@@ -0,0 +1,68 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+/**
+ * Represents a packet event priority, similar to the Bukkit EventPriority.
+ * 
+ * @author Kristian
+ */
+public enum ListenerPriority {
+	/**
+	 * Event call is of very low importance and should be ran first, to allow
+	 * other plugins to further customise the outcome.
+	 */
+	LOWEST(0),
+	/**
+	 * Event call is of low importance.
+	 */
+	LOW(1),
+	/**
+	 * Event call is neither important or unimportant, and may be ran normally.
+	 */
+	NORMAL(2),
+	/**
+	 * Event call is of high importance.
+	 */
+	HIGH(3),
+	/**
+	 * Event call is critical and must have the final say in what happens to the
+	 * event.
+	 */
+	HIGHEST(4),
+	/**
+	 * Event is listened to purely for monitoring the outcome of an event.
+	 * <p/>
+	 * No modifications to the event should be made under this priority.
+	 */
+	MONITOR(5);
+
+	private final int slot;
+
+	private ListenerPriority(int slot) {
+		this.slot = slot;
+	}
+
+	/**
+	 * A low slot represents a low priority.
+	 * @return Integer representation of this priorty.
+	 */
+	public int getSlot() {
+		return slot;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/ListeningWhitelist.java

@@ -0,0 +1,161 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import java.util.Set;
+
+import com.comphenix.protocol.injector.GamePhase;
+import com.google.common.base.Objects;
+import com.google.common.collect.Sets;
+
+/**
+ * Determines which packets will be observed by a listener, and with what priority.
+
+ * @author Kristian 
+ */
+public class ListeningWhitelist {
+
+	/**
+	 * A whitelist with no packets - indicates that the listener shouldn't observe any packets.
+	 */
+	public static final ListeningWhitelist EMPTY_WHITELIST = new ListeningWhitelist(ListenerPriority.LOW);
+	
+	private ListenerPriority priority;
+	private Set<Integer> whitelist;
+	private GamePhase gamePhase;
+
+	/**
+	 * Creates a packet whitelist for a given priority with a set of packet IDs.
+	 * @param priority - the listener priority.
+	 * @param whitelist - set of IDs to observe/enable. 
+	 */
+	public ListeningWhitelist(ListenerPriority priority, Set<Integer> whitelist) {
+		this(priority, whitelist, GamePhase.PLAYING);
+	}
+	
+	/**
+	 * Creates a packet whitelist for a given priority with a set of packet IDs.
+	 * @param priority - the listener priority.
+	 * @param whitelist - set of IDs to observe/enable.
+	 * @param gamePhase - which game phase to receieve notifications on.
+	 */
+	public ListeningWhitelist(ListenerPriority priority, Set<Integer> whitelist, GamePhase gamePhase) {
+		this.priority = priority;
+		this.whitelist = whitelist;
+		this.gamePhase = gamePhase;
+	}
+	
+	/**
+	 * Creates a packet whitelist of a given priority for a list of packets.
+	 * @param priority - the listener priority.
+	 * @param whitelist - list of packet IDs to observe/enable.
+	 */
+	public ListeningWhitelist(ListenerPriority priority, Integer... whitelist) {
+		this.priority = priority;
+		this.whitelist = Sets.newHashSet(whitelist);
+		this.gamePhase = GamePhase.PLAYING;
+	}
+	
+	/**
+	 * Creates a packet whitelist for a given priority with a set of packet IDs.
+	 * @param priority - the listener priority.
+	 * @param whitelist - list of packet IDs to observe/enable.
+	 * @param gamePhase - which game phase to receieve notifications on.
+	 */
+	public ListeningWhitelist(ListenerPriority priority, Integer[] whitelist, GamePhase gamePhase) {
+		this.priority = priority;
+		this.whitelist = Sets.newHashSet(whitelist);
+		this.gamePhase = gamePhase;
+	}
+	
+	/**
+	 * Whether or not this whitelist has any enabled packets.
+	 * @return TRUE if there are any packets, FALSE otherwise.
+	 */
+	public boolean isEnabled() {
+		return whitelist != null && whitelist.size() > 0;
+	}
+	
+	/**
+	 * Retrieve the priority in the execution order of the packet listener. Highest priority will be executed last.
+	 * @return Execution order in terms of priority.
+	 */
+	public ListenerPriority getPriority() {
+		return priority;
+	}
+	
+	/**
+	 * Retrieves the list of packets that will be observed by the listeners.
+	 * @return Packet whitelist.
+	 */
+	public Set<Integer> getWhitelist() {
+		return whitelist;
+	}
+
+	/**
+	 * Retrieve which game phase this listener is active under.
+	 * @return The active game phase.
+	 */
+	public GamePhase getGamePhase() {
+		return gamePhase;
+	}
+	
+	@Override
+	public int hashCode(){
+	    return Objects.hashCode(priority, whitelist, gamePhase);
+	}
+
+	/**
+	 * Determine if any of the given IDs can be found in the whitelist.
+	 * @param whitelist - whitelist to test.
+	 * @param idList - list of packet IDs to find. 
+	 * @return TRUE if any of the packets in the list can be found in the whitelist, FALSE otherwise.
+	 */
+	public static boolean containsAny(ListeningWhitelist whitelist, int... idList) {
+		if (whitelist != null) {
+			for (int i = 0; i < idList.length; i++) {
+				if (whitelist.getWhitelist().contains(idList[i]))
+					return true;
+			}
+		}
+		
+		return false;
+	}
+	
+	@Override
+	public boolean equals(final Object obj){
+	    if(obj instanceof ListeningWhitelist){
+	        final ListeningWhitelist other = (ListeningWhitelist) obj;
+	        return Objects.equal(priority, other.priority)
+	            && Objects.equal(whitelist, other.whitelist);
+	    } else{
+	        return false;
+	    }
+	}
+	
+	@Override
+	public String toString() {
+		if (this == EMPTY_WHITELIST)
+			return "EMPTY_WHITELIST";
+		else
+			return Objects.toStringHelper(this)
+				.add("priority", priority)
+				.add("packets", whitelist).toString();
+	}
+	
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/MonitorAdapter.java

@@ -0,0 +1,81 @@
+package com.comphenix.protocol.events;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.Packets;
+import com.comphenix.protocol.events.ConnectionSide;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.reflect.FieldAccessException;
+
+/**
+ * Represents a listener that is notified of every sent and recieved packet.
+ * 
+ * @author Kristian
+ */
+public abstract class MonitorAdapter implements PacketListener {
+
+	private Plugin plugin;
+	private ListeningWhitelist sending = ListeningWhitelist.EMPTY_WHITELIST;
+	private ListeningWhitelist receiving = ListeningWhitelist.EMPTY_WHITELIST;
+
+	public MonitorAdapter(Plugin plugin, ConnectionSide side) {
+		initialize(plugin, side, getLogger(plugin));
+	}
+	
+	public MonitorAdapter(Plugin plugin, ConnectionSide side, Logger logger) {
+		initialize(plugin, side, logger);
+	}
+	
+	private void initialize(Plugin plugin, ConnectionSide side, Logger logger) {
+		this.plugin = plugin;
+
+		// Recover in case something goes wrong
+		try {
+			if (side.isForServer())
+				this.sending = new ListeningWhitelist(ListenerPriority.MONITOR, Packets.Server.getSupported(), GamePhase.BOTH);
+			if (side.isForClient())
+				this.receiving = new ListeningWhitelist(ListenerPriority.MONITOR, Packets.Client.getSupported(), GamePhase.BOTH);
+		} catch (FieldAccessException e) {
+			if (side.isForServer())
+				this.sending = new ListeningWhitelist(ListenerPriority.MONITOR, Packets.Server.getRegistry().values(), GamePhase.BOTH);
+			if (side.isForClient())
+				this.receiving = new ListeningWhitelist(ListenerPriority.MONITOR, Packets.Client.getRegistry().values(), GamePhase.BOTH);
+			logger.log(Level.WARNING, "Defaulting to 1.3 packets.", e);
+		}
+	}
+	
+	/**
+	 * Retrieve a logger, even if we're running in a CraftBukkit version that doesn't support it.
+	 * @param plugin - the plugin to retrieve.
+	 * @return The logger.
+	 */
+	private Logger getLogger(Plugin plugin) {
+		try {
+			return plugin.getLogger();
+		} catch (NoSuchMethodError e) {
+			return Logger.getLogger("Minecraft");
+		}
+	}
+	
+	@Override
+	public ListeningWhitelist getSendingWhitelist() {
+		return sending;
+	}
+	
+	@Override
+	public ListeningWhitelist getReceivingWhitelist() {
+		return receiving;
+	}
+	
+	@Override
+	public Plugin getPlugin() {
+		return plugin;
+	}
+}
+

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketAdapter.java

@@ -0,0 +1,197 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import java.util.Set;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.injector.GamePhase;
+
+/**
+ * Represents a packet listener with useful constructors.
+ * <p>
+ * Remember to override onPacketReceiving() and onPacketSending(), depending on the ConnectionSide.
+ * @author Kristian
+ */
+public abstract class PacketAdapter implements PacketListener {
+	
+	protected Plugin plugin;
+	protected ConnectionSide connectionSide;
+	protected ListeningWhitelist receivingWhitelist = ListeningWhitelist.EMPTY_WHITELIST;
+	protected ListeningWhitelist sendingWhitelist = ListeningWhitelist.EMPTY_WHITELIST;
+
+	/**
+	 * Initialize a packet listener with default priority.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, Integer... packets) {
+		this(plugin, connectionSide, ListenerPriority.NORMAL, packets);
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, Set<Integer> packets) {
+		this(plugin, connectionSide, listenerPriority, GamePhase.PLAYING, packets.toArray(new Integer[0]));
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * <p>
+	 * The game phase is used to optmize performance. A listener should only choose BOTH or LOGIN if it's absolutely necessary.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param gamePhase - which game phase this listener is active under.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, GamePhase gamePhase, Set<Integer> packets) {
+		this(plugin, connectionSide, ListenerPriority.NORMAL, gamePhase, packets.toArray(new Integer[0]));
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * <p>
+	 * The game phase is used to optmize performance. A listener should only choose BOTH or LOGIN if it's absolutely necessary.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param gamePhase - which game phase this listener is active under.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, GamePhase gamePhase, Set<Integer> packets) {
+		this(plugin, connectionSide, listenerPriority, gamePhase, packets.toArray(new Integer[0]));
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, Integer... packets) {
+		this(plugin, connectionSide, listenerPriority, GamePhase.PLAYING, packets);
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param gamePhase - which game phase this listener is active under.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, GamePhase gamePhase, Integer... packets) {
+		this(plugin, connectionSide, ListenerPriority.NORMAL, GamePhase.PLAYING, packets);
+	}
+	
+	/**
+	 * Initialize a packet listener for a single connection side.
+	 * <p>
+	 * The game phase is used to optmize performance. A listener should only choose BOTH or LOGIN if it's absolutely necessary.
+	 * @param plugin - the plugin that spawned this listener.
+	 * @param connectionSide - the packet type the listener is looking for.
+	 * @param listenerPriority - the event priority.
+	 * @param gamePhase - which game phase this listener is active under.
+	 * @param packets - the packet IDs the listener is looking for.
+	 */
+	public PacketAdapter(Plugin plugin, ConnectionSide connectionSide, ListenerPriority listenerPriority, GamePhase gamePhase, Integer... packets) {
+		if (plugin == null)
+			throw new IllegalArgumentException("plugin cannot be null");
+		if (connectionSide == null)
+			throw new IllegalArgumentException("connectionSide cannot be null");
+		if (listenerPriority == null)
+			throw new IllegalArgumentException("listenerPriority cannot be null");
+		if (gamePhase == null)
+			throw new IllegalArgumentException("gamePhase cannot be NULL");
+		if (packets == null)
+			throw new IllegalArgumentException("packets cannot be null");
+		
+		// Add whitelists
+		if (connectionSide.isForServer())
+			sendingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase);
+		if (connectionSide.isForClient())
+			receivingWhitelist = new ListeningWhitelist(listenerPriority, packets, gamePhase);
+		
+		this.plugin = plugin;
+		this.connectionSide = connectionSide;
+	}
+	
+	@Override
+	public void onPacketReceiving(PacketEvent event) {
+		// Lets prevent some bugs
+		throw new IllegalStateException("Override onPacketReceiving to get notifcations of received packets!");
+	}
+	
+	@Override
+	public void onPacketSending(PacketEvent event) {
+		// Lets prevent some bugs
+		throw new IllegalStateException("Override onPacketSending to get notifcations of sent packets!");
+	}
+	
+	@Override
+	public ListeningWhitelist getReceivingWhitelist() {
+		return receivingWhitelist;
+	}
+	
+	@Override
+	public ListeningWhitelist getSendingWhitelist() {
+		return sendingWhitelist;
+	}
+	
+	@Override
+	public Plugin getPlugin() {
+		return plugin;
+	}
+	
+	/**
+	 * Retrieves the name of the plugin that has been associated with the listener.
+	 * @return Name of the associated plugin.
+	 */
+	public static String getPluginName(PacketListener listener) {
+		
+		Plugin plugin = listener.getPlugin();
+		
+		// Try to get the plugin name
+		try {
+			if (plugin == null)
+				return "UNKNOWN";
+			else
+				return plugin.getName();
+			
+		} catch (NoSuchMethodError e) {
+			return plugin.toString();
+		}
+	}
+	
+	@Override
+	public String toString() {		
+		// This is used by the error reporter 
+		return String.format("PacketAdapter[plugin=%s, sending=%s, receiving=%s]", 
+				getPluginName(this), 
+				sendingWhitelist,
+				receivingWhitelist);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketContainer.java

@@ -0,0 +1,414 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import org.bukkit.World;
+import org.bukkit.WorldType;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import com.comphenix.protocol.injector.StructureCache;
+import com.comphenix.protocol.reflect.EquivalentConverter;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.StructureModifier;
+
+import net.minecraft.server.Packet;
+
+/**
+ * Represents a Minecraft packet indirectly.
+ * 
+ * @author Kristian
+ */
+public class PacketContainer implements Serializable {
+
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = 2074805748222377230L;
+	
+	protected int id;
+	protected transient Packet handle;
+
+	// Current structure modifier
+	protected transient StructureModifier<Object> structureModifier;
+		
+	// Check whether or not certain classes exists
+	private static boolean hasWorldType = false;
+	
+	// The getEntity method
+	private static Method getEntity;
+	
+	// Support for serialization
+	private static Method writeMethod;
+	private static Method readMethod;
+	
+	static {
+		try {
+			Class.forName("net.minecraft.server.WorldType");
+			hasWorldType = true;
+		} catch (ClassNotFoundException e) {
+		}
+	}
+	
+	/**
+	 * Creates a packet container for a new packet.
+	 * @param id - ID of the packet to create.
+	 */
+	public PacketContainer(int id) {
+		this(id, StructureCache.newPacket(id));
+	}
+	
+	/**
+	 * Creates a packet container for an existing packet.
+	 * @param id - ID of the given packet.
+	 * @param handle - contained packet.
+	 */
+	public PacketContainer(int id, Packet handle) {
+		this(id, handle, StructureCache.getStructure(id).withTarget(handle));
+	}
+	
+	/**
+	 * Creates a packet container for an existing packet.
+	 * @param id - ID of the given packet.
+	 * @param handle - contained packet.
+	 * @param structure - structure modifier.
+	 */
+	public PacketContainer(int id, Packet handle, StructureModifier<Object> structure) {
+		if (handle == null)
+			throw new IllegalArgumentException("handle cannot be null.");
+		
+		this.id = id;
+		this.handle = handle;
+		this.structureModifier = structure;
+	}
+	
+	/**
+	 * Retrieves the underlying Minecraft packet. 
+	 * @return Underlying Minecraft packet.
+	 */
+	public Packet getHandle() {
+		return handle;
+	}
+	
+	/**
+	 * Retrieves the generic structure modifier for this packet.
+	 * @return Structure modifier.
+	 */
+	public StructureModifier<Object> getModifier() {
+		return structureModifier;
+	}
+	
+	/**
+	 * Retrieves a read/write structure for every field with the given type.
+	 * @param primitiveType - the type to find.
+	 * @return A modifier for this specific type.
+	 */
+	public <T> StructureModifier<T> getSpecificModifier(Class<T> primitiveType) {
+		return structureModifier.withType(primitiveType);
+	}
+	
+	/**
+	 * Retrieves a read/write structure for ItemStack.
+	 * <p>
+	 * This modifier will automatically marshall between the Bukkit ItemStack and the
+	 * internal Minecraft ItemStack.
+	 * @return A modifier for ItemStack fields.
+	 */
+	public StructureModifier<ItemStack> getItemModifier() {
+		// Convert to and from the Bukkit wrapper
+		return structureModifier.<ItemStack>withType(net.minecraft.server.ItemStack.class, 
+				getIgnoreNull(new EquivalentConverter<ItemStack>() {
+			public Object getGeneric(ItemStack specific) {
+				return toStackNMS(specific);
+			}
+			
+			@Override
+			public ItemStack getSpecific(Object generic) {
+				return new CraftItemStack((net.minecraft.server.ItemStack) generic);
+			}
+			
+			@Override
+			public Class<ItemStack> getSpecificType() {
+				return ItemStack.class;
+			}
+		}));
+	}
+	
+	/**
+	 * Retrieves a read/write structure for arrays of ItemStacks.
+	 * <p>
+	 * This modifier will automatically marshall between the Bukkit ItemStack and the
+	 * internal Minecraft ItemStack.
+	 * @return A modifier for ItemStack array fields.
+	 */
+	public StructureModifier<ItemStack[]> getItemArrayModifier() {
+		// Convert to and from the Bukkit wrapper
+		return structureModifier.<ItemStack[]>withType(
+				net.minecraft.server.ItemStack[].class, 
+				getIgnoreNull(new EquivalentConverter<ItemStack[]>() {
+					
+			public Object getGeneric(ItemStack[] specific) {
+				net.minecraft.server.ItemStack[] result = new net.minecraft.server.ItemStack[specific.length];
+				
+				// Unwrap every item
+				for (int i = 0; i < result.length; i++) {
+					result[i] = toStackNMS(specific[i]);
+				}
+				return result;
+			}
+			
+			@Override
+			public ItemStack[] getSpecific(Object generic) {
+				net.minecraft.server.ItemStack[] input = (net.minecraft.server.ItemStack[]) generic;
+				ItemStack[] result = new ItemStack[input.length];
+				
+				// Add the wrapper
+				for (int i = 0; i < result.length; i++) {
+					result[i] = new CraftItemStack(input[i]);
+				}
+				return result;
+			}
+			
+			@Override
+			public Class<ItemStack[]> getSpecificType() {
+				return ItemStack[].class;
+			}
+		}));
+	}
+	
+	/**
+	 * Convert an item stack to the NMS equivalent.
+	 * @param stack - Bukkit stack to convert.
+	 * @return A bukkit stack.
+	 */
+	private net.minecraft.server.ItemStack toStackNMS(ItemStack stack) {
+		// We must be prepared for an object that simply implements ItemStcak
+		if (stack instanceof CraftItemStack) {
+			return ((CraftItemStack) stack).getHandle();
+		} else {
+			return (new CraftItemStack(stack)).getHandle();
+		}
+	}
+	
+	/**
+	 * Retrieves a read/write structure for the world type enum.
+	 * <p>
+	 * This modifier will automatically marshall between the Bukkit world type and the
+	 * internal Minecraft world type.
+	 * @return A modifier for world type fields.
+	 */
+	public StructureModifier<WorldType> getWorldTypeModifier() {
+	
+		if (!hasWorldType) {
+			// We couldn't find the Minecraft equivalent
+			return structureModifier.withType(null);
+		}
+		
+		// Convert to and from the Bukkit wrapper
+		return structureModifier.<WorldType>withType(
+				net.minecraft.server.WorldType.class, 
+				getIgnoreNull(new EquivalentConverter<WorldType>() {
+					
+			@Override
+			public Object getGeneric(WorldType specific) {
+				return net.minecraft.server.WorldType.getType(specific.getName());
+			}
+			
+			@Override
+			public WorldType getSpecific(Object generic) {
+				net.minecraft.server.WorldType type = (net.minecraft.server.WorldType) generic;
+				return WorldType.getByName(type.name());
+			}
+			
+			@Override
+			public Class<WorldType> getSpecificType() {
+				return WorldType.class;
+			}
+		}));
+	}
+	
+	/**
+	 * Retrieves a read/write structure for entity objects.
+	 * <p>
+	 * Note that entities are transmitted by integer ID, and the type may not be enough
+	 * to distinguish between entities and other values. Thus, this structure modifier
+	 * MAY return null or invalid entities for certain fields. Using the correct index 
+	 * is essential.
+	 * 
+	 * @return A modifier entity types.
+	 */
+	public StructureModifier<Entity> getEntityModifier(World world) {
+	
+		final Object worldServer = ((CraftWorld) world).getHandle();
+		final Class<?> nmsEntityClass = net.minecraft.server.Entity.class;
+		final World worldCopy = world;
+		
+		if (getEntity == null)
+			getEntity = FuzzyReflection.fromObject(worldServer).getMethodByParameters(
+					"getEntity", nmsEntityClass, new Class[] { int.class });
+		
+		// Convert to and from the Bukkit wrapper
+		return structureModifier.<Entity>withType(
+				int.class, 
+				getIgnoreNull(new EquivalentConverter<Entity>() {
+					
+			@Override
+			public Object getGeneric(Entity specific) {
+				// Simple enough
+				return specific.getEntityId();
+			}
+			
+			@Override
+			public Entity getSpecific(Object generic) {
+				try {
+					net.minecraft.server.Entity nmsEntity = (net.minecraft.server.Entity) 
+							getEntity.invoke(worldServer, generic);
+					Integer id = (Integer) generic;
+					
+					// Attempt to get the Bukkit entity
+					if (nmsEntity != null) {
+						return nmsEntity.getBukkitEntity();
+					} else {
+						// Maybe it's a player that's just logged in? Try a search
+						for (Player player : worldCopy.getPlayers()) {
+							if (player.getEntityId() == id) {
+								return player;
+							}
+						}
+						
+						System.out.println("Entity doesn't exist.");
+						return null;
+					}
+					
+				} catch (IllegalArgumentException e) {
+					throw new RuntimeException("Incorrect arguments detected.", e);
+				} catch (IllegalAccessException e) {
+					throw new RuntimeException("Cannot read field due to a security limitation.", e);
+				} catch (InvocationTargetException e) {
+					throw new RuntimeException("Error occured in Minecraft method.", e.getCause());
+				}
+			}
+			
+			@Override
+			public Class<Entity> getSpecificType() {
+				return Entity.class;
+			}
+		}));
+	}
+	
+	private <TType> EquivalentConverter<TType> getIgnoreNull(final EquivalentConverter<TType> delegate) {
+		// Automatically wrap all parameters to the delegate with a NULL check
+		return new EquivalentConverter<TType>() {
+			public Object getGeneric(TType specific) {
+				if (specific != null)
+					return delegate.getGeneric(specific);
+				else
+					return null;
+			}
+			
+			@Override
+			public TType getSpecific(Object generic) {
+				if (generic != null)
+					return delegate.getSpecific(generic);
+				else
+					return null;
+			}
+			
+			@Override
+			public Class<TType> getSpecificType() {
+				return delegate.getSpecificType();
+			}
+		};
+	}
+
+	/**
+	 * Retrieves the ID of this packet.
+	 * @return Packet ID.
+	 */
+	public int getID() {
+		return id;
+	}
+	
+	private void writeObject(ObjectOutputStream output) throws IOException {
+	    // Default serialization 
+		output.defaultWriteObject();
+
+		// We'll take care of NULL packets as well
+		output.writeBoolean(handle != null);
+		
+		// Retrieve the write method by reflection
+		if (writeMethod == null)
+			writeMethod = FuzzyReflection.fromObject(handle).getMethodByParameters("write", DataOutputStream.class);
+		
+		try {
+			// Call the write-method
+			writeMethod.invoke(handle, new DataOutputStream(output));
+		} catch (IllegalArgumentException e) {
+			throw new IOException("Minecraft packet doesn't support DataOutputStream", e);
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Insufficient security privileges.", e);
+		} catch (InvocationTargetException e) {
+			throw new IOException("Could not serialize Minecraft packet.", e);
+		}
+	}
+
+	private void readObject(ObjectInputStream input) throws ClassNotFoundException, IOException {
+	    // Default deserialization
+		input.defaultReadObject();
+		
+		// Get structure modifier
+		structureModifier = StructureCache.getStructure(id);
+
+	    // Don't read NULL packets
+	    if (input.readBoolean()) {
+	    	
+	    	// Create a default instance of the packet
+	    	handle = StructureCache.newPacket(id);
+	    	
+			// Retrieve the read method by reflection
+			if (readMethod == null)
+				readMethod = FuzzyReflection.fromObject(handle).getMethodByParameters("read", DataInputStream.class);
+	    	
+			// Call the read method
+			try {
+				readMethod.invoke(handle, new DataInputStream(input));
+			} catch (IllegalArgumentException e) {
+				throw new IOException("Minecraft packet doesn't support DataInputStream", e);
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("Insufficient security privileges.", e);
+			} catch (InvocationTargetException e) {
+				throw new IOException("Could not deserialize Minecraft packet.", e);
+			}
+			
+			// And we're done
+			structureModifier = structureModifier.withTarget(handle);
+	    }
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketEvent.java

@@ -0,0 +1,214 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.EventObject;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+
+import com.comphenix.protocol.async.AsyncMarker;
+
+public class PacketEvent extends EventObject implements Cancellable {
+	/**
+	 * Automatically generated by Eclipse.
+	 */
+	private static final long serialVersionUID = -5360289379097430620L;
+
+	private transient Player player;
+	private PacketContainer packet;
+	private boolean serverPacket;
+	private boolean cancel;
+	
+	private AsyncMarker asyncMarker;
+	private boolean asynchronous;
+	
+	/**
+	 * Use the static constructors to create instances of this event.
+	 * @param source - the event source.
+	 */
+	public PacketEvent(Object source) {
+		super(source);
+	}
+
+	private PacketEvent(Object source, PacketContainer packet, Player player, boolean serverPacket) {
+		super(source);
+		this.packet = packet;
+		this.player = player;
+		this.serverPacket = serverPacket;
+	}
+	
+	private PacketEvent(PacketEvent origial, AsyncMarker asyncMarker) {
+		super(origial.source);
+		this.packet = origial.packet;
+		this.player = origial.player;
+		this.cancel = origial.cancel;
+		this.serverPacket = origial.serverPacket;
+		this.asyncMarker = asyncMarker;
+		this.asynchronous = true;
+	}
+
+	/**
+	 * Creates an event representing a client packet transmission.
+	 * @param source - the event source.
+	 * @param packet - the packet.
+	 * @param client - the client that sent the packet.
+	 * @return The event.
+	 */
+	public static PacketEvent fromClient(Object source, PacketContainer packet, Player client) {
+		return new PacketEvent(source, packet, client, false);
+	}
+	
+	/**
+	 * Creates an event representing a server packet transmission.
+	 * @param source - the event source.
+	 * @param packet - the packet.
+	 * @param recipient - the client that will receieve the packet.
+	 * @return The event.
+	 */
+	public static PacketEvent fromServer(Object source,  PacketContainer packet, Player recipient) {
+		return new PacketEvent(source, packet, recipient, true);
+	}
+	
+	/**
+	 * Create an asynchronous packet event from a synchronous event and a async marker.
+	 * @param event - the original synchronous event.
+	 * @param marker - the asynchronous marker.
+	 * @return The new packet event.
+	 */
+	public static PacketEvent fromSynchronous(PacketEvent event, AsyncMarker marker) {
+		return new PacketEvent(event, marker);
+	}
+	
+	/**
+	 * Retrieves the packet that will be sent to the player.
+	 * @return Packet to send to the player.
+	 */
+	public PacketContainer getPacket() {
+		return packet;
+	}
+
+	/**
+	 * Replace the packet that will be sent to the player.
+	 * @param packet - the packet that will be sent instead.
+	 */
+	public void setPacket(PacketContainer packet) {
+		this.packet = packet;
+	}
+
+	/**
+	 * Retrieves the packet ID.
+	 * @return The current packet ID.
+	 */
+	public int getPacketID() {
+		return packet.getID();
+	}
+	
+	/**
+	 * Retrieves whether or not the packet should be cancelled.
+	 * @return TRUE if it should be cancelled, FALSE otherwise.
+	 */
+	public boolean isCancelled() {
+		return cancel;
+	}
+
+	/**
+	 * Sets whether or not the packet should be cancelled.
+	 * @param cancel - TRUE if it should be cancelled, FALSE otherwise.
+	 */
+	public void setCancelled(boolean cancel) {
+		this.cancel = cancel;
+	}
+
+	/**
+	 * Retrieves the player that has sent the packet or is recieving it.
+	 * @return The player associated with this event.
+	 */
+	public Player getPlayer() {
+		return player;
+	}
+	
+	/**
+	 * Whether or not this packet was created by the server.
+	 * <p>
+	 * Most listeners can deduce this by noting which listener method was invoked.
+	 * @return TRUE if the packet was created by the server, FALSE if it was created by a client.
+	 */
+	public boolean isServerPacket() {
+		return serverPacket;
+	}
+	
+	/**
+	 * Retrieve the asynchronous marker.
+	 * <p>
+	 * If the packet is synchronous, this marker will be used to schedule an asynchronous event. In the following
+	 * asynchronous event, the marker is used to correctly pass the packet around to the different threads.
+	 * <p>
+	 * Note that if there are no asynchronous events that can receive this packet, the marker is NULL.
+	 * @return The current asynchronous marker, or NULL.
+	 */
+	public AsyncMarker getAsyncMarker() {
+		return asyncMarker;
+	}
+	/**
+	 * Set the asynchronous marker. 
+	 * <p>
+	 * If the marker is non-null at the end of an synchronous event processing, the packet will be scheduled
+	 * to be processed asynchronously with the given settings.
+	 * <p>
+	 * Note that if there are no asynchronous events that can receive this packet, the marker should be NULL. 
+	 * @param asyncMarker - the new asynchronous marker, or NULL.
+	 * @throws IllegalStateException If the current event is asynchronous.
+	 */
+	public void setAsyncMarker(AsyncMarker asyncMarker) {
+		if (isAsynchronous())
+			throw new IllegalStateException("The marker is immutable for asynchronous events");
+		this.asyncMarker = asyncMarker;
+	}
+
+	/**
+	 * Determine if the packet event has been executed asynchronously or not.
+	 * @return TRUE if this packet event is asynchronous, FALSE otherwise.
+	 */
+	public boolean isAsynchronous() {
+		return asynchronous;
+	}
+	
+	private void writeObject(ObjectOutputStream output) throws IOException {
+	    // Default serialization 
+		output.defaultWriteObject();
+
+		// Write the name of the player (or NULL if it's not set)
+		output.writeObject(player != null ? new SerializedOfflinePlayer(player) : null);
+	}
+
+	private void readObject(ObjectInputStream input) throws ClassNotFoundException, IOException {
+	    // Default deserialization
+		input.defaultReadObject();
+
+		final SerializedOfflinePlayer offlinePlayer = (SerializedOfflinePlayer) input.readObject();
+		
+	    if (offlinePlayer != null) {
+	    	// Better than nothing
+	    	player = offlinePlayer.getPlayer();
+	    }
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/PacketListener.java

@@ -0,0 +1,69 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import org.bukkit.plugin.Plugin;
+
+/**
+ * Represents a listener that recieves notifications when packets are sent or recieved.
+ * <p>
+ * Use {@link PacketAdapter} for a simple wrapper around this interface.
+ * @author Kristian
+ */
+public interface PacketListener {
+	
+	/**
+	 * Invoked right before a packet is transmitted from the server to the client.
+	 * <p>
+	 * Note that the packet may be replaced, if needed.
+	 * <p>
+	 * This method is executed on the main thread, and thus the Bukkit API is safe to use.
+	 * 
+	 * @param event - the packet that should be sent.
+	 */
+	public void onPacketSending(PacketEvent event);
+
+	/**
+	 * Invoked right before a recieved packet from a client is being processed.
+	 * <p>
+	 * <b>WARNING</b>: </br> 
+	 * This method will be called <i>asynchronously</i>! You should synchronize with the main 
+	 * thread using {@link org.bukkit.scheduler.BukkitScheduler#scheduleSyncDelayedTask(Plugin, Runnable, long) scheduleSyncDelayedTask} 
+	 * if you need to call the Bukkit API.
+	 * @param event - the packet that has been recieved.
+	 */
+	public void onPacketReceiving(PacketEvent event);
+	
+	/**
+	 * Retrieve which packets sent by the server this listener will observe.
+	 * @return List of server packets to observe, along with the priority.
+	 */
+	public ListeningWhitelist getSendingWhitelist();
+	
+	/**
+	 * Retrieve which packets sent by the client this listener will observe.
+	 * @return List of server packets to observe, along with the priority.
+	 */
+	public ListeningWhitelist getReceivingWhitelist();
+	
+	/**
+	 * Retrieve the plugin that created list packet listener.
+	 * @return The plugin, or NULL if not available.
+	 */
+	public Plugin getPlugin();
+}

ProtocolLib/src/main/java/com/comphenix/protocol/events/SerializedOfflinePlayer.java

@@ -0,0 +1,233 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.events;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.World;
+import org.bukkit.entity.Player;
+
+/**
+ * Represents a player object that can be serialized by Java.
+ * 
+ * @author Kristian
+ */
+class SerializedOfflinePlayer implements OfflinePlayer, Serializable {
+
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = -2728976288470282810L;
+
+	private transient Location bedSpawnLocation;
+	
+	// Relevant data about an offline player
+	private String name;
+	private long firstPlayed;
+	private long lastPlayed;
+	private boolean operator;
+	private boolean banned;
+	private boolean playedBefore;
+	private boolean online;
+	private boolean whitelisted;
+	
+	// Proxy helper
+	private static Map<String, Method> lookup = new ConcurrentHashMap<String, Method>();
+
+	/**
+	 * Constructor used by serialization.
+	 */
+	public SerializedOfflinePlayer() {
+		// Do nothing
+	}
+	
+	/**
+	 * Initialize this serializable offline player from another player.
+	 * @param offline - another player.
+	 */
+	public SerializedOfflinePlayer(OfflinePlayer offline) {
+		this.name = offline.getName();
+		this.firstPlayed = offline.getFirstPlayed();
+		this.lastPlayed = offline.getLastPlayed();
+		this.operator = offline.isOp();
+		this.banned = offline.isBanned();
+		this.playedBefore = offline.hasPlayedBefore();
+		this.online = offline.isOnline();
+		this.whitelisted = offline.isWhitelisted();
+	}
+	
+	@Override
+	public boolean isOp() {
+		return operator;
+	}
+
+	@Override
+	public void setOp(boolean operator) {
+		this.operator = operator;
+	}
+
+	@Override
+	public Map<String, Object> serialize() {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public Location getBedSpawnLocation() {
+		return bedSpawnLocation;
+	}
+
+	@Override
+	public long getFirstPlayed() {
+		return firstPlayed;
+	}
+
+	@Override
+	public long getLastPlayed() {
+		return lastPlayed;
+	}
+
+	@Override
+	public String getName() {
+		return name;
+	}
+	
+	@Override
+	public boolean hasPlayedBefore() {
+		return playedBefore;
+	}
+
+	@Override
+	public boolean isBanned() {
+		return banned;
+	}
+
+	@Override
+	public void setBanned(boolean banned) {
+		this.banned = banned;
+	}
+	
+	@Override
+	public boolean isOnline() {
+		return online;
+	}
+
+	@Override
+	public boolean isWhitelisted() {
+		return whitelisted;
+	}
+
+	@Override
+	public void setWhitelisted(boolean whitelisted) {
+		this.whitelisted = whitelisted;
+	}
+
+	private void writeObject(ObjectOutputStream output) throws IOException {
+		output.defaultWriteObject();
+		
+		// Serialize the bed spawn location
+		output.writeUTF(bedSpawnLocation.getWorld().getName());
+		output.writeDouble(bedSpawnLocation.getX());
+		output.writeDouble(bedSpawnLocation.getY());
+		output.writeDouble(bedSpawnLocation.getZ());
+	}
+	
+	private void readObject(ObjectInputStream input) throws ClassNotFoundException, IOException {
+		input.defaultReadObject();
+
+		// Well, this is a problem
+		bedSpawnLocation = new Location(
+				getWorld(input.readUTF()),
+				input.readDouble(),
+				input.readDouble(),
+				input.readDouble()
+		);
+	}
+	
+	private World getWorld(String name) {
+		try {
+			// Try to get the world at least
+			return Bukkit.getServer().getWorld(name);
+		} catch (Exception e) {
+			// Screw it
+			return null;
+		}
+	}
+	
+	@Override
+	public Player getPlayer() {
+		try {
+			// Try to get the real player underneath
+			return Bukkit.getServer().getPlayerExact(name);
+		} catch (Exception e) {
+			return getProxyPlayer();
+		}
+	}
+	
+	/**
+	 * Retrieve a player object that implements OfflinePlayer by refering to this object. 
+	 * <p>
+	 * All other methods cause an exception.
+	 * @return Proxy object.
+	 */
+	public Player getProxyPlayer() {
+		
+		// Remember to initialize the method filter
+		if (lookup.size() == 0) {
+			// Add all public methods
+			for (Method method : OfflinePlayer.class.getMethods()) {
+				lookup.put(method.getName(), method);
+			}
+		}
+		
+    	// MORE CGLIB magic!
+    	Enhancer ex = new Enhancer();
+    	ex.setSuperclass(Player.class);
+    	ex.setCallback(new MethodInterceptor() {
+			@Override
+			public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+				
+				// There's no overloaded methods, so we don't care
+				Method offlineMethod = lookup.get(method.getName());
+				
+				// Ignore all other methods
+				if (offlineMethod == null) {
+					throw new UnsupportedOperationException(
+							"The method " + method.getName() + " is not supported for offline players.");
+				}
+
+				// Invoke our on method
+				return offlineMethod.invoke(SerializedOfflinePlayer.this, args);
+			}
+    	});
+    	
+    	return (Player) ex.create();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/BukkitUnwrapper.java

@@ -0,0 +1,115 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Collection;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import com.comphenix.protocol.injector.PacketConstructor.Unwrapper;
+import com.comphenix.protocol.reflect.instances.DefaultInstances;
+
+/**
+ * Represents an object capable of converting wrapped Bukkit objects into NMS objects.
+ * <p>
+ * Typical conversions include:
+ * <ul>
+ * <li>org.bukkit.entity.Player -> net.minecraft.server.EntityPlayer</li>
+ * <li>org.bukkit.World -> net.minecraft.server.WorldServer</li>
+ * </ul>
+ * 
+ * @author Kristian
+ */
+public class BukkitUnwrapper implements Unwrapper {
+	
+	private static Map<Class<?>, Method> cache = new ConcurrentHashMap<Class<?>, Method>();
+
+	@SuppressWarnings("unchecked")
+	@Override
+	public Object unwrapItem(Object wrappedObject) {
+
+		// Special cases
+		if (wrappedObject == null) {
+			return null;
+		} else if (wrappedObject instanceof Collection) {
+			return handleCollection((Collection<Object>) wrappedObject);
+		}
+		
+		Class<?> currentClass = wrappedObject.getClass();
+		Method cachedMethod = initializeCache(currentClass);
+		
+		try {
+			// Retrieve the handle
+			if (cachedMethod != null)
+				return cachedMethod.invoke(wrappedObject);
+			else
+				return null;
+			
+		} catch (IllegalArgumentException e) {
+			// Impossible
+			return null;
+		} catch (IllegalAccessException e) {
+			return null;
+		} catch (InvocationTargetException e) {
+			// This is REALLY bad
+			throw new RuntimeException("Minecraft error.", e);
+		}
+	}
+	
+	private Object handleCollection(Collection<Object> wrappedObject) {
+		
+		@SuppressWarnings("unchecked")
+		Collection<Object> copy = DefaultInstances.DEFAULT.getDefault(wrappedObject.getClass());
+		
+		if (copy != null) {
+			// Unwrap every element
+			for (Object element : wrappedObject) {
+				copy.add(unwrapItem(element));
+			}
+			return copy;
+			
+		} else {
+			// Impossible
+			return null;
+		}
+	}
+	
+	private Method initializeCache(Class<?> type) {
+		
+		// See if we're already determined this
+		if (cache.containsKey(type)) {
+			// We will never remove from the cache, so this ought to be thread safe
+			return cache.get(type);
+		}
+		
+		try {
+			Method find = type.getMethod("getHandle");
+			
+			// It's thread safe, as getMethod should return the same handle 
+			cache.put(type, find);
+			return find;
+			
+		} catch (SecurityException e) {
+			return null;
+		} catch (NoSuchMethodException e) {
+			return null;
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/DelayedSingleTask.java

@@ -0,0 +1,132 @@
+package com.comphenix.protocol.injector;
+
+import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitScheduler;
+
+/**
+ * Represents a single delayed task.
+ * 
+ * @author Kristian
+ */
+public class DelayedSingleTask {
+
+	protected int taskID = -1;
+	protected Plugin plugin;
+	protected BukkitScheduler scheduler;
+	protected boolean closed;
+	
+	/**
+	 * Create a single task scheduler.
+	 * @param plugin - owner plugin.
+	 */
+	public DelayedSingleTask(Plugin plugin) {
+		this.plugin = plugin;
+		this.scheduler = plugin.getServer().getScheduler();
+	}
+	
+	/**
+	 * Create a single task scheduler.
+	 * @param plugin - owner plugin.
+	 * @param scheduler - specialized scheduler.
+	 */
+	public DelayedSingleTask(Plugin plugin, BukkitScheduler scheduler) {
+		this.plugin = plugin;
+		this.scheduler = scheduler;
+	}
+
+	/**
+	 * Schedule a single task for execution. 
+	 * <p>
+	 * Any previously scheduled task will be automatically cancelled.
+	 * <p>
+	 * Note that a tick delay of zero will execute the task immediately. 
+	 * 
+	 * @param ticksDelay - number of ticks before the task is executed.
+	 * @param task - the task to schedule.
+	 * @return TRUE if the task was successfully scheduled or executed, FALSE otherwise.
+	 */
+	public boolean schedule(long ticksDelay, Runnable task) {
+		if (ticksDelay < 0)
+			throw new IllegalArgumentException("Tick delay cannot be negative.");
+		if (task == null)
+			throw new IllegalArgumentException("task cannot be NULL");
+		if (closed)
+			return false;
+		
+		// Special case
+		if (ticksDelay == 0) {
+			task.run();
+			return true;
+		}
+		
+		// Boilerplate, boilerplate
+		final Runnable dispatch = task;
+		
+		// Don't run multiple tasks!
+		cancel();
+		taskID = scheduler.scheduleSyncDelayedTask(plugin, new Runnable() {
+			@Override
+			public void run() {
+				dispatch.run();
+				taskID = -1;
+			}
+		}, ticksDelay);
+		
+		return isRunning();
+	}
+
+	/**
+	 * Whether or not a future task is scheduled to be executed.
+	 * @return TRUE if a current task has been scheduled for execution, FALSE otherwise.
+	 */
+	public boolean isRunning() {
+		return taskID >= 0;
+	}
+	
+	/**
+	 * Cancel a future task from being executed.
+	 * @return TRUE if a task was cancelled, FALSE otherwise.
+	 */
+	public boolean cancel() {
+		if (isRunning()) {
+			scheduler.cancelTask(taskID);
+			taskID = -1;
+			return true;
+		} else {
+			return false;
+		}
+	}
+	
+	/**
+	 * Retrieve the raw task ID.
+	 * @return Raw task ID, or negative one if no task has been scheduled.
+	 */
+	public int getTaskID() {
+		return taskID;
+	}
+
+	/**
+	 * Retrieve the plugin this task belongs to.
+	 * @return The plugin scheduling the current taks.
+	 */
+	public Plugin getPlugin() {
+		return plugin;
+	}
+	
+	/**
+	 * Stop the current task and all future tasks scheduled by this instance.
+	 */
+	public synchronized void close() {
+		if (!closed) {
+			cancel();
+			plugin = null;
+			scheduler = null;
+			closed = true;
+		}
+	}
+	
+	@Override
+	protected void finalize() throws Throwable {
+		close();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/EntityUtilities.java

@@ -0,0 +1,206 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import org.bukkit.World;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.google.common.collect.Lists;
+
+/**
+ * Used to perform certain operations on entities.
+ * 
+ * @author Kristian
+ */
+class EntityUtilities {
+
+	private static Field entityTrackerField;
+	private static Field trackedEntitiesField;
+	private static Field trackedPlayersField;
+	
+	private static Method hashGetMethod;
+	private static Method scanPlayersMethod;
+	
+	/*
+	 * While this function may look pretty bad, it's essentially just a reflection-warped 
+	 * version of the following:
+	 * 
+	 *  	@SuppressWarnings("unchecked")
+	 *	 	public static void updateEntity2(Entity entity, List<Player> observers) {
+	 *
+	 *			World world = entity.getWorld();
+	 *			WorldServer worldServer = ((CraftWorld) world).getHandle();
+	 *
+	 *			EntityTracker tracker = worldServer.tracker;
+	 *			EntityTrackerEntry entry = (EntityTrackerEntry) tracker.trackedEntities.get(entity.getEntityId());
+	 *
+	 *			List<EntityPlayer> nmsPlayers = getNmsPlayers(observers);
+	 *
+	 *			entry.trackedPlayers.removeAll(nmsPlayers);
+	 *			entry.scanPlayers(nmsPlayers);
+	 *		}
+	 *
+	 *		private static List<EntityPlayer> getNmsPlayers(List<Player> players) {
+	 *			List<EntityPlayer> nsmPlayers = new ArrayList<EntityPlayer>();
+	 *	
+	 *			for (Player bukkitPlayer : players) {
+	 *				CraftPlayer craftPlayer = (CraftPlayer) bukkitPlayer;
+	 *				nsmPlayers.add(craftPlayer.getHandle());
+	 *			}
+	 *	
+	 *			return nsmPlayers;
+	 *		}
+	 *
+	 */
+	public static void updateEntity(Entity entity, List<Player> observers) throws FieldAccessException {
+		
+		World world = entity.getWorld();
+		Object worldServer = ((CraftWorld) world).getHandle();
+
+		// We have to rely on the class naming here.
+		if (entityTrackerField == null)
+			entityTrackerField = FuzzyReflection.fromObject(worldServer).getFieldByType(".*Tracker");
+		
+		// Get the tracker
+		Object tracker = null;
+		
+		try {
+			tracker = FieldUtils.readField(entityTrackerField, worldServer, false);
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot access 'tracker' field due to security limitations.", e);
+		}
+		
+		if (trackedEntitiesField == null) {
+			@SuppressWarnings("rawtypes")
+			Set<Class> ignoredTypes = new HashSet<Class>();
+			
+			// Well, this is more difficult. But we're looking for a Minecraft object that is not 
+			// created by the constructor(s).
+			for (Constructor<?> constructor : tracker.getClass().getConstructors()) {
+				for (Class<?> type : constructor.getParameterTypes()) {
+					ignoredTypes.add(type);
+				}
+			}
+			
+			// The Minecraft field that's NOT filled in by the constructor
+			trackedEntitiesField = FuzzyReflection.fromObject(tracker, true).
+						getFieldByType(FuzzyReflection.MINECRAFT_OBJECT, ignoredTypes);
+		}
+		
+		// Read the entity hashmap
+		Object trackedEntities = null;
+
+		try {
+			trackedEntities = FieldUtils.readField(trackedEntitiesField, tracker, true);
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot access 'trackedEntities' field due to security limitations.", e);
+		}
+		
+		// Getting the "get" method is pretty hard, but first - try to just get it by name
+		if (hashGetMethod == null) {
+			
+			Class<?> type = trackedEntities.getClass();
+			
+			try {
+				hashGetMethod = type.getMethod("get", int.class);
+			} catch (NoSuchMethodException e) {
+			
+				Class<?>[] params = { int.class };
+				
+				// Then it's probably the lowest named method that takes an int-parameter
+				for (Method method : type.getMethods()) {
+					if (Arrays.equals(params, method.getParameterTypes())) {
+						if (hashGetMethod == null ||
+							method.getName().compareTo(hashGetMethod.getName()) < 0) {
+							hashGetMethod = method;
+						}
+					}
+				}
+			}
+		}
+	
+		try {
+			//EntityTrackerEntry trackEntity = (EntityTrackerEntry) tracker.trackedEntities.get(entity.getEntityId());
+			 Object trackerEntry = hashGetMethod.invoke(trackedEntities, entity.getEntityId());
+
+			if (trackedPlayersField == null) {
+				// This one is fairly easy
+				trackedPlayersField = FuzzyReflection.fromObject(trackerEntry).getFieldByType("java\\.util\\..*");
+			}
+			
+			// Phew, finally there.
+			Collection<?> trackedPlayers = (Collection<?>) FieldUtils.readField(trackedPlayersField, trackerEntry, false);
+			List<Object> nmsPlayers = unwrapBukkit(observers);
+			
+			// trackEntity.trackedPlayers.clear();
+			trackedPlayers.removeAll(nmsPlayers);
+			
+			// We have to rely on a NAME once again. Damn it.
+			if (scanPlayersMethod == null) {
+				scanPlayersMethod = trackerEntry.getClass().getMethod("scanPlayers", List.class);
+			}
+			
+			//trackEntity.scanPlayers(server.players);
+			scanPlayersMethod.invoke(trackerEntry, nmsPlayers);
+			
+		} catch (IllegalArgumentException e) {
+			throw e;
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Security limitation prevents access to 'get' method in IntHashMap", e);
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Exception occurred in Minecraft.", e);
+		} catch (SecurityException e) {
+			throw new FieldAccessException("Security limitation prevents access to 'scanPlayers' method in trackerEntry.", e);
+		} catch (NoSuchMethodException e) {
+			throw new FieldAccessException("Canot find 'scanPlayers' method. Is ProtocolLib up to date?", e);
+		}
+	}
+	
+	private static List<Object> unwrapBukkit(List<Player> players) {
+		
+		List<Object> output = Lists.newArrayList();
+		BukkitUnwrapper unwrapper = new BukkitUnwrapper();
+		
+		// Get the NMS equivalent
+		for (Player player : players) {
+			Object result = unwrapper.unwrapItem(player);
+			
+			if (result != null)
+				output.add(result);
+			else
+				throw new IllegalArgumentException("Cannot unwrap item " + player);
+		}
+		
+		return output;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/GamePhase.java

@@ -0,0 +1,39 @@
+package com.comphenix.protocol.injector;
+
+/**
+ * The current player phase. This is used to limit the number of different injections.
+ * 
+ * @author Kristian
+ */
+public enum GamePhase {
+	/**
+	 * Only listen for packets sent or received before a player has logged in.
+	 */
+	LOGIN,
+	
+	/**
+	 * Only listen for packets sent or received after a player has logged in.
+	 */
+	PLAYING,
+	
+	/**
+	 * Listen for every sent and received packet.
+	 */
+	BOTH;
+	
+	/**
+	 * Determine if the current value represents the login phase.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public boolean hasLogin() {
+		return this == LOGIN || this == BOTH;
+	}
+	
+	/**
+	 * Determine if the current value represents the playing phase.
+	 * @return TRUE if it does, FALSE otherwise.
+	 */
+	public boolean hasPlaying() {
+		return this == PLAYING || this == BOTH;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/ListenerInvoker.java

@@ -0,0 +1,49 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import net.minecraft.server.Packet;
+
+import com.comphenix.protocol.events.PacketEvent;
+
+/**
+ * Represents an object that initiate the packet listeners.
+ * 
+ * @author Kristian
+ */
+public interface ListenerInvoker {
+
+	/**
+	 * Invokes the given packet event for every registered listener.
+	 * @param event - the packet event to invoke.
+	 */
+	public abstract void invokePacketRecieving(PacketEvent event);
+
+	/**
+	 * Invokes the given packet event for every registered listener.
+	 * @param event - the packet event to invoke.
+	 */
+	public abstract void invokePacketSending(PacketEvent event);
+
+	/**
+	 * Retrieve the associated ID of a packet.
+	 * @param packet - the packet.
+	 * @return The packet ID.
+	 */
+	public abstract int getPacketID(Packet packet);
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/MinecraftRegistry.java

@@ -0,0 +1,181 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import net.minecraft.server.Packet;
+
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.google.common.base.Objects;
+import com.google.common.collect.ImmutableSet;
+
+/**
+ * Static registries in Minecraft.
+ * 
+ * @author Kristian
+ */
+@SuppressWarnings("rawtypes")
+class MinecraftRegistry {
+
+	// Fuzzy reflection
+	private static FuzzyReflection packetRegistry;
+	
+	// The packet class to packet ID translator
+	private static Map<Class, Integer> packetToID;
+	
+	// Whether or not certain packets are sent by the client or the server
+	private static Set<Integer> serverPackets;
+	private static Set<Integer> clientPackets;
+	
+	// New proxy values
+	private static Map<Integer, Class> overwrittenPackets = new HashMap<Integer, Class>();
+	
+	// Vanilla packets
+	private static Map<Integer, Class> previousValues = new HashMap<Integer, Class>();
+	
+	@SuppressWarnings({ "unchecked" })
+	public static Map<Class, Integer> getPacketToID() {
+		// Initialize it, if we haven't already
+		if (packetToID == null) {
+			try {
+				Field packetsField = getPacketRegistry().getFieldByType("packetsField", Map.class);
+				packetToID = (Map<Class, Integer>) FieldUtils.readStaticField(packetsField, true);
+				
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("Unable to retrieve the packetClassToIdMap", e);
+			}
+		}
+		
+		return packetToID;
+	}
+	
+	/**
+	 * Retrieve the cached fuzzy reflection instance allowing access to the packet registry.
+	 * @return Reflected packet registry.
+	 */ 
+	private static FuzzyReflection getPacketRegistry() {
+		if (packetRegistry == null)
+			packetRegistry = FuzzyReflection.fromClass(Packet.class, true);
+		return packetRegistry;
+	}
+	
+	/**
+	 * Retrieve the injected proxy classes handlig each packet ID.
+	 * @return Injected classes.
+	 */
+	public static Map<Integer, Class> getOverwrittenPackets() {
+		return overwrittenPackets;
+	}
+	
+	/**
+	 * Retrieve the vanilla classes handling each packet ID.
+	 * @return Vanilla classes.
+	 */
+	public static Map<Integer, Class> getPreviousPackets() {
+		return previousValues;
+	}
+	
+	/**
+	 * Retrieve every known and supported server packet.
+	 * @return An immutable set of every known server packet.
+	 * @throws FieldAccessException If we're unable to retrieve the server packet data from Minecraft.
+	 */
+	public static Set<Integer> getServerPackets() throws FieldAccessException {
+		initializeSets();
+		return serverPackets;
+	}
+	
+	/**
+	 * Retrieve every known and supported client packet.
+	 * @return An immutable set of every known client packet.
+	 * @throws FieldAccessException If we're unable to retrieve the client packet data from Minecraft.
+	 */
+	public static Set<Integer> getClientPackets() throws FieldAccessException {
+		initializeSets();
+		return clientPackets;
+	}
+	
+	@SuppressWarnings("unchecked")
+	private static void initializeSets() throws FieldAccessException {
+		if (serverPackets == null || clientPackets == null) {
+			List<Field> sets = getPacketRegistry().getFieldListByType(Set.class);
+			
+			try {
+				if (sets.size() > 1) {
+					serverPackets = (Set<Integer>) FieldUtils.readStaticField(sets.get(0), true);
+					clientPackets = (Set<Integer>) FieldUtils.readStaticField(sets.get(1), true);
+					
+					// Impossible
+					if (serverPackets == null || clientPackets == null)
+						throw new FieldAccessException("Packet sets are in an illegal state.");
+					
+					// NEVER allow callers to modify the underlying sets
+					serverPackets = ImmutableSet.copyOf(serverPackets);
+					clientPackets = ImmutableSet.copyOf(clientPackets);
+					
+				} else {
+					throw new FieldAccessException("Cannot retrieve packet client/server sets.");
+				}
+				
+			} catch (IllegalAccessException e) {
+				throw new FieldAccessException("Cannot access field.", e);
+			}
+		}
+	}
+	
+	/**
+	 * Retrieves the correct packet class from a given packet ID.
+	 * @param packetID - the packet ID.
+	 * @return The associated class.
+	 */
+	public static Class getPacketClassFromID(int packetID) {
+		return getPacketClassFromID(packetID, false);
+	}
+	
+	/**
+	 * Retrieves the correct packet class from a given packet ID.
+	 * @param packetID - the packet ID.
+ 	 * @param vanilla - whether or not to look for vanilla classes, not injected classes.
+	 * @return The associated class.
+	 */
+	public static Class getPacketClassFromID(int packetID, boolean forceVanilla) {
+		
+		Map<Integer, Class> lookup = forceVanilla ? previousValues : overwrittenPackets;
+		
+		// Optimized lookup
+		if (lookup.containsKey(packetID)) {
+			return lookup.get(packetID);
+		}
+
+		// Will most likely not be used
+		for (Map.Entry<Class, Integer> entry : getPacketToID().entrySet()) {
+			if (Objects.equal(entry.getValue(), packetID)) {
+				return entry.getKey();
+			}
+		}
+		
+		throw new IllegalArgumentException("The packet ID " + packetID + " is not registered.");
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketConstructor.java

@@ -0,0 +1,204 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.List;
+
+import net.minecraft.server.Packet;
+
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+
+/**
+ * A packet constructor that uses an internal Minecraft.
+ * @author Kristian
+ *
+ */
+public class PacketConstructor {
+
+	/**
+	 * A packet constructor that automatically converts Bukkit types to their NMS conterpart. 
+	 * <p>
+	 * Remember to call withPacket().
+	 */
+	public static final PacketConstructor DEFAULT = new PacketConstructor(null);
+	
+	// The constructor method that's actually responsible for creating the packet
+	private Constructor<?> constructorMethod;
+	
+	// The packet ID
+	private int packetID;
+	
+	// Used to unwrap Bukkit objects
+	private List<Unwrapper> unwrappers;
+	
+	private PacketConstructor(Constructor<?> constructorMethod) {
+		this.constructorMethod = constructorMethod;
+		this.unwrappers = Lists.newArrayList((Unwrapper) new BukkitUnwrapper());
+	}
+	
+	private PacketConstructor(int packetID, Constructor<?> constructorMethod, List<Unwrapper> unwrappers) {
+		this.packetID = packetID;
+		this.constructorMethod = constructorMethod;
+		this.unwrappers = unwrappers;
+	}
+	
+	public ImmutableList<Unwrapper> getUnwrappers() {
+		return ImmutableList.copyOf(unwrappers);
+	}
+	
+	/**
+	 * Retrieve the id of the packets this constructor creates.
+	 * @return The ID of the packets this constructor will create.
+	 */
+	public int getPacketID() {
+		return packetID;
+	}
+	
+	/**
+	 * Return a copy of the current constructor with a different list of unwrappers.
+	 * @param unwrappers - list of unwrappers that convert Bukkit wrappers into the equivalent NMS classes.
+	 * @return A constructor with a different set of unwrappers.
+	 */
+	public PacketConstructor withUnwrappers(List<Unwrapper> unwrappers) {
+		return new PacketConstructor(packetID, constructorMethod, unwrappers);
+	}
+
+	/**
+	 * Create a packet constructor that creates packets using the given types.
+	 * @param id - packet ID.
+	 * @param values - types to create.
+	 * @return A packet constructor with these types.
+	 * @throws IllegalArgumentException If no packet constructor could be created with these types.
+	 */
+	public PacketConstructor withPacket(int id, Object[] values) {
+		
+		Class<?>[] types = new Class<?>[values.length];
+		
+		for (int i = 0; i < types.length; i++) {
+			// Default type
+			if (values[i] != null) {
+				types[i] = values[i].getClass();
+				
+				for (Unwrapper unwrapper : unwrappers) {
+					Object result = unwrapper.unwrapItem(values[i]);
+					
+					// Update type we're searching for
+					if (result != null) {
+						types[i] = result.getClass();
+						break;
+					}
+				}
+			
+			} else {
+				// Try it
+				types[i] = Object.class;
+			}
+		}
+		
+		Class<?> packetType = MinecraftRegistry.getPacketClassFromID(id);
+		
+		if (packetType == null)
+			throw new IllegalArgumentException("Could not find a packet by the id " + id);
+		
+		// Find the correct constructor
+		for (Constructor<?> constructor : packetType.getConstructors()) {
+			Class<?>[] params = constructor.getParameterTypes();
+
+			if (isCompatible(types, params)) {
+				// Right, we've found our type
+				return new PacketConstructor(id, constructor, unwrappers);
+			}
+		}
+		
+		throw new IllegalArgumentException("No suitable constructor could be found.");
+	}
+	
+	/**
+	 * Construct a packet using the special builtin Minecraft constructors.
+	 * @param values - values containing Bukkit wrapped items to pass to Minecraft.
+	 * @return The created packet.
+	 * @throws FieldAccessException Failure due to a security limitation.
+	 * @throws IllegalArgumentException Arguments doesn't match the constructor.
+	 * @throws RuntimeException Minecraft threw an exception.
+	 */
+	public PacketContainer createPacket(Object... values) throws FieldAccessException {
+		
+		try {
+			// Convert types
+			for (int i = 0; i < values.length; i++) {
+				for (Unwrapper unwrapper : unwrappers) {
+					Object converted = unwrapper.unwrapItem(values[i]);
+					
+					if (converted != null) {
+						values[i] = converted;
+						break;
+					}
+				}
+			}
+			
+			Packet nmsPacket = (Packet) constructorMethod.newInstance(values);
+			return new PacketContainer(packetID, nmsPacket);
+			
+		} catch (IllegalArgumentException e) {
+			throw e;
+		} catch (InstantiationException e) {
+			throw new FieldAccessException("Cannot construct an abstract packet.", e);
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot construct packet due to a security limitation.", e);
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Minecraft error.", e);
+		}
+	}
+	
+	// Determine if a method with the types 'params' can be called with 'types'
+	private static boolean isCompatible(Class<?>[] types, Class<?>[] params) {
+		
+		// Determine if the types are similar
+		if (params.length == types.length) {
+			for (int i = 0; i < params.length; i++) {
+				if (!params[i].isAssignableFrom(types[i])) {
+					return false;
+				}
+			}
+			
+			return true;
+		}
+		
+		// Parameter count must match
+		return false;
+	}
+
+	/**
+	 * Represents a unwrapper for a constructor parameter.
+	 * 
+	 * @author Kristian
+	 */
+	public static interface Unwrapper {
+		/**
+		 * Convert the given wrapped object to the equivalent net.minecraft.server object.
+		 * @param wrappedObject - wrapped object.
+		 * @return The net.minecraft.server object.
+		 */
+		public Object unwrapItem(Object wrappedObject);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketFilterManager.java

@@ -0,0 +1,787 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.annotation.Nullable;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.bukkit.event.server.PluginDisableEvent;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.PluginManager;
+
+import com.comphenix.protocol.AsynchronousManager;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.async.AsyncFilterManager;
+import com.comphenix.protocol.async.AsyncMarker;
+import com.comphenix.protocol.events.*;
+import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldAccessException;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.google.common.base.Objects;
+import com.google.common.base.Predicate;
+import com.google.common.collect.ImmutableSet;
+
+public final class PacketFilterManager implements ProtocolManager, ListenerInvoker {
+
+	/**
+	 * Sets the inject hook type. Different types allow for maximum compatibility.
+	 * @author Kristian
+	 */
+	public enum PlayerInjectHooks {
+		/**
+		 * The injection hook that does nothing. Set when every other inject hook fails.
+		 */
+		NONE,
+		
+		/**
+		 * Override the network handler object itself. Only works in 1.3.
+		 * <p>
+		 * Cannot intercept MapChunk packets. 
+		 */
+		NETWORK_MANAGER_OBJECT,
+		
+		/**
+		 * Override the packet queue lists in NetworkHandler. 
+		 * <p>
+		 * Cannot intercept MapChunk packets. 
+		 */
+		NETWORK_HANDLER_FIELDS,
+		
+		/**
+		 * Override the server handler object. Versatile, but a tad slower.
+		 */
+		NETWORK_SERVER_OBJECT;
+	}
+	
+	// The amount of time to wait until we actually unhook every player
+	private static final int TICKS_PER_SECOND = 20;
+	private static final int UNHOOK_DELAY = 5 * TICKS_PER_SECOND; 
+	
+	// Delayed unhook
+	private DelayedSingleTask unhookTask;
+	
+	// Create a concurrent set
+	private Set<PacketListener> packetListeners = 
+			Collections.newSetFromMap(new ConcurrentHashMap<PacketListener, Boolean>());
+		
+	// Packet injection
+	private PacketInjector packetInjector;
+	
+	// Different injection types per game phase
+	private PlayerInjectionHandler playerInjection;
+
+	// The two listener containers
+	private SortedPacketListenerList recievedListeners = new SortedPacketListenerList();
+	private SortedPacketListenerList sendingListeners = new SortedPacketListenerList();
+	
+	// Whether or not this class has been closed
+	private volatile boolean hasClosed;
+	
+	// The default class loader
+	private ClassLoader classLoader;
+		
+	// Error logger
+	private Logger logger;
+	
+	// The current server
+	private Server server;
+	
+	// The async packet handler
+	private AsyncFilterManager asyncFilterManager;
+	
+	// Valid server and client packets
+	private Set<Integer> serverPackets;
+	private Set<Integer> clientPackets;
+	
+	// Ensure that we're not performing too may injections
+	private AtomicInteger phaseLoginCount = new AtomicInteger(0);
+	private AtomicInteger phasePlayingCount = new AtomicInteger(0);
+	
+	/**
+	 * Only create instances of this class if protocol lib is disabled.
+	 * @param unhookTask 
+	 */
+	public PacketFilterManager(ClassLoader classLoader, Server server, DelayedSingleTask unhookTask, Logger logger) {
+		if (logger == null)
+			throw new IllegalArgumentException("logger cannot be NULL.");
+		if (classLoader == null)
+			throw new IllegalArgumentException("classLoader cannot be NULL.");
+		
+		// Just boilerplate
+		final DelayedSingleTask finalUnhookTask = unhookTask;
+		
+		// References
+		this.unhookTask = unhookTask;
+		this.server = server;
+		this.classLoader = classLoader;
+		this.logger = logger;
+		
+		// Used to determine if injection is needed
+		Predicate<GamePhase> isInjectionNecessary = new Predicate<GamePhase>() {
+			@Override
+			public boolean apply(@Nullable GamePhase phase) {
+				boolean result = true;
+				
+				if (phase.hasLogin())
+					result &= getPhaseLoginCount() > 0;
+				// Note that we will still hook players if the unhooking has been delayed
+				if (phase.hasPlaying())
+					result &= getPhasePlayingCount() > 0 || finalUnhookTask.isRunning();
+				return result;
+			}
+		};
+		
+		try {
+			// Initialize injection mangers
+			this.playerInjection = new PlayerInjectionHandler(classLoader, logger, isInjectionNecessary, this, server);
+			this.packetInjector = new PacketInjector(classLoader, this, playerInjection);
+			this.asyncFilterManager = new AsyncFilterManager(logger, server.getScheduler(), this);
+			
+			// Attempt to load the list of server and client packets
+			try {
+				this.serverPackets = MinecraftRegistry.getServerPackets();
+				this.clientPackets = MinecraftRegistry.getClientPackets();
+			} catch (FieldAccessException e) {
+				logger.log(Level.WARNING, "Cannot load server and client packet list.", e);
+			}
+
+		} catch (IllegalAccessException e) {
+			logger.log(Level.SEVERE, "Unable to initialize packet injector.", e);
+		}
+	}
+	
+	@Override
+	public AsynchronousManager getAsynchronousManager() {
+		return asyncFilterManager;
+	}
+	
+	/**
+	 * Retrieves how the server packets are read.
+	 * @return Injection method for reading server packets.
+	 */
+	public PlayerInjectHooks getPlayerHook() {
+		return playerInjection.getPlayerHook();
+	}
+
+	/**
+	 * Sets how the server packets are read.
+	 * @param playerHook - the new injection method for reading server packets.
+	 */
+	public void setPlayerHook(PlayerInjectHooks playerHook) {
+		playerInjection.setPlayerHook(playerHook);
+		
+		// Make sure the current listeners are compatible
+		playerInjection.checkListener(packetListeners);
+	}
+
+	public Logger getLogger() {
+		return logger;
+	}
+	
+	@Override
+	public ImmutableSet<PacketListener> getPacketListeners() {
+		return ImmutableSet.copyOf(packetListeners);
+	}
+
+	@Override
+	public void addPacketListener(PacketListener listener) {
+		if (listener == null)
+			throw new IllegalArgumentException("listener cannot be NULL.");
+		
+		// A listener can only be added once
+		if (packetListeners.contains(listener))
+			return;
+		
+		ListeningWhitelist sending = listener.getSendingWhitelist();
+		ListeningWhitelist receiving = listener.getReceivingWhitelist();
+		boolean hasSending = sending != null && sending.isEnabled();
+		boolean hasReceiving = receiving != null && receiving.isEnabled();
+		
+		if (hasSending || hasReceiving) {
+			// Add listeners and hooks
+			if (hasSending) {
+				verifyWhitelist(listener, sending);
+				sendingListeners.addListener(listener, sending);
+				enablePacketFilters(listener, ConnectionSide.SERVER_SIDE, sending.getWhitelist());
+				
+				// Make sure this is possible
+				playerInjection.checkListener(listener);
+			}
+			if (hasReceiving) {
+				verifyWhitelist(listener, receiving);
+				recievedListeners.addListener(listener, receiving);
+				enablePacketFilters(listener, ConnectionSide.CLIENT_SIDE, receiving.getWhitelist());
+			}
+			
+			// Increment phases too
+			if (hasSending)
+				incrementPhases(sending.getGamePhase());
+			if (hasReceiving)
+				incrementPhases(receiving.getGamePhase());
+			
+			// Inform our injected hooks
+			packetListeners.add(listener);
+		}
+	}
+	
+	/**
+	 * Invoked to handle the different game phases of a added listener.
+	 * @param phase - listener's game game phase.
+	 */
+	private void incrementPhases(GamePhase phase) {
+		if (phase.hasLogin())
+			phaseLoginCount.incrementAndGet();
+		
+		// We may have to inject into every current player
+		if (phase.hasPlaying()) {
+			if (phasePlayingCount.incrementAndGet() == 1) {
+				// If we're about to uninitialize every player, cancel that instead
+				if (unhookTask.isRunning())
+					unhookTask.cancel();
+				else
+					// Inject our hook into already existing players
+					initializePlayers(server.getOnlinePlayers());
+			}
+		}
+	}
+	
+	/**
+	 * Invoked to handle the different game phases of a removed listener.
+	 * @param phase - listener's game game phase.
+	 */
+	private void decrementPhases(GamePhase phase) {
+		if (phase.hasLogin())
+			phaseLoginCount.decrementAndGet();
+		
+		// We may have to inject into every current player
+		if (phase.hasPlaying()) {
+			if (phasePlayingCount.decrementAndGet() == 0) {
+				// Schedule unhooking in the future
+				unhookTask.schedule(UNHOOK_DELAY, new Runnable() {
+					@Override
+					public void run() {
+						// Inject our hook into already existing players
+						uninitializePlayers(server.getOnlinePlayers());
+					}
+				});
+			}
+		}
+	}
+	
+	/**
+	 * Determine if the packet IDs in a whitelist is valid.
+	 * @param listener - the listener that will be mentioned in the error.
+	 * @param whitelist - whitelist of packet IDs.
+	 * @throws IllegalArgumentException If the whitelist is illegal.
+	 */
+	public static void verifyWhitelist(PacketListener listener, ListeningWhitelist whitelist) {
+		for (Integer id : whitelist.getWhitelist()) {
+			if (id >= 256 || id < 0) {
+				throw new IllegalArgumentException(String.format("Invalid packet id %s in listener %s.", 
+							id, PacketAdapter.getPluginName(listener))
+				);
+			}
+		}
+	}
+		
+	@Override
+	public void removePacketListener(PacketListener listener) {
+		if (listener == null)
+			throw new IllegalArgumentException("listener cannot be NULL");
+
+		List<Integer> sendingRemoved = null;
+		List<Integer> receivingRemoved = null;
+		
+		ListeningWhitelist sending = listener.getSendingWhitelist();
+		ListeningWhitelist receiving = listener.getReceivingWhitelist();
+		
+		// Remove from the overal list of listeners
+		if (!packetListeners.remove(listener))
+			return;
+		
+		// Remove listeners and phases
+		if (sending != null && sending.isEnabled()) {
+			sendingRemoved = sendingListeners.removeListener(listener, sending);
+			decrementPhases(sending.getGamePhase());
+		}
+		if (receiving != null && receiving.isEnabled()) {
+			receivingRemoved = recievedListeners.removeListener(listener, receiving);
+			decrementPhases(receiving.getGamePhase());
+		}
+		
+		// Remove hooks, if needed
+		if (sendingRemoved != null && sendingRemoved.size() > 0)
+			disablePacketFilters(ConnectionSide.SERVER_SIDE, sendingRemoved);
+		if (receivingRemoved != null && receivingRemoved.size() > 0)
+			disablePacketFilters(ConnectionSide.CLIENT_SIDE, receivingRemoved);
+	}
+	
+	@Override
+	public void removePacketListeners(Plugin plugin) {
+		
+		// Iterate through every packet listener
+		for (PacketListener listener : packetListeners) {			
+			// Remove the listener
+			if (Objects.equal(listener.getPlugin(), plugin)) {
+				removePacketListener(listener);
+			}
+		}
+		
+		// Do the same for the asynchronous events
+		asyncFilterManager.unregisterAsyncHandlers(plugin);
+	}
+	
+	@Override
+	public void invokePacketRecieving(PacketEvent event) {
+		handlePacket(recievedListeners, event, false);
+	}
+
+	@Override
+	public void invokePacketSending(PacketEvent event) {
+		handlePacket(sendingListeners, event, true);
+	}
+	
+	/**
+	 * Handle a packet sending or receiving event.
+	 * <p>
+	 * Note that we also handle asynchronous events.
+	 * @param packetListeners - packet listeners that will receive this event.
+	 * @param event - the evnet to broadcast.
+	 */
+	private void handlePacket(SortedPacketListenerList packetListeners, PacketEvent event, boolean sending) {
+		
+		// By default, asynchronous packets are queued for processing
+		if (asyncFilterManager.hasAsynchronousListeners(event)) {
+			event.setAsyncMarker(asyncFilterManager.createAsyncMarker());
+		}
+		
+		// Process synchronous events
+		if (sending)
+			packetListeners.invokePacketSending(logger, event);
+		else
+			packetListeners.invokePacketRecieving(logger, event);
+		
+		// To cancel asynchronous processing, use the async marker
+		if (!event.isCancelled() && !hasAsyncCancelled(event.getAsyncMarker())) {
+			asyncFilterManager.enqueueSyncPacket(event, event.getAsyncMarker());
+
+			// The above makes a copy of the event, so it's safe to cancel it
+			event.setCancelled(true);
+		}
+	}
+	
+	// NULL marker mean we're dealing with no asynchronous listeners 
+	private boolean hasAsyncCancelled(AsyncMarker marker) {
+		return marker == null || marker.isAsyncCancelled();
+	}
+	
+	/**
+	 * Enables packet events for a given packet ID.
+	 * <p>
+	 * Note that all packets are disabled by default.
+	 * 
+	 * @param listener - the listener that requested to enable these filters.
+	 * @param side - which side the event will arrive from.
+	 * @param packets - the packet id(s).
+	 */
+	private void enablePacketFilters(PacketListener listener, ConnectionSide side, Iterable<Integer> packets) {
+		if (side == null)
+			throw new IllegalArgumentException("side cannot be NULL.");
+
+		// Note the difference between unsupported and valid.
+		// Every packet ID between and including 0 - 255 is valid, but only a subset is supported.
+		
+		for (int packetID : packets) {
+			// Only register server packets that are actually supported by Minecraft
+			if (side.isForServer()) {
+				if (serverPackets != null && serverPackets.contains(packetID))
+					playerInjection.addPacketHandler(packetID);
+				else
+					logger.warning(String.format(
+							"[%s] Unsupported server packet ID in current Minecraft version: %s",
+							PacketAdapter.getPluginName(listener), packetID
+					));
+			}
+			
+			// As above, only for client packets
+			if (side.isForClient() && packetInjector != null) {
+				if (clientPackets != null && clientPackets.contains(packetID))
+					packetInjector.addPacketHandler(packetID);
+				else
+					logger.warning(String.format(
+							"[%s] Unsupported client packet ID in current Minecraft version: %s",
+							PacketAdapter.getPluginName(listener), packetID
+					));
+			}
+		}
+	}
+
+	/**
+	 * Disables packet events from a given packet ID.
+	 * @param packets - the packet id(s).
+	 * @param side - which side the event no longer should arrive from.
+	 */
+	private void disablePacketFilters(ConnectionSide side, Iterable<Integer> packets) {
+		if (side == null)
+			throw new IllegalArgumentException("side cannot be NULL.");
+		
+		for (int packetID : packets) {
+			if (side.isForServer())
+				playerInjection.removePacketHandler(packetID);
+			if (side.isForClient() && packetInjector != null) 
+				packetInjector.removePacketHandler(packetID);
+		}
+	}
+	
+	@Override
+	public void sendServerPacket(Player reciever, PacketContainer packet) throws InvocationTargetException {
+		sendServerPacket(reciever, packet, true);
+	}
+	
+	@Override
+	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters) throws InvocationTargetException {
+		if (reciever == null)
+			throw new IllegalArgumentException("reciever cannot be NULL.");
+		if (packet == null)
+			throw new IllegalArgumentException("packet cannot be NULL.");
+		
+		playerInjection.sendServerPacket(reciever, packet, filters);
+	}
+
+	@Override
+	public void recieveClientPacket(Player sender, PacketContainer packet) throws IllegalAccessException, InvocationTargetException {
+		recieveClientPacket(sender, packet, true);
+	}
+	
+	@Override
+	public void recieveClientPacket(Player sender, PacketContainer packet, boolean filters) throws IllegalAccessException, InvocationTargetException {
+		
+		if (sender == null)
+			throw new IllegalArgumentException("sender cannot be NULL.");
+		if (packet == null)
+			throw new IllegalArgumentException("packet cannot be NULL.");
+		
+		Packet mcPacket = packet.getHandle();
+		
+		// Make sure the packet isn't cancelled
+		packetInjector.undoCancel(packet.getID(), mcPacket);
+		
+		if (filters) {
+			PacketEvent event  = packetInjector.packetRecieved(packet, sender);
+			
+			if (!event.isCancelled())
+				mcPacket = event.getPacket().getHandle();
+			else
+				return;
+		}
+		
+		playerInjection.processPacket(sender, mcPacket);
+	}
+	
+	@Override
+	public PacketContainer createPacket(int id) {
+		return createPacket(id, true);
+	}
+	
+	@Override
+	public PacketContainer createPacket(int id, boolean forceDefaults) {
+		PacketContainer packet = new PacketContainer(id);
+		
+		// Use any default values if possible
+		if (forceDefaults) {
+			try {
+				packet.getModifier().writeDefaults();
+			} catch (FieldAccessException e) {
+				throw new RuntimeException("Security exception.", e);
+			}
+		}
+		
+		return packet;
+	}
+	
+	@Override
+	public PacketConstructor createPacketConstructor(int id, Object... arguments) {
+		return PacketConstructor.DEFAULT.withPacket(id, arguments);
+	}
+
+	@Override
+	public Set<Integer> getSendingFilters() {
+		return playerInjection.getSendingFilters();
+	}
+	
+	@Override
+	public Set<Integer> getReceivingFilters() {
+		return ImmutableSet.copyOf(packetInjector.getPacketHandlers());
+	}
+	
+	@Override
+	public void updateEntity(Entity entity, List<Player> observers) throws FieldAccessException {
+		EntityUtilities.updateEntity(entity, observers);
+	}
+	
+	/**
+	 * Initialize the packet injection for every player.
+	 * @param players - list of players to inject. 
+	 */
+	public void initializePlayers(Player[] players) {
+		for (Player player : players)
+			playerInjection.injectPlayer(player);
+	}
+	
+	/**
+	 * Uninitialize the packet injection of every player.
+	 * @param players - list of players to uninject. 
+	 */
+	public void uninitializePlayers(Player[] players) {
+		for (Player player : players)
+			playerInjection.uninjectPlayer(player);
+	}
+	
+	/**
+	 * Register this protocol manager on Bukkit.
+	 * @param manager - Bukkit plugin manager that provides player join/leave events.
+	 * @param plugin - the parent plugin.
+	 */
+	public void registerEvents(PluginManager manager, final Plugin plugin) {
+		
+		try {
+			manager.registerEvents(new Listener() {
+				@EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+			    public void onPrePlayerJoin(PlayerJoinEvent event) {
+					// Let's clean up the other injection first.
+					playerInjection.uninjectPlayer(event.getPlayer().getAddress());
+			    }
+				
+				@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+			    public void onPlayerJoin(PlayerJoinEvent event) {
+					// This call will be ignored if no listeners are registered
+					playerInjection.injectPlayer(event.getPlayer());
+			    }
+				
+				@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+			    public void onPlayerQuit(PlayerQuitEvent event) {
+					playerInjection.uninjectPlayer(event.getPlayer());
+			    }
+				
+				@EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+			    public void onPluginDisabled(PluginDisableEvent event) {
+					// Clean up in case the plugin forgets
+					if (event.getPlugin() != plugin) {
+						removePacketListeners(event.getPlugin());
+					}
+			    }
+				
+			}, plugin);
+		
+		} catch (NoSuchMethodError e) {
+			// Oh wow! We're running on 1.0.0 or older.
+			registerOld(manager, plugin);
+		}
+	}
+	
+	/**
+	 * Retrieve the number of listeners that expect packets during playing.
+	 * @return Number of listeners.
+	 */
+	private int getPhasePlayingCount() {
+		return phasePlayingCount.get();
+	}
+	
+	/**
+	 * Retrieve the number of listeners that expect packets during login.
+	 * @return Number of listeners
+	 */
+	private int getPhaseLoginCount() {
+		return phaseLoginCount.get();
+	}
+	
+	@Override
+	public int getPacketID(Packet packet) {
+		if (packet == null)
+			throw new IllegalArgumentException("Packet cannot be NULL.");
+		
+		return MinecraftRegistry.getPacketToID().get(packet.getClass());
+	}
+	
+	// Yes, this is crazy.
+	@SuppressWarnings({ "unchecked", "rawtypes" })
+	private void registerOld(PluginManager manager, Plugin plugin) {
+		
+		try {
+			ClassLoader loader = manager.getClass().getClassLoader();
+			
+			// The different enums we are going to need
+			Class eventTypes = loader.loadClass("org.bukkit.event.Event$Type");
+			Class eventPriority = loader.loadClass("org.bukkit.event.Event$Priority");
+			
+			// Get the priority
+			Object priorityMonitor = Enum.valueOf(eventPriority, "Monitor");
+			
+			// Get event types
+			Object playerJoinType = Enum.valueOf(eventTypes, "PLAYER_JOIN");
+			Object playerQuitType = Enum.valueOf(eventTypes, "PLAYER_QUIT");
+			Object pluginDisabledType = Enum.valueOf(eventTypes, "PLUGIN_DISABLE");
+			
+			// The player listener! Good times.
+			Class<?> playerListener = loader.loadClass("org.bukkit.event.player.PlayerListener");
+			Class<?> serverListener = loader.loadClass("org.bukkit.event.server.ServerListener");
+			
+			// Find the register event method
+			Method registerEvent = FuzzyReflection.fromObject(manager).getMethodByParameters("registerEvent", 
+					eventTypes, Listener.class, eventPriority, Plugin.class);
+
+			Enhancer playerEx = new Enhancer();
+			Enhancer serverEx = new Enhancer();
+			
+			playerEx.setSuperclass(playerListener);
+			playerEx.setClassLoader(classLoader);
+			playerEx.setCallback(new MethodInterceptor() {
+				@Override
+				public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+					// Must have a parameter
+					if (args.length == 1) {
+						Object event = args[0];
+						
+						// Check for the correct event
+						if (event instanceof PlayerJoinEvent)
+							playerInjection.injectPlayer(((PlayerJoinEvent) event).getPlayer());
+						else if (event instanceof PlayerQuitEvent)
+							playerInjection.uninjectPlayer(((PlayerQuitEvent) event).getPlayer());
+					}
+					return null;
+				}
+			});
+			
+			serverEx.setSuperclass(serverListener);
+			serverEx.setClassLoader(classLoader);
+			serverEx.setCallback(new MethodInterceptor() {
+				@Override
+				public Object intercept(Object obj, Method method, Object[] args,
+						MethodProxy proxy) throws Throwable {
+					// Must have a parameter
+					if (args.length == 1) {
+						Object event = args[0];
+						
+						if (event instanceof PluginDisableEvent)
+							removePacketListeners(((PluginDisableEvent) event).getPlugin());
+					}
+					return null;
+				}
+			});
+			
+			// Create our listener
+			Object playerProxy = playerEx.create();
+			Object serverProxy = serverEx.create();
+			
+			registerEvent.invoke(manager, playerJoinType, playerProxy, priorityMonitor, plugin);
+			registerEvent.invoke(manager, playerQuitType, playerProxy, priorityMonitor, plugin);
+			registerEvent.invoke(manager, pluginDisabledType, serverProxy, priorityMonitor, plugin);
+			
+			// A lot can go wrong
+		} catch (ClassNotFoundException e1) {
+			e1.printStackTrace();
+		} catch (IllegalArgumentException e) {
+			e.printStackTrace();
+		} catch (IllegalAccessException e) {
+			e.printStackTrace();
+		} catch (InvocationTargetException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	/**
+	 * Retrieve every known and supported server packet.
+	 * @return An immutable set of every known server packet.
+	 * @throws FieldAccessException If we're unable to retrieve the server packet data from Minecraft.
+	 */
+	public static Set<Integer> getServerPackets() throws FieldAccessException {
+		return MinecraftRegistry.getServerPackets();
+	}
+	
+	/**
+	 * Retrieve every known and supported client packet.
+	 * @return An immutable set of every known client packet.
+	 * @throws FieldAccessException If we're unable to retrieve the client packet data from Minecraft.
+	 */
+	public static Set<Integer> getClientPackets() throws FieldAccessException {
+		return MinecraftRegistry.getClientPackets();
+	}
+	
+	/**
+	 * Retrieves the current plugin class loader.
+	 * @return Class loader.
+	 */
+	public ClassLoader getClassLoader() {
+		return classLoader;
+	}
+	
+	@Override
+	public boolean isClosed() {
+		return hasClosed;
+	}
+	
+	/**
+	 * Called when ProtocolLib is closing.
+	 */
+	public void close() {
+		// Guard
+		if (hasClosed)
+			return;
+
+		// Remove packet handlers
+		if (packetInjector != null)
+			packetInjector.cleanupAll();
+		
+		// Remove server handler
+		playerInjection.close();
+		hasClosed = true;
+		
+		// Remove listeners
+		packetListeners.clear();
+		
+		// Clean up async handlers. We have to do this last.
+		asyncFilterManager.cleanupAll();
+	}
+	
+	@Override
+	protected void finalize() throws Throwable {
+		close();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PacketInjector.java

@@ -1,177 +1,245 @@
-package com.comphenix.protocol.injector;
-
-import java.io.DataInputStream;
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.util.Map;
-import java.util.Set;
-
-import org.bukkit.entity.Player;
-
-import net.minecraft.server.Packet;
-import net.sf.cglib.proxy.Callback;
-import net.sf.cglib.proxy.Enhancer;
-
-import com.comphenix.protocol.events.PacketContainer;
-import com.comphenix.protocol.events.PacketEvent;
-import com.comphenix.protocol.reflect.FuzzyReflection;
-
-/**
- * This class is responsible for adding or removing proxy objects that intercepts recieved packets.
- * 
- * @author Kristian
- */
-class PacketInjector {
-
-	// The "put" method that associates a packet ID with a packet class
-	private static Method putMethod;
-	private static Object intHashMap;
-	
-	// The packet filter manager
-	private PacketFilterManager manager;
-	
-	// Allows us to determine the sender
-	private Map<DataInputStream, Player> playerLookup;
-	
-	// Class loader
-	private ClassLoader classLoader;
-			
-	public PacketInjector(ClassLoader classLoader, PacketFilterManager manager, 
-						  Map<DataInputStream, Player> playerLookup) throws IllegalAccessException {
-		
-		this.classLoader = classLoader;
-		this.manager = manager;
-		this.playerLookup = playerLookup;
-		initialize();
-	}
-	
-	private void initialize() throws IllegalAccessException {
-		if (intHashMap == null) {
-			// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
-			Field intHashMapField = FuzzyReflection.fromClass(Packet.class).getFieldByType(FuzzyReflection.MINECRAFT_OBJECT);
-			
-			try {
-				intHashMap = intHashMapField.get(null);
-			} catch (IllegalArgumentException e) {
-				throw new RuntimeException("Minecraft is incompatible.", e);
-			}
-			
-			// Now, get the "put" method.
-			putMethod = FuzzyReflection.fromObject(intHashMap).getMethodByParameters("put", int.class, Object.class);
-		}
-	}
-	
-	@SuppressWarnings("rawtypes")
-	public boolean addPacketHandler(int packetID) {
-		if (hasPacketHandler(packetID))
-			return false;
-		
-		Enhancer ex = new Enhancer();
-		
-		// Unfortunately, we can't easily distinguish between these two functions:
-		//   * Object lookup(int par1)
-		//   * Object removeObject(int par1)
-		
-		// So, we'll use the classMapToInt registry instead.
-		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
-		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
-		Map<Class, Integer> registry = MinecraftRegistry.getPacketToID();
-		Class old = MinecraftRegistry.getPacketClassFromID(packetID);
-		
-		// Check for previous injections
-		if (!old.getName().startsWith("net.minecraft.")) {
-			throw new IllegalStateException("Packet " + packetID + " has already been injected.");
-		}
-		
-		// Subclass the specific packet class
-		ex.setSuperclass(old);
-		ex.setCallbackType(ReadPacketModifier.class);
-		ex.setUseCache(false);
-		ex.setClassLoader(classLoader);
-		Class proxy = ex.createClass();
-		
-		// Add a static reference
-		Enhancer.registerStaticCallbacks(proxy, new Callback[] { 
-				new ReadPacketModifier(packetID, this) 
-		});
-		
-		try {
-			// Override values
-			putMethod.invoke(intHashMap, packetID, proxy);
-			previous.put(packetID, old);
-			registry.put(proxy, packetID);
-			overwritten.put(packetID, proxy);
-			return true;
-			
-		} catch (IllegalArgumentException e) {
-			throw new RuntimeException("Illegal argument.", e);
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
-	}
-	
-	@SuppressWarnings("rawtypes")
-	public boolean removePacketHandler(int packetID) {
-		if (!hasPacketHandler(packetID))
-			return false;
-		
-		Map<Class, Integer> registry = MinecraftRegistry.getPacketToID();
-		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
-		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
-		
-		// Use the old class definition
-		try {
-			Class old = previous.get(packetID);
-			Class proxy = MinecraftRegistry.getPacketClassFromID(packetID);
-			
-			putMethod.invoke(intHashMap, packetID, old);
-			previous.remove(packetID);
-			registry.remove(proxy);
-			overwritten.remove(packetID);
-			return true;
-			
-			// Handle some problems
-		} catch (IllegalArgumentException e) {
-			return false;
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Cannot access method.", e);
-		} catch (InvocationTargetException e) {
-			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
-		}
-	}
-	
-	public boolean hasPacketHandler(int packetID) {
-		return MinecraftRegistry.getPreviousPackets().containsKey(packetID);
-	}
-	
-	public Set<Integer> getPacketHandlers() {
-		return MinecraftRegistry.getPreviousPackets().keySet();
-	}
-	
-	// Called from the ReadPacketModified monitor
-	PacketEvent packetRecieved(PacketContainer packet, DataInputStream input) {
-		
-		Player client = playerLookup.get(input);
-		PacketEvent event = PacketEvent.fromClient((Object) manager, packet, client);
-		
-		manager.invokePacketRecieving(event);
-		return event;
-	}
-	
-	@SuppressWarnings("rawtypes")
-	public void cleanupAll() {
-		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
-		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
-		
-		// Remove every packet handler
-		for (Integer id : previous.keySet()) {
-			removePacketHandler(id);
-		}
-		
-		overwritten.clear();
-		previous.clear();
-	}
-}
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.io.DataInputStream;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.bukkit.entity.Player;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Callback;
+import net.sf.cglib.proxy.Enhancer;
+
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.injector.player.PlayerInjectionHandler;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+
+/**
+ * This class is responsible for adding or removing proxy objects that intercepts recieved packets.
+ * 
+ * @author Kristian
+ */
+class PacketInjector {
+
+	// The "put" method that associates a packet ID with a packet class
+	private static Method putMethod;
+	private static Object intHashMap;
+	
+	// The packet filter manager
+	private ListenerInvoker manager;
+	
+	// Allows us to determine the sender
+	private PlayerInjectionHandler playerInjection;
+	
+	// Allows us to look up read packet injectors
+	private Map<Integer, ReadPacketModifier> readModifier;
+	
+	// Class loader
+	private ClassLoader classLoader;
+			
+	public PacketInjector(ClassLoader classLoader, ListenerInvoker manager, 
+						  PlayerInjectionHandler playerInjection) throws IllegalAccessException {
+		
+		this.classLoader = classLoader;
+		this.manager = manager;
+		this.playerInjection = playerInjection;
+		this.readModifier = new ConcurrentHashMap<Integer, ReadPacketModifier>();
+		initialize();
+	}
+	
+	/**
+	 * Undo a packet cancel.
+	 * @param id - the id of the packet.
+	 * @param packet - packet to uncancel.
+	 */
+	public void undoCancel(Integer id, Packet packet) {
+		ReadPacketModifier modifier = readModifier.get(id);
+		
+		// Cancelled packets are represented with NULL
+		if (modifier != null && modifier.getOverride(packet) == null) {
+			modifier.removeOverride(packet);
+		}
+	}
+	
+	private void initialize() throws IllegalAccessException {
+		if (intHashMap == null) {
+			// We're looking for the first static field with a Minecraft-object. This should be a IntHashMap.
+			Field intHashMapField = FuzzyReflection.fromClass(Packet.class, true).getFieldByType(FuzzyReflection.MINECRAFT_OBJECT);
+			
+			try {
+				intHashMap = FieldUtils.readField(intHashMapField, (Object) null, true);
+			} catch (IllegalArgumentException e) {
+				throw new RuntimeException("Minecraft is incompatible.", e);
+			}
+			
+			// Now, get the "put" method.
+			putMethod = FuzzyReflection.fromObject(intHashMap).getMethodByParameters("put", int.class, Object.class);
+		}
+	}
+	
+	@SuppressWarnings("rawtypes")
+	public boolean addPacketHandler(int packetID) {
+		if (hasPacketHandler(packetID))
+			return false;
+		
+		Enhancer ex = new Enhancer();
+		
+		// Unfortunately, we can't easily distinguish between these two functions:
+		//   * Object lookup(int par1)
+		//   * Object removeObject(int par1)
+		
+		// So, we'll use the classMapToInt registry instead.
+		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
+		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
+		Map<Class, Integer> registry = MinecraftRegistry.getPacketToID();
+		Class old = MinecraftRegistry.getPacketClassFromID(packetID);
+		
+		// If this packet is not known
+		if (old == null) {
+			throw new IllegalStateException("Packet ID " + packetID + " is not a valid packet ID in this version.");
+		}
+		// Check for previous injections
+		if (!old.getName().startsWith("net.minecraft.")) {
+			throw new IllegalStateException("Packet " + packetID + " has already been injected.");
+		}
+		
+		// Subclass the specific packet class
+		ex.setSuperclass(old);
+		ex.setCallbackType(ReadPacketModifier.class);
+		ex.setUseCache(false);
+		ex.setClassLoader(classLoader);
+		Class proxy = ex.createClass();
+		
+		// Create the proxy handler
+		ReadPacketModifier modifier = new ReadPacketModifier(packetID, this);
+		readModifier.put(packetID, modifier);
+		
+		// Add a static reference
+		Enhancer.registerStaticCallbacks(proxy, new Callback[] { modifier });
+		
+		try {
+			// Override values
+			putMethod.invoke(intHashMap, packetID, proxy);
+			previous.put(packetID, old);
+			registry.put(proxy, packetID);
+			overwritten.put(packetID, proxy);
+			return true;
+			
+		} catch (IllegalArgumentException e) {
+			throw new RuntimeException("Illegal argument.", e);
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Cannot access method.", e);
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
+		}
+	}
+	
+	@SuppressWarnings("rawtypes")
+	public boolean removePacketHandler(int packetID) {
+		if (!hasPacketHandler(packetID))
+			return false;
+		
+		Map<Class, Integer> registry = MinecraftRegistry.getPacketToID();
+		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
+		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
+		
+		// Use the old class definition
+		try {
+			Class old = previous.get(packetID);
+			Class proxy = MinecraftRegistry.getPacketClassFromID(packetID);
+			
+			putMethod.invoke(intHashMap, packetID, old);
+			previous.remove(packetID);
+			readModifier.remove(packetID);
+			registry.remove(proxy);
+			overwritten.remove(packetID);
+			return true;
+			
+			// Handle some problems
+		} catch (IllegalArgumentException e) {
+			return false;
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Cannot access method.", e);
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Exception occured in IntHashMap.put.", e);
+		}
+	}
+	
+	public boolean hasPacketHandler(int packetID) {
+		return MinecraftRegistry.getPreviousPackets().containsKey(packetID);
+	}
+	
+	public Set<Integer> getPacketHandlers() {
+		return MinecraftRegistry.getPreviousPackets().keySet();
+	}
+	
+	// Called from the ReadPacketModified monitor
+	PacketEvent packetRecieved(PacketContainer packet, DataInputStream input) {
+		Player client = playerInjection.getPlayerByConnection(input);
+		
+		// Never invoke a event if we don't know where it's from
+		if (client != null)
+			return packetRecieved(packet, client);
+		else
+			return null;
+	}
+	
+	/**
+	 * Let the packet listeners process the given packet.
+	 * @param packet - a packet to process.
+	 * @param client - the client that sent the packet.
+	 * @return The resulting packet event.
+	 */
+	public PacketEvent packetRecieved(PacketContainer packet, Player client) {
+	
+		PacketEvent event = PacketEvent.fromClient((Object) manager, packet, client);
+		
+		manager.invokePacketRecieving(event);
+		return event;
+	}
+	
+	@SuppressWarnings("rawtypes")
+	public synchronized void cleanupAll() {
+		Map<Integer, Class> overwritten = MinecraftRegistry.getOverwrittenPackets();
+		Map<Integer, Class> previous = MinecraftRegistry.getPreviousPackets();
+		
+		// Remove every packet handler
+		for (Integer id : previous.keySet().toArray(new Integer[0])) {
+			removePacketHandler(id);
+		}
+		
+		overwritten.clear();
+		previous.clear();
+	}
+
+	/**
+	 * Inform the current PlayerInjector that it should update the DataInputStream next.
+	 * @param player - the player to update.
+	 */
+	public void scheduleDataInputRefresh(Player player) {
+		playerInjection.scheduleDataInputRefresh(player);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PlayerLoggedOutException.java

@@ -0,0 +1,58 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+/**
+ * Invoked when attempting to use a player that has already logged out.
+ * 
+ * @author Kristian
+ */
+public class PlayerLoggedOutException extends RuntimeException {
+
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = 4889257862160145234L;
+
+	public PlayerLoggedOutException() {
+		// Default error message
+		super("Cannot inject a player that has already logged out.");
+	}
+	
+	public PlayerLoggedOutException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+	public PlayerLoggedOutException(String message) {
+		super(message);
+	}
+
+	public PlayerLoggedOutException(Throwable cause) {
+		super(cause);
+	}
+	
+	/**
+	 * Construct an exception from a formatted message.
+	 * @param message - the message to format.
+	 * @param params - parameters.
+	 * @return The formated exception
+	 */
+	public static PlayerLoggedOutException fromFormat(String message, Object... params) {
+		return new PlayerLoggedOutException(String.format(message, params));
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/PrioritizedListener.java

@@ -0,0 +1,81 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import com.comphenix.protocol.events.ListenerPriority;
+import com.google.common.base.Objects;
+import com.google.common.primitives.Ints;
+
+/**
+ * Represents a listener with a priority.
+ * 
+ * @author Kristian
+ */
+public class PrioritizedListener<TListener> implements Comparable<PrioritizedListener<TListener>> {
+
+	private TListener listener;
+	private ListenerPriority priority;
+	
+	public PrioritizedListener(TListener listener, ListenerPriority priority) {
+		this.listener = listener;
+		this.priority = priority;
+	}
+
+	@Override
+	public int compareTo(PrioritizedListener<TListener> other) {
+		// This ensures that lower priority listeners are executed first
+		return Ints.compare(
+			this.getPriority().getSlot(),
+			other.getPriority().getSlot());
+	}
+	
+	// Note that this equals() method is NOT consistent with compareTo(). 
+	// But, it's a private class so who cares.
+	@SuppressWarnings("unchecked")
+	@Override
+	public boolean equals(Object obj) {
+		// We only care about the listener - priority itself should not make a difference
+	    if(obj instanceof PrioritizedListener){
+	        final PrioritizedListener<TListener> other = (PrioritizedListener<TListener>) obj;
+	        return Objects.equal(listener, other.listener);
+	    } else {
+	        return false;
+	    }
+	}
+	
+	@Override
+	public int hashCode() {
+		return Objects.hashCode(listener);
+	}
+	
+	/**
+	 * Retrieve the underlying listener.
+	 * @return Underlying listener.
+	 */
+	public TListener getListener() {
+		return listener;
+	}
+
+	/**
+	 * Retrieve the priority of this listener.
+	 * @return Listener priority.
+	 */
+	public ListenerPriority getPriority() {
+		return priority;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/ReadPacketModifier.java

@@ -1,84 +1,129 @@
-package com.comphenix.protocol.injector;
-
-import java.io.DataInputStream;
-import java.lang.reflect.Method;
-import java.util.WeakHashMap;
-
-import org.apache.commons.lang.ArrayUtils;
-
-import com.comphenix.protocol.events.PacketContainer;
-import com.comphenix.protocol.events.PacketEvent;
-
-import net.minecraft.server.Packet;
-import net.sf.cglib.proxy.MethodInterceptor;
-import net.sf.cglib.proxy.MethodProxy;
-
-class ReadPacketModifier implements MethodInterceptor {
-
-	@SuppressWarnings("rawtypes")
-	private static Class[] parameters = { DataInputStream.class };
-
-	// Common for all packets of the same type
-	private PacketInjector packetInjector;
-	private int packetID;
-	
-	// Whether or not a packet has been cancelled
-	private static WeakHashMap<Object, Object> override = new WeakHashMap<Object, Object>();
-	
-	public ReadPacketModifier(int packetID, PacketInjector packetInjector) {
-		this.packetID = packetID;
-		this.packetInjector = packetInjector;
-	}
-
-	@Override
-	public Object intercept(Object thisObj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
-		
-		Object returnValue = null;
-		String methodName = method.getName();
-
-		// We always pass these down (otherwise, we'll end up with a infinite loop)
-		if (methodName.equals("hashCode") || methodName.equals("equals") || methodName.equals("toString")) {
-			return proxy.invokeSuper(thisObj, args);
-		}
-		
-		if (override.containsKey(thisObj)) {
-			Object overridenObject = override.get(thisObj);
-			
-			// Cancel EVERYTHING, including "processPacket"
-			if (overridenObject == null)
-				return null;
-			
-			returnValue = proxy.invokeSuper(overridenObject, args);
-		} else {
-			returnValue = proxy.invokeSuper(thisObj, args);
-		}
-		
-		// Is this a readPacketData method?
-		if (returnValue == null && 
-				ArrayUtils.isEquals(method.getParameterTypes(), parameters)) {
-			
-			// We need this in order to get the correct player
-			DataInputStream input = (DataInputStream) args[0];
-			
-			// Let the people know
-			PacketContainer container = new PacketContainer(packetID, (Packet) thisObj);
-			PacketEvent event = packetInjector.packetRecieved(container, input);
-			Packet result = event.getPacket().getHandle();
-			
-			// Handle override
-			if (event != null) {
-				if (event.isCancelled()) {
-					override.put(thisObj, null);
-				} else if (!objectEquals(thisObj, result)) {
-					override.put(thisObj, result);
-				}
-			}
-		}
-		
-		return returnValue;
-	}
-	
-	private boolean objectEquals(Object a, Object b) {
-		return System.identityHashCode(a) != System.identityHashCode(b);
-	}
-}
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.io.DataInputStream;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.WeakHashMap;
+
+import com.comphenix.protocol.Packets;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+class ReadPacketModifier implements MethodInterceptor {
+
+	@SuppressWarnings("rawtypes")
+	private static Class[] parameters = { DataInputStream.class };
+
+	// Common for all packets of the same type
+	private PacketInjector packetInjector;
+	private int packetID;
+	
+	// Whether or not a packet has been cancelled
+	private static WeakHashMap<Object, Object> override = new WeakHashMap<Object, Object>();
+	
+	public ReadPacketModifier(int packetID, PacketInjector packetInjector) {
+		this.packetID = packetID;
+		this.packetInjector = packetInjector;
+	}
+	
+	/**
+	 * Remove any packet overrides.
+	 * @param packet - the packet to rever
+	 */
+	public void removeOverride(Packet packet) {
+		override.remove(packet);
+	}
+	
+	/**
+	 * Retrieve the packet that overrides the methods of the given packet.
+	 * @param packet - the given packet.
+	 * @return Overriden object.
+	 */
+	public Object getOverride(Packet packet) {
+		return override.get(packet);
+	}
+
+	@Override
+	public Object intercept(Object thisObj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+		
+		Object returnValue = null;
+		String methodName = method.getName();
+
+		// We always pass these down (otherwise, we'll end up with a infinite loop)
+		if (methodName.equals("hashCode") || methodName.equals("equals") || methodName.equals("toString")) {
+			return proxy.invokeSuper(thisObj, args);
+		}
+		
+		if (override.containsKey(thisObj)) {
+			Object overridenObject = override.get(thisObj);
+			
+			// This packet has been cancelled
+			if (overridenObject == null) {
+				// So, cancel all void methods
+				if (method.getReturnType().equals(Void.TYPE))
+					return null;
+				else // Revert to normal for everything else
+					overridenObject = thisObj;
+			}
+			
+			returnValue = proxy.invokeSuper(overridenObject, args);
+		} else {
+			returnValue = proxy.invokeSuper(thisObj, args);
+		}
+		
+		// Is this a readPacketData method?
+		if (returnValue == null && 
+				Arrays.equals(method.getParameterTypes(), parameters)) {
+			
+			// We need this in order to get the correct player
+			DataInputStream input = (DataInputStream) args[0];
+
+			// Let the people know
+			PacketContainer container = new PacketContainer(packetID, (Packet) thisObj);
+			PacketEvent event = packetInjector.packetRecieved(container, input);
+			
+			// Handle override
+			if (event != null) {
+				Packet result = event.getPacket().getHandle();
+				
+				if (event.isCancelled()) {
+					override.put(thisObj, null);
+				} else if (!objectEquals(thisObj, result)) {
+					override.put(thisObj, result);
+				}
+				
+				// Update DataInputStream next time
+				if (!event.isCancelled() && packetID == Packets.Server.KEY_RESPONSE) {
+					packetInjector.scheduleDataInputRefresh(event.getPlayer());
+				}
+			}
+		}
+		
+		return returnValue;
+	}
+	
+	private boolean objectEquals(Object a, Object b) {
+		return System.identityHashCode(a) != System.identityHashCode(b);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/SortedPacketListenerList.java

@@ -0,0 +1,83 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.util.Collection;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.comphenix.protocol.concurrency.AbstractConcurrentListenerMultimap;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+
+/**
+ * Registry of synchronous packet listeners.
+ * 
+ * @author Kristian
+ */
+class SortedPacketListenerList extends AbstractConcurrentListenerMultimap<PacketListener> {
+	
+	/**
+	 * Invokes the given packet event for every registered listener.
+	 * @param logger - the logger that will be used to inform about listener exceptions.
+	 * @param event - the packet event to invoke.
+	 */
+	public void invokePacketRecieving(Logger logger, PacketEvent event) {
+		Collection<PrioritizedListener<PacketListener>> list = getListener(event.getPacketID());
+		
+		if (list == null)
+			return;
+
+		// The returned list is thread-safe
+		for (PrioritizedListener<PacketListener> element : list) {
+			try {
+				element.getListener().onPacketReceiving(event);
+			} catch (Throwable e) {
+				// Minecraft doesn't want your Exception.
+				logger.log(Level.SEVERE, 
+						"Exception occured in onPacketReceiving() for " + 
+							PacketAdapter.getPluginName(element.getListener()), e);
+			}
+		}
+	}
+	
+	/**
+	 * Invokes the given packet event for every registered listener.
+	 * @param logger - the logger that will be used to inform about listener exceptions.
+	 * @param event - the packet event to invoke.
+	 */
+	public void invokePacketSending(Logger logger, PacketEvent event) {
+		Collection<PrioritizedListener<PacketListener>> list = getListener(event.getPacketID());
+		
+		if (list == null)
+			return;
+		
+		for (PrioritizedListener<PacketListener> element : list) {
+			try {
+				element.getListener().onPacketSending(event);
+			} catch (Throwable e) {
+				// Minecraft doesn't want your Exception.
+				logger.log(Level.SEVERE, 
+						"Exception occured in onPacketSending() for " + 
+							PacketAdapter.getPluginName(element.getListener()), e);
+			}
+		}
+	}
+	
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/StructureCache.java

@@ -0,0 +1,113 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import net.minecraft.server.Packet;
+
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
+import com.comphenix.protocol.reflect.compiler.CompileListener;
+import com.comphenix.protocol.reflect.compiler.CompiledStructureModifier;
+
+/**
+ * Caches structure modifiers.
+ * @author Kristian
+ */
+public class StructureCache {
+	// Structure modifiers
+	private static ConcurrentMap<Integer, StructureModifier<Object>> structureModifiers = 
+			new ConcurrentHashMap<Integer, StructureModifier<Object>>();
+	
+	private static Set<Integer> compiling = new HashSet<Integer>();
+	
+	/**
+	 * Creates an empty Minecraft packet of the given ID.
+	 * @param id - packet ID.
+	 * @return Created packet.
+	 */
+	public static Packet newPacket(int id) {
+		try {
+			return (Packet) MinecraftRegistry.getPacketClassFromID(id, true).newInstance();
+		} catch (InstantiationException e) {
+			return null;
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Access denied.", e);
+		}
+	}
+	
+	/**
+	 * Retrieve a cached structure modifier for the given packet id.
+	 * @param id - packet ID.
+	 * @return A structure modifier.
+	 */
+	public static StructureModifier<Object> getStructure(int id) {
+		// Compile structures by default
+		return getStructure(id, true);
+	}
+	
+	/**
+	 * Retrieve a cached structure modifier for the given packet id.
+	 * @param id - packet ID.
+	 * @param compile - whether or not to asynchronously compile the structure modifier.
+	 * @return A structure modifier.
+	 */
+	public static StructureModifier<Object> getStructure(int id, boolean compile) {
+		
+		StructureModifier<Object> result = structureModifiers.get(id);
+
+		// We don't want to create this for every lookup
+		if (result == null) {
+			// Use the vanilla class definition
+			final StructureModifier<Object> value = new StructureModifier<Object>(
+					MinecraftRegistry.getPacketClassFromID(id, true), Packet.class, true);
+			
+			result = structureModifiers.putIfAbsent(id, value);
+			
+			// We may end up creating multiple modifiers, but we'll agree on which to use
+			if (result == null) {
+				result = value;
+			}
+		}
+		
+		// Automatically compile the structure modifier
+		if (compile && !(result instanceof CompiledStructureModifier)) {
+			// Compilation is many orders of magnitude slower than synchronization
+			synchronized (compiling) {
+				final int idCopy = id;
+				final BackgroundCompiler compiler = BackgroundCompiler.getInstance();
+				
+				if (!compiling.contains(id) && compiler != null) {
+					compiler.scheduleCompilation(result, new CompileListener<Object>() {
+						@Override
+						public void onCompiled(StructureModifier<Object> compiledModifier) {
+							structureModifiers.put(idCopy, compiledModifier);
+						}
+					});
+					compiling.add(id);
+				}
+			}
+		}
+		
+		return result;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/InjectedArrayList.java

@@ -0,0 +1,132 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Set;
+
+import com.comphenix.protocol.injector.player.NetworkFieldInjector.FakePacket;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+/**
+ * The array list that notifies when packets are sent by the server.
+ * 
+ * @author Kristian
+ */
+class InjectedArrayList extends ArrayList<Packet> {
+
+	/**
+	 * Silly Eclipse.
+	 */
+	private static final long serialVersionUID = -1173865905404280990L;
+	
+	private PlayerInjector injector;
+	private Set<Packet> ignoredPackets;
+	private ClassLoader classLoader;
+	
+	public InjectedArrayList(ClassLoader classLoader, PlayerInjector injector, Set<Packet> ignoredPackets) {
+		this.classLoader = classLoader;
+		this.injector = injector;
+		this.ignoredPackets = ignoredPackets;
+	}
+
+	@Override
+	public boolean add(Packet packet) {
+
+		Packet result = null;
+		
+		// Check for fake packets and ignored packets
+		if (packet instanceof FakePacket) {
+			return true;
+		} else if (ignoredPackets.contains(packet)) {
+			ignoredPackets.remove(packet);
+		} else {
+			result = injector.handlePacketSending(packet);
+		}
+		
+		// A NULL packet indicate cancelling
+		try {
+			if (result != null) {
+				super.add(result);
+			} else {
+				// We'll use the FakePacket marker instead of preventing the filters
+				injector.sendServerPacket(createNegativePacket(packet), true);
+			}
+			
+			// Collection.add contract
+			return true;
+			
+		} catch (InvocationTargetException e) {
+			throw new RuntimeException("Reverting cancelled packet failed.", e.getTargetException());
+		}
+	}
+	
+	/**
+	 * Used by a hack that reverses the effect of a cancelled packet. Returns a packet
+	 * whereby every int method's return value is inverted (a => -a).
+	 * 
+	 * @param source - packet to invert.
+	 * @return The inverted packet.
+	 */
+	Packet createNegativePacket(Packet source) {
+		Enhancer ex = new Enhancer();
+		Class<?> type = source.getClass();
+		
+		// We want to subtract the byte amount that were added to the running
+		// total of outstanding packets. Otherwise, cancelling too many packets
+		// might cause a "disconnect.overflow" error.
+		//
+		// We do that by constructing a special packet of the same type that returns 
+		// a negative integer for all zero-parameter integer methods. This includes the
+		// size() method, which is used by the queue method to count the number of
+		// bytes to add.
+		//
+		// Essentially, we have:
+		//
+		//   public class NegativePacket extends [a packet] {
+		//      @Override
+		//      public int size() {
+		//         return -super.size();
+		//      }
+		//   ect.
+		//   }
+		ex.setInterfaces(new Class[] { FakePacket.class } );
+		ex.setUseCache(true);
+		ex.setClassLoader(classLoader);
+		ex.setSuperclass(type);
+		ex.setCallback(new MethodInterceptor() {
+			@Override
+			public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+				if (method.getReturnType().equals(int.class) && args.length == 0) {
+					Integer result = (Integer) proxy.invokeSuper(obj, args);
+					return -result;
+				} else {
+					return proxy.invokeSuper(obj, args);
+				}
+			}
+		});
+		
+		return (Packet) ex.create();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/InjectedServerConnection.java

@@ -0,0 +1,295 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.minecraft.server.NetLoginHandler;
+import net.sf.cglib.proxy.Factory;
+
+import org.bukkit.Server;
+
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.ObjectCloner;
+import com.comphenix.protocol.reflect.VolatileField;
+
+/**
+ * Used to ensure that the 1.3 server is referencing the correct server handler.
+ * 
+ * @author Kristian
+ */
+class InjectedServerConnection {
+	
+	private static Field listenerThreadField;
+	private static Field minecraftServerField;
+	private static Field listField;
+	private static Field dedicatedThreadField;
+	
+	private static Method serverConnectionMethod;
+	
+	private List<VolatileField> listFields;
+	private List<ReplacedArrayList<Object>> replacedLists;
+
+	// Used to inject net handlers
+	private NetLoginInjector netLoginInjector;
+	
+	private Server server;
+	private Logger logger;
+	private boolean hasAttempted;
+	private boolean hasSuccess;
+	
+	private Object minecraftServer = null;
+	
+	public InjectedServerConnection(Logger logger, Server server, NetLoginInjector netLoginInjector) {
+		this.listFields = new ArrayList<VolatileField>();
+		this.replacedLists = new ArrayList<ReplacedArrayList<Object>>();
+		this.logger = logger;
+		this.server = server;
+		this.netLoginInjector = netLoginInjector;
+	}
+
+	public void injectList() {
+
+		// Only execute this method once
+		if (!hasAttempted)
+			hasAttempted = true;
+		else
+			return;
+		
+		if (minecraftServerField == null)
+			minecraftServerField = FuzzyReflection.fromObject(server, true).getFieldByType(".*MinecraftServer");
+
+		try {
+			minecraftServer = FieldUtils.readField(minecraftServerField, server, true);
+		} catch (IllegalAccessException e1) {
+			logger.log(Level.WARNING, "Cannot extract minecraft server from Bukkit.");
+			return;
+		}
+		
+		try {
+			if (serverConnectionMethod == null)
+				serverConnectionMethod = FuzzyReflection.fromClass(minecraftServerField.getType()).
+											getMethodByParameters("getServerConnection", ".*ServerConnection", new String[] {});
+			// We're using Minecraft 1.3.1
+			injectServerConnection();
+		
+		} catch (IllegalArgumentException e) {
+			// DEBUG
+			logger.log(Level.WARNING, "Reverting to old 1.2.5 server connection injection.", e);
+			
+			// Minecraft 1.2.5 or lower
+			injectListenerThread();
+			
+		} catch (Exception e) {
+			// Oh damn - inform the player
+			logger.log(Level.SEVERE, "Cannot inject into server connection. Bad things will happen.", e);
+		}
+	}
+	
+	private void injectListenerThread() {
+	
+		try {
+		
+		if (listenerThreadField == null)
+			listenerThreadField = FuzzyReflection.fromObject(minecraftServer).
+				getFieldByType(".*NetworkListenThread");
+		} catch (RuntimeException e) {
+			logger.log(Level.SEVERE, "Cannot find listener thread in MinecraftServer.", e);
+			return;
+		}
+
+		Object listenerThread = null;
+		
+		// Attempt to get the thread
+		try {
+			listenerThread = listenerThreadField.get(minecraftServer);
+		} catch (Exception e) {
+			logger.log(Level.WARNING, "Unable to read the listener thread.", e);
+			return;
+		}
+		
+		// Just inject every list field we can get
+		injectEveryListField(listenerThread, 1);
+		hasSuccess = true;
+	}
+	
+	private void injectServerConnection() {
+		
+		Object serverConnection = null;
+		
+		// Careful - we might fail
+		try {
+			serverConnection = serverConnectionMethod.invoke(minecraftServer);
+		} catch (Exception ex) {
+			logger.log(Level.WARNING, "Unable to retrieve server connection", ex);
+			return;
+		}
+		
+		if (listField == null)
+			listField = FuzzyReflection.fromClass(serverConnectionMethod.getReturnType(), true).
+							getFieldByType("netServerHandlerList", List.class);
+		if (dedicatedThreadField == null) {
+			List<Field> matches = FuzzyReflection.fromObject(serverConnection, true).getFieldListByType(Thread.class);
+		
+			// Verify the field count
+			if (matches.size() != 1) 
+				logger.log(Level.WARNING, "Unexpected number of threads in " + serverConnection.getClass().getName());
+			else
+				dedicatedThreadField = matches.get(0);
+		}
+		
+		// Next, try to get the dedicated thread
+		try {
+			if (dedicatedThreadField != null)
+				injectEveryListField(FieldUtils.readField(dedicatedThreadField, serverConnection, true), 1);
+		} catch (IllegalAccessException e) {
+			logger.log(Level.WARNING, "Unable to retrieve net handler thread.", e);
+		}
+		
+		injectIntoList(serverConnection, listField);
+		hasSuccess = true;
+	}
+	
+	/**
+	 * Automatically inject into every List-compatible public or private field of the given object.
+	 * @param container - container object with the fields to inject.
+	 * @param minimum - the minimum number of fields we expect exists.
+	 */
+	private void injectEveryListField(Object container, int minimum) {
+		// Ok, great. Get every list field
+		List<Field> lists = FuzzyReflection.fromObject(container, true).getFieldListByType(List.class);
+		
+		for (Field list : lists) {
+			injectIntoList(container, list);
+		}
+		
+		// Warn about unexpected errors
+		if (lists.size() < minimum) {
+			logger.log(Level.WARNING, "Unable to inject " + minimum + " lists in " + container.getClass().getName());
+		}
+	}
+	
+	@SuppressWarnings("unchecked")
+	private void injectIntoList(Object instance, Field field) {
+		VolatileField listFieldRef = new VolatileField(field, instance, true);
+		List<Object> list = (List<Object>) listFieldRef.getValue();
+
+		// Careful not to inject twice
+		if (list instanceof ReplacedArrayList) {
+			replacedLists.add((ReplacedArrayList<Object>) list);
+		} else {
+			ReplacedArrayList<Object> injectedList = createReplacement(list);
+			
+			replacedLists.add(injectedList);
+			listFieldRef.setValue(injectedList);
+			listFields.add(listFieldRef);
+		}
+	}
+	
+	// Hack to avoid the "moved to quickly" error
+	private ReplacedArrayList<Object> createReplacement(List<Object> list) {
+		return new ReplacedArrayList<Object>(list) {
+			/**
+			 * Shut up Eclipse!
+			 */
+			private static final long serialVersionUID = 2070481080950500367L;
+
+			@Override
+			protected void onReplacing(Object inserting, Object replacement) {
+				// Is this a normal Minecraft object?
+				if (!(inserting instanceof Factory)) {
+					// If so, copy the content of the old element to the new
+					ObjectCloner.copyTo(inserting, replacement, inserting.getClass());
+				}
+			}
+			
+			@Override
+			protected void onInserting(Object inserting) {
+				// Ready for some login handler injection?
+				if (inserting instanceof NetLoginHandler) {
+					Object replaced = netLoginInjector.onNetLoginCreated(inserting); 
+					
+					// Only replace if it has changed
+					if (inserting != replaced)
+						addMapping(inserting, replaced, true);
+				}
+			}
+			
+			@Override
+			protected void onRemoved(Object removing) {
+				// Clean up?
+				if (removing instanceof NetLoginHandler) {
+					netLoginInjector.cleanup(removing);
+				}
+			}
+		};
+	}
+	
+	/**
+	 * Replace the server handler instance kept by the "keep alive" object.
+	 * @param oldHandler - old server handler.
+	 * @param newHandler - new, proxied server handler.
+	 */
+	public void replaceServerHandler(Object oldHandler, Object newHandler) {
+		if (!hasAttempted) {
+			injectList();
+		}
+		
+		if (hasSuccess) {
+			for (ReplacedArrayList<Object> replacedList : replacedLists) {
+				replacedList.addMapping(oldHandler, newHandler);
+			}
+		}
+	}
+	
+	/**
+	 * Revert to the old vanilla server handler, if it has been replaced.
+	 * @param oldHandler - old vanilla server handler.
+	 */
+	public void revertServerHandler(Object oldHandler) {
+		if (hasSuccess) {
+			for (ReplacedArrayList<Object> replacedList : replacedLists) {
+				replacedList.removeMapping(oldHandler);
+			}
+		}
+	}
+	
+	/**
+	 * Undoes everything.
+	 */
+	public void cleanupAll() {
+		if (replacedLists.size() > 0) {
+			// Repair the underlying lists
+			for (ReplacedArrayList<Object> replacedList : replacedLists) {
+				replacedList.revertAll();
+			}
+			for (VolatileField field : listFields) {
+				field.revertValue();
+			}
+			
+			listFields.clear();
+			replacedLists.clear();
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/IntegerSet.java

@@ -0,0 +1,76 @@
+package com.comphenix.protocol.injector.player;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Represents a very quick integer set that uses a lookup table to store membership.
+ * <p>
+ * This class is intentionally missing a size method. 
+ * @author Kristian
+ */
+class IntegerSet {
+	private final boolean[] array;
+
+	/**
+	 * Initialize a lookup table with the given maximum number of elements.
+	 * <p>
+	 * This creates a set for elements in the range [0, count).
+	 * <p>
+	 * Formally, the current set must be a subset of [0, 1, 2, ..., count - 1].
+	 * @param maximumCount - maximum element value and count.
+	 */
+	public IntegerSet(int maximumCount) {
+		this.array = new boolean[maximumCount];
+	}
+	
+	/**
+	 * Determine whether or not the given element exists in the set.
+	 * @param value - the element to check. Must be in the range [0, count).
+	 * @return TRUE if the given element exists, FALSE otherwise.
+	 */
+	public boolean contains(int element) {
+		return array[element];
+	}
+	
+	/**
+	 * Add the given element to the set, or do nothing if it already exists.
+	 * @param element - element to add.
+	 * @throws OutOfBoundsException If the given element is not in the range [0, count).
+	 */
+	public void add(int element) {
+		array[element] = true;
+	}
+	
+	/**
+	 * Remove the given element from the set, or do nothing if it's already removed.
+	 * @param element - element to remove.
+	 */
+	public void remove(int element) {
+		// We don't actually care if the caller tries to remove an element outside the valid set
+		if (element >= 0 && element < array.length)
+			array[element] = false;
+	}
+	
+	/**
+	 * Remove every element from the set.
+	 */
+	public void clear() {
+		Arrays.fill(array, false);
+	}
+	
+	/**
+	 * Convert the current IntegerSet to an equivalent HashSet.
+	 * @return The resulting HashSet.
+	 */
+	public Set<Integer> toSet() {
+		Set<Integer> elements = new HashSet<Integer>();
+		
+		for (int i = 0; i < array.length; i++) {
+			if (array[i])
+				elements.add(i);
+		}
+		return elements;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetLoginInjector.java

@@ -0,0 +1,111 @@
+package com.comphenix.protocol.injector.player;
+
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.player.TemporaryPlayerFactory.InjectContainer;
+import com.google.common.collect.Maps;
+
+/**
+ * Injects every NetLoginHandler created by the server.
+ * 
+ * @author Kristian
+ */
+class NetLoginInjector {
+
+	private ConcurrentMap<Object, PlayerInjector> injectedLogins = Maps.newConcurrentMap();
+	
+	// Handles every hook
+	private PlayerInjectionHandler injectionHandler;
+	private Server server;
+	
+	// The current logger
+	private Logger logger;
+	
+	private ReadWriteLock injectionLock = new ReentrantReadWriteLock();
+	
+	// Used to create fake players
+	private TemporaryPlayerFactory tempPlayerFactory = new TemporaryPlayerFactory();
+	
+	public NetLoginInjector(Logger logger, PlayerInjectionHandler injectionHandler, Server server) {
+		this.logger = logger;
+		this.injectionHandler = injectionHandler;
+		this.server = server;
+	}
+
+	/**
+	 * Invoked when a NetLoginHandler has been created.
+	 * @param inserting - the new NetLoginHandler.
+	 * @return An injected NetLoginHandler, or the original object.
+	 */
+	public Object onNetLoginCreated(Object inserting) {
+		
+		injectionLock.writeLock().lock();
+		
+		try {
+			// Make sure we actually need to inject during this phase
+			if (!injectionHandler.isInjectionNecessary(GamePhase.LOGIN))
+				return inserting;
+			
+			Player fakePlayer = tempPlayerFactory.createTemporaryPlayer(server);
+			PlayerInjector injector = injectionHandler.injectPlayer(fakePlayer, inserting, GamePhase.LOGIN);
+			injector.updateOnLogin = true;
+			
+			// Associate the injector too
+			InjectContainer container = (InjectContainer) fakePlayer;
+			container.setInjector(injector);
+			
+			// NetServerInjector can never work (currently), so we don't need to replace the NetLoginHandler
+			return inserting;	
+			
+		} catch (Throwable e) {
+			// Minecraft can't handle this, so we'll deal with it here
+			logger.log(Level.WARNING, "Unable to hook NetLoginHandler.", e);
+			return inserting;
+			
+		} finally {
+			injectionLock.writeLock().unlock();
+		}
+	}
+	
+	/**
+	 * Retrieve the lock used for reading.
+	 * @return Reading lock.
+	 */
+	public Lock getReadLock() {
+		return injectionLock.readLock();
+	}
+	
+	/**
+	 * Invoked when a NetLoginHandler should be reverted.
+	 * @param inserting - the original NetLoginHandler.
+	 * @return An injected NetLoginHandler, or the original object.
+	 */
+	public synchronized void cleanup(Object removing) {
+		PlayerInjector injected = injectedLogins.get(removing);
+		
+		if (injected != null) {
+			injected.cleanupAll();
+			injectedLogins.remove(removing);
+		}
+	}
+	
+	/**
+	 * Remove all injected hooks.
+	 */
+	public void cleanupAll() {
+		for (PlayerInjector injector : injectedLogins.values()) {
+			injector.cleanupAll();
+		}
+		
+		injectedLogins.clear();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkFieldInjector.java

@@ -0,0 +1,204 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Logger;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.Packets;
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.ListenerInvoker;
+import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.VolatileField;
+import com.google.common.collect.Sets;
+
+import net.minecraft.server.Packet;
+
+/**
+ * Injection hook that overrides the packet queue lists in NetworkHandler.
+ * 
+ * @author Kristian
+ */
+class NetworkFieldInjector extends PlayerInjector {
+
+	/**
+	 * Marker interface that indicates a packet is fake and should not be processed.
+	 * @author Kristian
+	 */
+	public interface FakePacket {
+		// Nothing
+	}
+	
+	// Packets to ignore
+	private Set<Packet> ignoredPackets = Sets.newSetFromMap(new ConcurrentHashMap<Packet, Boolean>());
+	
+	// Overridden fields
+	private List<VolatileField> overridenLists = new ArrayList<VolatileField>();
+	
+	// Sync field
+	private static Field syncField;
+	private Object syncObject;
+
+	// Determine if we're listening
+	private IntegerSet sendingFilters;
+
+	// Used to construct proxy objects
+	private ClassLoader classLoader;
+	
+	public NetworkFieldInjector(ClassLoader classLoader, Logger logger, Player player, 
+								ListenerInvoker manager, IntegerSet sendingFilters) throws IllegalAccessException {
+		
+		super(logger, player, manager);
+		this.classLoader = classLoader;
+		this.sendingFilters = sendingFilters;
+	}
+	
+	@Override
+	protected boolean hasListener(int packetID) {
+		return sendingFilters.contains(packetID);
+	}
+	
+	@Override
+	public synchronized void initialize(Object injectionSource)  throws IllegalAccessException {
+		super.initialize(injectionSource);
+
+		// Get the sync field as well
+		if (hasInitialized) {
+			if (syncField == null)
+				syncField = FuzzyReflection.fromObject(networkManager, true).getFieldByType("java\\.lang\\.Object");
+			syncObject = FieldUtils.readField(syncField, networkManager, true);
+		}
+	}
+
+	@Override
+	public void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException {
+		
+		if (networkManager != null) {
+			try {
+				if (!filtered) {
+					ignoredPackets.add(packet);
+				}
+				
+				// Note that invocation target exception is a wrapper for a checked exception
+				queueMethod.invoke(networkManager, packet);
+				
+			} catch (IllegalArgumentException e) {
+				throw e;
+			} catch (InvocationTargetException e) {
+				throw e;
+			} catch (IllegalAccessException e) {
+				throw new IllegalStateException("Unable to access queue method.", e);
+			}
+		} else {
+			throw new IllegalStateException("Unable to load network mananager. Cannot send packet.");
+		}
+	}
+	
+	@Override
+	public void checkListener(PacketListener listener) {
+		// Unfortunately, we don't support chunk packets
+		if (ListeningWhitelist.containsAny(listener.getSendingWhitelist(), 
+				Packets.Server.MAP_CHUNK, Packets.Server.MAP_CHUNK_BULK)) {
+			throw new IllegalStateException("The NETWORK_FIELD_INJECTOR hook doesn't support map chunk listeners.");
+		}
+	}
+	
+	@Override
+	public void injectManager() {
+		
+		if (networkManager != null) {
+
+			@SuppressWarnings("rawtypes")
+			StructureModifier<List> list = networkModifier.withType(List.class);
+
+			// Subclass both send queues
+			for (Field field : list.getFields()) {
+				VolatileField overwriter = new VolatileField(field, networkManager, true);
+				
+				@SuppressWarnings("unchecked")
+				List<Packet> minecraftList = (List<Packet>) overwriter.getOldValue();
+				
+				synchronized(syncObject) {
+					// The list we'll be inserting
+					List<Packet> hackedList = new InjectedArrayList(classLoader, this, ignoredPackets);
+					
+					// Add every previously stored packet
+					for (Packet packet : minecraftList) {
+						hackedList.add(packet);
+					}
+					
+					// Don' keep stale packets around
+					minecraftList.clear();
+					overwriter.setValue(Collections.synchronizedList(hackedList));
+				}
+				
+				overridenLists.add(overwriter);
+			}
+		}
+	}
+	
+	@SuppressWarnings("unchecked")
+	public void cleanupAll() {
+		// Clean up
+		for (VolatileField overriden : overridenLists) {
+			List<Packet> minecraftList = (List<Packet>) overriden.getOldValue();
+			List<Packet> hacketList = (List<Packet>) overriden.getValue();
+			
+			if (minecraftList == hacketList) {
+				return;
+			}
+	
+			// Get a lock before we modify the list
+			synchronized(syncObject) {
+				try {
+					// Copy over current packets
+					for (Packet packet : (List<Packet>) overriden.getValue()) {
+						minecraftList.add(packet);
+					}
+				} finally {
+					overriden.revertValue();
+				}
+			}
+		}
+		overridenLists.clear();
+	}
+
+	@Override
+	public boolean canInject(GamePhase phase) {
+		// All phases should work
+		return true;
+	}
+
+	@Override
+	public PlayerInjectHooks getHookType() {
+		return PlayerInjectHooks.NETWORK_HANDLER_FIELDS;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkObjectInjector.java

@@ -0,0 +1,172 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.InvocationTargetException;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Callback;
+import net.sf.cglib.proxy.CallbackFilter;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.LazyLoader;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+
+import java.lang.reflect.Method;
+import java.util.logging.Logger;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.Packets;
+import com.comphenix.protocol.events.ListeningWhitelist;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.ListenerInvoker;
+import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+
+/**
+ * Injection method that overrides the NetworkHandler itself, and it's sendPacket-method.
+ * 
+ * @author Kristian
+ */
+class NetworkObjectInjector extends PlayerInjector {
+	// Determine if we're listening
+	private IntegerSet sendingFilters;
+	
+	// Used to construct proxy objects
+	private ClassLoader classLoader;
+	
+	public NetworkObjectInjector(ClassLoader classLoader, Logger logger, Player player, 
+								 ListenerInvoker invoker, IntegerSet sendingFilters) throws IllegalAccessException {
+		super(logger, player, invoker);
+		this.sendingFilters = sendingFilters;
+		this.classLoader = classLoader;
+	}
+
+	@Override
+	protected boolean hasListener(int packetID) {
+		return sendingFilters.contains(packetID);
+	}
+	
+	@Override
+	public void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException {
+		Object networkDelegate = filtered ? networkManagerRef.getValue() : networkManagerRef.getOldValue();
+		
+		if (networkDelegate != null) {
+			try {
+				// Note that invocation target exception is a wrapper for a checked exception
+				queueMethod.invoke(networkDelegate, packet);
+				
+			} catch (IllegalArgumentException e) {
+				throw e;
+			} catch (InvocationTargetException e) {
+				throw e;
+			} catch (IllegalAccessException e) {
+				throw new IllegalStateException("Unable to access queue method.", e);
+			}
+		} else {
+			throw new IllegalStateException("Unable to load network mananager. Cannot send packet.");
+		}
+	}
+	
+	@Override
+	public void checkListener(PacketListener listener) {
+		// Unfortunately, we don't support chunk packets
+		if (ListeningWhitelist.containsAny(listener.getSendingWhitelist(), 
+				Packets.Server.MAP_CHUNK, Packets.Server.MAP_CHUNK_BULK)) {
+			throw new IllegalStateException("The NETWORK_FIELD_INJECTOR hook doesn't support map chunk listeners.");
+		}
+	}
+	
+	@Override
+	public void injectManager() {
+		
+		if (networkManager != null) {
+			final Class<?> networkInterface = networkManagerRef.getField().getType();
+			final Object networkDelegate = networkManagerRef.getOldValue();
+			
+			if (!networkInterface.isInterface()) {
+				throw new UnsupportedOperationException(
+						"Must use CraftBukkit 1.3.0 or later to inject into into NetworkMananger.");
+			}
+			
+			Callback queueFilter = new MethodInterceptor() {
+				@Override
+				public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+					Packet packet = (Packet) args[0];
+					
+					if (packet != null) {
+						packet = handlePacketSending(packet);
+						
+						// A NULL packet indicate cancelling
+						if (packet != null)
+							args[0] = packet;
+						else
+							return null;
+					}
+					
+					// Delegate to our underlying class
+					return proxy.invokeSuper(networkDelegate, args);
+				}
+			};
+			Callback dispatch = new LazyLoader() {
+				@Override
+				public Object loadObject() throws Exception {
+					return networkDelegate;
+				}
+			};
+			
+			// Create our proxy object
+			Enhancer ex = new Enhancer();
+			ex.setClassLoader(classLoader);
+			ex.setSuperclass(networkInterface);
+			ex.setCallbacks(new Callback[] { queueFilter, dispatch });
+			ex.setCallbackFilter(new CallbackFilter() {
+				@Override
+				public int accept(Method method) {
+					if (method.equals(queueMethod))
+						return 0;
+					else
+						return 1;
+				}
+			});
+			
+			// Inject it, if we can.
+			networkManagerRef.setValue(ex.create());
+		}
+	}
+	
+	@Override
+	public void cleanupAll() {
+		// Clean up
+		if (networkManagerRef != null && networkManagerRef.isCurrentSet()) {
+			networkManagerRef.revertValue();
+		}
+	}
+
+	@Override
+	public boolean canInject(GamePhase phase) {
+		// Works for all phases
+		return true;
+	}
+
+	@Override
+	public PlayerInjectHooks getHookType() {
+		return PlayerInjectHooks.NETWORK_MANAGER_OBJECT;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/NetworkServerInjector.java

@@ -0,0 +1,273 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.logging.Logger;
+
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Callback;
+import net.sf.cglib.proxy.CallbackFilter;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.Factory;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+import net.sf.cglib.proxy.NoOp;
+
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.ListenerInvoker;
+import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.ObjectCloner;
+import com.comphenix.protocol.reflect.VolatileField;
+import com.comphenix.protocol.reflect.instances.DefaultInstances;
+import com.comphenix.protocol.reflect.instances.ExistingGenerator;
+
+/**
+ * Represents a player hook into the NetServerHandler class. 
+ * 
+ * @author Kristian
+ */
+public class NetworkServerInjector extends PlayerInjector {
+
+	private static Method sendPacketMethod;
+	private InjectedServerConnection serverInjection;
+	
+	// Determine if we're listening
+	private IntegerSet sendingFilters;
+	
+	// Used to create proxy objects
+	private ClassLoader classLoader;
+	
+	public NetworkServerInjector(
+			ClassLoader classLoader, Logger logger, Player player, 
+			ListenerInvoker invoker, IntegerSet sendingFilters, 
+			InjectedServerConnection serverInjection) throws IllegalAccessException {
+		
+		super(logger, player, invoker);
+		this.classLoader = classLoader;
+		this.sendingFilters = sendingFilters;
+		this.serverInjection = serverInjection;
+	}
+	
+	@Override
+	protected boolean hasListener(int packetID) {
+		return sendingFilters.contains(packetID);
+	}
+
+	@Override
+	public void initialize(Object injectionSource) throws IllegalAccessException {
+		super.initialize(injectionSource);
+
+		// Get the send packet method!
+		if (hasInitialized) {
+			if (sendPacketMethod == null)
+				sendPacketMethod = FuzzyReflection.fromObject(serverHandler).getMethodByName("sendPacket.*");
+		}
+	}
+
+	@Override
+	public void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException {
+		Object serverDeleage = filtered ? serverHandlerRef.getValue() : serverHandlerRef.getOldValue();
+		
+		if (serverDeleage != null) {
+			try {
+				// Note that invocation target exception is a wrapper for a checked exception
+				sendPacketMethod.invoke(serverDeleage, packet);
+				
+			} catch (IllegalArgumentException e) {
+				throw e;
+			} catch (InvocationTargetException e) {
+				throw e;
+			} catch (IllegalAccessException e) {
+				throw new IllegalStateException("Unable to access send packet method.", e);
+			}
+		} else {
+			throw new IllegalStateException("Unable to load server handler. Cannot send packet.");
+		}
+	}
+
+	@Override
+	public void injectManager() {
+		
+		if (serverHandlerRef == null)
+			throw new IllegalStateException("Cannot find server handler.");
+		// Don't inject twice
+		if (serverHandlerRef.getValue() instanceof Factory)
+			return;
+		
+		if (!tryInjectManager()) {
+			
+			// Try to override the proxied object
+			if (proxyServerField != null) {
+				serverHandlerRef = new VolatileField(proxyServerField, serverHandler, true);
+				serverHandler = serverHandlerRef.getValue();
+				
+				if (serverHandler == null)
+					throw new RuntimeException("Cannot hook player: Inner proxy object is NULL.");
+				
+				// Try again
+				if (tryInjectManager()) {
+					// It worked - probably
+					return;
+				}
+			}
+			
+			throw new RuntimeException(
+					"Cannot hook player: Unable to find a valid constructor for the NetServerHandler object.");
+		}
+	}
+	
+	private boolean tryInjectManager() {
+		Class<?> serverClass = serverHandler.getClass();
+		
+		Enhancer ex = new Enhancer();
+		Callback sendPacketCallback = new MethodInterceptor() {
+			@Override
+			public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+
+				Packet packet = (Packet) args[0];
+				
+				if (packet != null) {
+					packet = handlePacketSending(packet);
+					
+					// A NULL packet indicate cancelling
+					if (packet != null)
+						args[0] = packet;
+					else
+						return null;
+				}
+				
+				// Call the method directly
+				return proxy.invokeSuper(obj, args);
+			};
+		};
+		Callback noOpCallback = NoOp.INSTANCE;
+
+		ex.setClassLoader(classLoader);
+		ex.setSuperclass(serverClass);
+		ex.setCallbacks(new Callback[] { sendPacketCallback, noOpCallback });
+		ex.setCallbackFilter(new CallbackFilter() {
+			@Override
+			public int accept(Method method) {
+				if (method.equals(sendPacketMethod))
+					return 0;
+				else
+					return 1;
+			}
+		});
+		
+		// Find the Minecraft NetServerHandler superclass
+		Class<?> minecraftSuperClass = getFirstMinecraftSuperClass(serverHandler.getClass());
+		ExistingGenerator generator = ExistingGenerator.fromObjectFields(serverHandler, minecraftSuperClass);
+		DefaultInstances serverInstances = null;
+		
+		// Maybe the proxy instance can help?
+		Object proxyInstance = getProxyServerHandler();
+		
+		// Use the existing server proxy when we create one
+		if (proxyInstance != null && proxyInstance != serverHandler) {
+			serverInstances = DefaultInstances.fromArray(generator, 
+					ExistingGenerator.fromObjectArray(new Object[] { proxyInstance }));
+		} else {
+			serverInstances = DefaultInstances.fromArray(generator);
+		}
+		
+		serverInstances.setNonNull(true);
+		serverInstances.setMaximumRecursion(1);
+		
+		Object proxyObject = serverInstances.forEnhancer(ex).getDefault(serverClass);
+		
+		// Inject it now
+		if (proxyObject != null) {
+			// This will be done by InjectedServerConnection instead
+			//copyTo(serverHandler, proxyObject);
+			serverInjection.replaceServerHandler(serverHandler, proxyObject);
+			serverHandlerRef.setValue(proxyObject);
+			return true;
+		} else {
+			return false;
+		}
+	}
+	
+	private Object getProxyServerHandler() {
+		if (proxyServerField != null && !proxyServerField.equals(serverHandlerRef.getField())) {
+			try {
+				return FieldUtils.readField(proxyServerField, serverHandler, true);
+			} catch (Throwable e) {
+				// Oh well
+			}
+		}
+		
+		return null;
+	}
+	
+	private Class<?> getFirstMinecraftSuperClass(Class<?> clazz) {
+		if (clazz.getName().startsWith("net.minecraft.server."))
+			return clazz;
+		else if (clazz.equals(Object.class))
+			return clazz;
+		else
+			return getFirstMinecraftSuperClass(clazz.getSuperclass());
+	}
+		
+	@Override
+	public void cleanupAll() {
+		if (serverHandlerRef != null && serverHandlerRef.isCurrentSet()) {
+			ObjectCloner.copyTo(serverHandlerRef.getValue(), serverHandlerRef.getOldValue(), serverHandler.getClass());
+			serverHandlerRef.revertValue();
+			
+			try {
+				if (getNetHandler() != null) {
+					// Restore packet listener
+					try {
+						FieldUtils.writeField(netHandlerField, networkManager, serverHandlerRef.getOldValue(), true);
+					} catch (IllegalAccessException e) {
+						// Oh well
+						e.printStackTrace();
+					}
+				}
+			} catch (IllegalAccessException e) {
+				e.printStackTrace();
+			}
+		}
+
+		serverInjection.revertServerHandler(serverHandler);
+	}
+	
+	@Override
+	public void checkListener(PacketListener listener) {
+		// We support everything
+	}
+
+	@Override
+	public boolean canInject(GamePhase phase) {
+		// Doesn't work when logging in
+		return phase == GamePhase.PLAYING;
+	}
+
+	@Override
+	public PlayerInjectHooks getHookType() {
+		return PlayerInjectHooks.NETWORK_SERVER_OBJECT;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjectionHandler.java

@@ -0,0 +1,540 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.io.DataInputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.minecraft.server.Packet;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.ListenerInvoker;
+import com.comphenix.protocol.injector.PlayerLoggedOutException;
+import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+import com.google.common.base.Predicate;
+import com.google.common.collect.Maps;
+
+/**
+ * Responsible for injecting into a player's sendPacket method.
+ * 
+ * @author Kristian
+ */
+public class PlayerInjectionHandler {
+	
+	/**
+	 * The highest possible packet ID. It's unlikely that this value will ever change.
+	 */
+	private static final int MAXIMUM_PACKET_ID = 255;
+	
+	// Server connection injection
+	private InjectedServerConnection serverInjection;
+	
+	// NetLogin injector
+	private NetLoginInjector netLoginInjector;
+	
+	// The last successful player hook
+	private PlayerInjector lastSuccessfulHook;
+	
+	// Player injection
+	private Map<SocketAddress, PlayerInjector> addressLookup = Maps.newConcurrentMap();
+	private Map<DataInputStream, PlayerInjector> dataInputLookup = Maps.newConcurrentMap();
+	private Map<Player, PlayerInjector> playerInjection = Maps.newConcurrentMap();
+	
+	// Player injection types
+	private volatile PlayerInjectHooks loginPlayerHook = PlayerInjectHooks.NETWORK_SERVER_OBJECT;
+	private volatile PlayerInjectHooks playingPlayerHook = PlayerInjectHooks.NETWORK_SERVER_OBJECT;
+	
+	// Error logger
+	private Logger logger;
+	
+	// Whether or not we're closing
+	private boolean hasClosed;
+
+	// Used to invoke events
+	private ListenerInvoker invoker;
+	
+	// Enabled packet filters
+	private IntegerSet sendingFilters = new IntegerSet(MAXIMUM_PACKET_ID + 1);
+	
+	// The class loader we're using
+	private ClassLoader classLoader;
+	
+	// Used to filter injection attempts
+	private Predicate<GamePhase> injectionFilter;
+	
+	public PlayerInjectionHandler(ClassLoader classLoader, Logger logger, Predicate<GamePhase> injectionFilter, 
+								  ListenerInvoker invoker, Server server) {
+		
+		this.classLoader = classLoader;
+		this.logger = logger;
+		this.invoker = invoker;
+		this.injectionFilter = injectionFilter;
+		this.netLoginInjector = new NetLoginInjector(logger, this, server);
+		this.serverInjection = new InjectedServerConnection(logger, server, netLoginInjector);
+		serverInjection.injectList();
+	}
+
+	/**
+	 * Retrieves how the server packets are read.
+	 * @return Injection method for reading server packets.
+	 */
+	public PlayerInjectHooks getPlayerHook() {
+		return getPlayerHook(GamePhase.PLAYING);
+	}
+	
+	/**
+	 * Retrieves how the server packets are read.
+	 * @param phase - the current game phase.
+	 * @return Injection method for reading server packets.
+	 */
+	public PlayerInjectHooks getPlayerHook(GamePhase phase) {
+		switch (phase) {
+		case LOGIN:
+			return loginPlayerHook;
+		case PLAYING:
+			return playingPlayerHook;
+		default: 
+			throw new IllegalArgumentException("Cannot retrieve injection hook for both phases at the same time.");
+		}
+	}
+
+	/**
+	 * Sets how the server packets are read.
+	 * @param playerHook - the new injection method for reading server packets.
+	 */
+	public void setPlayerHook(PlayerInjectHooks playerHook) {
+		setPlayerHook(GamePhase.PLAYING, playerHook);
+	}
+	
+	/**
+	 * Sets how the server packets are read.
+	 * @param phase - the current game phase.
+	 * @param playerHook - the new injection method for reading server packets.
+	 */
+	public void setPlayerHook(GamePhase phase, PlayerInjectHooks playerHook) {
+		if (phase.hasLogin())
+			loginPlayerHook = playerHook;
+		if (phase.hasPlaying())
+			playingPlayerHook = playerHook;
+	}
+	
+	/**
+	 * Add an underlying packet handler of the given ID.
+	 * @param packetID - packet ID to register.
+	 */
+	public void addPacketHandler(int packetID) {
+		sendingFilters.add(packetID);
+	}
+	
+	/**
+	 * Remove an underlying packet handler of ths ID.  
+	 * @param packetID - packet ID to unregister.
+	 */
+	public void removePacketHandler(int packetID) {
+		sendingFilters.remove(packetID);
+	}
+
+	/**
+	 * Used to construct a player hook.
+	 * @param player - the player to hook.
+	 * @param hook - the hook type.
+	 * @return A new player hoook
+	 * @throws IllegalAccessException Unable to do our reflection magic.
+	 */
+	private PlayerInjector getHookInstance(Player player, PlayerInjectHooks hook) throws IllegalAccessException {
+		// Construct the correct player hook
+		switch (hook) {
+		case NETWORK_HANDLER_FIELDS: 
+			return new NetworkFieldInjector(classLoader, logger, player, invoker, sendingFilters);
+		case NETWORK_MANAGER_OBJECT: 
+			return new NetworkObjectInjector(classLoader, logger, player, invoker, sendingFilters);
+		case NETWORK_SERVER_OBJECT:
+			return new NetworkServerInjector(classLoader, logger, player, invoker, sendingFilters, serverInjection);
+		default:
+			throw new IllegalArgumentException("Cannot construct a player injector.");
+		}
+	}
+	
+	/**
+	 * Retrieve a player by its DataInput connection.
+	 * @param inputStream - the associated DataInput connection.
+	 * @return The player.
+	 */
+	public Player getPlayerByConnection(DataInputStream inputStream) {
+		try {
+			// Concurrency issue!
+			netLoginInjector.getReadLock().lock();
+			
+			PlayerInjector injector = dataInputLookup.get(inputStream);
+			
+			if (injector != null) {
+				return injector.getPlayer();
+			} else {
+				System.out.println("Unable to find stream: " + inputStream);
+				return null;
+			}
+			
+		} finally {
+			netLoginInjector.getReadLock().unlock();
+		}
+	}
+	
+	private PlayerInjectHooks getInjectorType(PlayerInjector injector) {
+		return injector != null ? injector.getHookType() : PlayerInjectHooks.NONE;
+	}
+	
+	/**
+	 * Initialize a player hook, allowing us to read server packets.
+	 * <p>
+	 * This call will  be ignored if there's no listener that can receive the given events.
+	 * @param player - player to hook.
+	 */
+	public void injectPlayer(Player player) {
+		// Inject using the player instance itself
+		if (isInjectionNecessary(GamePhase.PLAYING)) {
+			injectPlayer(player, player, GamePhase.PLAYING);
+		}
+	}
+	
+	/**
+	 * Determine if it's truly necessary to perform the given player injection.
+	 * @param phase - current game phase.
+	 * @return TRUE if we should perform the injection, FALSE otherwise.
+	 */
+	public boolean isInjectionNecessary(GamePhase phase) {
+		return injectionFilter.apply(phase);
+	}
+	
+	/**
+	 * Initialize a player hook, allowing us to read server packets.
+	 * <p>
+	 * This method will always perform the instructed injection.
+	 * 
+	 * @param player - player to hook.
+	 * @param injectionPoint - the object to use during the injection process.
+	 * @param phase - the current game phase.
+	 * @return The resulting player injector, or NULL if the injection failed.
+	 */
+	PlayerInjector injectPlayer(Player player, Object injectionPoint, GamePhase phase) {
+		// Unfortunately, due to NetLoginHandler, multiple threads may potentially call this method.
+		synchronized (player) {
+			return injectPlayerInternal(player, injectionPoint, phase);
+		}
+	}
+	
+	// Unsafe variant of the above
+	private PlayerInjector injectPlayerInternal(Player player, Object injectionPoint, GamePhase phase) {
+		
+		PlayerInjector injector = playerInjection.get(player);
+		PlayerInjectHooks tempHook = getPlayerHook(phase);
+		PlayerInjectHooks permanentHook = tempHook;
+		
+		// The given player object may be fake, so be careful!
+		
+		// See if we need to inject something else
+		boolean invalidInjector = injector != null ? !injector.canInject(phase) : true;
+
+		// Don't inject if the class has closed
+		if (!hasClosed && player != null && (tempHook != getInjectorType(injector) || invalidInjector)) {
+			while (tempHook != PlayerInjectHooks.NONE) {
+				// Whether or not the current hook method failed completely
+				boolean hookFailed = false;
+
+				// Remove the previous hook, if any
+				cleanupHook(injector);
+				
+				try {
+					injector = getHookInstance(player, tempHook);
+					
+					// Make sure this injection method supports the current game phase
+					if (injector.canInject(phase)) {
+						injector.initialize(injectionPoint);
+						
+						DataInputStream inputStream = injector.getInputStream(false);
+
+						Socket socket = injector.getSocket();
+						SocketAddress address = socket.getRemoteSocketAddress();
+						
+						// Make sure the current player is not logged out
+						if (socket.isClosed()) {
+							throw new PlayerLoggedOutException();
+						}
+						
+						PlayerInjector previous = addressLookup.get(address);
+						
+						// Close any previously associated hooks before we proceed
+						if (previous != null) {
+							uninjectPlayer(previous.getPlayer());
+
+							// Remove the "hooked" network manager in our instance as well
+							if (previous instanceof NetworkObjectInjector) {
+								injector.setNetworkManager(previous.getNetworkManager(), true);
+							}
+						}
+
+						injector.injectManager();
+						dataInputLookup.put(inputStream, injector);
+						addressLookup.put(address, injector);
+						break;
+					}
+					
+				} catch (PlayerLoggedOutException e) {
+					throw e;
+					
+				} catch (Exception e) {
+					// Mark this injection attempt as a failure
+					logger.log(Level.SEVERE, "Player hook " + tempHook.toString() + " failed.", e);
+					hookFailed = true;
+				}
+				
+				// Choose the previous player hook type
+				tempHook = PlayerInjectHooks.values()[tempHook.ordinal() - 1];
+				
+				if (hookFailed)
+					logger.log(Level.INFO, "Switching to " + tempHook.toString() + " instead.");
+				
+				// Check for UTTER FAILURE
+				if (tempHook == PlayerInjectHooks.NONE) {
+					cleanupHook(injector);
+					injector = null;
+					hookFailed = true;
+				}
+				
+				// Should we set the default hook method too?
+				if (hookFailed) {
+					permanentHook = tempHook;
+				}
+			}
+			
+			// Update values
+			if (injector != null)
+				lastSuccessfulHook = injector;
+			if (permanentHook != getPlayerHook(phase)) 
+				setPlayerHook(phase, tempHook);
+			
+			// Save last injector
+			playerInjection.put(player, injector);
+		}
+		
+		return injector;
+	}
+	
+	private void cleanupHook(PlayerInjector injector) {
+		// Clean up as much as possible
+		try {
+			if (injector != null)
+				injector.cleanupAll();
+		} catch (Exception e2) {
+			logger.log(Level.WARNING, "Cleaing up after player hook failed.", e2);
+		}
+	}
+	
+	/**
+	 * Unregisters the given player.
+	 * @param player - player to unregister.
+	 */
+	public void uninjectPlayer(Player player) {
+		if (!hasClosed && player != null) {
+			
+			PlayerInjector injector = playerInjection.remove(player);
+
+			if (injector != null) {
+				DataInputStream input = injector.getInputStream(true);
+				InetSocketAddress address = player.getAddress();
+				injector.cleanupAll();
+				
+				dataInputLookup.remove(input);
+				
+				if (address != null)
+					addressLookup.remove(address);
+			}
+		}	
+	}
+	
+	/**
+	 * Unregisters a player by the given address.
+	 * @param address - address of the player to unregister.
+	 */
+	public void uninjectPlayer(InetSocketAddress address) {
+		if (!hasClosed && address != null) {
+			PlayerInjector injector = addressLookup.get(address);
+			
+			// Clean up
+			if (injector != null)
+				uninjectPlayer(injector.getPlayer());
+		}
+	}
+	
+	/**
+	 * Send the given packet to the given reciever.
+	 * @param reciever - the player receiver.
+	 * @param packet - the packet to send.
+	 * @param filters - whether or not to invoke the packet filters.
+	 * @throws InvocationTargetException If an error occured during sending.
+	 */
+	public void sendServerPacket(Player reciever, PacketContainer packet, boolean filters) throws InvocationTargetException {
+		PlayerInjector injector = getInjector(reciever);
+		
+		// Send the packet, or drop it completely
+		if (injector != null)
+			injector.sendServerPacket(packet.getHandle(), filters);
+		else
+			logger.log(Level.WARNING, String.format(
+					"Unable to send packet %s (%s): Player %s has logged out.", 
+					packet.getID(), packet, reciever.getName()
+			));
+	}
+	
+	/**
+	 * Process a packet as if it were sent by the given player.
+	 * @param player - the sender.
+	 * @param mcPacket - the packet to process.
+	 * @throws IllegalAccessException If the reflection machinery failed.
+	 * @throws InvocationTargetException If the underlying method caused an error.
+	 */
+	public void processPacket(Player player, Packet mcPacket) throws IllegalAccessException, InvocationTargetException {
+		
+		PlayerInjector injector = getInjector(player);
+		
+		// Process the given packet, or simply give up
+		if (injector != null)
+			injector.processPacket(mcPacket);
+		else
+			logger.log(Level.WARNING, String.format(
+					"Unable to receieve packet %s. Player %s has logged out.", 
+					mcPacket, player.getName()
+			));
+	}
+	
+	/**
+	 * Retrieve the injector associated with this player.
+	 * @param player - the player to find.
+	 * @return The injector, or NULL if not found.
+	 */
+	private PlayerInjector getInjector(Player player) {
+		return playerInjection.get(player);
+	}
+	
+	/**
+	 * Determine if the given listeners are valid.
+	 * @param listeners - listeners to check.
+	 */
+	public void checkListener(Set<PacketListener> listeners) {
+		// Make sure the current listeners are compatible
+		if (lastSuccessfulHook != null) {
+			for (PacketListener listener : listeners) {
+				try {
+					checkListener(listener);
+				} catch (IllegalStateException e) {
+					logger.log(Level.WARNING, "Unsupported listener.", e);
+				}
+			}
+		}
+	}
+	
+	/**
+	 * Determine if a listener is valid or not.
+	 * @param listener - listener to check.
+	 * @throws IllegalStateException If the given listener's whitelist cannot be fulfilled.
+	 */
+	public void checkListener(PacketListener listener) {
+		try {
+			if (lastSuccessfulHook != null)
+				lastSuccessfulHook.checkListener(listener);
+		} catch (Exception e) {
+			throw new IllegalStateException("Registering listener " + PacketAdapter.getPluginName(listener) + " failed", e);
+		}
+	}
+	
+	/**
+	 * Retrieve the current list of registered sending listeners.
+	 * @return List of the sending listeners's packet IDs.
+	 */
+	public Set<Integer> getSendingFilters() {
+		return sendingFilters.toSet();
+	}
+	
+	/**
+	 * Retrieve the current logger.
+	 * @return Error logger.
+	 */
+	public Logger getLogger() {
+		return logger;
+	}
+
+	public void close() {
+		
+		// Guard
+		if (hasClosed || playerInjection == null)
+			return;
+
+		// Remove everything
+		for (PlayerInjector injection : playerInjection.values()) {
+			if (injection != null) {
+				injection.cleanupAll();
+			}
+		}
+		
+		// Remove server handler
+		if (serverInjection != null)
+			serverInjection.cleanupAll();
+		if (netLoginInjector != null)
+			netLoginInjector.cleanupAll();
+		serverInjection = null;
+		netLoginInjector = null;
+		hasClosed = true;
+		
+		playerInjection.clear();
+		dataInputLookup.clear();
+		addressLookup.clear();
+		invoker = null;
+	}
+
+	/**
+	 * Inform the current PlayerInjector that it should update the DataInputStream next.
+	 * @param player - the player to update.
+	 */
+	public void scheduleDataInputRefresh(Player player) {
+		final PlayerInjector injector = getInjector(player);
+		final DataInputStream old = injector.getInputStream(true);
+		
+		// Update the DataInputStream
+		if (injector != null) {
+			injector.scheduleAction(new Runnable() {
+				@Override
+				public void run() {
+					dataInputLookup.remove(old);
+					dataInputLookup.put(injector.getInputStream(false), injector);
+				}
+			});
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/PlayerInjector.java

@@ -0,0 +1,557 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.Socket;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.NetLoginHandler;
+import net.minecraft.server.Packet;
+import net.sf.cglib.proxy.Factory;
+
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.Packets;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.injector.GamePhase;
+import com.comphenix.protocol.injector.ListenerInvoker;
+import com.comphenix.protocol.injector.PacketFilterManager.PlayerInjectHooks;
+import com.comphenix.protocol.reflect.FieldUtils;
+import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.VolatileField;
+
+abstract class PlayerInjector {
+
+	// Net login handler stuff
+	private static Field netLoginNetworkField;
+	
+	// Different disconnect methods
+	private static Method loginDisconnect;
+	private static Method serverDisconnect;
+	
+	// Cache previously retrieved fields
+	protected static Field serverHandlerField;
+	protected static Field proxyServerField;
+
+	protected static Field networkManagerField;
+	protected static Field inputField;
+	protected static Field netHandlerField;
+	protected static Field socketField;
+	
+	private static Field entityPlayerField;
+	
+	// Whether or not we're using a proxy type
+	private static boolean hasProxyType;
+	
+	// To add our injected array lists
+	protected static StructureModifier<Object> networkModifier;
+	
+	// And methods
+	protected static Method queueMethod;
+	protected static Method processMethod;
+		
+	protected Player player;
+	protected boolean hasInitialized;
+	
+	// Reference to the player's network manager
+	protected VolatileField networkManagerRef;
+	protected VolatileField serverHandlerRef;
+	protected Object networkManager;
+	
+	// Current net handler
+	protected Object loginHandler;
+	protected Object serverHandler;
+	protected Object netHandler;
+	
+	// Current socket
+	protected Socket socket;
+	
+	// The packet manager and filters
+	protected ListenerInvoker invoker;
+	
+	// Previous data input
+	protected DataInputStream cachedInput;
+	
+	// Handle errors
+	protected Logger logger;
+
+	// Scheduled action on the next packet event
+	protected Runnable scheduledAction;
+
+	// Whether or not to update the current player on the first Packet1Login
+	boolean updateOnLogin;
+	Player updatedPlayer;
+	
+	public PlayerInjector(Logger logger, Player player, ListenerInvoker invoker) throws IllegalAccessException {
+		this.logger = logger;
+		this.player = player;
+		this.invoker = invoker;
+	}
+
+	/**
+	 * Retrieve the notch (NMS) entity player object.
+	 * @param player - the player to retrieve.
+	 * @return Notch player object.
+	 */
+	protected EntityPlayer getEntityPlayer(Player player) {
+		CraftPlayer craft = (CraftPlayer) player;
+		return craft.getHandle();
+	}
+	
+	/**
+	 * Initialize all fields for this player injector, if it hasn't already.
+	 * @throws IllegalAccessException An error has occured.
+	 */
+	public void initialize(Object injectionSource) throws IllegalAccessException {
+		if (injectionSource == null)
+			throw new IllegalArgumentException("injectionSource cannot be NULL");
+		
+		//Dispatch to the correct injection method
+		if (injectionSource instanceof Player)
+			initializePlayer(injectionSource);
+		else if (injectionSource instanceof NetLoginHandler)
+			initializeLogin(injectionSource);
+		else 
+			throw new IllegalArgumentException("Cannot initialize a player hook using a " + injectionSource.getClass().getName());
+	}
+	
+	/**
+	 * Initialize the player injector using an actual player instance.
+	 * @param player - the player to hook.
+	 */
+	public void initializePlayer(Object player) {
+		
+		EntityPlayer notchEntity = getEntityPlayer((Player) player);
+		
+		if (!hasInitialized) {
+			// Do this first, in case we encounter an exception
+			hasInitialized = true;
+			
+			// Retrieve the server handler
+			if (serverHandlerField == null) {
+				serverHandlerField = FuzzyReflection.fromObject(notchEntity).getFieldByType(".*NetServerHandler");
+				proxyServerField = getProxyField(notchEntity, serverHandlerField);
+			}
+			
+			// Yo dawg
+			serverHandlerRef = new VolatileField(serverHandlerField, notchEntity);
+			serverHandler = serverHandlerRef.getValue();
+
+			// Next, get the network manager 
+			if (networkManagerField == null) 
+				networkManagerField = FuzzyReflection.fromObject(serverHandler).getFieldByType(".*NetworkManager");
+			initializeNetworkManager(networkManagerField, serverHandler);
+		}
+	}
+	
+	/**
+	 * Initialize the player injector for a NetLoginHandler instead.
+	 * @param netLoginHandler - the net login handler to inject.
+	 */
+	public void initializeLogin(Object netLoginHandler) {
+		if (!hasInitialized) {
+			hasInitialized = true;
+			loginHandler = netLoginHandler;
+			
+			if (netLoginNetworkField == null)
+				netLoginNetworkField =  FuzzyReflection.fromObject(netLoginHandler).getFieldByType(".*NetworkManager");
+			initializeNetworkManager(netLoginNetworkField, netLoginHandler);
+		}
+	}
+	
+	private void initializeNetworkManager(Field reference, Object container) {
+		networkManagerRef = new VolatileField(reference, container);
+		networkManager = networkManagerRef.getValue();
+		
+		// No, don't do it
+		if (networkManager instanceof Factory) {
+			return;
+		}
+		
+		// Create the network manager modifier from the actual object type
+		if (networkManager != null && networkModifier == null)
+			networkModifier = new StructureModifier<Object>(networkManager.getClass(), null, false);
+		
+		// And the queue method
+		if (queueMethod == null)
+			queueMethod = FuzzyReflection.fromClass(reference.getType()).
+							getMethodByParameters("queue", Packet.class );
+		
+		// And the data input stream that we'll use to identify a player
+		if (inputField == null)
+			inputField = FuzzyReflection.fromObject(networkManager, true).
+							getFieldByType("java\\.io\\.DataInputStream");
+	}
+	
+	/**
+	 * Retrieve whether or not the server handler is a proxy object.
+	 * @return TRUE if it is, FALSE otherwise.
+	 */
+	protected boolean hasProxyServerHandler() {
+		return hasProxyType;
+	}
+	
+	/**
+	 * Retrieve the current network manager.
+	 * @return Current network manager.
+	 */
+	public Object getNetworkManager() {
+		return networkManagerRef.getValue();
+	}
+	
+	/**
+	 * Set the current network manager.
+	 * @param value - new network manager.
+	 * @param force - whether or not to save this value.
+	 */
+	public void setNetworkManager(Object value, boolean force) {
+		networkManagerRef.setValue(value);
+		
+		if (force)
+			networkManagerRef.saveValue();
+		initializeNetworkManager(networkManagerField, serverHandler);
+	}
+	
+	/**
+	 * Retrieve the associated socket of this player.
+	 * @return The associated socket.
+	 * @throws IllegalAccessException If we're unable to read the socket field.
+	 */
+	public Socket getSocket() throws IllegalAccessException {
+		try {
+			if (socketField == null)
+				socketField = FuzzyReflection.fromObject(networkManager).getFieldListByType(Socket.class).get(0);
+			if (socket == null)
+				socket = (Socket) FieldUtils.readField(socketField, networkManager);
+			return socket;
+			
+		} catch (IndexOutOfBoundsException e) {
+			throw new IllegalAccessException("Unable to read the socket field.");
+		}
+	}
+	
+	/**
+	 * Attempt to disconnect the current client.
+	 * @param message - the message to display.
+	 * @throws InvocationTargetException If disconnection failed.
+	 */
+	public void disconnect(String message) throws InvocationTargetException {
+		// Get a non-null handler
+		boolean usingNetServer = serverHandler != null;
+		
+		Object handler = usingNetServer ? serverHandler : loginHandler;
+		Method disconnect = usingNetServer ? serverDisconnect : loginDisconnect;
+		
+		// Execute disconnect on it
+		if (handler != null) {
+			if (disconnect == null) {
+				disconnect = FuzzyReflection.fromObject(handler).getMethodByName("disconnect.*");
+				
+				// Save the method for later
+				if (usingNetServer)
+					serverDisconnect = disconnect;
+				else
+					loginDisconnect = disconnect;
+			}
+			
+			try {
+				disconnect.invoke(handler, message);
+				return;
+			} catch (IllegalArgumentException e) {
+				logger.log(Level.WARNING, "Invalid argument passed to disconnect method: " + message, e);
+			} catch (IllegalAccessException e) {
+				logger.log(Level.SEVERE, "Unable to access disconnect method.", e);
+			}
+		}
+			
+		// Fuck it
+		try {
+			getSocket().close();
+		} catch (IOException e) {
+			logger.log(Level.SEVERE, "Unable to close socket.", e);
+		} catch (IllegalAccessException e) {
+			logger.log(Level.SEVERE, "Insufficient permissions. Cannot close socket.", e);
+		}
+	}
+	
+	private Field getProxyField(EntityPlayer notchEntity, Field serverField) {
+
+		try {
+			Object handler = FieldUtils.readField(serverHandlerField, notchEntity, true);
+			
+			// Is this a Minecraft hook?
+			if (handler != null && !handler.getClass().getName().startsWith("net.minecraft.server")) {
+				
+				// This is our proxy object
+				if (handler instanceof Factory)
+					return null;
+				
+				hasProxyType = true;
+				logger.log(Level.WARNING, "Detected server handler proxy type by another plugin. Conflict may occur!");
+				
+				// No? Is it a Proxy type?
+				try {
+					FuzzyReflection reflection = FuzzyReflection.fromObject(handler, true);
+					
+					// It might be
+					return reflection.getFieldByType(".*NetServerHandler");
+					
+				} catch (RuntimeException e) {
+					// Damn
+				}
+			}
+			
+		} catch (IllegalAccessException e) {
+			logger.warning("Unable to load server handler from proxy type.");
+		}
+
+		// Nope, just go with it
+		return null;
+	}
+	
+	/**
+	 * Retrieves the current net handler for this player.
+	 * @return Current net handler.
+	 * @throws IllegalAccessException Unable to find or retrieve net handler.
+	 */
+	protected Object getNetHandler() throws IllegalAccessException {
+		
+		// What a mess
+		try {
+			if (netHandlerField == null)
+				netHandlerField = FuzzyReflection.fromClass(networkManager.getClass(), true).
+									getFieldByType("net\\.minecraft\\.NetHandler");
+		} catch (RuntimeException e1) {
+			// Swallow it
+		}
+		
+		// Second attempt
+		if (netHandlerField == null) {
+			try {
+				// Well, that sucks. Try just Minecraft objects then.
+				netHandlerField = FuzzyReflection.fromClass(networkManager.getClass(), true).
+									 getFieldByType(FuzzyReflection.MINECRAFT_OBJECT);
+				
+			} catch (RuntimeException e2) {
+				throw new IllegalAccessException("Cannot locate net handler. " + e2.getMessage());
+			}
+		}
+		
+		// Get the handler
+		if (netHandler == null)
+			netHandler = FieldUtils.readField(netHandlerField, networkManager, true);
+		return netHandler;
+	}
+	
+	/**
+	 * Retrieve the stored entity player from a given NetHandler.
+	 * @param netHandler - the nethandler to retrieve it from.
+	 * @return The stored entity player.
+	 * @throws IllegalAccessException If the reflection failed.
+	 */
+	private EntityPlayer getEntityPlayer(Object netHandler) throws IllegalAccessException {
+		if (entityPlayerField == null)
+			entityPlayerField = FuzzyReflection.fromObject(netHandler).getFieldByType(".*EntityPlayer");
+		return (EntityPlayer) FieldUtils.readField(entityPlayerField, netHandler);
+	}
+	
+	/**
+	 * Processes the given packet as if it was transmitted by the current player.
+	 * @param packet - packet to process.
+	 * @throws IllegalAccessException If the reflection machinery failed.
+	 * @throws InvocationTargetException If the underlying method caused an error.
+	 */
+	public void processPacket(Packet packet) throws IllegalAccessException, InvocationTargetException {
+		
+		Object netHandler = getNetHandler();
+		
+		// Get the process method
+		if (processMethod == null) {
+			try {
+				processMethod = FuzzyReflection.fromClass(Packet.class).
+						getMethodByParameters("processPacket", netHandlerField.getType());
+			} catch (RuntimeException e) {
+				throw new IllegalArgumentException("Cannot locate process packet method: " + e.getMessage());
+			}
+		}
+	
+		// We're ready
+		try {
+			processMethod.invoke(packet, netHandler);
+		} catch (IllegalArgumentException e) {
+			throw new IllegalArgumentException("Method " + processMethod.getName() + " is not compatible.");
+		} catch (InvocationTargetException e) {
+			throw e;
+		}
+	}
+	
+	/**
+	 * Send a packet to the client.
+	 * @param packet - server packet to send.
+	 * @param filtered - whether or not the packet will be filtered by our listeners.
+	 * @param InvocationTargetException If an error occured when sending the packet.
+	 */
+	public abstract void sendServerPacket(Packet packet, boolean filtered) throws InvocationTargetException;
+	
+	/**
+	 * Inject a hook to catch packets sent to the current player.
+	 */
+	public abstract void injectManager();
+	
+	/**
+	 * Remove all hooks and modifications.
+	 */
+	public abstract void cleanupAll();
+	
+	/**
+	 * Determine if this inject method can even be attempted.
+	 * @return TRUE if can be attempted, though possibly with failure, FALSE otherwise.
+	 */
+	public abstract boolean canInject(GamePhase state);
+	
+	/**
+	 * Retrieve the hook type this class represents.
+	 * @return Hook type this class represents.
+	 */
+	public abstract PlayerInjectHooks getHookType();
+	
+	/**
+	 * Invoked before a new listener is registered.
+	 * <p>
+	 * The player injector should throw an exception if this listener cannot be properly supplied with packet events. 
+	 * @param listener - the listener that is about to be registered.
+	 */
+	public abstract void checkListener(PacketListener listener);
+	
+	/**
+	 * Allows a packet to be sent by the listeners.
+	 * @param packet - packet to sent.
+	 * @return The given packet, or the packet replaced by the listeners.
+	 */
+	public Packet handlePacketSending(Packet packet) {
+		// Get the packet ID too
+		Integer id = invoker.getPacketID(packet);
+		Player currentPlayer = player;
+		
+		// Hack #1: Handle a single scheduled action
+		if (scheduledAction != null) {
+			scheduledAction.run();
+			scheduledAction = null;
+		}
+		// Hack #2
+		if (updateOnLogin) {
+			if (id == Packets.Server.LOGIN) {
+				try {
+					updatedPlayer = getEntityPlayer(getNetHandler()).getBukkitEntity();
+				} catch (IllegalAccessException e) {
+					logger.log(Level.WARNING, "Cannot update player in PlayerEvent.", e);
+				}
+			}
+			
+			// This will only occur in the NetLoginHandler injection
+			if (updatedPlayer != null)
+				currentPlayer = updatedPlayer;
+		}
+		
+		// Make sure we're listening
+		if (id != null && hasListener(id)) {
+			// A packet has been sent guys!
+			PacketContainer container = new PacketContainer(id, packet);
+			PacketEvent event = PacketEvent.fromServer(invoker, container, currentPlayer);
+			invoker.invokePacketSending(event);
+			
+			// Cancelling is pretty simple. Just ignore the packet.
+			if (event.isCancelled())
+				return null;
+			
+			// Right, remember to replace the packet again
+			return event.getPacket().getHandle();
+		}
+		
+		return packet;
+	}
+	
+	/**
+	 * Determine if the given injector is listening for this packet ID.
+	 * @param packetID - packet ID to check.
+	 * @return TRUE if it is, FALSE oterhwise.
+	 */
+	protected abstract boolean hasListener(int packetID);
+	
+	/**
+	 * Retrieve the current player's input stream.
+	 * @param cache - whether or not to cache the result of this method.
+	 * @return The player's input stream.
+	 */
+	public DataInputStream getInputStream(boolean cache) {
+		if (inputField == null)
+			throw new IllegalStateException("Input field is NULL.");
+		if (networkManager == null)
+				throw new IllegalStateException("Network manager is NULL.");
+		
+		// Get the associated input stream
+		try {
+			if (cache && cachedInput != null)
+				return cachedInput;
+			
+			// Save to cache
+			cachedInput = (DataInputStream) FieldUtils.readField(inputField, networkManager, true);
+			return cachedInput;
+			
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Unable to read input stream.", e);
+		}
+	}
+	
+	/**
+	 * Schedule an action to occur on the next sent packet.
+	 * @param action - action to execute.
+	 */
+	public void scheduleAction(Runnable action) {
+		scheduledAction = action;
+	}
+
+	/**
+	 * Retrieve the hooked player.
+	 */
+	public Player getPlayer() {
+		return player;
+	}
+	
+	/**
+	 * Retrieve the hooked player object OR the more up-to-date player instance.
+	 * @return The hooked player, or a more up-to-date instance.
+	 */
+	public Player getUpdatedPlayer() {
+		if (updatedPlayer != null)
+			return updatedPlayer;
+		else
+			return player;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/ReplacedArrayList.java

@@ -0,0 +1,342 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.injector.player;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+import com.google.common.base.Objects;
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+
+/**
+ * Represents an array list that wraps another list, while automatically replacing one element with another.
+ * <p>
+ * The replaced elements can be recovered. 
+ * 
+ * @author Kristian
+ * @param <TKey> - type of the elements we're replacing.
+ */
+class ReplacedArrayList<TKey> extends ArrayList<TKey> {
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = 1008492765999744804L;
+	
+	private BiMap<TKey, TKey> replaceMap = HashBiMap.create();
+	private List<TKey> underlyingList;
+	
+	public ReplacedArrayList(List<TKey> underlyingList) {
+		this.underlyingList = underlyingList;
+	}
+	
+	/**
+	 * Invoked when a element inserted is replaced.
+	 * @param inserting - the element inserted.
+	 * @param replacement - the element that it should replace.
+	 */
+	protected void onReplacing(TKey inserting, TKey replacement) {
+		// Default is to do nothing.
+	}
+	
+	/**
+	 * Invoked when an element is being inserted.
+	 * <p>
+	 * This should be used to add a "replace" map.
+	 * @param inserting - the element to insert.
+	 */
+	protected void onInserting(TKey inserting) {
+		// Default is again nothing
+	}
+	
+	/**
+	 * Invoksed when an element is being removed.
+	 * @param removing - the element being removed.
+	 */
+	protected void onRemoved(TKey removing) {
+		// Do nothing
+	}
+	
+	@Override
+	public boolean add(TKey element) {
+		onInserting(element);
+		
+		if (replaceMap.containsKey(element)) {
+			TKey replacement = replaceMap.get(element);
+			onReplacing(element, replacement);
+			return delegate().add(replacement);
+		} else {
+			return delegate().add(element);
+		}
+	}
+	
+	@Override
+	public void add(int index, TKey element) {
+		onInserting(element);
+		
+		if (replaceMap.containsKey(element)) {
+			TKey replacement = replaceMap.get(element);
+			onReplacing(element, replacement);
+			delegate().add(index, replacement);
+		} else {
+			delegate().add(index, element);
+		}
+	}
+	
+	@Override
+	public boolean addAll(Collection<? extends TKey> collection) {
+		int oldSize = size();
+		
+		for (TKey element : collection)
+			add(element);
+		return size() != oldSize;
+	}
+	
+	@Override
+	public boolean addAll(int index, Collection<? extends TKey> elements) {
+		int oldSize = size();
+		
+		for (TKey element : elements)
+			add(index++, element);
+		return size() != oldSize;
+	}
+
+	@SuppressWarnings("unchecked")
+	@Override
+	public boolean remove(Object object) {
+		boolean success = delegate().remove(object);
+	
+		if (success)
+			onRemoved((TKey) object);
+		return success;
+	}
+	
+	@Override
+	public TKey remove(int index) {
+		TKey removed = delegate().remove(index);
+		
+		if (removed != null)
+			onRemoved(removed);
+		return removed;
+	}
+	
+	@Override
+	public boolean removeAll(Collection<?> collection) {
+		int oldSize = size();
+		
+		// Use the remove method
+		for (Object element : collection)
+			remove(element);
+		return size() != oldSize;
+	}
+	
+	protected List<TKey> delegate() {
+		return underlyingList;
+	}
+
+	@Override
+	public void clear() {
+		for (TKey element : delegate())
+			onRemoved(element);
+		
+		delegate().clear();
+	}
+
+	@Override
+	public boolean contains(Object o) {
+		return delegate().contains(o);
+	}
+
+	@Override
+	public boolean containsAll(Collection<?> c) {
+		return delegate().containsAll(c);
+	}
+
+	@Override
+	public TKey get(int index) {
+		return delegate().get(index);
+	}
+
+	@Override
+	public int indexOf(Object o) {
+		return delegate().indexOf(o);
+	}
+
+	@Override
+	public boolean isEmpty() {
+		return delegate().isEmpty();
+	}
+
+	@Override
+	public Iterator<TKey> iterator() {
+		return delegate().iterator();
+	}
+
+	@Override
+	public int lastIndexOf(Object o) {
+		return delegate().lastIndexOf(o);
+	}
+
+	@Override
+	public ListIterator<TKey> listIterator() {
+		return delegate().listIterator();
+	}
+
+	@Override
+	public ListIterator<TKey> listIterator(int index) {
+		return delegate().listIterator(index);
+	}
+
+	@Override
+	public boolean retainAll(Collection<?> c) {
+		int oldSize = size();
+		
+		for (Iterator<TKey> it = delegate().iterator(); it.hasNext(); ) {
+			TKey current = it.next();
+			
+			// Remove elements that are not in the list
+			if (!c.contains(current)) {
+				it.remove();
+				onRemoved(current);
+			}
+		}
+		return size() != oldSize;
+	}
+
+	@Override
+	public TKey set(int index, TKey element) {
+		// Make sure to replace the element
+		if (replaceMap.containsKey(element)) {
+			TKey replacement = replaceMap.get(element);
+			onReplacing(element, replacement);
+			return delegate().set(index, replacement);
+		} else {
+			return delegate().set(index, element);
+		}
+	}
+
+	@Override
+	public int size() {
+		return delegate().size();
+	}
+
+	@Override
+	public List<TKey> subList(int fromIndex, int toIndex) {
+		return delegate().subList(fromIndex, toIndex);
+	}
+
+	@Override
+	public Object[] toArray() {
+		return delegate().toArray();
+	}
+
+	@Override
+	public <T> T[] toArray(T[] a) {
+		return delegate().toArray(a);
+	}
+	
+	/**
+	 * Add a replace rule.
+	 * <p>
+	 * This automatically replaces every existing element.
+	 * @param target - instance to find.
+	 * @param replacement - instance to replace with.
+	 */
+	public synchronized void addMapping(TKey target, TKey replacement) {
+		addMapping(target, replacement, false);
+	}
+	
+	/**
+	 * Add a replace rule.
+	 * <p>
+	 * This automatically replaces every existing element.
+	 * @param target - instance to find.
+	 * @param replacement - instance to replace with.
+	 * @param ignoreExisting - whether or not to ignore the existing elements.
+	 */
+	public synchronized void addMapping(TKey target, TKey replacement, boolean ignoreExisting) {
+		replaceMap.put(target, replacement);
+
+		// Replace existing elements
+		if (!ignoreExisting) {
+			replaceAll(target, replacement);
+		}
+	}
+	
+	/**
+	 * Revert the given mapping.
+	 * @param target - the instance we replaced.
+	 */
+	public synchronized void removeMapping(TKey target) {
+		// Make sure the mapping exist
+		if (replaceMap.containsKey(target)) {
+			TKey replacement = replaceMap.get(target);
+			replaceMap.remove(target);
+	
+			// Revert existing elements
+			replaceAll(replacement, target);
+		}
+	}
+	
+	/**
+	 * Replace all instances of the given object.
+	 * @param find - object to find.
+	 * @param replace - object to replace it with.
+	 */
+	public synchronized void replaceAll(TKey find, TKey replace) {
+		for (int i = 0; i < underlyingList.size(); i++) {
+			if (Objects.equal(underlyingList.get(i), find)) {
+				onReplacing(find, replace);
+				underlyingList.set(i, replace);
+			}
+		}
+	}
+	
+	/**
+	 * Undo all replacements.
+	 */
+	public synchronized void revertAll() {
+		
+		// No need to do anything else
+		if (replaceMap.size() < 1)
+			return;
+		
+		BiMap<TKey, TKey> inverse = replaceMap.inverse();
+		
+		for (int i = 0; i < underlyingList.size(); i++) {
+			TKey replaced = underlyingList.get(i);
+			
+			if (inverse.containsKey(replaced)) {
+				TKey original = inverse.get(replaced);
+				onReplacing(replaced, original);
+				underlyingList.set(i, original);
+			}
+		}
+		
+		replaceMap.clear();
+	}
+	
+	@Override
+	protected void finalize() throws Throwable {
+		revertAll();
+		super.finalize();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/TemporaryPlayerFactory.java

@@ -0,0 +1,152 @@
+package com.comphenix.protocol.injector.player;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+import net.sf.cglib.proxy.Callback;
+import net.sf.cglib.proxy.CallbackFilter;
+import net.sf.cglib.proxy.Enhancer;
+import net.sf.cglib.proxy.MethodInterceptor;
+import net.sf.cglib.proxy.MethodProxy;
+import net.sf.cglib.proxy.NoOp;
+
+import org.bukkit.Server;
+import org.bukkit.entity.Player;
+
+import com.comphenix.protocol.injector.PacketConstructor;
+import com.comphenix.protocol.reflect.FieldAccessException;
+
+/**
+ * Create fake player instances that represents pre-authenticated clients.
+ */
+class TemporaryPlayerFactory {
+	
+	/**
+	 * Able to store a PlayerInjector.
+	 * <p>
+	 * A necessary hack.
+	 * @author Kristian
+	 */
+	public static class InjectContainer {
+		private PlayerInjector injector;
+
+		public PlayerInjector getInjector() {
+			return injector;
+		}
+
+		public void setInjector(PlayerInjector injector) {
+			this.injector = injector;
+		}
+	}
+	
+	// Helpful constructors
+	private final PacketConstructor chatPacket;
+	
+	public TemporaryPlayerFactory() {
+		chatPacket =  PacketConstructor.DEFAULT.withPacket(3, new Object[] { "DEMO" });
+	}
+	
+	/**
+	 * Construct a temporary player that supports a subset of every player command.
+	 * <p>
+	 * Supported methods include:
+	 * <ul>
+	 *   <li>getPlayer()</li>
+	 *   <li>getAddress()</li>
+	 *   <li>getServer()</li>
+	 *   <li>chat(String)</li>
+	 *   <li>sendMessage(String)</li>
+	 *   <li>sendMessage(String[])</li>
+	 *   <li>kickPlayer(String)</li>
+	 * </ul>
+	 * <p>
+	 * Note that the player a player has not been assigned a name yet, and thus cannot be
+	 * uniquely identified. Use the 
+	 * @param injector - the player injector used.
+	 * @param server - the current server.
+	 * @return A temporary player instance.
+	 */
+	public Player createTemporaryPlayer(final Server server) {
+	
+		// Default implementation
+		Callback implementation = new MethodInterceptor() {
+			@Override
+			public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
+
+				String methodName = method.getName();
+				PlayerInjector injector = ((InjectContainer) obj).getInjector();
+				
+				// Use the socket to get the address
+				if (methodName.equalsIgnoreCase("getName"))
+					return "UNKNOWN[" + injector.getSocket().getRemoteSocketAddress() + "]";
+				if (methodName.equalsIgnoreCase("getPlayer"))
+					return injector.getUpdatedPlayer();
+				if (methodName.equalsIgnoreCase("getAddress")) 
+					return injector.getSocket().getRemoteSocketAddress();
+				if (methodName.equalsIgnoreCase("getServer"))
+					return server;
+				
+				try {
+					// Handle send message methods
+					if (methodName.equalsIgnoreCase("chat") || methodName.equalsIgnoreCase("sendMessage")) {
+						Object argument = args[0];
+						
+						// Dynamic overloading
+						if (argument instanceof String) {
+							return sendMessage(injector, (String) argument);
+						} else if (argument instanceof String[]) {
+							for (String message : (String[]) argument) {
+								sendMessage(injector, message);
+							}
+							return null;
+						}
+					}
+				} catch (InvocationTargetException e) {
+					throw e.getCause();
+				}
+				
+				// Also, handle kicking
+				if (methodName.equalsIgnoreCase("kickPlayer")) {
+					injector.disconnect((String) args[0]);
+					return null;
+				}
+					
+				// Ignore all other methods
+				throw new UnsupportedOperationException(
+						"The method " + method.getName() + " is not supported for temporary players.");
+			}
+    	};
+		
+		// CGLib is amazing
+    	Enhancer ex = new Enhancer();
+    	ex.setSuperclass(InjectContainer.class);
+    	ex.setInterfaces(new Class[] { Player.class });
+		ex.setCallbacks(new Callback[] { NoOp.INSTANCE, implementation });
+		ex.setCallbackFilter(new CallbackFilter() {
+			@Override
+			public int accept(Method method) {
+				// Do not override the object method or the superclass methods
+				if (method.getDeclaringClass().equals(Object.class) ||
+					method.getDeclaringClass().equals(InjectContainer.class))
+					return 0;
+				else 
+					return 1;
+			}
+		});
+    	
+    	return (Player) ex.create();
+	}
+	
+	/**
+	 * Send a message to the given client.
+	 * @param injector - the injector representing the client.
+	 * @param message - a message.
+	 * @return Always NULL.
+	 * @throws InvocationTargetException If the message couldn't be sent.
+	 * @throws FieldAccessException If we were unable to construct the message packet.
+	 */
+	private Object sendMessage(PlayerInjector injector, String message) throws InvocationTargetException, FieldAccessException {
+		injector.sendServerPacket(chatPacket.createPacket(message).getHandle(), false);
+		return null;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/metrics/Metrics.java

@@ -0,0 +1,648 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.metrics;
+
+/*
+ * Copyright 2011 Tyler Blair. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice, this list of
+ *       conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright notice, this list
+ *       of conditions and the following disclaimer in the documentation and/or other materials
+ *       provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and contributors and should not be interpreted as representing official policies,
+ * either expressed or implied, of anybody else.
+ */
+
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.plugin.PluginDescriptionFile;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.UnsupportedEncodingException;
+import java.net.Proxy;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLEncoder;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.UUID;
+import java.util.logging.Level;
+
+/**
+ * <p>
+ * The metrics class obtains data about a plugin and submits statistics about it to the metrics backend.
+ * </p>
+ * <p>
+ * Public methods provided by this class:
+ * </p>
+ * <code>
+ * Graph createGraph(String name); <br/>
+ * void addCustomData(Metrics.Plotter plotter); <br/>
+ * void start(); <br/>
+ * </code>
+ */
+class Metrics {
+
+    /**
+     * The current revision number
+     */
+    private final static int REVISION = 5;
+
+    /**
+     * The base url of the metrics domain
+     */
+    private static final String BASE_URL = "http://mcstats.org";
+
+    /**
+     * The url used to report a server's status
+     */
+    private static final String REPORT_URL = "/report/%s";
+
+    /**
+     * The separator to use for custom data. This MUST NOT change unless you are hosting your own
+     * version of metrics and want to change it.
+     */
+    private static final String CUSTOM_DATA_SEPARATOR = "~~";
+
+    /**
+     * Interval of time to ping (in minutes)
+     */
+    private static final int PING_INTERVAL = 10;
+
+    /**
+     * The plugin this metrics submits for
+     */
+    private final Plugin plugin;
+
+    /**
+     * All of the custom graphs to submit to metrics
+     */
+    private final Set<Graph> graphs = Collections.synchronizedSet(new HashSet<Graph>());
+
+    /**
+     * The default graph, used for addCustomData when you don't want a specific graph
+     */
+    private final Graph defaultGraph = new Graph("Default");
+
+    /**
+     * The plugin configuration file
+     */
+    private final YamlConfiguration configuration;
+    
+    /**
+     * The plugin configuration file
+     */
+    private final File configurationFile;
+
+    /**
+     * Unique server id
+     */
+    private final String guid;
+
+    /**
+     * Lock for synchronization
+     */
+    private final Object optOutLock = new Object();
+
+    /**
+     * Id of the scheduled task
+     */
+    private volatile int taskId = -1;
+
+    public Metrics(final Plugin plugin) throws IOException {
+        if (plugin == null) {
+            throw new IllegalArgumentException("Plugin cannot be null");
+        }
+
+        this.plugin = plugin;
+
+        // load the config
+        configurationFile = getConfigFile();
+        configuration = YamlConfiguration.loadConfiguration(configurationFile);
+
+        // add some defaults
+        configuration.addDefault("opt-out", false);
+        configuration.addDefault("guid", UUID.randomUUID().toString());
+
+        // Do we need to create the file?
+        if (configuration.get("guid", null) == null) {
+            configuration.options().header("http://mcstats.org").copyDefaults(true);
+            configuration.save(configurationFile);
+        }
+
+        // Load the guid then
+        guid = configuration.getString("guid");
+    }
+
+    /**
+     * Construct and create a Graph that can be used to separate specific plotters to their own graphs
+     * on the metrics website. Plotters can be added to the graph object returned.
+     *
+     * @param name The name of the graph
+     * @return Graph object created. Will never return NULL under normal circumstances unless bad parameters are given
+     */
+    public Graph createGraph(final String name) {
+        if (name == null) {
+            throw new IllegalArgumentException("Graph name cannot be null");
+        }
+
+        // Construct the graph object
+        final Graph graph = new Graph(name);
+
+        // Now we can add our graph
+        graphs.add(graph);
+
+        // and return back
+        return graph;
+    }
+
+    /**
+     * Add a Graph object to Metrics that represents data for the plugin that should be sent to the backend
+     *
+     * @param graph The name of the graph
+     */
+    public void addGraph(final Graph graph) {
+        if (graph == null) {
+            throw new IllegalArgumentException("Graph cannot be null");
+        }
+
+        graphs.add(graph);
+    }
+
+    /**
+     * Adds a custom data plotter to the default graph
+     *
+     * @param plotter The plotter to use to plot custom data
+     */
+    public void addCustomData(final Plotter plotter) {
+        if (plotter == null) {
+            throw new IllegalArgumentException("Plotter cannot be null");
+        }
+
+        // Add the plotter to the graph o/
+        defaultGraph.addPlotter(plotter);
+
+        // Ensure the default graph is included in the submitted graphs
+        graphs.add(defaultGraph);
+    }
+
+    /**
+     * Start measuring statistics. This will immediately create an async repeating task as the plugin and send
+     * the initial data to the metrics backend, and then after that it will post in increments of
+     * PING_INTERVAL * 1200 ticks.
+     *
+     * @return True if statistics measuring is running, otherwise false.
+     */
+    public boolean start() {
+        synchronized (optOutLock) {
+            // Did we opt out?
+            if (isOptOut()) {
+                return false;
+            }
+
+            // Is metrics already running?
+            if (taskId >= 0) {
+                return true;
+            }
+
+            // Begin hitting the server with glorious data
+            taskId = plugin.getServer().getScheduler().scheduleAsyncRepeatingTask(plugin, new Runnable() {
+
+                private boolean firstPost = true;
+
+                public void run() {
+                    try {
+                        // This has to be synchronized or it can collide with the disable method.
+                        synchronized (optOutLock) {
+                            // Disable Task, if it is running and the server owner decided to opt-out
+                            if (isOptOut() && taskId > 0) {
+                                plugin.getServer().getScheduler().cancelTask(taskId);
+                                taskId = -1;
+                                // Tell all plotters to stop gathering information.
+                                for (Graph graph : graphs){
+                                    graph.onOptOut();
+                                }
+                            }
+                        }
+
+                        // We use the inverse of firstPost because if it is the first time we are posting,
+                        // it is not a interval ping, so it evaluates to FALSE
+                        // Each time thereafter it will evaluate to TRUE, i.e PING!
+                        postPlugin(!firstPost);
+
+                        // After the first post we set firstPost to false
+                        // Each post thereafter will be a ping
+                        firstPost = false;
+                    } catch (IOException e) {
+                        Bukkit.getLogger().log(Level.INFO, "[Metrics] " + e.getMessage());
+                    }
+                }
+            }, 0, PING_INTERVAL * 1200);
+
+            return true;
+        }
+    }
+
+    /**
+     * Has the server owner denied plugin metrics?
+     *
+     * @return true if metrics should be opted out of it
+     */
+    public boolean isOptOut() {
+        synchronized(optOutLock) {
+            try {
+                // Reload the metrics file
+                configuration.load(getConfigFile());
+            } catch (IOException ex) {
+                Bukkit.getLogger().log(Level.INFO, "[Metrics] " + ex.getMessage());
+                return true;
+            } catch (InvalidConfigurationException ex) {
+                Bukkit.getLogger().log(Level.INFO, "[Metrics] " + ex.getMessage());
+                return true;
+            }
+            return configuration.getBoolean("opt-out", false);
+        }
+    }
+
+    /**
+    * Enables metrics for the server by setting "opt-out" to false in the config file and starting the metrics task.
+    *
+    * @throws IOException
+    */
+    public void enable() throws IOException {
+        // This has to be synchronized or it can collide with the check in the task.
+        synchronized (optOutLock) {
+        	// Check if the server owner has already set opt-out, if not, set it.
+        	if (isOptOut()) {
+        		configuration.set("opt-out", false);
+        		configuration.save(configurationFile);
+        	}
+
+        	// Enable Task, if it is not running
+        	if (taskId < 0) {
+        		start();
+        	}
+        }
+    }
+
+    /**
+     * Disables metrics for the server by setting "opt-out" to true in the config file and canceling the metrics task.
+     *
+     * @throws IOException
+     */
+    public void disable() throws IOException {
+        // This has to be synchronized or it can collide with the check in the task.
+        synchronized (optOutLock) {
+            // Check if the server owner has already set opt-out, if not, set it.
+            if (!isOptOut()) {
+                configuration.set("opt-out", true);
+                configuration.save(configurationFile);
+            }
+
+            // Disable Task, if it is running
+            if (taskId > 0) {
+                this.plugin.getServer().getScheduler().cancelTask(taskId);
+                taskId = -1;
+            }
+        }
+    }
+
+    /**
+     * Gets the File object of the config file that should be used to store data such as the GUID and opt-out status
+     *
+     * @return the File object for the config file
+     */
+    public File getConfigFile() {
+        // I believe the easiest way to get the base folder (e.g craftbukkit set via -P) for plugins to use
+        // is to abuse the plugin object we already have
+        // plugin.getDataFolder() => base/plugins/PluginA/
+        // pluginsFolder => base/plugins/
+        // The base is not necessarily relative to the startup directory.
+        File pluginsFolder = plugin.getDataFolder().getParentFile();
+
+        // return => base/plugins/PluginMetrics/config.yml
+        return new File(new File(pluginsFolder, "PluginMetrics"), "config.yml");
+    }
+
+    /**
+     * Generic method that posts a plugin to the metrics website
+     */
+    private void postPlugin(final boolean isPing) throws IOException {
+        // The plugin's description file containg all of the plugin data such as name, version, author, etc
+        final PluginDescriptionFile description = plugin.getDescription();
+
+        // Construct the post data
+        final StringBuilder data = new StringBuilder();
+        data.append(encode("guid")).append('=').append(encode(guid));
+        encodeDataPair(data, "version", description.getVersion());
+        encodeDataPair(data, "server", Bukkit.getVersion());
+        encodeDataPair(data, "players", Integer.toString(Bukkit.getServer().getOnlinePlayers().length));
+        encodeDataPair(data, "revision", String.valueOf(REVISION));
+
+        // If we're pinging, append it
+        if (isPing) {
+            encodeDataPair(data, "ping", "true");
+        }
+
+        // Acquire a lock on the graphs, which lets us make the assumption we also lock everything
+        // inside of the graph (e.g plotters)
+        synchronized (graphs) {
+            final Iterator<Graph> iter = graphs.iterator();
+
+            while (iter.hasNext()) {
+                final Graph graph = iter.next();
+
+                for (Plotter plotter : graph.getPlotters()) {
+                    // The key name to send to the metrics server
+                    // The format is C-GRAPHNAME-PLOTTERNAME where separator - is defined at the top
+                    // Legacy (R4) submitters use the format Custom%s, or CustomPLOTTERNAME
+                    final String key = String.format("C%s%s%s%s", CUSTOM_DATA_SEPARATOR, graph.getName(), CUSTOM_DATA_SEPARATOR, plotter.getColumnName());
+
+                    // The value to send, which for the foreseeable future is just the string
+                    // value of plotter.getValue()
+                    final String value = Integer.toString(plotter.getValue());
+
+                    // Add it to the http post data :)
+                    encodeDataPair(data, key, value);
+                }
+            }
+        }
+
+        // Create the url
+        URL url = new URL(BASE_URL + String.format(REPORT_URL, encode(plugin.getDescription().getName())));
+
+        // Connect to the website
+        URLConnection connection;
+
+        // Mineshafter creates a socks proxy, so we can safely bypass it
+        // It does not reroute POST requests so we need to go around it
+        if (isMineshafterPresent()) {
+            connection = url.openConnection(Proxy.NO_PROXY);
+        } else {
+            connection = url.openConnection();
+        }
+
+        connection.setDoOutput(true);
+
+        // Write the data
+        final OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
+        writer.write(data.toString());
+        writer.flush();
+
+        // Now read the response
+        final BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
+        final String response = reader.readLine();
+
+        // close resources
+        writer.close();
+        reader.close();
+
+        if (response == null || response.startsWith("ERR")) {
+            throw new IOException(response); //Throw the exception
+        } else {
+            // Is this the first update this hour?
+            if (response.contains("OK This is your first update this hour")) {
+                synchronized (graphs) {
+                    final Iterator<Graph> iter = graphs.iterator();
+
+                    while (iter.hasNext()) {
+                        final Graph graph = iter.next();
+
+                        for (Plotter plotter : graph.getPlotters()) {
+                            plotter.reset();
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     * Check if mineshafter is present. If it is, we need to bypass it to send POST requests
+     *
+     * @return true if mineshafter is installed on the server
+     */
+    private boolean isMineshafterPresent() {
+        try {
+            Class.forName("mineshafter.MineServer");
+            return true;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    /**
+     * <p>Encode a key/value data pair to be used in a HTTP post request. This INCLUDES a & so the first
+     * key/value pair MUST be included manually, e.g:</p>
+     * <code>
+     * StringBuffer data = new StringBuffer();
+     * data.append(encode("guid")).append('=').append(encode(guid));
+     * encodeDataPair(data, "version", description.getVersion());
+     * </code>
+     *
+     * @param buffer the stringbuilder to append the data pair onto
+     * @param key the key value
+     * @param value the value
+     */
+    private static void encodeDataPair(final StringBuilder buffer, final String key, final String value) throws UnsupportedEncodingException {
+        buffer.append('&').append(encode(key)).append('=').append(encode(value));
+    }
+
+    /**
+     * Encode text as UTF-8
+     *
+     * @param text the text to encode
+     * @return the encoded text, as UTF-8
+     */
+    private static String encode(final String text) throws UnsupportedEncodingException {
+        return URLEncoder.encode(text, "UTF-8");
+    }
+
+    /**
+     * Represents a custom graph on the website
+     */
+    public static class Graph {
+
+        /**
+         * The graph's name, alphanumeric and spaces only :)
+         * If it does not comply to the above when submitted, it is rejected
+         */
+        private final String name;
+
+        /**
+         * The set of plotters that are contained within this graph
+         */
+        private final Set<Plotter> plotters = new LinkedHashSet<Plotter>();
+
+        private Graph(final String name) {
+            this.name = name;
+        }
+
+        /**
+         * Gets the graph's name
+         *
+         * @return the Graph's name
+         */
+        public String getName() {
+            return name;
+        }
+
+        /**
+         * Add a plotter to the graph, which will be used to plot entries
+         *
+         * @param plotter the plotter to add to the graph
+         */
+        public void addPlotter(final Plotter plotter) {
+            plotters.add(plotter);
+        }
+
+        /**
+         * Remove a plotter from the graph
+         *
+         * @param plotter the plotter to remove from the graph
+         */
+        public void removePlotter(final Plotter plotter) {
+            plotters.remove(plotter);
+        }
+
+        /**
+         * Gets an <b>unmodifiable</b> set of the plotter objects in the graph
+         *
+         * @return an unmodifiable {@link Set} of the plotter objects
+         */
+        public Set<Plotter> getPlotters() {
+            return Collections.unmodifiableSet(plotters);
+        }
+
+        @Override
+        public int hashCode() {
+            return name.hashCode();
+        }
+
+        @Override
+        public boolean equals(final Object object) {
+            if (!(object instanceof Graph)) {
+                return false;
+            }
+
+            final Graph graph = (Graph) object;
+            return graph.name.equals(name);
+        }
+
+        /**
+         * Called when the server owner decides to opt-out of Metrics while the server is running.
+         */
+        protected void onOptOut() {
+        }
+
+    }
+
+    /**
+     * Interface used to collect custom data for a plugin
+     */
+    public static abstract class Plotter {
+
+        /**
+         * The plot's name
+         */
+        private final String name;
+
+        /**
+         * Construct a plotter with the default plot name
+         */
+        public Plotter() {
+            this("Default");
+        }
+
+        /**
+         * Construct a plotter with a specific plot name
+         *
+         * @param name the name of the plotter to use, which will show up on the website
+         */
+        public Plotter(final String name) {
+            this.name = name;
+        }
+
+        /**
+         * Get the current value for the plotted point. Since this function defers to an external function
+         * it may or may not return immediately thus cannot be guaranteed to be thread friendly or safe.
+         * This function can be called from any thread so care should be taken when accessing resources
+         * that need to be synchronized.
+         *
+         * @return the current value for the point to be plotted.
+         */
+        public abstract int getValue();
+
+        /**
+         * Get the column name for the plotted point
+         *
+         * @return the plotted point's column name
+         */
+        public String getColumnName() {
+            return name;
+        }
+
+        /**
+         * Called after the website graphs have been updated
+         */
+        public void reset() {
+        }
+
+        @Override
+        public int hashCode() {
+            return getColumnName().hashCode();
+        }
+
+        @Override
+        public boolean equals(final Object object) {
+            if (!(object instanceof Plotter)) {
+                return false;
+            }
+
+            final Plotter plotter = (Plotter) object;
+            return plotter.name.equals(name) && plotter.getValue() == getValue();
+        }
+
+    }
+}

ProtocolLib/src/main/java/com/comphenix/protocol/metrics/Statistics.java

@@ -0,0 +1,81 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.metrics;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketListener;
+import com.comphenix.protocol.metrics.Metrics.Graph;
+
+public class Statistics {
+
+	// Metrics
+	private Metrics metrics;
+	
+	public Statistics(Plugin plugin) throws IOException {
+		metrics = new Metrics(plugin);
+		metrics.start();
+		
+		// Determine who is using this library
+		addPluginUserGraph(metrics);
+	}
+	
+	private void addPluginUserGraph(Metrics metrics) {
+	
+		Graph pluginUsers = metrics.createGraph("Plugin Users");
+		
+		for (Map.Entry<String, Integer> entry : getPluginUsers(ProtocolLibrary.getProtocolManager()).entrySet()) {
+			final int count = entry.getValue();
+			
+			// Plot plugins of this type
+			pluginUsers.addPlotter(new Metrics.Plotter(entry.getKey()) {
+				@Override
+				public int getValue() {
+					return count;
+				}
+			});
+		}
+	}
+	
+	// Retrieve loaded plugins
+	private Map<String, Integer> getPluginUsers(ProtocolManager manager) {
+		
+		Map<String, Integer> users = new HashMap<String, Integer>();
+			
+		for (PacketListener listener : manager.getPacketListeners()) {
+			
+			String name = PacketAdapter.getPluginName(listener);
+			
+			// Increment occurence
+			if (!users.containsKey(name)) {
+				users.put(name, 1);
+			} else {
+				users.put(name, users.get(name) + 1);
+			}
+		}
+		
+		return users;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/EquivalentConverter.java

@@ -0,0 +1,31 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+/**
+ * Interface that converts generic objects into types and back.
+ * 
+ * @author Kristian
+ * @param <TType> The specific type.
+ */
+public interface EquivalentConverter<TType> {
+	public TType getSpecific(Object generic);
+	public Object getGeneric(TType specific);
+	public Class<TType> getSpecificType();
+}
+

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/FieldAccessException.java

@@ -0,0 +1,51 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+/**
+ * Invoked when a field is inaccessible due to security limitations, or when it simply doesn't exist.
+ * 
+ * @author Kristian
+ */
+public class FieldAccessException extends Exception {
+
+	/**
+	 * Generated by Eclipse.
+	 */
+	private static final long serialVersionUID = 1911011681494034617L;
+
+	public FieldAccessException() {
+		super();
+	}
+	
+	public FieldAccessException(String message, Throwable cause) {
+		super(message, cause);
+	}
+
+	public FieldAccessException(String message) {
+		super(message);
+	}
+
+	public FieldAccessException(Throwable cause) {
+		super(cause);
+	}
+	
+	public static FieldAccessException fromFormat(String message, Object... params) {
+		return new FieldAccessException(String.format(message, params));
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/FieldUtils.java

@@ -1,473 +1,511 @@
-package com.comphenix.protocol.reflect;
-
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import java.lang.reflect.AccessibleObject;
-import java.lang.reflect.Field;
-import java.lang.reflect.Member;
-import java.lang.reflect.Modifier;
-import java.util.Iterator;
-
-import org.apache.commons.lang.ClassUtils;
-
-/**
- * Utilities for working with fields by reflection. Adapted and refactored from
- * the dormant [reflect] Commons sandbox component.
- * <p>
- * The ability is provided to break the scoping restrictions coded by the
- * programmer. This can allow fields to be changed that shouldn't be. This
- * facility should be used with care.
- * 
- * @author Apache Software Foundation
- * @author Matt Benson
- * @since 2.5
- * @version $Id: FieldUtils.java 1057009 2011-01-09 19:48:06Z niallp $
- */
-@SuppressWarnings("rawtypes")
-public class FieldUtils {
-
-	/**
-	 * FieldUtils instances should NOT be constructed in standard programming.
-	 * <p>
-	 * This constructor is public to permit tools that require a JavaBean
-	 * instance to operate.
-	 */
-	public FieldUtils() {
-		super();
-	}
-
-	/**
-	 * Gets an accessible <code>Field</code> by name respecting scope.
-	 * Superclasses/interfaces will be considered.
-	 * 
-	 * @param cls the class to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @return the Field object
-	 * @throws IllegalArgumentException if the class or field name is null
-	 */
-	public static Field getField(Class cls, String fieldName) {
-		Field field = getField(cls, fieldName, false);
-		MemberUtils.setAccessibleWorkaround(field);
-		return field;
-	}
-
-	/**
-	 * Gets an accessible <code>Field</code> by name breaking scope if
-	 * requested. Superclasses/interfaces will be considered.
-	 * 
-	 * @param cls the class to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @return the Field object
-	 * @throws IllegalArgumentException if the class or field name is null
-	 */
-	public static Field getField(final Class cls, String fieldName, boolean forceAccess) {
-		if (cls == null) {
-			throw new IllegalArgumentException("The class must not be null");
-		}
-		if (fieldName == null) {
-			throw new IllegalArgumentException("The field name must not be null");
-		}
-		// Sun Java 1.3 has a bugged implementation of getField hence we write
-		// the
-		// code ourselves
-
-		// getField() will return the Field object with the declaring class
-		// set correctly to the class that declares the field. Thus requesting
-		// the
-		// field on a subclass will return the field from the superclass.
-		//
-		// priority order for lookup:
-		// searchclass private/protected/package/public
-		// superclass protected/package/public
-		// private/different package blocks access to further superclasses
-		// implementedinterface public
-
-		// check up the superclass hierarchy
-		for (Class acls = cls; acls != null; acls = acls.getSuperclass()) {
-			try {
-				Field field = acls.getDeclaredField(fieldName);
-				// getDeclaredField checks for non-public scopes as well
-				// and it returns accurate results
-				if (!Modifier.isPublic(field.getModifiers())) {
-					if (forceAccess) {
-						field.setAccessible(true);
-					} else {
-						continue;
-					}
-				}
-				return field;
-			} catch (NoSuchFieldException ex) {
-				// ignore
-			}
-		}
-		// check the public interface case. This must be manually searched for
-		// incase there is a public supersuperclass field hidden by a
-		// private/package
-		// superclass field.
-		Field match = null;
-		for (Iterator intf = ClassUtils.getAllInterfaces(cls).iterator(); intf.hasNext();) {
-			try {
-				Field test = ((Class) intf.next()).getField(fieldName);
-				if (match != null) {
-					throw new IllegalArgumentException("Reference to field " + fieldName
-							+ " is ambiguous relative to " + cls
-							+ "; a matching field exists on two or more implemented interfaces.");
-				}
-				match = test;
-			} catch (NoSuchFieldException ex) {
-				// ignore
-			}
-		}
-		return match;
-	}
-
-	/**
-	 * Read an accessible static Field.
-	 * 
-	 * @param field to read
-	 * @return the field value
-	 * @throws IllegalArgumentException if the field is null or not static
-	 * @throws IllegalAccessException if the field is not accessible
-	 */
-	public static Object readStaticField(Field field) throws IllegalAccessException {
-		return readStaticField(field, false);
-	}
-
-	/**
-	 * Read a static Field.
-	 * 
-	 * @param field to read
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method.
-	 * @return the field value
-	 * @throws IllegalArgumentException if the field is null or not static
-	 * @throws IllegalAccessException if the field is not made accessible
-	 */
-	public static Object readStaticField(Field field, boolean forceAccess)
-			throws IllegalAccessException {
-		if (field == null) {
-			throw new IllegalArgumentException("The field must not be null");
-		}
-		if (!Modifier.isStatic(field.getModifiers())) {
-			throw new IllegalArgumentException("The field '" + field.getName() + "' is not static");
-		}
-		return readField(field, (Object) null, forceAccess);
-	}
-
-	/**
-	 * Read the named public static field. Superclasses will be considered.
-	 * 
-	 * @param cls the class to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @return the value of the field
-	 * @throws IllegalArgumentException if the class or field name is null
-	 * @throws IllegalAccessException if the field is not accessible
-	 */
-	public static Object readStaticField(Class cls, String fieldName) throws IllegalAccessException {
-		return readStaticField(cls, fieldName, false);
-	}
-
-	/**
-	 * Read the named static field. Superclasses will be considered.
-	 * 
-	 * @param cls the class to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @return the Field object
-	 * @throws IllegalArgumentException if the class or field name is null
-	 * @throws IllegalAccessException if the field is not made accessible
-	 */
-	public static Object readStaticField(Class cls, String fieldName, boolean forceAccess)
-			throws IllegalAccessException {
-		Field field = getField(cls, fieldName, forceAccess);
-		if (field == null) {
-			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
-		}
-		// already forced access above, don't repeat it here:
-		return readStaticField(field, false);
-	}
-
-	/**
-	 * Read an accessible Field.
-	 * 
-	 * @param field the field to use
-	 * @param target the object to call on, may be null for static fields
-	 * @return the field value
-	 * @throws IllegalArgumentException if the field is null
-	 * @throws IllegalAccessException if the field is not accessible
-	 */
-	public static Object readField(Field field, Object target) throws IllegalAccessException {
-		return readField(field, target, false);
-	}
-
-	/**
-	 * Read a Field.
-	 * 
-	 * @param field the field to use
-	 * @param target the object to call on, may be null for static fields
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method.
-	 * @return the field value
-	 * @throws IllegalArgumentException if the field is null
-	 * @throws IllegalAccessException if the field is not made accessible
-	 */
-	public static Object readField(Field field, Object target, boolean forceAccess) throws IllegalAccessException {
-		if (field == null) 
-			throw new IllegalArgumentException("The field must not be null");
-		
-		if (forceAccess && !field.isAccessible()) {
-			field.setAccessible(true);
-		} else {
-			MemberUtils.setAccessibleWorkaround(field);
-		}
-		return field.get(target);
-	}
-
-	/**
-	 * Read the named public field. Superclasses will be considered.
-	 * 
-	 * @param target the object to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @return the value of the field
-	 * @throws IllegalArgumentException if the class or field name is null
-	 * @throws IllegalAccessException if the named field is not public
-	 */
-	public static Object readField(Object target, String fieldName) throws IllegalAccessException {
-		return readField(target, fieldName, false);
-	}
-
-	/**
-	 * Read the named field. Superclasses will be considered.
-	 * 
-	 * @param target the object to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @return the field value
-	 * @throws IllegalArgumentException if the class or field name is null
-	 * @throws IllegalAccessException if the named field is not made accessible
-	 */
-	public static Object readField(Object target, String fieldName, boolean forceAccess)
-			throws IllegalAccessException {
-		if (target == null) {
-			throw new IllegalArgumentException("target object must not be null");
-		}
-		Class cls = target.getClass();
-		Field field = getField(cls, fieldName, forceAccess);
-		if (field == null) {
-			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
-		}
-		// already forced access above, don't repeat it here:
-		return readField(field, target);
-	}
-
-	/**
-	 * Write a public static Field.
-	 * 
-	 * @param field to write
-	 * @param value to set
-	 * @throws IllegalArgumentException if the field is null or not static
-	 * @throws IllegalAccessException if the field is not public or is final
-	 */
-	public static void writeStaticField(Field field, Object value) throws IllegalAccessException {
-		writeStaticField(field, value, false);
-	}
-
-	/**
-	 * Write a static Field.
-	 * 
-	 * @param field to write
-	 * @param value to set
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @throws IllegalArgumentException if the field is null or not static
-	 * @throws IllegalAccessException if the field is not made accessible or is
-	 *             final
-	 */
-	public static void writeStaticField(Field field, Object value, boolean forceAccess)
-			throws IllegalAccessException {
-		if (field == null) {
-			throw new IllegalArgumentException("The field must not be null");
-		}
-		if (!Modifier.isStatic(field.getModifiers())) {
-			throw new IllegalArgumentException("The field '" + field.getName() + "' is not static");
-		}
-		writeField(field, (Object) null, value, forceAccess);
-	}
-
-	/**
-	 * Write a named public static Field. Superclasses will be considered.
-	 * 
-	 * @param cls Class on which the Field is to be found
-	 * @param fieldName to write
-	 * @param value to set
-	 * @throws IllegalArgumentException if the field cannot be located or is not
-	 *             static
-	 * @throws IllegalAccessException if the field is not public or is final
-	 */
-	public static void writeStaticField(Class cls, String fieldName, Object value)
-			throws IllegalAccessException {
-		writeStaticField(cls, fieldName, value, false);
-	}
-
-	/**
-	 * Write a named static Field. Superclasses will be considered.
-	 * 
-	 * @param cls Class on which the Field is to be found
-	 * @param fieldName to write
-	 * @param value to set
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @throws IllegalArgumentException if the field cannot be located or is not
-	 *             static
-	 * @throws IllegalAccessException if the field is not made accessible or is
-	 *             final
-	 */
-	public static void writeStaticField(Class cls, String fieldName, Object value,
-			boolean forceAccess) throws IllegalAccessException {
-		Field field = getField(cls, fieldName, forceAccess);
-		if (field == null) {
-			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
-		}
-		// already forced access above, don't repeat it here:
-		writeStaticField(field, value);
-	}
-
-	/**
-	 * Write an accessible field.
-	 * 
-	 * @param field to write
-	 * @param target the object to call on, may be null for static fields
-	 * @param value to set
-	 * @throws IllegalArgumentException if the field is null
-	 * @throws IllegalAccessException if the field is not accessible or is final
-	 */
-	public static void writeField(Field field, Object target, Object value)
-			throws IllegalAccessException {
-		writeField(field, target, value, false);
-	}
-
-	/**
-	 * Write a field.
-	 * 
-	 * @param field to write
-	 * @param target the object to call on, may be null for static fields
-	 * @param value to set
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @throws IllegalArgumentException if the field is null
-	 * @throws IllegalAccessException if the field is not made accessible or is
-	 *             final
-	 */
-	public static void writeField(Field field, Object target, Object value, boolean forceAccess)
-			throws IllegalAccessException {
-		if (field == null) {
-			throw new IllegalArgumentException("The field must not be null");
-		}
-		if (forceAccess && !field.isAccessible()) {
-			field.setAccessible(true);
-		} else {
-			MemberUtils.setAccessibleWorkaround(field);
-		}
-		field.set(target, value);
-	}
-
-	/**
-	 * Write a public field. Superclasses will be considered.
-	 * 
-	 * @param target the object to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @param value to set
-	 * @throws IllegalArgumentException if <code>target</code> or
-	 *             <code>fieldName</code> is null
-	 * @throws IllegalAccessException if the field is not accessible
-	 */
-	public static void writeField(Object target, String fieldName, Object value)
-			throws IllegalAccessException {
-		writeField(target, fieldName, value, false);
-	}
-
-	/**
-	 * Write a field. Superclasses will be considered.
-	 * 
-	 * @param target the object to reflect, must not be null
-	 * @param fieldName the field name to obtain
-	 * @param value to set
-	 * @param forceAccess whether to break scope restrictions using the
-	 *            <code>setAccessible</code> method. <code>False</code> will
-	 *            only match public fields.
-	 * @throws IllegalArgumentException if <code>target</code> or
-	 *             <code>fieldName</code> is null
-	 * @throws IllegalAccessException if the field is not made accessible
-	 */
-	public static void writeField(Object target, String fieldName, Object value, boolean forceAccess)
-			throws IllegalAccessException {
-		if (target == null) {
-			throw new IllegalArgumentException("target object must not be null");
-		}
-		Class cls = target.getClass();
-		Field field = getField(cls, fieldName, forceAccess);
-		if (field == null) {
-			throw new IllegalArgumentException("Cannot locate declared field " + cls.getName()
-					+ "." + fieldName);
-		}
-		// already forced access above, don't repeat it here:
-		writeField(field, target, value);
-	}
-
-	// Useful member methods
-	private static class MemberUtils {
-
-		private static final int ACCESS_TEST = Modifier.PUBLIC | Modifier.PROTECTED
-				| Modifier.PRIVATE;
-
-		public static void setAccessibleWorkaround(AccessibleObject o) {
-			if (o == null || o.isAccessible()) {
-				return;
-			}
-			Member m = (Member) o;
-			if (Modifier.isPublic(m.getModifiers())
-					&& isPackageAccess(m.getDeclaringClass().getModifiers())) {
-				try {
-					o.setAccessible(true);
-				} catch (SecurityException e) { // NOPMD
-					// ignore in favor of subsequent IllegalAccessException
-				}
-			}
-		}
-
-		/**
-		 * Returns whether a given set of modifiers implies package access.
-		 * 
-		 * @param modifiers to test
-		 * @return true unless package/protected/private modifier detected
-		 */
-		public static boolean isPackageAccess(int modifiers) {
-			return (modifiers & ACCESS_TEST) == 0;
-		}
-	}
-}
+package com.comphenix.protocol.reflect;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.reflect.AccessibleObject;
+import java.lang.reflect.Field;
+import java.lang.reflect.Member;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * Utilities for working with fields by reflection. Adapted and refactored from
+ * the dormant [reflect] Commons sandbox component.
+ * <p>
+ * The ability is provided to break the scoping restrictions coded by the
+ * programmer. This can allow fields to be changed that shouldn't be. This
+ * facility should be used with care.
+ * 
+ * @author Apache Software Foundation
+ * @author Matt Benson
+ * @since 2.5
+ * @version $Id: FieldUtils.java 1057009 2011-01-09 19:48:06Z niallp $
+ */
+@SuppressWarnings("rawtypes")
+public class FieldUtils {
+
+	/**
+	 * FieldUtils instances should NOT be constructed in standard programming.
+	 * <p>
+	 * This constructor is public to permit tools that require a JavaBean
+	 * instance to operate.
+	 */
+	public FieldUtils() {
+		super();
+	}
+
+	/**
+	 * Gets an accessible <code>Field</code> by name respecting scope.
+	 * Superclasses/interfaces will be considered.
+	 * 
+	 * @param cls the class to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @return the Field object
+	 * @throws IllegalArgumentException if the class or field name is null
+	 */
+	public static Field getField(Class cls, String fieldName) {
+		Field field = getField(cls, fieldName, false);
+		MemberUtils.setAccessibleWorkaround(field);
+		return field;
+	}
+
+	/**
+	 * Gets an accessible <code>Field</code> by name breaking scope if
+	 * requested. Superclasses/interfaces will be considered.
+	 * 
+	 * @param cls the class to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @return the Field object
+	 * @throws IllegalArgumentException if the class or field name is null
+	 */
+	public static Field getField(final Class cls, String fieldName, boolean forceAccess) {
+		if (cls == null) {
+			throw new IllegalArgumentException("The class must not be null");
+		}
+		if (fieldName == null) {
+			throw new IllegalArgumentException("The field name must not be null");
+		}
+		// Sun Java 1.3 has a bugged implementation of getField hence we write
+		// the
+		// code ourselves
+
+		// getField() will return the Field object with the declaring class
+		// set correctly to the class that declares the field. Thus requesting
+		// the
+		// field on a subclass will return the field from the superclass.
+		//
+		// priority order for lookup:
+		// searchclass private/protected/package/public
+		// superclass protected/package/public
+		// private/different package blocks access to further superclasses
+		// implementedinterface public
+
+		// check up the superclass hierarchy
+		for (Class acls = cls; acls != null; acls = acls.getSuperclass()) {
+			try {
+				Field field = acls.getDeclaredField(fieldName);
+				// getDeclaredField checks for non-public scopes as well
+				// and it returns accurate results
+				if (!Modifier.isPublic(field.getModifiers())) {
+					if (forceAccess) {
+						field.setAccessible(true);
+					} else {
+						continue;
+					}
+				}
+				return field;
+			} catch (NoSuchFieldException ex) {
+				// ignore
+			}
+		}
+		// check the public interface case. This must be manually searched for
+		// in case there is a public supersuperclass field hidden by a
+		// private/package
+		// superclass field.
+		Field match = null;
+		for (Iterator intf = getAllInterfaces(cls).iterator(); intf.hasNext();) {
+			try {
+				Field test = ((Class) intf.next()).getField(fieldName);
+				if (match != null) {
+					throw new IllegalArgumentException("Reference to field " + fieldName
+							+ " is ambiguous relative to " + cls
+							+ "; a matching field exists on two or more implemented interfaces.");
+				}
+				match = test;
+			} catch (NoSuchFieldException ex) {
+				// ignore
+			}
+		}
+		return match;
+	}
+	
+    /**
+     * <p>Gets a <code>List</code> of all interfaces implemented by the given
+     * class and its superclasses.</p>
+     *
+     * <p>The order is determined by looking through each interface in turn as
+     * declared in the source file and following its hierarchy up. Then each
+     * superclass is considered in the same way. Later duplicates are ignored,
+     * so the order is maintained.</p>
+     *
+     * @param cls  the class to look up, may be <code>null</code>
+     * @return the <code>List</code> of interfaces in order,
+     *  <code>null</code> if null input
+     */
+    private static List getAllInterfaces(Class cls) {
+        if (cls == null) {
+            return null;
+        }
+        List<Class> list = new ArrayList<Class>();
+        
+        while (cls != null) {
+            Class[] interfaces = cls.getInterfaces();
+            for (int i = 0; i < interfaces.length; i++) {
+                if (list.contains(interfaces[i]) == false) {
+                    list.add(interfaces[i]);
+                }
+                List superInterfaces = getAllInterfaces(interfaces[i]);
+                for (Iterator it = superInterfaces.iterator(); it.hasNext();) {
+                    Class intface = (Class) it.next();
+                    if (list.contains(intface) == false) {
+                        list.add(intface);
+                    }
+                }
+            }
+            cls = cls.getSuperclass();
+        }
+        return list;
+    }
+
+	/**
+	 * Read an accessible static Field.
+	 * 
+	 * @param field to read
+	 * @return the field value
+	 * @throws IllegalArgumentException if the field is null or not static
+	 * @throws IllegalAccessException if the field is not accessible
+	 */
+	public static Object readStaticField(Field field) throws IllegalAccessException {
+		return readStaticField(field, false);
+	}
+
+	/**
+	 * Read a static Field.
+	 * 
+	 * @param field to read
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method.
+	 * @return the field value
+	 * @throws IllegalArgumentException if the field is null or not static
+	 * @throws IllegalAccessException if the field is not made accessible
+	 */
+	public static Object readStaticField(Field field, boolean forceAccess)
+			throws IllegalAccessException {
+		if (field == null) {
+			throw new IllegalArgumentException("The field must not be null");
+		}
+		if (!Modifier.isStatic(field.getModifiers())) {
+			throw new IllegalArgumentException("The field '" + field.getName() + "' is not static");
+		}
+		return readField(field, (Object) null, forceAccess);
+	}
+
+	/**
+	 * Read the named public static field. Superclasses will be considered.
+	 * 
+	 * @param cls the class to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @return the value of the field
+	 * @throws IllegalArgumentException if the class or field name is null
+	 * @throws IllegalAccessException if the field is not accessible
+	 */
+	public static Object readStaticField(Class cls, String fieldName) throws IllegalAccessException {
+		return readStaticField(cls, fieldName, false);
+	}
+
+	/**
+	 * Read the named static field. Superclasses will be considered.
+	 * 
+	 * @param cls the class to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @return the Field object
+	 * @throws IllegalArgumentException if the class or field name is null
+	 * @throws IllegalAccessException if the field is not made accessible
+	 */
+	public static Object readStaticField(Class cls, String fieldName, boolean forceAccess)
+			throws IllegalAccessException {
+		Field field = getField(cls, fieldName, forceAccess);
+		if (field == null) {
+			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
+		}
+		// already forced access above, don't repeat it here:
+		return readStaticField(field, false);
+	}
+
+	/**
+	 * Read an accessible Field.
+	 * 
+	 * @param field the field to use
+	 * @param target the object to call on, may be null for static fields
+	 * @return the field value
+	 * @throws IllegalArgumentException if the field is null
+	 * @throws IllegalAccessException if the field is not accessible
+	 */
+	public static Object readField(Field field, Object target) throws IllegalAccessException {
+		return readField(field, target, false);
+	}
+
+	/**
+	 * Read a Field.
+	 * 
+	 * @param field the field to use
+	 * @param target the object to call on, may be null for static fields
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method.
+	 * @return the field value
+	 * @throws IllegalArgumentException if the field is null
+	 * @throws IllegalAccessException if the field is not made accessible
+	 */
+	public static Object readField(Field field, Object target, boolean forceAccess) throws IllegalAccessException {
+		if (field == null) 
+			throw new IllegalArgumentException("The field must not be null");
+		
+		if (forceAccess && !field.isAccessible()) {
+			field.setAccessible(true);
+		} else {
+			MemberUtils.setAccessibleWorkaround(field);
+		}
+		return field.get(target);
+	}
+
+	/**
+	 * Read the named public field. Superclasses will be considered.
+	 * 
+	 * @param target the object to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @return the value of the field
+	 * @throws IllegalArgumentException if the class or field name is null
+	 * @throws IllegalAccessException if the named field is not public
+	 */
+	public static Object readField(Object target, String fieldName) throws IllegalAccessException {
+		return readField(target, fieldName, false);
+	}
+
+	/**
+	 * Read the named field. Superclasses will be considered.
+	 * 
+	 * @param target the object to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @return the field value
+	 * @throws IllegalArgumentException if the class or field name is null
+	 * @throws IllegalAccessException if the named field is not made accessible
+	 */
+	public static Object readField(Object target, String fieldName, boolean forceAccess)
+			throws IllegalAccessException {
+		if (target == null) {
+			throw new IllegalArgumentException("target object must not be null");
+		}
+		Class cls = target.getClass();
+		Field field = getField(cls, fieldName, forceAccess);
+		if (field == null) {
+			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
+		}
+		// already forced access above, don't repeat it here:
+		return readField(field, target);
+	}
+
+	/**
+	 * Write a public static Field.
+	 * 
+	 * @param field to write
+	 * @param value to set
+	 * @throws IllegalArgumentException if the field is null or not static
+	 * @throws IllegalAccessException if the field is not public or is final
+	 */
+	public static void writeStaticField(Field field, Object value) throws IllegalAccessException {
+		writeStaticField(field, value, false);
+	}
+
+	/**
+	 * Write a static Field.
+	 * 
+	 * @param field to write
+	 * @param value to set
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @throws IllegalArgumentException if the field is null or not static
+	 * @throws IllegalAccessException if the field is not made accessible or is
+	 *             final
+	 */
+	public static void writeStaticField(Field field, Object value, boolean forceAccess)
+			throws IllegalAccessException {
+		if (field == null) {
+			throw new IllegalArgumentException("The field must not be null");
+		}
+		if (!Modifier.isStatic(field.getModifiers())) {
+			throw new IllegalArgumentException("The field '" + field.getName() + "' is not static");
+		}
+		writeField(field, (Object) null, value, forceAccess);
+	}
+
+	/**
+	 * Write a named public static Field. Superclasses will be considered.
+	 * 
+	 * @param cls Class on which the Field is to be found
+	 * @param fieldName to write
+	 * @param value to set
+	 * @throws IllegalArgumentException if the field cannot be located or is not
+	 *             static
+	 * @throws IllegalAccessException if the field is not public or is final
+	 */
+	public static void writeStaticField(Class cls, String fieldName, Object value)
+			throws IllegalAccessException {
+		writeStaticField(cls, fieldName, value, false);
+	}
+
+	/**
+	 * Write a named static Field. Superclasses will be considered.
+	 * 
+	 * @param cls Class on which the Field is to be found
+	 * @param fieldName to write
+	 * @param value to set
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @throws IllegalArgumentException if the field cannot be located or is not
+	 *             static
+	 * @throws IllegalAccessException if the field is not made accessible or is
+	 *             final
+	 */
+	public static void writeStaticField(Class cls, String fieldName, Object value,
+			boolean forceAccess) throws IllegalAccessException {
+		Field field = getField(cls, fieldName, forceAccess);
+		if (field == null) {
+			throw new IllegalArgumentException("Cannot locate field " + fieldName + " on " + cls);
+		}
+		// already forced access above, don't repeat it here:
+		writeStaticField(field, value);
+	}
+
+	/**
+	 * Write an accessible field.
+	 * 
+	 * @param field to write
+	 * @param target the object to call on, may be null for static fields
+	 * @param value to set
+	 * @throws IllegalArgumentException if the field is null
+	 * @throws IllegalAccessException if the field is not accessible or is final
+	 */
+	public static void writeField(Field field, Object target, Object value)
+			throws IllegalAccessException {
+		writeField(field, target, value, false);
+	}
+
+	/**
+	 * Write a field.
+	 * 
+	 * @param field to write
+	 * @param target the object to call on, may be null for static fields
+	 * @param value to set
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @throws IllegalArgumentException if the field is null
+	 * @throws IllegalAccessException if the field is not made accessible or is
+	 *             final
+	 */
+	public static void writeField(Field field, Object target, Object value, boolean forceAccess)
+			throws IllegalAccessException {
+		if (field == null) {
+			throw new IllegalArgumentException("The field must not be null");
+		}
+		if (forceAccess && !field.isAccessible()) {
+			field.setAccessible(true);
+		} else {
+			MemberUtils.setAccessibleWorkaround(field);
+		}
+		field.set(target, value);
+	}
+
+	/**
+	 * Write a public field. Superclasses will be considered.
+	 * 
+	 * @param target the object to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @param value to set
+	 * @throws IllegalArgumentException if <code>target</code> or
+	 *             <code>fieldName</code> is null
+	 * @throws IllegalAccessException if the field is not accessible
+	 */
+	public static void writeField(Object target, String fieldName, Object value)
+			throws IllegalAccessException {
+		writeField(target, fieldName, value, false);
+	}
+
+	/**
+	 * Write a field. Superclasses will be considered.
+	 * 
+	 * @param target the object to reflect, must not be null
+	 * @param fieldName the field name to obtain
+	 * @param value to set
+	 * @param forceAccess whether to break scope restrictions using the
+	 *            <code>setAccessible</code> method. <code>False</code> will
+	 *            only match public fields.
+	 * @throws IllegalArgumentException if <code>target</code> or
+	 *             <code>fieldName</code> is null
+	 * @throws IllegalAccessException if the field is not made accessible
+	 */
+	public static void writeField(Object target, String fieldName, Object value, boolean forceAccess)
+			throws IllegalAccessException {
+		if (target == null) {
+			throw new IllegalArgumentException("target object must not be null");
+		}
+		Class cls = target.getClass();
+		Field field = getField(cls, fieldName, forceAccess);
+		if (field == null) {
+			throw new IllegalArgumentException("Cannot locate declared field " + cls.getName()
+					+ "." + fieldName);
+		}
+		// already forced access above, don't repeat it here:
+		writeField(field, target, value);
+	}
+
+	// Useful member methods
+	private static class MemberUtils {
+
+		private static final int ACCESS_TEST = Modifier.PUBLIC | Modifier.PROTECTED
+				| Modifier.PRIVATE;
+
+		public static void setAccessibleWorkaround(AccessibleObject o) {
+			if (o == null || o.isAccessible()) {
+				return;
+			}
+			Member m = (Member) o;
+			if (Modifier.isPublic(m.getModifiers())
+					&& isPackageAccess(m.getDeclaringClass().getModifiers())) {
+				try {
+					o.setAccessible(true);
+				} catch (SecurityException e) { // NOPMD
+					// ignore in favor of subsequent IllegalAccessException
+				}
+			}
+		}
+
+		/**
+		 * Returns whether a given set of modifiers implies package access.
+		 * 
+		 * @param modifiers to test
+		 * @return true unless package/protected/private modifier detected
+		 */
+		public static boolean isPackageAccess(int modifiers) {
+			return (modifiers & ACCESS_TEST) == 0;
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/FuzzyReflection.java

@@ -0,0 +1,396 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+/**
+ * Retrieves fields and methods by signature, not just name.
+ * 
+ * @author Kristian
+ */
+public class FuzzyReflection {
+
+	/**
+	 * Matches a Minecraft object.
+	 */
+	public static final String MINECRAFT_OBJECT = "net\\.minecraft(\\.\\w+)+";
+	
+	// The class we're actually representing
+	private Class<?> source;
+
+	// Whether or not to lookup private members
+	private boolean forceAccess;
+
+	public FuzzyReflection(Class<?> source, boolean forceAccess) {
+		this.source = source;
+		this.forceAccess = forceAccess;
+	}
+	
+	/**
+	 * Retrieves a fuzzy reflection instance from a given class.
+	 * @param source - the class we'll use.
+	 * @return A fuzzy reflection instance.
+	 */
+	public static FuzzyReflection fromClass(Class<?> source) {
+		return fromClass(source, false);
+	}
+	
+	/**
+	 * Retrieves a fuzzy reflection instance from a given class.
+	 * @param source - the class we'll use.
+	 * @param forceAccess - whether or not to override scope restrictions.
+	 * @return A fuzzy reflection instance.
+	 */
+	public static FuzzyReflection fromClass(Class<?> source, boolean forceAccess) {
+		return new FuzzyReflection(source, forceAccess);
+	}
+	
+	/**
+	 * Retrieves a fuzzy reflection instance from an object.
+	 * @param reference - the object we'll use.
+	 * @return A fuzzy reflection instance that uses the class of the given object.
+	 */
+	public static FuzzyReflection fromObject(Object reference) {
+		return new FuzzyReflection(reference.getClass(), false);
+	}
+	
+	/**
+	 * Retrieves a fuzzy reflection instance from an object.
+	 * @param reference - the object we'll use.
+	 * @param forceAccess - whether or not to override scope restrictions.
+	 * @return A fuzzy reflection instance that uses the class of the given object.
+	 */
+	public static FuzzyReflection fromObject(Object reference, boolean forceAccess) {
+		return new FuzzyReflection(reference.getClass(), forceAccess);
+	}
+	
+	/**
+	 * Retrieves the underlying class.
+	 */
+	public Class<?> getSource() {
+		return source;
+	}
+	
+	/**
+	 * Retrieves a method by looking at its name.
+	 * @param nameRegex -  regular expression that will match method names.
+	 * @return The first method that satisfies the regular expression.
+	 * @throws IllegalArgumentException If the method cannot be found.
+	 */
+	public Method getMethodByName(String nameRegex) {
+		
+		Pattern match = Pattern.compile(nameRegex);
+		
+		for (Method method : getMethods()) {
+			if (match.matcher(method.getName()).matches()) {
+				// Right - this is probably it. 
+				return method;
+			}
+		}
+
+		throw new IllegalArgumentException("Unable to find a method with the pattern " + 
+									nameRegex + " in " + source.getName());
+	}
+	
+	/**
+	 * Retrieves a method by looking at the parameter types only.
+	 * @param name - potential name of the method. Only used by the error mechanism.
+	 * @param args - parameter types of the method to find.
+	 * @return The first method that satisfies the parameter types.
+	 * @throws IllegalArgumentException If the method cannot be found.
+	 */
+	public Method getMethodByParameters(String name, Class<?>... args) {
+		
+		// Find the correct method to call
+		for (Method method : getMethods()) {
+			if (Arrays.equals(method.getParameterTypes(), args)) {
+				return method;
+			}
+		}
+		
+		// That sucks
+		throw new IllegalArgumentException("Unable to find " + name + " in " + source.getName());
+	}
+	
+	/**
+	 * Retrieves a method by looking at the parameter types and return type only.
+	 * @param name - potential name of the method. Only used by the error mechanism.
+	 * @param returnType - return type of the method to find.
+	 * @param args - parameter types of the method to find.
+	 * @return The first method that satisfies the parameter types.
+	 * @throws IllegalArgumentException If the method cannot be found.
+	 */
+	public Method getMethodByParameters(String name, Class<?> returnType, Class<?>[] args) {
+		// Find the correct method to call
+		List<Method> methods = getMethodListByParameters(returnType, args);
+		
+		if (methods.size() > 0) {
+			return methods.get(0);
+		} else {
+			// That sucks
+			throw new IllegalArgumentException("Unable to find " + name + " in " + source.getName());
+		}
+	}
+	
+	/**
+	 * Retrieves a method by looking at the parameter types and return type only.
+	 * @param name - potential name of the method. Only used by the error mechanism.
+	 * @param returnTypeRegex - regular expression matching the return type of the method to find.
+	 * @param argsRegex - regular expressions of the matching parameter types.
+	 * @return The first method that satisfies the parameter types.
+	 * @throws IllegalArgumentException If the method cannot be found.
+	 */
+	public Method getMethodByParameters(String name, String returnTypeRegex, String[] argsRegex) {
+	
+		Pattern match = Pattern.compile(returnTypeRegex);
+		Pattern[] argMatch = new Pattern[argsRegex.length];
+		
+		for (int i = 0; i < argsRegex.length; i++) {
+			argMatch[i] = Pattern.compile(argsRegex[i]);
+		}
+		
+		// Find the correct method to call
+		for (Method method : getMethods()) {
+			if (match.matcher(method.getReturnType().getName()).matches()) {
+				if (matchParameters(argMatch, method.getParameterTypes()))
+					return method;
+			}
+		}
+		
+		// That sucks
+		throw new IllegalArgumentException("Unable to find " + name + " in " + source.getName());
+	}
+	
+	private boolean matchParameters(Pattern[] parameterMatchers, Class<?>[] argTypes) {
+		if (parameterMatchers.length != argTypes.length)
+			throw new IllegalArgumentException("Arrays must have the same cardinality.");
+		
+		// Check types against the regular expressions
+		for (int i = 0; i < argTypes.length; i++) {
+			if (!parameterMatchers[i].matcher(argTypes[i].getName()).matches())
+				return false;
+		}
+		
+		return true;
+	}
+	
+	/**
+	 * Retrieves every method that has the given parameter types and return type.
+	 * @param returnType - return type of the method to find.
+	 * @param args - parameter types of the method to find.
+	 * @return Every method that satisfies the given constraints.
+	 */
+	public List<Method> getMethodListByParameters(Class<?> returnType, Class<?>[] args) {
+	
+		List<Method> methods = new ArrayList<Method>();
+		
+		// Find the correct method to call
+		for (Method method : getMethods()) {
+			if (method.getReturnType().equals(returnType) && Arrays.equals(method.getParameterTypes(), args)) {
+				methods.add(method);
+			}
+		}
+		
+		return methods;
+	}
+	
+	/**
+	 * Retrieves a field by name.
+	 * @param nameRegex - regular expression that will match a field name.
+	 * @return The first field to match the given expression.
+	 * @throws IllegalArgumentException If the field cannot be found.
+	 */
+	public Field getFieldByName(String nameRegex) {
+		
+		Pattern match = Pattern.compile(nameRegex);
+		
+		for (Field field : getFields()) {
+			if (match.matcher(field.getName()).matches()) {
+				// Right - this is probably it. 
+				return field;
+			}
+		}
+		
+		// Looks like we're outdated. Too bad.
+		throw new IllegalArgumentException("Unable to find a field with the pattern " + 
+									nameRegex + " in " + source.getName());
+	}
+	
+	/**
+	 * Retrieves the first field with a type equal to or more specific to the given type.
+	 * @param name - name the field probably is given. This will only be used in the error message.
+	 * @param type - type of the field to find.
+	 * @return The first field with a type that is an instance of the given type.
+	 */
+	public Field getFieldByType(String name, Class<?> type) {
+		
+		List<Field> fields = getFieldListByType(type);
+		
+		if (fields.size() > 0) {
+			return fields.get(0);
+		} else {
+			// Looks like we're outdated. Too bad.
+			throw new IllegalArgumentException(String.format("Unable to find a field %s with the type %s in %s",
+					name, type.getName(), source.getName())
+			);
+		}
+	}
+	
+	/**
+	 * Retrieves every field with a type equal to or more specific to the given type.
+	 * @param type - type of the fields to find.
+	 * @return Every field with a type that is an instance of the given type.
+	 */
+	public List<Field> getFieldListByType(Class<?> type) {
+		
+		List<Field> fields = new ArrayList<Field>();
+		
+		// Field with a compatible type
+		for (Field field : getFields()) {
+			// A assignable from B -> B instanceOf A
+			if (type.isAssignableFrom(field.getType())) {
+				fields.add(field);
+			}
+		}
+		
+		return fields;
+	}
+	
+	/**
+	 * Retrieves a field by type.
+	 * <p>
+	 * Note that the type is matched using the full canonical representation, i.e.: 
+	 * <ul>
+	 *     <li>java.util.List</li>
+	 *     <li>net.comphenix.xp.ExperienceMod</li>
+	 * </ul>
+	 * @param typeRegex - regular expression that will match the field type.
+	 * @return The first field with a type that matches the given regular expression.
+	 * @throws IllegalArgumentException If the field cannot be found.
+	 */
+	public Field getFieldByType(String typeRegex) {
+		
+		Pattern match = Pattern.compile(typeRegex);
+		
+		// Like above, only here we test the field type
+		for (Field field : getFields()) {
+			String name = field.getType().getName();
+			
+			if (match.matcher(name).matches()) {
+				return field;
+			}
+		}
+		
+		// Looks like we're outdated. Too bad.
+		throw new IllegalArgumentException("Unable to find a field with the type " + 
+										   typeRegex + " in " + source.getName());
+	}
+	
+	/**
+	 * Retrieves a field by type.
+	 * <p>
+	 * Note that the type is matched using the full canonical representation, i.e.: 
+	 * <ul>
+	 *     <li>java.util.List</li>
+	 *     <li>net.comphenix.xp.ExperienceMod</li>
+	 * </ul>
+	 * @param typeRegex - regular expression that will match the field type.
+	 * @param ignored - types to ignore.
+	 * @return The first field with a type that matches the given regular expression.
+	 * @throws IllegalArgumentException If the field cannot be found.
+	 */
+	@SuppressWarnings("rawtypes")
+	public Field getFieldByType(String typeRegex, Set<Class> ignored) {
+		
+		Pattern match = Pattern.compile(typeRegex);
+		
+		// Like above, only here we test the field type
+		for (Field field : getFields()) {
+			Class type = field.getType();
+			
+			if (!ignored.contains(type) && match.matcher(type.getName()).matches()) {
+				return field;
+			}
+		}
+		
+		// Looks like we're outdated. Too bad.
+		throw new IllegalArgumentException("Unable to find a field with the type " + 
+									       typeRegex + " in " + source.getName());
+	}
+	
+	/**
+	 * Retrieves all private and public fields in declared order (after JDK 1.5).
+	 * @return Every field.
+	 */
+	public Set<Field> getFields() {
+		// We will only consider private fields in the declared class
+		if (forceAccess)
+			return setUnion(source.getDeclaredFields(), source.getFields());
+		else
+			return setUnion(source.getFields());
+	}
+	
+	/**
+	 * Retrieves all private and public methods in declared order (after JDK 1.5).
+	 * @return Every method.
+	 */
+	public Set<Method> getMethods() {
+		// We will only consider private methods in the declared class
+		if (forceAccess)
+			return setUnion(source.getDeclaredMethods(), source.getMethods());
+		else
+			return setUnion(source.getMethods());
+	}
+	
+	// Prevent duplicate fields
+	private static <T> Set<T> setUnion(T[]... array) {
+		Set<T> result = new LinkedHashSet<T>();
+		
+		for (T[] elements : array) {
+			for (T element : elements) {
+				result.add(element);
+			}
+		}
+		
+		return result;
+	}
+	
+	/**
+	 * Retrieves whether or not not to override any scope restrictions.
+	 * @return TRUE if we override scope, FALSE otherwise.
+	 */
+	public boolean isForceAccess() {
+		return forceAccess;
+	}
+
+	/**
+	 * Sets whether or not not to override any scope restrictions.
+	 * @param forceAccess - TRUE if we override scope, FALSE otherwise.
+	 */
+	public void setForceAccess(boolean forceAccess) {
+		this.forceAccess = forceAccess;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/IntEnum.java

@@ -0,0 +1,105 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+import java.lang.reflect.Field;
+import java.util.Set;
+
+import com.google.common.collect.BiMap;
+import com.google.common.collect.HashBiMap;
+
+/**
+ * Represents a traditional int field enum.
+ * 
+ * @author Kristian
+ */
+public class IntEnum {
+
+	// Used to convert between IDs and names
+	protected BiMap<Integer, String> members = HashBiMap.create();
+	
+	/**
+	 * Registers every declared integer field.
+	 */
+	public IntEnum() {
+		registerAll();
+	}
+	
+	/**
+	 * Registers every public int field as a member.
+	 */
+	protected void registerAll() {
+		try {
+			// Register every int field
+			for (Field entry : this.getClass().getFields()) {
+				if (entry.getType().equals(int.class)) {
+					registerMember(entry.getInt(this), entry.getName());
+				}
+			}
+		
+		} catch (IllegalArgumentException e) {
+			e.printStackTrace();
+		} catch (IllegalAccessException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	/**
+	 * Registers a member.
+	 * @param id - id of member.
+	 * @param name - name of member.
+	 */
+	protected void registerMember(int id, String name) {
+		members.put(id, name);
+	}
+	
+	/**
+	 * Determines whether or not the given member exists.
+	 * @param id - the ID of the member to find.
+	 * @return TRUE if a member with the given ID exists, FALSE otherwise.
+	 */
+	public boolean hasMember(int id) {
+		return members.containsKey(id);
+	}
+	
+	/**
+	 * Retrieve the ID of the member with the given name.
+	 * @param name - name of member to retrieve.
+	 * @return ID of the member, or NULL if not found.
+	 */
+	public Integer valueOf(String name) {
+		return members.inverse().get(name);
+	}
+	
+	/**
+	 * Retrieve the name of the member with the given id.
+	 * @param id - id of the member to retrieve.
+	 * @return Declared name of the member, or NULL if not found.
+	 */
+	public String getDeclaredName(Integer id) {
+		return members.get(id);
+	}
+	
+	/**
+	 * Retrieve the ID of every registered member.
+	 * @return Enumeration of every value.
+	 */
+	public Set<Integer> values() {
+		return members.keySet();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/ObjectCloner.java

@@ -0,0 +1,87 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+
+/**
+ * Can copy an object field by field.
+ * 
+ * @author Kristian
+ */
+public class ObjectCloner {
+
+	// Cache structure modifiers
+	@SuppressWarnings("rawtypes")
+	private static ConcurrentMap<Class, StructureModifier<Object>> cache =
+			new ConcurrentHashMap<Class, StructureModifier<Object>>();
+	
+	/**
+	 * Copy every field in object A to object B.
+	 * <p>
+	 * The two objects must have the same number of fields of the same type.
+	 * @param source - fields to copy.
+	 * @param destination - fields to copy to.
+	 * @param commonType - type containing each field to copy.
+	 */
+	public static void copyTo(Object source, Object destination, Class<?> commonType) {
+		
+		if (source == null)
+			throw new IllegalArgumentException("Source cannot be NULL");
+		if (destination == null)
+			throw new IllegalArgumentException("Destination cannot be NULL");
+		
+		StructureModifier<Object> modifier = cache.get(commonType);
+
+		// Create the structure modifier if we haven't already
+		if (modifier == null) {
+			StructureModifier<Object> value = new StructureModifier<Object>(commonType, null, false);
+			modifier = cache.putIfAbsent(commonType, value);
+			
+			if (modifier == null)
+				modifier = value;
+		}
+		
+		// Add target
+		StructureModifier<Object> modifierSource = modifier.withTarget(source);
+		StructureModifier<Object> modifierDest = modifier.withTarget(destination);
+		
+		// Copy every field
+		try {
+			for (int i = 0; i < modifierSource.size(); i++) {
+				Object value = modifierSource.read(i);
+				modifierDest.write(i, value);
+				
+				// System.out.println(String.format("Writing value %s to %s", 
+				//		value, modifier.getFields().get(i).getName()));
+			}
+			
+			// Copy private fields underneath
+			Class<?> superclass = commonType.getSuperclass();
+			
+			if (!superclass.equals(Object.class)) {
+				copyTo(source, destination, superclass);
+			}
+			
+		} catch (FieldAccessException e) {
+			throw new RuntimeException("Unable to copy fields from " + commonType.getName(), e);
+		}
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/PrimitiveUtils.java

@@ -0,0 +1,124 @@
+package com.comphenix.protocol.reflect;
+
+/*
+ * Copyright (C) 2008 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.reflect.Type;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Contains static utility methods pertaining to primitive types and their
+ * corresponding wrapper types.
+ * 
+ * @author Kevin Bourrillion
+ */
+public final class PrimitiveUtils {
+	private PrimitiveUtils() {
+	}
+
+	/** A map from primitive types to their corresponding wrapper types. */
+	private static final Map<Class<?>, Class<?>> PRIMITIVE_TO_WRAPPER_TYPE;
+
+	/** A map from wrapper types to their corresponding primitive types. */
+	private static final Map<Class<?>, Class<?>> WRAPPER_TO_PRIMITIVE_TYPE;
+
+	// Sad that we can't use a BiMap. :(
+	static {
+		Map<Class<?>, Class<?>> primToWrap = new HashMap<Class<?>, Class<?>>(16);
+		Map<Class<?>, Class<?>> wrapToPrim = new HashMap<Class<?>, Class<?>>(16);
+
+		add(primToWrap, wrapToPrim, boolean.class, Boolean.class);
+		add(primToWrap, wrapToPrim, byte.class, Byte.class);
+		add(primToWrap, wrapToPrim, char.class, Character.class);
+		add(primToWrap, wrapToPrim, double.class, Double.class);
+		add(primToWrap, wrapToPrim, float.class, Float.class);
+		add(primToWrap, wrapToPrim, int.class, Integer.class);
+		add(primToWrap, wrapToPrim, long.class, Long.class);
+		add(primToWrap, wrapToPrim, short.class, Short.class);
+		add(primToWrap, wrapToPrim, void.class, Void.class);
+
+		PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
+		WRAPPER_TO_PRIMITIVE_TYPE = Collections.unmodifiableMap(wrapToPrim);
+	}
+
+	private static void add(Map<Class<?>, Class<?>> forward,
+			Map<Class<?>, Class<?>> backward, Class<?> key, Class<?> value) {
+		forward.put(key, value);
+		backward.put(value, key);
+	}
+
+	/**
+	 * Returns true if this type is a primitive.
+	 */
+	public static boolean isPrimitive(Type type) {
+		return PRIMITIVE_TO_WRAPPER_TYPE.containsKey(type);
+	}
+
+	/**
+	 * Returns {@code true} if {@code type} is one of the nine primitive-wrapper
+	 * types, such as {@link Integer}.
+	 * 
+	 * @see Class#isPrimitive
+	 */
+	public static boolean isWrapperType(Type type) {
+		return WRAPPER_TO_PRIMITIVE_TYPE.containsKey(checkNotNull(type));
+	}
+
+	/**
+	 * Returns the corresponding wrapper type of {@code type} if it is a
+	 * primitive type; otherwise returns {@code type} itself. Idempotent.
+	 * 
+	 * <pre>
+	 *     wrap(int.class) == Integer.class
+	 *     wrap(Integer.class) == Integer.class
+	 *     wrap(String.class) == String.class
+	 * </pre>
+	 */
+	public static <T> Class<T> wrap(Class<T> type) {
+		// cast is safe: long.class and Long.class are both of type Class<Long>
+		@SuppressWarnings("unchecked")
+		Class<T> wrapped = (Class<T>) PRIMITIVE_TO_WRAPPER_TYPE
+				.get(checkNotNull(type));
+		return (wrapped == null) ? type : wrapped;
+	}
+
+	/**
+	 * Returns the corresponding primitive type of {@code type} if it is a
+	 * wrapper type; otherwise returns {@code type} itself. Idempotent.
+	 * 
+	 * <pre>
+	 *     unwrap(Integer.class) == int.class
+	 *     unwrap(int.class) == int.class
+	 *     unwrap(String.class) == String.class
+	 * </pre>
+	 */
+	public static <T> Class<T> unwrap(Class<T> type) {
+		// cast is safe: long.class and Long.class are both of type Class<Long>
+		@SuppressWarnings("unchecked")
+		Class<T> unwrapped = (Class<T>) WRAPPER_TO_PRIMITIVE_TYPE
+				.get(checkNotNull(type));
+		return (unwrapped == null) ? type : unwrapped;
+	}
+	
+	public static <T> T checkNotNull(T obj) {
+		if (obj == null) {
+			throw new NullPointerException();
+		}
+		return obj;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/StructureModifier.java

@@ -0,0 +1,463 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Modifier;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
+import com.comphenix.protocol.reflect.instances.DefaultInstances;
+import com.google.common.base.Function;
+import com.google.common.collect.ImmutableList;
+
+/**
+ * Provides list-oriented access to the fields of a Minecraft packet.
+ * <p>
+ * Implemented by using reflection. Use a CompiledStructureModifier, if speed is essential.
+ * 
+ * @author Kristian
+ * @param <TField> Type of the fields to retrieve.
+ */
+@SuppressWarnings("rawtypes")
+public class StructureModifier<TField> {
+	
+	// Object and its type
+	protected Class targetType;
+	protected Object target;
+	
+	// Converter. May be NULL.
+	protected EquivalentConverter<TField> converter;
+	
+	// The fields to read in order
+	protected Class fieldType;
+	protected List<Field> data = new ArrayList<Field>();
+	
+	// Improved default values
+	protected Map<Field, Integer> defaultFields;
+	
+	// Cache of previous types
+	protected Map<Class, StructureModifier> subtypeCache;
+	
+	// Whether or subclasses should handle conversion
+	protected boolean customConvertHandling;
+	
+	/**
+	 * Creates a structure modifier.
+	 * @param targetType - the structure to modify.
+	 * @param superclassExclude - a superclass to exclude.
+	 * @param requireDefault - whether or not we will be using writeDefaults().
+	 */
+	public StructureModifier(Class targetType, Class superclassExclude, boolean requireDefault) {
+		List<Field> fields = getFields(targetType, superclassExclude);
+		Map<Field, Integer> defaults = requireDefault ? generateDefaultFields(fields) : new HashMap<Field, Integer>();
+		
+		initialize(targetType, Object.class, fields, defaults, null, new ConcurrentHashMap<Class, StructureModifier>());
+	}
+	
+	/**
+	 * Consumers of this method should call "initialize".
+	 */
+	protected StructureModifier() {
+		
+	}
+	
+	/**
+	 * Initialize using the same field types.
+	 * @param other - information to set.
+	 */
+	protected void initialize(StructureModifier<TField> other) {
+		initialize(other.targetType, other.fieldType, other.data, 
+				   other.defaultFields, other.converter, other.subtypeCache);
+	}
+	
+	/**
+	 * Initialize every field of this class.
+	 * @param targetType - type of the object we're reading and writing from.
+	 * @param fieldType - the common type of the fields we're modifying.
+	 * @param data - list of fields to modify.
+	 * @param defaultFields - list of fields that will be automatically initialized.
+	 * @param converter - converts between the common field type and the actual type the consumer expects.
+	 * @param subTypeCache - a structure modifier cache.
+	 */
+	protected void initialize(Class targetType, Class fieldType, 
+			  List<Field> data, Map<Field, Integer> defaultFields,
+			  EquivalentConverter<TField> converter, Map<Class, StructureModifier> subTypeCache) {
+		this.targetType = targetType;
+		this.fieldType = fieldType;
+		this.data = data;
+		this.defaultFields = defaultFields;
+		this.converter = converter;
+		this.subtypeCache = subTypeCache;
+	}
+	
+	/**
+	 * Reads the value of a field given its index.
+	 * @param fieldIndex - index of the field.
+	 * @return Value of the field.
+	 * @throws FieldAccessException The field doesn't exist, or it cannot be accessed under the current security contraints.
+	 */
+	@SuppressWarnings("unchecked")
+	public TField read(int fieldIndex) throws FieldAccessException {
+		if (fieldIndex < 0 || fieldIndex >= data.size())
+			throw new FieldAccessException("Field index must be within 0 - count", 
+					new IndexOutOfBoundsException("Out of bounds"));
+		if (target == null)
+			throw new IllegalStateException("Cannot read from a NULL target.");
+		
+		try {
+			Object result = FieldUtils.readField(data.get(fieldIndex), target, true);
+			
+			// Use the converter, if we have it
+			if (needConversion())
+				return converter.getSpecific(result);
+			else
+				return (TField) result;
+			
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot read field due to a security limitation.", e);
+		}
+	}
+
+	/**
+	 * Reads the value of a field if and ONLY IF it exists.
+	 * @param fieldIndex - index of the field.
+	 * @return Value of the field, or NULL if it doesn't exist.
+	 * @throws FieldAccessException The field cannot be accessed under the current security contraints.
+	 */
+	public TField readSafely(int fieldIndex) throws FieldAccessException {
+		if (fieldIndex >= 0 && fieldIndex < data.size()) {
+			return read(fieldIndex);
+		} else {
+			return null;
+		}
+	}
+	
+	/**
+	 * Writes the value of a field given its index.
+	 * @param fieldIndex - index of the field.
+	 * @param value - new value of the field.
+	 * @return This structure modifier - for chaining.
+	 * @throws FieldAccessException The field doesn't exist, or it cannot be accessed under the current security contraints.
+	 */
+	public StructureModifier<TField> write(int fieldIndex, TField value) throws FieldAccessException {
+		if (fieldIndex < 0 || fieldIndex >= data.size())
+			throw new FieldAccessException("Field index must be within 0 - count", 
+					new IndexOutOfBoundsException("Out of bounds"));
+		if (target == null)
+			throw new IllegalStateException("Cannot write to a NULL target.");
+		
+		// Use the converter, if it exists
+		Object obj = needConversion() ? converter.getGeneric(value) : value;
+		
+		try {
+			FieldUtils.writeField(data.get(fieldIndex), target, obj, true);
+		} catch (IllegalAccessException e) {
+			throw new FieldAccessException("Cannot read field due to a security limitation.", e);
+		}
+		
+		// Make this method chainable
+		return this;
+	}
+	
+	/**
+	 * Whether or not we should use the converter instance.
+	 * @return TRUE if we should, FALSE otherwise.
+	 */
+	private final boolean needConversion() {
+		return converter != null && !customConvertHandling;
+	}
+	
+	/**
+	 * Writes the value of a given field IF and ONLY if it exists.
+	 * @param fieldIndex - index of the potential field.
+	 * @param value - new value of the field.
+	 * @return This structure modifer - for chaining.
+	 * @throws FieldAccessException The field cannot be accessed under the current security contraints.
+	 */
+	public StructureModifier<TField> writeSafely(int fieldIndex, TField value) throws FieldAccessException {
+		if (fieldIndex >= 0 && fieldIndex < data.size()) {
+			write(fieldIndex, value);
+		}
+		return this;
+	}
+	
+	/**
+	 * Correctly modifies the value of a field.
+	 * @param fieldIndex - index of the field to modify.
+	 * @param select - the function that modifies the field value.
+	 * @return This structure modifier - for chaining.
+	 * @throws FieldAccessException The field cannot be accessed under the current security contraints.
+	 */
+	public StructureModifier<TField> modify(int fieldIndex, Function<TField, TField> select) throws FieldAccessException {
+		TField value = read(fieldIndex);
+		return write(fieldIndex, select.apply(value));
+	}
+	
+	/**
+	 * Retrieves a structure modifier that only reads and writes fields of a given type.
+	 * @param fieldType - the type, or supertype, of every field to modify.
+	 * @return A structure modifier for fields of this type.
+	 */
+	public <T> StructureModifier<T> withType(Class fieldType) {
+		return withType(fieldType, null);
+	}
+	
+	/**
+	 * Sets all non-primitive fields to a more fitting default value. See {@link DefaultInstances#getDefault(Class)}.
+	 * @return The current structure modifier - for chaining.
+	 * @throws FieldAccessException If we're unable to write to the fields due to a security limitation.
+	 */
+	public StructureModifier<TField> writeDefaults() throws FieldAccessException {
+		
+		DefaultInstances generator = DefaultInstances.DEFAULT;
+		
+		// Write a default instance to every field
+		for (Field field : defaultFields.keySet()) {
+			try {
+				FieldUtils.writeField(field, target, 
+						generator.getDefault(field.getType()), true);
+			} catch (IllegalAccessException e) {
+				throw new FieldAccessException("Cannot write to field due to a security limitation.", e);
+			}
+		}
+		
+		return this;
+	}
+	
+	/**
+	 * Retrieves a structure modifier that only reads and writes fields of a given type.
+	 * @param fieldType - the type, or supertype, of every field to modify.
+	 * @param converter - converts objects into the given type.
+	 * @return A structure modifier for fields of this type.
+	 */
+	@SuppressWarnings("unchecked")
+	public <T> StructureModifier<T> withType(Class fieldType, EquivalentConverter<T> converter) {
+		
+		StructureModifier<T> result = subtypeCache.get(fieldType);
+		
+		// Do we need to update the cache?
+		if (result == null) {
+			List<Field> filtered = new ArrayList<Field>();
+			Map<Field, Integer> defaults = new HashMap<Field, Integer>();
+			int index = 0;
+			
+			for (Field field : data) {
+				if (fieldType != null && fieldType.isAssignableFrom(field.getType())) {
+					filtered.add(field);
+					
+					// Don't use the original index
+					if (defaultFields.containsKey(field))
+						defaults.put(field, index);
+				}
+				
+				// Keep track of the field index
+				index++;
+			}
+			
+			// Cache structure modifiers
+			result = withFieldType(fieldType, filtered, defaults, converter);
+			
+			if (fieldType != null) {
+				subtypeCache.put(fieldType, result);
+				
+				// Automatically compile the structure modifier
+				if (BackgroundCompiler.getInstance() != null) 
+					BackgroundCompiler.getInstance().scheduleCompilation(subtypeCache, fieldType);
+			}
+		}
+		
+		// Add the target too
+		result = result.withTarget(target);
+		
+		// And the converter, if it's needed
+		if (!sameConverter(result.converter, converter)) {
+			result = result.withConverter(converter);
+		}
+		
+		return result;
+	}
+	
+	private boolean sameConverter(EquivalentConverter<?> a, EquivalentConverter<?> b) {
+		// Compare the converter types
+		if (a == null)
+			return b == null;
+		else if (b == null)
+			return a == null;
+		else
+			return a.getSpecificType().equals(b.getSpecificType());
+	}
+	
+	/**
+	 * Retrieves the common type of each field.
+	 * @return Common type of each field.
+	 */
+	public Class getFieldType() {
+		return fieldType;
+	}
+	
+	/**
+	 * Retrieves the type of the object we're modifying.
+	 * @return Type of the object.
+	 */
+	public Class getTargetType() {
+		return targetType;
+	}
+	
+	/**
+	 * Retrieves the object we're currently modifying.
+	 * @return Object we're modifying.
+	 */
+	public Object getTarget() {
+		return target;
+	}
+	
+	/**
+	 * Retrieve the number of readable types.
+	 * @return Readable types.
+	 */
+	public int size() {
+		return data.size();
+	}
+	
+	/**
+	 * Create a new structure modifier for the new field type.
+	 * @param fieldType - common type of each field.
+	 * @param filtered - list of fields after filtering the original modifier.
+	 * @param defaults - list of default values after filtering the original.
+	 * @param converter - the new converter.
+	 * @return A new structure modifier.
+	 */
+	protected <T> StructureModifier<T> withFieldType(
+			Class fieldType, List<Field> filtered, 
+			Map<Field, Integer> defaults, EquivalentConverter<T> converter) {
+		
+		StructureModifier<T> result = new StructureModifier<T>();
+		result.initialize(targetType, fieldType, filtered, defaults, 
+						  converter, new ConcurrentHashMap<Class, StructureModifier>());
+		return result;
+	}
+	
+	/**
+	 * Retrieves a structure modifier of the same type for a different object target.
+	 * @param target - different target of the same type.
+	 * @return Structure modifier with the new target.
+	 */
+	public StructureModifier<TField> withTarget(Object target) {
+		StructureModifier<TField> copy = new StructureModifier<TField>();
+		
+		// Create a new instance
+		copy.initialize(targetType, fieldType, data, defaultFields, converter, subtypeCache);
+		copy.target = target;
+		return copy;
+	}
+	
+	/**
+	 * Retrieves a structure modifier with the same type and target, but using a new object converter.
+	 * @param converter - the object converter to use.
+	 * @return Structure modifier with the new converter.
+	 */
+	@SuppressWarnings("unchecked")
+	private <T> StructureModifier<T> withConverter(EquivalentConverter<T> converter) {
+		StructureModifier copy = withTarget(target);
+		
+		copy.setConverter(converter);
+		return copy;
+	}
+	
+	/**
+	 * Set the current object converter. Should only be called during construction.
+	 * @param converter - current object converter.
+	 */
+	protected void setConverter(EquivalentConverter<TField> converter) {
+		this.converter = converter;
+	}
+	
+	/**
+	 * Retrieves a list of the fields matching the constraints of this structure modifier.
+	 * @return List of fields.
+	 */
+	public List<Field> getFields() {
+		return ImmutableList.copyOf(data);
+	}
+
+	/**
+	 * Retrieve every value stored in the fields of the current type.
+	 * @return Every field value.
+	 * @throws FieldAccessException Unable to access one or all of the fields
+	 */
+	public List<TField> getValues() throws FieldAccessException {
+		List<TField> values = new ArrayList<TField>();
+		
+		for (int i = 0; i < size(); i++) {
+			values.add(read(i));
+		}
+		
+		return values;
+	}
+	
+	// Used to generate plausible default values
+	private static Map<Field, Integer> generateDefaultFields(List<Field> fields) {
+		
+		Map<Field, Integer> requireDefaults = new HashMap<Field, Integer>();
+		DefaultInstances generator = DefaultInstances.DEFAULT;
+		int index = 0;
+		
+		for (Field field : fields) {
+			Class<?> type = field.getType();
+			
+			// First, ignore primitive fields
+			if (!PrimitiveUtils.isPrimitive(type)) {
+				// Next, see if we actually can generate a default value
+				if (generator.getDefault(type) != null) {
+					// If so, require it
+					requireDefaults.put(field, index);
+				}
+			}
+			
+			// Increment field index
+			index++;
+		}
+		
+		return requireDefaults;
+	}
+	
+	// Used to filter out irrelevant fields
+	private static List<Field> getFields(Class type, Class superclassExclude) {
+		List<Field> result = new ArrayList<Field>();
+		
+		// Retrieve every private and public field
+		for (Field field : FuzzyReflection.fromClass(type, true).getFields()) {
+			int mod = field.getModifiers();
+			
+			// Ignore static, final and "abstract packet" fields
+			if (!Modifier.isFinal(mod) && !Modifier.isStatic(mod) && (
+					superclassExclude == null || !field.getDeclaringClass().equals(superclassExclude)
+				)) {
+				
+				result.add(field);
+			}
+		}
+		
+		return result;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/VolatileField.java

@@ -1,158 +1,187 @@
-package com.comphenix.protocol.reflect;
-
-import java.lang.reflect.Field;
-
-
-/**
- * Represents a field that will revert to its original state when this class is garbaged collected.
- * 
- * @author Kristian
- */
-public class VolatileField {
-
-	private Field field;
-	private Object container;
-	
-	// The current and previous values
-	private Object previous;
-	private Object current;
-	
-	// Whether or not we must reset or load
-	private boolean previousLoaded;
-	private boolean currentSet;
-
-	// Whether or not to break access restrictions
-	private boolean forceAccess;
-	
-	/**
-	 * Initializes a volatile field with an associated object.
-	 * @param field - the field.
-	 * @param container - the object this field belongs to.
-	 */
-	public VolatileField(Field field, Object container) {
-		this.field = field;
-		this.container = container;
-	}
-	
-	/**
-	 * Initializes a volatile field with an associated object.
-	 * @param field - the field.
-	 * @param container - the object this field belongs to.
-	 * @param forceAccess - whether or not to override any scope restrictions.
-	 */
-	public VolatileField(Field field, Object container, boolean forceAccess) {
-		this.field = field;
-		this.container = container;
-		this.forceAccess = forceAccess;
-	}
-	
-	/**
-	 * Retrieves the current field.
-	 * @return The stored field.
-	 */
-	public Field getField() {
-		return field;
-	}
-	
-	/**
-	 * Retrieves the object the field is stored.
-	 * @return The reference object.
-	 */
-	public Object getContainer() {
-		return container;
-	}
-	
-	/**
-	 * Retrieves whether or not not to override any scope restrictions.
-	 * @return TRUE if we override scope, FALSE otherwise.
-	 */
-	public boolean isForceAccess() {
-		return forceAccess;
-	}
-
-	/**
-	 * Sets whether or not not to override any scope restrictions.
-	 * @param forceAccess - TRUE if we override scope, FALSE otherwise.
-	 */
-	public void setForceAccess(boolean forceAccess) {
-		this.forceAccess = forceAccess;
-	}
-
-	/**
-	 * Retrieves the current field value.
-	 * @return The current field value.
-	 */
-	public Object getValue() {
-		// Retrieve the correct value
-		if (!currentSet) {
-			ensureLoaded();
-			return previous;
-		} else {
-			return current;
-		}
-	}
-	
-	/**
-	 * Retrieves the field value before the previous setValue(), unless saveValue() has been called.
-	 * @return Previous value.
-	 */
-	public Object getOldValue() {
-		ensureLoaded();
-		return previous;
-	}
-	
-	/**
-	 * Sets the current value. This will be reverted unless saveValue() is called.
-	 * @param newValue - new field value.
-	 */
-	public void setValue(Object newValue) {
-		
-		// Remember to safe the previous value
-		ensureLoaded();
-		
-		try {
-			FieldUtils.writeField(field, container, newValue, forceAccess);
-			current = newValue;
-			currentSet = true;
-			
-		} catch (IllegalAccessException e) {
-			throw new RuntimeException("Unable to read field " + field.getName(), e);
-		}
-	}
-	
-	/**
-	 * Ensure that the current value is still set after this class has been garbaged collected.
-	 */
-	public void saveValue() {
-		previous = current;
-		currentSet = false;
-	}
-	
-	/**
-	 * Revert to the previously set value.
-	 */
-	public void revertValue() {
-		// Reset value.
-		if (currentSet) {
-			setValue(previous);
-			currentSet = false;
-		}
-	}
-	
-	private void ensureLoaded() {
-		// Load the value if we haven't already
-		if (!previousLoaded) {
-			try {
-				previous = FieldUtils.readField(field, container, forceAccess);
-				previousLoaded = true;
-			} catch (IllegalAccessException e) {
-				throw new RuntimeException("Unable to read field " + field.getName(), e);
-			}
-		}
-	}
-		
-	@Override
-	protected void finalize() throws Throwable {
-		revertValue();
-	}
-}
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect;
+
+import java.lang.reflect.Field;
+
+/**
+ * Represents a field that will revert to its original state when this class is garbaged collected.
+ * 
+ * @author Kristian
+ */
+public class VolatileField {
+
+	private Field field;
+	private Object container;
+	
+	// The current and previous values
+	private Object previous;
+	private Object current;
+	
+	// Whether or not we must reset or load
+	private boolean previousLoaded;
+	private boolean currentSet;
+
+	// Whether or not to break access restrictions
+	private boolean forceAccess;
+	
+	/**
+	 * Initializes a volatile field with an associated object.
+	 * @param field - the field.
+	 * @param container - the object this field belongs to.
+	 */
+	public VolatileField(Field field, Object container) {
+		this.field = field;
+		this.container = container;
+	}
+	
+	/**
+	 * Initializes a volatile field with an associated object.
+	 * @param field - the field.
+	 * @param container - the object this field belongs to.
+	 * @param forceAccess - whether or not to override any scope restrictions.
+	 */
+	public VolatileField(Field field, Object container, boolean forceAccess) {
+		this.field = field;
+		this.container = container;
+		this.forceAccess = forceAccess;
+	}
+	
+	/**
+	 * Retrieves the current field.
+	 * @return The stored field.
+	 */
+	public Field getField() {
+		return field;
+	}
+	
+	/**
+	 * Retrieves the object the field is stored.
+	 * @return The reference object.
+	 */
+	public Object getContainer() {
+		return container;
+	}
+	
+	/**
+	 * Retrieves whether or not not to override any scope restrictions.
+	 * @return TRUE if we override scope, FALSE otherwise.
+	 */
+	public boolean isForceAccess() {
+		return forceAccess;
+	}
+
+	/**
+	 * Sets whether or not not to override any scope restrictions.
+	 * @param forceAccess - TRUE if we override scope, FALSE otherwise.
+	 */
+	public void setForceAccess(boolean forceAccess) {
+		this.forceAccess = forceAccess;
+	}
+
+	/**
+	 * Retrieves the current field value.
+	 * @return The current field value.
+	 */
+	public Object getValue() {
+		// Retrieve the correct value
+		if (!currentSet) {
+			ensureLoaded();
+			return previous;
+		} else {
+			return current;
+		}
+	}
+	
+	/**
+	 * Retrieves the field value before the previous setValue(), unless saveValue() has been called.
+	 * @return Previous value.
+	 */
+	public Object getOldValue() {
+		ensureLoaded();
+		return previous;
+	}
+	
+	/**
+	 * Sets the current value. This will be reverted unless saveValue() is called.
+	 * @param newValue - new field value.
+	 */
+	public void setValue(Object newValue) {
+		
+		// Remember to safe the previous value
+		ensureLoaded();
+		
+		try {
+			FieldUtils.writeField(field, container, newValue, forceAccess);
+			current = newValue;
+			currentSet = true;
+			
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException("Unable to read field " + field.getName(), e);
+		}
+	}
+	
+	/**
+	 * Ensure that the current value is still set after this class has been garbaged collected.
+	 */
+	public void saveValue() {
+		previous = current;
+		currentSet = false;
+	}
+	
+	/**
+	 * Revert to the previously set value.
+	 */
+	public void revertValue() {
+		// Reset value if it hasn't been changed by anyone else
+		if (currentSet) {
+			if (getValue() == current) {
+				setValue(previous);
+				currentSet = false;
+			} else {
+				// This can be a bad sign
+				System.out.println(String.format("[ProtocolLib] Unable to switch %s to %s. Expected %s but got %s.",
+						field.toGenericString(), previous, current, getValue()));
+			}
+		}
+	}
+	
+	/**
+	 * Determine whether or not we'll need to revert the value.
+	 */
+	public boolean isCurrentSet() {
+		return currentSet;
+	}
+	
+	private void ensureLoaded() {
+		// Load the value if we haven't already
+		if (!previousLoaded) {
+			try {
+				previous = FieldUtils.readField(field, container, forceAccess);
+				previousLoaded = true;
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException("Unable to read field " + field.getName(), e);
+			}
+		}
+	}
+		
+	@Override
+	protected void finalize() throws Throwable {
+		revertValue();
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/compiler/BackgroundCompiler.java

@@ -0,0 +1,200 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect.compiler;
+
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.comphenix.protocol.reflect.StructureModifier;
+
+/**
+ * Compiles structure modifiers on a background thread.
+ * <p>
+ * This is necessary as we cannot block the main thread.
+ * 
+ * @author Kristian
+ */
+public class BackgroundCompiler {
+
+	// How long to wait for a shutdown
+	public static final int SHUTDOWN_DELAY_MS = 2000;
+	
+	// The single background compiler we're using
+	private static BackgroundCompiler backgroundCompiler;
+	
+	private StructureCompiler compiler;
+	private boolean enabled;
+	private boolean shuttingDown;
+	
+	private ExecutorService executor;
+	
+	/**
+	 * Retrieves the current background compiler.
+	 * @return Current background compiler.
+	 */
+	public static BackgroundCompiler getInstance() {
+		return backgroundCompiler;
+	}
+	
+	/**
+	 * Sets the single background compiler we're using.
+	 * @param backgroundCompiler - current background compiler, or NULL if the library is not loaded.
+	 */
+	public static void setInstance(BackgroundCompiler backgroundCompiler) {
+		BackgroundCompiler.backgroundCompiler = backgroundCompiler;
+	}
+	
+	/**
+	 * Initialize a background compiler.
+	 * @param loader - class loader from Bukkit.
+	 */
+	public BackgroundCompiler(ClassLoader loader) {
+		this(loader, Executors.newSingleThreadExecutor());
+	}
+
+	/**
+	 * Initialize a background compiler utilizing the given thread pool.
+	 * @param loader - class loader from Bukkit.
+	 * @param executor - thread pool we'll use.
+	 */
+	public BackgroundCompiler(ClassLoader loader, ExecutorService executor) {
+		if (loader == null)
+			throw new IllegalArgumentException("loader cannot be NULL");
+		if (executor == null)
+			throw new IllegalArgumentException("executor cannot be NULL");
+		
+		this.compiler = new StructureCompiler(loader);
+		this.executor = executor;
+		this.enabled = true;
+	}
+	
+	/**
+	 * Ensure that the indirectly given structure modifier is eventually compiled.
+	 * @param cache - store of structure modifiers.
+	 * @param key - key of the structure modifier to compile.
+	 */
+	@SuppressWarnings("rawtypes")
+	public void scheduleCompilation(final Map<Class, StructureModifier> cache, final Class key) {
+		
+		@SuppressWarnings("unchecked")
+		final StructureModifier<Object> uncompiled = cache.get(key);
+		
+		if (uncompiled != null) {
+			scheduleCompilation(uncompiled, new CompileListener<Object>() {
+				@Override
+				public void onCompiled(StructureModifier<Object> compiledModifier) {
+					// Update cache
+					cache.put(key, compiledModifier);
+				}
+			});
+		}
+	}
+	
+	/**
+	 * Ensure that the given structure modifier is eventually compiled.
+	 * @param uncompiled - structure modifier to compile.
+	 * @param listener - listener responsible for responding to the compilation.
+	 */
+	public <TKey> void scheduleCompilation(final StructureModifier<TKey> uncompiled, final CompileListener<TKey> listener) {
+
+		// Only schedule if we're enabled
+		if (enabled && !shuttingDown) {
+			
+			// Don't try to schedule anything
+			if (executor == null || executor.isShutdown())
+				return;
+			
+			try {
+				executor.submit(new Callable<Object>() {
+					@Override
+					public Object call() throws Exception {
+		
+						StructureModifier<TKey> modifier = uncompiled;
+						
+						// Do our compilation
+						modifier = compiler.compile(modifier);
+						listener.onCompiled(modifier);
+						
+						// We'll also return the new structure modifier
+						return modifier;
+					}
+				});
+			} catch (RejectedExecutionException e) {
+				// Occures when the underlying queue is overflowing. Since the compilation  
+				// is only an optmization and not really essential we'll just log this failure 
+				// and move on.
+				Logger.getLogger("Minecraft").log(Level.WARNING, "Unable to schedule compilation task.", e);
+			}
+		}
+	}
+	
+	/**
+	 * Clean up after ourselves using the default timeout.
+	 */
+	public void shutdownAll() {
+		shutdownAll(SHUTDOWN_DELAY_MS, TimeUnit.MILLISECONDS);
+	}
+	
+	/**
+	 * Clean up after ourselves.
+	 * @param timeout - the maximum time to wait.
+	 * @param unit - the time unit of the timeout argument.
+	 */
+	public void shutdownAll(long timeout, TimeUnit unit) {
+		setEnabled(false);
+		shuttingDown = true;
+		executor.shutdown();
+		
+		try {
+			executor.awaitTermination(timeout, unit);
+		} catch (InterruptedException e) {
+			// Unlikely to ever occur.
+			e.printStackTrace();
+		}
+	}
+	
+	/**
+	 * Retrieve whether or not the background compiler is enabled.
+	 * @return TRUE if it is enabled, FALSE otherwise.
+	 */
+	public boolean isEnabled() {
+		return enabled;
+	}
+
+	/**
+	 * Sets whether or not the background compiler is enabled.
+	 * @param enabled - TRUE to enable it, FALSE otherwise.
+	 */
+	public void setEnabled(boolean enabled) {
+		this.enabled = enabled;
+	}
+
+	/**
+	 * Retrieve the current structure compiler.
+	 * @return Current structure compiler.
+	 */
+	public StructureCompiler getCompiler() {
+		return compiler;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/compiler/BoxingHelper.java

@@ -0,0 +1,292 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect.compiler;
+
+import net.sf.cglib.asm.*;
+
+/**
+ * Used by the compiler to automatically box and unbox values.
+ */
+class BoxingHelper {
+
+	private final static Type BYTE_TYPE = Type.getObjectType("java/lang/Byte");
+	private final static Type BOOLEAN_TYPE = Type.getObjectType("java/lang/Boolean");
+	private final static Type SHORT_TYPE = Type.getObjectType("java/lang/Short");
+	private final static Type CHARACTER_TYPE = Type.getObjectType("java/lang/Character");
+	private final static Type INTEGER_TYPE = Type.getObjectType("java/lang/Integer");
+	private final static Type FLOAT_TYPE = Type.getObjectType("java/lang/Float");
+	private final static Type LONG_TYPE = Type.getObjectType("java/lang/Long");
+	private final static Type DOUBLE_TYPE = Type.getObjectType("java/lang/Double");
+	private final static Type NUMBER_TYPE = Type.getObjectType("java/lang/Number");
+	private final static Type OBJECT_TYPE = Type.getObjectType("java/lang/Object");
+
+	private final static MethodDescriptor BOOLEAN_VALUE = MethodDescriptor.getMethod("boolean booleanValue()");
+	private final static MethodDescriptor CHAR_VALUE = MethodDescriptor.getMethod("char charValue()");
+	private final static MethodDescriptor INT_VALUE = MethodDescriptor.getMethod("int intValue()");
+	private final static MethodDescriptor FLOAT_VALUE = MethodDescriptor.getMethod("float floatValue()");
+	private final static MethodDescriptor LONG_VALUE = MethodDescriptor.getMethod("long longValue()");
+	private final static MethodDescriptor DOUBLE_VALUE = MethodDescriptor.getMethod("double doubleValue()");
+
+	private MethodVisitor mv;
+	
+	public BoxingHelper(MethodVisitor mv) {
+		this.mv = mv;
+	}
+	
+	/**
+	 * Generates the instructions to box the top stack value. This value is
+	 * replaced by its boxed equivalent on top of the stack.
+	 *
+	 * @param type the type of the top stack value.
+	 */
+	public void box(final Type type){
+		if(type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY) {
+			return;
+		}
+		
+		if(type == Type.VOID_TYPE) {
+			push((String) null);
+		} else {
+			Type boxed = type;
+			
+			switch(type.getSort()) {
+				case Type.BYTE:
+					boxed = BYTE_TYPE;
+					break;
+				case Type.BOOLEAN:
+					boxed = BOOLEAN_TYPE;
+					break;
+				case Type.SHORT:
+					boxed = SHORT_TYPE;
+					break;
+				case Type.CHAR:
+					boxed = CHARACTER_TYPE;
+					break;
+				case Type.INT:
+					boxed = INTEGER_TYPE;
+					break;
+				case Type.FLOAT:
+					boxed = FLOAT_TYPE;
+					break;
+				case Type.LONG:
+					boxed = LONG_TYPE;
+					break;
+				case Type.DOUBLE:
+					boxed = DOUBLE_TYPE;
+					break;
+			}
+			
+			newInstance(boxed);
+			if(type.getSize() == 2) {
+				// Pp -> Ppo -> oPpo -> ooPpo -> ooPp -> o
+				dupX2();
+				dupX2();
+				pop();
+			} else {
+				// p -> po -> opo -> oop -> o
+				dupX1();
+				swap();
+			}
+			
+			invokeConstructor(boxed, new MethodDescriptor("<init>", Type.VOID_TYPE, new Type[] {type}));
+		}
+	}
+	
+	/**
+	 * Generates the instruction to invoke a constructor.
+	 *
+	 * @param type   the class in which the constructor is defined.
+	 * @param method the constructor to be invoked.
+	 */
+	public void invokeConstructor(final Type type, final MethodDescriptor method){
+		invokeInsn(Opcodes.INVOKESPECIAL, type, method);
+	}
+	
+	/**
+	 * Generates a DUP_X1 instruction.
+	 */
+	public void dupX1(){
+		mv.visitInsn(Opcodes.DUP_X1);
+	}
+
+	/**
+	 * Generates a DUP_X2 instruction.
+	 */
+	public void dupX2(){
+		mv.visitInsn(Opcodes.DUP_X2);
+	}
+	
+	/**
+	 * Generates a POP instruction.
+	 */
+	public void pop(){
+		mv.visitInsn(Opcodes.POP);
+	}
+
+	/**
+	 * Generates a SWAP instruction.
+	 */
+	public void swap(){
+		mv.visitInsn(Opcodes.SWAP);
+	}
+	
+	/**
+	 * Generates the instruction to push the given value on the stack.
+	 *
+	 * @param value the value to be pushed on the stack.
+	 */
+	public void push(final boolean value){
+		push(value ? 1 : 0);
+	}
+	
+	/**
+	 * Generates the instruction to push the given value on the stack.
+	 * 
+	 * @param value the value to be pushed on the stack.
+	 */
+	public void push(final int value) {
+		if (value >= -1 && value <= 5) {
+			mv.visitInsn(Opcodes.ICONST_0 + value);
+		} else if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
+			mv.visitIntInsn(Opcodes.BIPUSH, value);
+		} else if (value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
+			mv.visitIntInsn(Opcodes.SIPUSH, value);
+		} else {
+			mv.visitLdcInsn(new Integer(value));
+		}
+	}
+
+	/**
+	 * Generates the instruction to create a new object.
+	 *
+	 * @param type the class of the object to be created.
+	 */
+	public void newInstance(final Type type){
+		typeInsn(Opcodes.NEW, type);
+	}
+	
+	/**
+	 * Generates the instruction to push the given value on the stack.
+	 * 
+	 * @param value the value to be pushed on the stack. May be <tt>null</tt>.
+	 */
+	public void push(final String value) {
+		if (value == null) {
+			mv.visitInsn(Opcodes.ACONST_NULL);
+		} else {
+			mv.visitLdcInsn(value);
+		}
+	}
+
+	/**
+	 * Generates the instructions to unbox the top stack value. This value is
+	 * replaced by its unboxed equivalent on top of the stack.
+	 * 
+	 * @param type
+	 *            the type of the top stack value.
+	 */
+	public void unbox(final Type type){
+		Type t = NUMBER_TYPE;
+		MethodDescriptor sig = null;
+		
+		switch(type.getSort()) {
+			case Type.VOID:
+				return;
+			case Type.CHAR:
+				t = CHARACTER_TYPE;
+				sig = CHAR_VALUE;
+				break;
+			case Type.BOOLEAN:
+				t = BOOLEAN_TYPE;
+				sig = BOOLEAN_VALUE;
+				break;
+			case Type.DOUBLE:
+				sig = DOUBLE_VALUE;
+				break;
+			case Type.FLOAT:
+				sig = FLOAT_VALUE;
+				break;
+			case Type.LONG:
+				sig = LONG_VALUE;
+				break;
+			case Type.INT:
+			case Type.SHORT:
+			case Type.BYTE:
+				sig = INT_VALUE;
+			}
+		
+		if(sig == null) {
+			checkCast(type);
+		} else {
+			checkCast(t);
+			invokeVirtual(t, sig);
+		}
+	}
+
+	/**
+	 * Generates the instruction to check that the top stack value is of the
+	 * given type.
+	 *
+	 * @param type a class or interface type.
+	 */
+	public void checkCast(final Type type){
+		if(!type.equals(OBJECT_TYPE)) {
+			typeInsn(Opcodes.CHECKCAST, type);
+		}
+	}
+	
+	/**
+	 * Generates the instruction to invoke a normal method.
+	 *
+	 * @param owner  the class in which the method is defined.
+	 * @param method the method to be invoked.
+	 */
+	public void invokeVirtual(final Type owner, final MethodDescriptor method){
+		invokeInsn(Opcodes.INVOKEVIRTUAL, owner, method);
+	}
+	
+	/**
+	 * Generates an invoke method instruction.
+	 *
+	 * @param opcode the instruction's opcode.
+	 * @param type   the class in which the method is defined.
+	 * @param method the method to be invoked.
+	 */
+	private void invokeInsn(final int opcode, final Type type, final MethodDescriptor method){
+		String owner = type.getSort() == Type.ARRAY ? type.getDescriptor() : type.getInternalName();
+		mv.visitMethodInsn(opcode, owner, method.getName(), method.getDescriptor());
+	}
+	
+	/**
+	 * Generates a type dependent instruction.
+	 *
+	 * @param opcode the instruction's opcode.
+	 * @param type   the instruction's operand.
+	 */
+	private void typeInsn(final int opcode, final Type type){
+		String desc;
+		
+		if(type.getSort() == Type.ARRAY) {
+			desc = type.getDescriptor();
+		} else { 
+			desc = type.getInternalName();
+		}
+		
+		mv.visitTypeInsn(opcode, desc);
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/compiler/CompileListener.java

@@ -0,0 +1,34 @@
+/*
+ *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
+ *  Copyright (C) 2012 Kristian S. Stangeland
+ *
+ *  This program is free software; you can redistribute it and/or modify it under the terms of the 
+ *  GNU General Public License as published by the Free Software Foundation; either version 2 of 
+ *  the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ *  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with this program; 
+ *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
+ *  02111-1307 USA
+ */
+
+package com.comphenix.protocol.reflect.compiler;
+
+import com.comphenix.protocol.reflect.StructureModifier;
+
+/**
+ * Used to save the result of an compilation.
+ * 
+ * @author Kristian
+ * @param <TKey> - type of the structure modifier field.
+ */
+public interface CompileListener<TKey> {
+	/**
+	 * Invoked when a structure modifier has been successfully compiled.
+	 * @param compiledModifier - the compiled structure modifier.
+	 */
+	public void onCompiled(StructureModifier<TKey> compiledModifier);
+}