Implement new queue command system.

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.onarandombox.multiversecore</groupId>
     <artifactId>Multiverse-Core</artifactId>
-    <version>4.3.0</version>
+    <version>4.2.3-SNAPSHOT</version>
     <name>Multiverse-Core</name>
     <description>World Management Plugin</description>
     <properties>
@@ -27,13 +27,17 @@
             <url>https://hub.spigotmc.org/nexus/content/groups/public/</url>
         </repository>
         <repository>
-            <id>jitpack.io</id>
-            <url>https://jitpack.io</url>
+            <id>vault-repo</id>
+            <url>http://nexus.hc.to/content/repositories/pub_releases</url>
         </repository>
         <repository>
             <id>minebench-repo</id>
             <url>https://repo.minebench.de/</url>
         </repository>
+        <repository>
+            <id>CodeMC</id>
+            <url>https://repo.codemc.org/repository/maven-public</url>
+        </repository>
     </repositories>
 
     <pluginRepositories>
@@ -219,7 +223,6 @@
                             <goal>shade</goal>
                         </goals>
                         <configuration>
-                            <minimizeJar>true</minimizeJar>
                             <relocations>
                                 <relocation>
                                     <pattern>me.main__.util</pattern>
@@ -302,7 +305,7 @@
         <!-- End of SerializationConfig Dependency -->
         <!-- Start of Economy Dependency -->
         <dependency>
-            <groupId>com.github.MilkBowl</groupId>
+            <groupId>net.milkbowl.vault</groupId>
             <artifactId>VaultAPI</artifactId>
             <version>1.7</version>
             <scope>provided</scope>
@@ -322,7 +325,13 @@
         <dependency>
             <groupId>org.bstats</groupId>
             <artifactId>bstats-bukkit</artifactId>
-            <version>2.2.1</version>
+            <version>1.8</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.bukkit</groupId>
+                    <artifactId>bukkit</artifactId>
+                </exclusion>
+            </exclusions>
         </dependency>
         <dependency>
             <groupId>com.dumptruckman.minecraft</groupId>

src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java

@@ -68,7 +68,6 @@ import com.onarandombox.MultiverseCore.commands.TeleportCommand;
 import com.onarandombox.MultiverseCore.commands.UnloadCommand;
 import com.onarandombox.MultiverseCore.commands.VersionCommand;
 import com.onarandombox.MultiverseCore.commands.WhoCommand;
-import com.onarandombox.MultiverseCore.commandtools.queue.CommandQueueManager;
 import com.onarandombox.MultiverseCore.destination.AnchorDestination;
 import com.onarandombox.MultiverseCore.destination.BedDestination;
 import com.onarandombox.MultiverseCore.destination.CannonDestination;
@@ -205,7 +204,6 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
 
     // Setup our Map for our Commands using the CommandHandler.
     private CommandHandler commandHandler;
-    private CommandQueueManager commandQueueManager;
 
     private static final String LOG_TAG = "[Multiverse-Core]";
 
@@ -290,7 +288,6 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
 
         // Setup the command manager
         this.commandHandler = new CommandHandler(this, this.ph);
-        this.commandQueueManager = new CommandQueueManager(this);
         // Call the Function to assign all the Commands to their Class.
         this.registerCommands();
 
@@ -367,9 +364,7 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
                 // Add global variable "multiverse" to javascript environment
                 buscript.setScriptVariable("multiverse", this);
             } catch (NullPointerException e) {
-                Logging.warning("Buscript failed to load! The script command will be disabled! " +
-                        "If you would like not to see this message, " +
-                        "use `/mv conf enablebuscript false` to disable Buscript from loading.");
+                Logging.warning("Buscript failed to load! The script command will be disabled!");
             }
         }
     }
@@ -922,15 +917,6 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
         return this.commandHandler;
     }
 
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    @Deprecated
-    public CommandQueueManager getCommandQueueManager() {
-        return commandQueueManager;
-    }
-
     /**
      * Gets the log-tag.
      *
@@ -1131,22 +1117,12 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
 
     /**
      * {@inheritDoc}
-     * @deprecated This is deprecated! Do not use!
+     * @deprecated This is deprecated!
      */
     @Override
     @Deprecated
     public Boolean regenWorld(String name, Boolean useNewSeed, Boolean randomSeed, String seed) {
-        return this.worldManager.regenWorld(name, useNewSeed, randomSeed, seed, false);
-    }
-
-    /**
-     * {@inheritDoc}
-     * @deprecated This is deprecated! Do not use!
-     */
-    @Override
-    @Deprecated
-    public Boolean regenWorld(String name, Boolean useNewSeed, Boolean randomSeed, String seed, Boolean keepGameRules) {
-        return this.worldManager.regenWorld(name, useNewSeed, randomSeed, seed, keepGameRules);
+        return this.worldManager.regenWorld(name, useNewSeed, randomSeed, seed);
     }
 
     /**

src/main/java/com/onarandombox/MultiverseCore/MultiverseCoreConfiguration.java

@@ -96,7 +96,7 @@ public class MultiverseCoreConfiguration extends SerializationConfig implements
         // BEGIN CHECKSTYLE-SUPPRESSION: MagicNumberCheck
         enforceaccess = false;
         useasyncchat = true;
-        prefixchat = false;
+        prefixchat = true;
         prefixchatformat = "[%world%]%chat%";
         teleportintercept = true;
         firstspawnoverride = true;

src/main/java/com/onarandombox/MultiverseCore/api/Core.java

@@ -8,7 +8,6 @@
 package com.onarandombox.MultiverseCore.api;
 
 import buscript.Buscript;
-import com.onarandombox.MultiverseCore.commandtools.queue.CommandQueueManager;
 import com.onarandombox.MultiverseCore.destination.DestinationFactory;
 import com.onarandombox.MultiverseCore.utils.AnchorManager;
 import com.onarandombox.MultiverseCore.utils.MVEconomist;
@@ -87,15 +86,6 @@ public interface Core {
      */
     CommandHandler getCommandHandler();
 
-    /**
-     * Manager for command that requires /mv confirm before execution.
-     *
-     * @return A non-null {@link CommandQueueManager}.
-     * @deprecated To be moved to new command manager in 5.0.0
-     */
-    @Deprecated
-    CommandQueueManager getCommandQueueManager();
-
     /**
      * Gets the factory class responsible for loading many different destinations
      * on demand.
@@ -126,38 +116,20 @@ public interface Core {
     AnchorManager getAnchorManager();
 
     /**
-     * Previously used by queued commands to regenerate a world on a delay.
-     * Do not use api method for any other purpose.
+     * Used by queued commands to regenerate a world on a delay.
      *
-     * @param name          Name of the world to regenerate
-     * @param useNewSeed    If a new seed should be used
-     * @param randomSeed    If the new seed should be random
-     * @param seed          The seed of the world.
+     * @param name Name of the world to regenerate
+     * @param useNewSeed If a new seed should be used
+     * @param randomSeed IF the new seed should be random
+     * @param seed The seed of the world.
      *
      * @return True if success, false if fail.
      *
-     * @deprecated Use {@link MVWorldManager#regenWorld(String, boolean, boolean, String, boolean)} instead.
+     * @deprecated Use {@link MVWorldManager#regenWorld(String, boolean, boolean, String)} instead.
      */
     @Deprecated
     Boolean regenWorld(String name, Boolean useNewSeed, Boolean randomSeed, String seed);
 
-    /**
-     * Used by queued commands to regenerate a world on a delay.
-     * Do not use api method for any other purpose.
-     *
-     * @param name          Name of the world to regenerate
-     * @param useNewSeed    If a new seed should be used
-     * @param randomSeed    If the new seed should be random
-     * @param seed          The seed of the world.
-     * @param keepGameRules If GameRules should be kept on world regen.
-     *
-     * @return True if success, false if fail.
-     *
-     * @deprecated Use {@link MVWorldManager#regenWorld(String, boolean, boolean, String, boolean)} instead.
-     */
-    @Deprecated
-    Boolean regenWorld(String name, Boolean useNewSeed, Boolean randomSeed, String seed, Boolean keepGameRules);
-
     /**
      * Decrements the number of plugins that have specifically hooked into core.
      */

src/main/java/com/onarandombox/MultiverseCore/api/MVWorldManager.java

@@ -174,16 +174,6 @@ public interface MVWorldManager {
      */
     MultiverseWorld getMVWorld(String name);
 
-    /**
-     * Returns a {@link MultiverseWorld} if the world with name given exists, and null if it does not.
-     * This will search optionally for alias names.
-     *
-     * @param name          The name or optionally the alias of the world to get.
-     * @param checkAliases  Indicates whether to check for world alias name.
-     * @return A {@link MultiverseWorld} or null.
-     */
-    MultiverseWorld getMVWorld(String name, boolean checkAliases);
-
     /**
      * Returns a {@link MultiverseWorld} if it exists, and null if it does not.
      *
@@ -193,24 +183,13 @@ public interface MVWorldManager {
     MultiverseWorld getMVWorld(World world);
 
     /**
-     * Checks to see if the given name is a valid {@link MultiverseWorld}
-     * Searches based on world name AND alias.
+     * Checks to see if the given name is a valid {@link MultiverseWorld}.
      *
      * @param name The name or alias of the world to check.
      * @return True if the world exists, false if not.
      */
     boolean isMVWorld(String name);
 
-    /**
-     * Checks to see if the given name is a valid {@link MultiverseWorld}.
-     * Optionally searches by alias is specified.
-     *
-     * @param name          The name or alias of the world to check.
-     * @param checkAliases  Indicates whether to check for world alias name.
-     * @return True if the world exists, false if not.
-     */
-    boolean isMVWorld(String name, boolean checkAliases);
-
     /**
      * Checks to see if the given world is a valid {@link MultiverseWorld}.
      *
@@ -313,28 +292,15 @@ public interface MVWorldManager {
     /**
      * Regenerates a world.
      *
-     * @param name          Name of the world to regenerate
-     * @param useNewSeed    If a new seed should be used
-     * @param randomSeed    If the new seed should be random
-     * @param seed          The seed of the world.
+     * @param name Name of the world to regenerate
+     * @param useNewSeed If a new seed should be used
+     * @param randomSeed IF the new seed should be random
+     * @param seed The seed of the world.
      *
      * @return True if success, false if fail.
      */
     boolean regenWorld(String name, boolean useNewSeed, boolean randomSeed, String seed);
 
-    /**
-     * Regenerates a world.
-     *
-     * @param name          Name of the world to regenerate
-     * @param useNewSeed    If a new seed should be used
-     * @param randomSeed    If the new seed should be random
-     * @param seed          The seed of the world.
-     * @param keepGameRules If GameRules should be kept on world regen.
-     *
-     * @return True if success, false if fail.
-     */
-    boolean regenWorld(String name, boolean useNewSeed, boolean randomSeed, String seed, boolean keepGameRules);
-
     boolean isKeepingSpawnInMemory(World world);
     
     /**
@@ -348,11 +314,4 @@ public interface MVWorldManager {
      * does not exist. {@code includeLoaded} if the world exists and is loaded.
      */
     boolean hasUnloadedWorld(String name, boolean includeLoaded);
-
-    /**
-     * Get all the possible worlds that Multiverse has detected to be importable.
-     *
-     * @return A collection of world names that are deemed importable.
-     */
-    Collection<String> getPotentialWorlds();
 }

src/main/java/com/onarandombox/MultiverseCore/commands/CheckCommand.java

@@ -11,7 +11,6 @@ import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVDestination;
 import com.onarandombox.MultiverseCore.destination.InvalidDestination;
 import com.onarandombox.MultiverseCore.utils.MVPermissions;
-import com.onarandombox.MultiverseCore.utils.PlayerFinder;
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
@@ -38,7 +37,7 @@ public class CheckCommand extends MultiverseCommand {
 
     @Override
     public void runCommand(CommandSender sender, List<String> args) {
-        Player p = PlayerFinder.get(args.get(0), sender);
+        Player p = this.plugin.getServer().getPlayerExact(args.get(0));
         if (p == null) {
             sender.sendMessage("Could not find player " + ChatColor.GREEN + args.get(0));
             sender.sendMessage("Are they online?");

src/main/java/com/onarandombox/MultiverseCore/commands/ConfirmCommand.java

@@ -33,7 +33,7 @@ public class ConfirmCommand extends MultiverseCommand {
 
     @Override
     public void runCommand(CommandSender sender, List<String> args) {
-        this.plugin.getCommandQueueManager().runQueuedCommand(sender);
+        this.plugin.getCommandHandler().confirmQueuedCommand(sender);
     }
 
 }

src/main/java/com/onarandombox/MultiverseCore/commands/CreateCommand.java

@@ -8,7 +8,12 @@
 package com.onarandombox.MultiverseCore.commands;
 
 import com.onarandombox.MultiverseCore.MultiverseCore;
+import com.onarandombox.MultiverseCore.api.Core;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
+import com.onarandombox.MultiverseCore.commandtools.flag.CoreFlags;
+import com.onarandombox.MultiverseCore.commandtools.flag.FlagGroup;
+import com.onarandombox.MultiverseCore.commandtools.flag.FlagParseFailedException;
+import com.onarandombox.MultiverseCore.commandtools.flag.FlagResult;
 import com.pneumaticraft.commandhandler.CommandHandler;
 import org.bukkit.ChatColor;
 import org.bukkit.World.Environment;
@@ -26,7 +31,16 @@ import java.util.List;
  * Creates a new world and loads it.
  */
 public class CreateCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+
+    private static final FlagGroup FLAG_GROUP = FlagGroup.of(
+            CoreFlags.SEED,
+            CoreFlags.WORLD_TYPE,
+            CoreFlags.GENERATOR,
+            CoreFlags.GENERATE_STRUCTURES,
+            CoreFlags.SPAWN_ADJUST
+    );
+
+    private final MVWorldManager worldManager;
 
     public CreateCommand(MultiverseCore plugin) {
         super(plugin);
@@ -46,44 +60,19 @@ public class CreateCommand extends MultiverseCommand {
         this.addCommandExample("/mv create " + ChatColor.GOLD + "moonworld" + ChatColor.GREEN + " normal" + ChatColor.DARK_AQUA + " -g BukkitFullOfMoon");
         this.worldManager = this.plugin.getMVWorldManager();
     }
-	
-	private String trimWorldName(String userInput) {
-        // Removes relative paths.
-        return userInput.replaceAll("^[./\\\\]+", "");
-    }
-	
+
     @Override
     public void runCommand(CommandSender sender, List<String> args) {
-        String worldName = trimWorldName(args.get(0));
-        File worldFile = new File(this.plugin.getServer().getWorldContainer(), worldName);
+        String worldName = args.get(0);
         String env = args.get(1);
-        String seed = CommandHandler.getFlag("-s", args);
-        String generator = CommandHandler.getFlag("-g", args);
-        boolean allowStructures = true;
-        String structureString = CommandHandler.getFlag("-a", args);
-        if (structureString != null) {
-            allowStructures = Boolean.parseBoolean(structureString);
-        }
-        String typeString = CommandHandler.getFlag("-t", args);
-        boolean useSpawnAdjust = true;
-        for (String s : args) {
-            if (s.equalsIgnoreCase("-n")) {
-                useSpawnAdjust = false;
-            }
-        }
-		
-		// Make sure the world name doesn't contain the words 'plugins' and '.dat'
-		if(worldName.contains("plugins")||worldName.contains(".dat")){
-			sender.sendMessage(ChatColor.RED + "Multiverse cannot create a world that contains 'plugins' or '.dat'");
-            return;
-		}
-		
+
         if (this.worldManager.isMVWorld(worldName)) {
             sender.sendMessage(ChatColor.RED + "Multiverse cannot create " + ChatColor.GOLD + ChatColor.UNDERLINE
                     + "another" + ChatColor.RESET + ChatColor.RED + " world named " + worldName);
             return;
         }
 
+        File worldFile = new File(this.plugin.getServer().getWorldContainer(), worldName);
         if (worldFile.exists()) {
             sender.sendMessage(ChatColor.RED + "A Folder/World already exists with this name!");
             sender.sendMessage(ChatColor.RED + "If you are confident it is a world you can import with /mvimport");
@@ -97,35 +86,28 @@ public class CreateCommand extends MultiverseCommand {
             return;
         }
 
-        // If they didn't specify a type, default to NORMAL
-        if (typeString == null) {
-            typeString = "NORMAL";
-        }
-        WorldType type = EnvironmentCommand.getWorldTypeFromString(typeString);
-        if (type == null) {
-            sender.sendMessage(ChatColor.RED + "That is not a valid World Type.");
-            EnvironmentCommand.showWorldTypes(sender);
+        FlagResult flags;
+        try {
+            flags = FLAG_GROUP.calculateResult(args.subList(2, args.size()).toArray(new String[0]));
+        } catch (FlagParseFailedException e) {
+            sender.sendMessage(String.format("%sError: %s", ChatColor.RED, e.getMessage()));
             return;
         }
-        // Determine if the generator is valid. #918
-        if (generator != null) {
-            List<String> genarray = new ArrayList<String>(Arrays.asList(generator.split(":")));
-            if (genarray.size() < 2) {
-                // If there was only one arg specified, pad with another empty one.
-                genarray.add("");
-            }
-            if (this.worldManager.getChunkGenerator(genarray.get(0), genarray.get(1), "test") == null) {
-                // We have an invalid generator.
-                sender.sendMessage("Invalid generator! '" + generator + "'. " + ChatColor.RED + "Aborting world creation.");
-                return;
-            }
-        }
+
         Command.broadcastCommandMessage(sender, "Starting creation of world '" + worldName + "'...");
 
-        if (this.worldManager.addWorld(worldName, environment, seed, type, allowStructures, generator, useSpawnAdjust)) {
+        if (this.worldManager.addWorld(
+                worldName,
+                environment,
+                flags.getValue(CoreFlags.SEED),
+                flags.getValue(CoreFlags.WORLD_TYPE),
+                flags.getValue(CoreFlags.GENERATE_STRUCTURES),
+                flags.getValue(CoreFlags.GENERATOR),
+                flags.getValue(CoreFlags.SPAWN_ADJUST))) {
+
             Command.broadcastCommandMessage(sender, "Complete!");
-        } else {
-            Command.broadcastCommandMessage(sender, "FAILED.");
+            return;
         }
+        Command.broadcastCommandMessage(sender, "FAILED.");
     }
-}
+}

src/main/java/com/onarandombox/MultiverseCore/commands/DeleteCommand.java

@@ -8,11 +8,9 @@
 package com.onarandombox.MultiverseCore.commands;
 
 import com.onarandombox.MultiverseCore.MultiverseCore;
-import com.onarandombox.MultiverseCore.commandtools.queue.QueuedCommand;
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.permissions.PermissionDefault;
-import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -37,24 +35,11 @@ public class DeleteCommand extends MultiverseCommand {
     public void runCommand(CommandSender sender, List<String> args) {
         String worldName = args.get(0);
 
-        this.plugin.getCommandQueueManager().addToQueue(new QueuedCommand(
-                sender,
-                deleteRunnable(sender, worldName),
-                String.format("Are you sure you want to delete world '%s'? You cannot undo this action.", worldName)
-        ));
-    }
-
-    private Runnable deleteRunnable(@NotNull CommandSender sender,
-                                    @NotNull String worldName) {
-
-        return () -> {
-            sender.sendMessage(String.format("Deleting world '%s'...", worldName));
-            if (this.plugin.getMVWorldManager().deleteWorld(worldName)) {
-                sender.sendMessage(String.format("%sWorld %s was deleted!", ChatColor.GREEN, worldName));
-                return;
-            }
-            sender.sendMessage(String.format("%sThere was an issue deleting '%s'! Please check console for errors.",
-                    ChatColor.RED, worldName));
-        };
+        Class<?>[] paramTypes = {String.class};
+        List<Object> objectArgs = new ArrayList<Object>(args);
+        this.plugin.getCommandHandler()
+                   .queueCommand(sender, "mvdelete", "deleteWorld", objectArgs,
+                                 paramTypes, ChatColor.GREEN + "World '" + worldName + "' Deleted!",
+                                 ChatColor.RED + "World '" + worldName + "' could NOT be deleted!");
     }
 }

src/main/java/com/onarandombox/MultiverseCore/commands/ImportCommand.java

@@ -9,7 +9,7 @@ package com.onarandombox.MultiverseCore.commands;
 
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
-import com.onarandombox.MultiverseCore.utils.WorldNameChecker;
+import com.onarandombox.MultiverseCore.api.MultiverseWorld;
 import com.pneumaticraft.commandhandler.CommandHandler;
 import org.bukkit.ChatColor;
 import org.bukkit.World.Environment;
@@ -18,6 +18,8 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.permissions.PermissionDefault;
 
 import java.io.File;
+import java.io.FilenameFilter;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
@@ -43,17 +45,55 @@ public class ImportCommand extends MultiverseCommand {
         this.worldManager = this.plugin.getMVWorldManager();
     }
 
-    private String getPotentialWorldStrings() {
-        final Collection<String> potentialWorlds = this.worldManager.getPotentialWorlds();
-        StringBuilder worldList = new StringBuilder();
-        ChatColor currColor = ChatColor.WHITE;
-
-        for (String world : potentialWorlds) {
-            worldList.append(currColor).append(world).append(' ');
-            currColor = currColor == ChatColor.WHITE ? ChatColor.YELLOW : ChatColor.WHITE;
+    /**
+     * A very basic check to see if a folder has a level.dat file.
+     * If it does, we can safely assume it's a world folder.
+     *
+     * @param worldFolder The File that may be a world.
+     * @return True if it looks like a world, false if not.
+     */
+    private static boolean checkIfIsWorld(File worldFolder) {
+        if (worldFolder.isDirectory()) {
+            File[] files = worldFolder.listFiles(new FilenameFilter() {
+                @Override
+                public boolean accept(File file, String name) {
+                    return name.toLowerCase().endsWith(".dat");
+                }
+            });
+            if (files != null && files.length > 0) {
+                return true;
+            }
         }
+        return false;
+    }
 
-        return worldList.toString();
+    private String getPotentialWorlds() {
+        File worldFolder = this.plugin.getServer().getWorldContainer();
+        if (worldFolder == null) {
+            return "";
+        }
+        File[] files = worldFolder.listFiles();
+        String worldList = "";
+        Collection<MultiverseWorld> worlds = this.worldManager.getMVWorlds();
+        List<String> worldStrings = new ArrayList<String>();
+        for (MultiverseWorld world : worlds) {
+            worldStrings.add(world.getName());
+        }
+        for (String world : this.worldManager.getUnloadedWorlds()) {
+            worldStrings.add(world);
+        }
+        ChatColor currColor = ChatColor.WHITE;
+        for (File file : files) {
+            if (file.isDirectory() && checkIfIsWorld(file) && !worldStrings.contains(file.getName())) {
+                worldList += currColor + file.getName() + " ";
+                if (currColor == ChatColor.WHITE) {
+                    currColor = ChatColor.YELLOW;
+                } else {
+                    currColor = ChatColor.WHITE;
+                }
+            }
+        }
+        return worldList;
     }
     
     private String trimWorldName(String userInput) {
@@ -66,7 +106,7 @@ public class ImportCommand extends MultiverseCommand {
         String worldName = trimWorldName(args.get(0));
 
         if (worldName.toLowerCase().equals("--list") || worldName.toLowerCase().equals("-l")) {
-            String worldList = this.getPotentialWorldStrings();
+            String worldList = this.getPotentialWorlds();
             if (worldList.length() > 2) {
                 sender.sendMessage(ChatColor.AQUA + "====[ These look like worlds ]====");
                 sender.sendMessage(worldList);
@@ -81,12 +121,6 @@ public class ImportCommand extends MultiverseCommand {
             this.showHelp(sender);
             return;
         }
-		
-		// Make sure the world name doesn't contain the words 'plugins' and '.dat'
-		if(worldName.contains("plugins")||worldName.contains(".dat")){
-			sender.sendMessage(ChatColor.RED + "Multiverse cannot create a world that contains 'plugins' or '.dat'");
-            return;
-		}
 
         // Make sure we don't already know about this world.
         if (this.worldManager.isMVWorld(worldName)) {
@@ -115,10 +149,10 @@ public class ImportCommand extends MultiverseCommand {
 
         if (!worldFile.exists()) {
             sender.sendMessage(ChatColor.RED + "FAILED.");
-            String worldList = this.getPotentialWorldStrings();
+            String worldList = this.getPotentialWorlds();
             sender.sendMessage("That world folder does not exist. These look like worlds to me:");
             sender.sendMessage(worldList);
-        } else if (!WorldNameChecker.isValidWorldFolder(worldFile)) {
+        } else if (!checkIfIsWorld(worldFile)) {
             sender.sendMessage(ChatColor.RED + "FAILED.");
             sender.sendMessage(String.format("'%s' does not appear to be a world. It is lacking a .dat file.",
                                              worldName));
@@ -134,4 +168,4 @@ public class ImportCommand extends MultiverseCommand {
                 Command.broadcastCommandMessage(sender, ChatColor.RED + "Failed!");
         }
     }
-}
+}

src/main/java/com/onarandombox/MultiverseCore/commands/RegenCommand.java

@@ -8,13 +8,11 @@
 package com.onarandombox.MultiverseCore.commands;
 
 import com.onarandombox.MultiverseCore.MultiverseCore;
-import com.onarandombox.MultiverseCore.commandtools.queue.QueuedCommand;
-import com.pneumaticraft.commandhandler.CommandHandler;
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 import org.bukkit.permissions.PermissionDefault;
-import org.jetbrains.annotations.NotNull;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -25,8 +23,8 @@ public class RegenCommand extends MultiverseCommand {
     public RegenCommand(MultiverseCore plugin) {
         super(plugin);
         this.setName("Regenerates a World");
-        this.setCommandUsage("/mv regen" + ChatColor.GREEN + " {WORLD}" + ChatColor.GOLD + " [-s [SEED]] [--keep-gamerules]");
-        this.setArgRange(1, 4);
+        this.setCommandUsage("/mv regen" + ChatColor.GREEN + " {WORLD}" + ChatColor.GOLD + " [-s [SEED]]");
+        this.setArgRange(1, 3);
         this.addKey("mvregen");
         this.addKey("mv regen");
         this.addCommandExample("You can use the -s with no args to get a new seed:");
@@ -39,31 +37,17 @@ public class RegenCommand extends MultiverseCommand {
 
     @Override
     public void runCommand(CommandSender sender, List<String> args) {
-        String worldName = args.get(0);
-        boolean useseed = (!(args.size() == 1));
-        boolean randomseed = (args.size() == 2 && args.get(1).equalsIgnoreCase("-s"));
+        Boolean useseed = (!(args.size() == 1));
+        Boolean randomseed = (args.size() == 2 && args.get(1).equalsIgnoreCase("-s"));
         String seed = (args.size() == 3) ? args.get(2) : "";
-        boolean keepGamerules = CommandHandler.hasFlag("--keep-gamerules", args);
-        this.plugin.getCommandQueueManager().addToQueue(new QueuedCommand(
-                sender,
-                doWorldRegen(sender, worldName, useseed, randomseed, seed, keepGamerules),
-                String.format("Are you sure you want to regen '%s'? You cannot undo this action.", worldName)
-        ));
-    }
 
-    private Runnable doWorldRegen(@NotNull CommandSender sender,
-                                  @NotNull String worldName,
-                                  boolean useSeed,
-                                  boolean randomSeed,
-                                  @NotNull String seed,
-                                  boolean keepGamerules) {
-
-        return () -> {
-            if (this.plugin.getMVWorldManager().regenWorld(worldName, useSeed, randomSeed, seed, keepGamerules)) {
-                sender.sendMessage(ChatColor.GREEN + "World Regenerated!");
-                return;
-            }
-            sender.sendMessage(ChatColor.RED + "World could NOT be regenerated!");
-        };
+        Class<?>[] paramTypes = {String.class, Boolean.class, Boolean.class, String.class};
+        List<Object> objectArgs = new ArrayList<Object>();
+        objectArgs.add(args.get(0));
+        objectArgs.add(useseed);
+        objectArgs.add(randomseed);
+        objectArgs.add(seed);
+        this.plugin.getCommandHandler().queueCommand(sender, "mvregen", "regenWorld", objectArgs,
+                paramTypes, ChatColor.GREEN + "World Regenerated!", ChatColor.RED + "World could NOT be regenerated!");
     }
 }

src/main/java/com/onarandombox/MultiverseCore/commands/SpawnCommand.java

@@ -9,7 +9,6 @@ package com.onarandombox.MultiverseCore.commands;
 
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MultiverseWorld;
-import com.onarandombox.MultiverseCore.utils.PlayerFinder;
 import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.command.CommandSender;
@@ -51,7 +50,7 @@ public class SpawnCommand extends MultiverseCommand {
                 sender.sendMessage("You don't have permission to teleport another player to spawn. (multiverse.core.spawn.other)");
                 return;
             }
-            Player target = PlayerFinder.get(args.get(0), sender);
+            Player target = this.plugin.getServer().getPlayerExact(args.get(0));
             if (target != null) {
                 target.sendMessage("Teleporting to this world's spawn...");
                 spawnAccurately(target);

src/main/java/com/onarandombox/MultiverseCore/commands/TeleportCommand.java

@@ -11,7 +11,6 @@ import com.dumptruckman.minecraft.util.Logging;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.Teleporter;
 import com.onarandombox.MultiverseCore.api.MVDestination;
-import com.onarandombox.MultiverseCore.commandtools.queue.QueuedCommand;
 import com.onarandombox.MultiverseCore.destination.CustomTeleporterDestination;
 import com.onarandombox.MultiverseCore.destination.DestinationFactory;
 import com.onarandombox.MultiverseCore.destination.InvalidDestination;
@@ -19,7 +18,6 @@ import com.onarandombox.MultiverseCore.destination.WorldDestination;
 import com.onarandombox.MultiverseCore.enums.TeleportResult;
 import com.onarandombox.MultiverseCore.event.MVTeleportEvent;
 import com.onarandombox.MultiverseCore.api.SafeTTeleporter;
-import com.onarandombox.MultiverseCore.utils.PlayerFinder;
 import org.bukkit.ChatColor;
 import org.bukkit.Location;
 import org.bukkit.World;
@@ -30,6 +28,7 @@ import org.bukkit.permissions.PermissionDefault;
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Level;
 
 /**
  * Used to teleport players.
@@ -60,7 +59,7 @@ public class TeleportCommand extends MultiverseCommand {
         String destinationName;
 
         if (args.size() == 2) {
-            teleportee = PlayerFinder.get(args.get(0), sender);
+            teleportee = this.plugin.getServer().getPlayerExact(args.get(0));
             if (teleportee == null) {
                 this.messaging.sendMessage(sender, String.format("Sorry, I couldn't find player: %s%s",
                         ChatColor.GOLD, args.get(0)), false);
@@ -76,9 +75,22 @@ public class TeleportCommand extends MultiverseCommand {
             }
             teleportee = (Player) sender;
         }
+        // Special case for cannons:
+        if (destinationName.matches("(?i)cannon-[\\d]+(\\.[\\d]+)?")) {
+            String[] cannonSpeed = destinationName.split("-");
+            try {
+                double speed = Double.parseDouble(cannonSpeed[1]);
+                destinationName = "ca:" + teleportee.getWorld().getName() + ":" + teleportee.getLocation().getX()
+                        + "," + teleportee.getLocation().getY() + "," + teleportee.getLocation().getZ() + ":"
+                        + teleportee.getLocation().getPitch() + ":" + teleportee.getLocation().getYaw() + ":" + speed;
+            } catch (Exception e) {
+                destinationName = "i:invalid";
+            }
 
+        }
         DestinationFactory df = this.plugin.getDestFactory();
-        MVDestination d = df.getPlayerAwareDestination(teleportee, destinationName);
+        MVDestination d = df.getDestination(destinationName);
+
 
         MVTeleportEvent teleportEvent = new MVTeleportEvent(d, teleportee, teleporter, true);
         this.plugin.getServer().getPluginManager().callEvent(teleportEvent);
@@ -153,27 +165,24 @@ public class TeleportCommand extends MultiverseCommand {
         if (result == TeleportResult.FAIL_UNSAFE) {
             Logging.fine("Could not teleport " + teleportee.getName()
                     + " to " + plugin.getLocationManipulation().strCoordsRaw(d.getLocation(teleportee)));
-
+            Logging.fine("Queueing Command");
+            Class<?>[] paramTypes = { CommandSender.class, Player.class, Location.class };
+            List<Object> items = new ArrayList<Object>();
+            items.add(teleporter);
+            items.add(teleportee);
+            items.add(d.getLocation(teleportee));
             String player = "you";
             if (!teleportee.equals(teleporter)) {
                 player = teleportee.getName();
             }
-
-            this.plugin.getCommandQueueManager().addToQueue(new QueuedCommand(
-                    sender,
-                    doUnsafeTeleport(teleporter, teleportee, d.getLocation(teleportee)),
-                    String.format("%sMultiverse %sdid not teleport %s%s %sto %s%s %sbecause it was unsafe. Would you like to try anyway?",
-                            ChatColor.GREEN, ChatColor.WHITE, ChatColor.AQUA, player, ChatColor.WHITE, ChatColor.DARK_AQUA, d.getName(), ChatColor.WHITE),
-                    UNSAFE_TELEPORT_EXPIRE_DELAY
-            ));
+            String message = String.format("%sMultiverse %sdid not teleport %s%s %sto %s%s %sbecause it was unsafe.",
+                    ChatColor.GREEN, ChatColor.WHITE, ChatColor.AQUA, player, ChatColor.WHITE, ChatColor.DARK_AQUA, d.getName(), ChatColor.WHITE);
+            this.plugin.getCommandHandler().queueCommand(sender, "mvteleport", "teleportPlayer", items,
+                    paramTypes, message, "Would you like to try anyway?", "", "", UNSAFE_TELEPORT_EXPIRE_DELAY);
         }
         // else: Player was teleported successfully (or the tp event was fired I should say)
     }
 
-    private Runnable doUnsafeTeleport(CommandSender teleporter, Player player, Location location) {
-        return () -> this.plugin.getSafeTTeleporter().safelyTeleport(teleporter, player, location, false);
-    }
-
     private boolean checkSendPermissions(CommandSender teleporter, Player teleportee, MVDestination destination) {
         if (teleporter.equals(teleportee)) {
             if (!this.plugin.getMVPerms().hasPermission(teleporter, "multiverse.teleport.self." + destination.getIdentifier(), true)) {

src/main/java/com/onarandombox/MultiverseCore/commands/VersionCommand.java

@@ -45,11 +45,8 @@ public class VersionCommand extends MultiverseCommand {
         this.addKey("mvver");
         this.addKey("mvv");
         this.addKey("mvversion");
-        this.setPermission(
-                "multiverse.core.version",
-                "Dumps version info to the console, optionally to pastebin.com with -b, to hastebin.com using -h, or to paste.gg with -p.",
-                PermissionDefault.OP)
-        ;
+        this.setPermission("multiverse.core.version",
+                "Dumps version info to the console, optionally to pastebin.com with -b, to hastebin.com using -h, or to paste.gg with -p.", PermissionDefault.TRUE);
     }
 
     private String getLegacyString() {

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/CommandFlag.java

@@ -0,0 +1,136 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+
+/**
+ * <p>Represents a flag that can be used in commands. This works as a key value pair.</p>
+ *
+ * <p>Key is the {@link #identifier} and {@link #aliases} set.</p>
+ * <p>Value is the {@link T} parsed based on 3 scenarios during command input:</p>
+ * <ol>
+ *     <li>Flag completely not present. {@link #getDefaultValue()}</li>
+ *     <li>Flag key present but no value. {@link #getValue()}</li>
+ *     <li>Flag key and value present. {@link #getValue(String)}</li>
+ * </ol>
+ *
+ * @param <T>   The flag Type.
+ */
+public abstract class CommandFlag<T> {
+
+    protected final String name;
+    protected final String identifier;
+    protected final Class<T> type;
+    protected final Collection<String> aliases;
+
+    /**
+     * @param name          Readable name for the flag.
+     * @param identifier    Unique key to identify the flag in command arguments.
+     * @param type          The type of value this flag represents.
+     */
+    protected CommandFlag(@NotNull String name,
+                          @NotNull String identifier,
+                          @NotNull Class<T> type) {
+
+        this.name = name;
+        this.identifier = identifier;
+        this.type = type;
+        this.aliases = new ArrayList<>();
+    }
+
+    /**
+     * Gets name of the Command Flag.
+     *
+     * @return The Command Flag name.
+     */
+    @NotNull
+    public String getName() {
+        return this.name;
+    }
+
+    /**
+     * Gets identifier of the Command Flag.
+     *
+     * @return The Command Flag identifier.
+     */
+    @NotNull
+    public String getIdentifier() {
+        return this.identifier;
+    }
+
+    /**
+     * Gets {@link T} Type of the Command Flag.
+     *
+     * @return The Command Flag type.
+     */
+    @NotNull
+    public Class<T> getType() {
+        return this.type;
+    }
+
+    /**
+     * Gets all the alternative key identifiers set for this Command Flag.
+     *
+     * @return Collection of aliases.
+     */
+    @NotNull
+    public Collection<String> getAliases() {
+        return this.aliases;
+    }
+
+    /**
+     * Add alternative key identifiers for this Command Flag.
+     *
+     * @param aliases   Alias(es) to be added.
+     * @return A {@link CommandFlag}.
+     */
+    public CommandFlag<T> addAliases(String...aliases) {
+        Collections.addAll(this.aliases, aliases);
+        return this;
+    }
+
+    /**
+     * Tab-complete suggestion for this Command Flag values.
+     *
+     * @return Collection of suggested values available.
+     */
+    public abstract Collection<String> suggestValue();
+
+    /**
+     * When this Command Flag can get value by a user input.
+     *
+     * @return The {@link T} value.
+     */
+    public abstract T getValue(@NotNull String input) throws FlagParseFailedException;
+
+    /**
+     * When this Command Flag user input value is null/not present.
+     *
+     * @return The {@link T} value.
+     */
+    public T getValue() throws FlagParseFailedException {
+        return null;
+    }
+
+    /**
+     * When this Command Flag is not present in command input.
+     *
+     * @return The {@link T} value.
+     */
+    public T getDefaultValue() {
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return "CommandFlag{" +
+                "name='" + name + '\'' +
+                ", identifier='" + identifier + '\'' +
+                ", type=" + type +
+                ", aliases=" + aliases +
+                '}';
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/CoreFlags.java

@@ -0,0 +1,217 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+import com.onarandombox.MultiverseCore.MultiverseCore;
+import com.onarandombox.MultiverseCore.utils.webpaste.PasteServiceType;
+import org.bukkit.Bukkit;
+import org.bukkit.WorldType;
+import org.bukkit.plugin.Plugin;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+import java.util.stream.Collectors;
+
+public class CoreFlags {
+
+    private static MultiverseCore multiverse;
+
+    public static void setCoreInstance(MultiverseCore plugin) {
+        multiverse = plugin;
+    }
+
+    /**
+     * Flag for custom seed.
+     */
+    public static final CommandFlag<String> SEED = new RequiredCommandFlag<String>
+            ("Seed", "--seed", String.class) {
+        @Override
+        public Collection<String> suggestValue() {
+            return Collections.singleton(String.valueOf(new Random().nextLong()));
+        }
+
+        @Override
+        public String getValue(@NotNull String input) throws FlagParseFailedException {
+            return input;
+        }
+    }.addAliases("-s");
+
+    /**
+     * Flag for custom seed. No value means random seed.
+     */
+    public static final CommandFlag<String> RANDOM_SEED = new OptionalCommandFlag<String>
+            ("Seed", "--seed", String.class) {
+        @Override
+        public Collection<String> suggestValue() {
+            return Collections.singletonList(String.valueOf(new Random().nextLong()));
+        }
+
+        @Override
+        public String getValue(@NotNull String input) throws FlagParseFailedException {
+            return input;
+        }
+    }.addAliases("-s");
+
+    /**
+     * Flag for world type used.
+     */
+    public static final CommandFlag<WorldType> WORLD_TYPE = new RequiredCommandFlag<WorldType>
+            ("WorldType", "--type", WorldType.class) {
+
+        private final Map<String, String> typeAlias = new HashMap<String, String>(4){{
+            put("normal", "NORMAL");
+            put("flat", "FLAT");
+            put("largebiomes", "LARGE_BIOMES");
+            put("amplified", "AMPLIFIED");
+        }};
+
+        @Override
+        public Collection<String> suggestValue() {
+            return typeAlias.keySet();
+        }
+
+        @Override
+        public WorldType getValue(@NotNull String input) throws FlagParseFailedException {
+            String typeName = typeAlias.getOrDefault(input, input);
+            try {
+                return WorldType.valueOf(input.toUpperCase());
+            }
+            catch (IllegalArgumentException e) {
+                throw new FlagParseFailedException("'%s' is not a valid World Type. See /mv env for available World Types.", input);
+            }
+        }
+
+        @Override
+        public WorldType getDefaultValue() {
+            return WorldType.NORMAL;
+        }
+    }.addAliases("-t");
+
+    /**
+     * Flag for world generator.
+     */
+    public static final CommandFlag<String> GENERATOR = new RequiredCommandFlag<String>
+            ("Generator", "--gen", String.class) {
+        @Override
+        public Collection<String> suggestValue() {
+            return Arrays.stream(Bukkit.getServer().getPluginManager().getPlugins())
+                    .filter(Plugin::isEnabled)
+                    .filter(plugin -> multiverse.getUnsafeCallWrapper().wrap(
+                            () -> plugin.getDefaultWorldGenerator("world", ""),
+                            plugin.getName(),
+                            "Get generator"
+                    ) != null)
+                    .map(plugin -> plugin.getDescription().getName())
+                    .collect(Collectors.toList());
+        }
+
+        @Override
+        public String getValue(@NotNull String input) throws FlagParseFailedException {
+            String[] genArray = input.split(":");
+            String generator = genArray[0];
+            String generatorId = (genArray.length > 1) ? genArray[1] : "";
+            try {
+                if (multiverse.getMVWorldManager().getChunkGenerator(generator, generatorId, "test") == null) {
+                    throw new Exception();
+                }
+            } catch (Exception e) {
+                throw new FlagParseFailedException("Invalid generator string '%s'. See /mv gens for available generators.", input);
+            }
+            return input;
+        }
+    }.addAliases("-g");
+
+    /**
+     * Flag to toggle if world should generate structures.
+     */
+    public static final CommandFlag<Boolean> GENERATE_STRUCTURES = new RequiredCommandFlag<Boolean>
+            ("GenerateStructures", "--structures", Boolean.class) {
+        @Override
+        public Collection<String> suggestValue() {
+            return Arrays.asList("true", "false");
+        }
+
+        @Override
+        public Boolean getValue(@NotNull String input) throws FlagParseFailedException {
+            return input.equalsIgnoreCase("true");
+        }
+
+        @Override
+        public Boolean getDefaultValue() {
+            return true;
+        }
+    }.addAliases("--structure", "-a");
+
+    /**
+     * Flag to toggle if world spawn should be adjusted.
+     */
+    public static final CommandFlag<Boolean> SPAWN_ADJUST = new NoValueCommandFlag<Boolean>
+            ("AdjustSpawn", "--dont-adjust-spawn", Boolean.class) {
+        @Override
+        public Boolean getValue() throws FlagParseFailedException {
+            return false;
+        }
+
+        @Override
+        public Boolean getDefaultValue() {
+            return true;
+        }
+    }.addAliases("-n");
+
+    /**
+     * Flag to specify a paste service.
+     */
+    public static final CommandFlag<PasteServiceType> PASTE_SERVICE_TYPE = new OptionalCommandFlag<PasteServiceType>
+            ("PasteServiceType", "--paste", PasteServiceType.class) {
+
+        private final List<String> pasteTypes = Arrays.stream(PasteServiceType.values())
+                .filter(pt -> pt != PasteServiceType.NONE)
+                .map(p -> p.toString().toLowerCase())
+                .collect(Collectors.toList());
+
+        @Override
+        public Collection<String> suggestValue() {
+            return pasteTypes;
+        }
+
+        @Override
+        public PasteServiceType getValue(@NotNull String input) throws FlagParseFailedException {
+            try {
+                return PasteServiceType.valueOf(input.toUpperCase());
+            }
+            catch (IllegalArgumentException e) {
+                throw new FlagParseFailedException(String.format("Invalid paste service type '%s'.", input));
+            }
+        }
+
+        @Override
+        public PasteServiceType getValue() throws FlagParseFailedException {
+            return PasteServiceType.PASTEGG;
+        }
+
+        @Override
+        public PasteServiceType getDefaultValue() {
+            return PasteServiceType.NONE;
+        }
+    }.addAliases("-p");
+
+    /**
+     * Flag to toggle if plugin list should be included.
+     */
+    public static final CommandFlag<Boolean> INCLUDE_PLUGIN_LIST = new NoValueCommandFlag<Boolean>
+            ("IncludePlugins", "--include-plugin-list", Boolean.class) {
+        @Override
+        public Boolean getValue() throws FlagParseFailedException {
+            return true;
+        }
+
+        @Override
+        public Boolean getDefaultValue() {
+            return true;
+        }
+    }.addAliases("-pl");
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/FlagGroup.java

@@ -0,0 +1,96 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A group of {@link CommandFlag}, with indexed keys for efficient lookup.
+ */
+public class FlagGroup {
+
+    /**
+     * Create a new Flag Group with multiple {@link CommandFlag}.
+     *
+     * @param flags Multiple flags.
+     * @return A new {@link FlagGroup} generated from the flags.
+     */
+    public static FlagGroup of(CommandFlag<?>...flags) {
+        return new FlagGroup(flags);
+    }
+
+    private final List<String> identifiers;
+    private final Map<String, CommandFlag<?>> keyMap;
+
+    /**
+     * Create a new Flag Group with multiple {@link CommandFlag}.
+     *
+     * @param commandFlags Array of flags
+     */
+    public FlagGroup(CommandFlag<?>[] commandFlags) {
+        this.identifiers = new ArrayList<>(commandFlags.length);
+        this.keyMap = new HashMap<>();
+        for (CommandFlag<?> flag : commandFlags) {
+            addFlag(flag);
+        }
+    }
+
+    /**
+     * Add and indexes a flag.
+     *
+     * @param flag  The flag to add.
+     */
+    private void addFlag(CommandFlag<?> flag) {
+        this.identifiers.add(flag.getIdentifier());
+        this.keyMap.put(flag.getIdentifier(), flag);
+        for (String flagAlias : flag.getAliases()) {
+            this.keyMap.put(flagAlias, flag);
+        }
+    }
+
+    /**
+     * Parse the arguments to get it's flag values.
+     *
+     * @param args  The arguments to parse.
+     * @return A {@link FlagResult} containing value results.
+     * @throws FlagParseFailedException When there is an error parsing, such as invalid format.
+     */
+    @NotNull
+    public FlagResult calculateResult(String[] args) throws FlagParseFailedException {
+        return FlagResult.parse(args,this);
+    }
+
+    /**
+     * Gets flag from pre-indexed key mapping.
+     *
+     * @param key   The target key.
+     * @return A {@link CommandFlag} if found, else null.
+     */
+    @Nullable
+    public CommandFlag<?> getByKey(String key) {
+        return this.keyMap.get(key);
+    }
+
+    /**
+     * Suggest possible identifiers available for this Flag Group.
+     *
+     * @return A collection of identifier strings.
+     */
+    @NotNull
+    public Collection<String> suggestIdentifiers() {
+        return identifiers;
+    }
+
+    @Override
+    public String toString() {
+        return "FlagGroup{" +
+                "flagIdentifiers=" + identifiers +
+                ", keyFlagMap=" + keyMap +
+                '}';
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/FlagParseFailedException.java

@@ -0,0 +1,27 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+/**
+ * Thrown when there is an issue with parsing flags from string arguments.
+ */
+//TODO: extend this from ACF CommandArgumentFailed exception class.
+public class FlagParseFailedException extends Exception {
+
+    public FlagParseFailedException() {
+    }
+
+    public FlagParseFailedException(String message, Object...replacements) {
+        super(String.format(message, replacements));
+    }
+
+    public FlagParseFailedException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public FlagParseFailedException(Throwable cause) {
+        super(cause);
+    }
+
+    public FlagParseFailedException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+        super(message, cause, enableSuppression, writableStackTrace);
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/FlagResult.java

@@ -0,0 +1,198 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Represents the value result parsed from command arguments.
+ */
+public class FlagResult {
+
+    /**
+     * Parse arguments into its flag key and values.
+     *
+     * @param args      The arguments to parse.
+     * @param flagGroup The flags available to parse into.
+     * @return The {@link FlagResult} from the parse.
+     * @throws FlagParseFailedException there is an issue with parsing flags from string arguments.
+     */
+    public static FlagResult parse(@Nullable String[] args,
+                                   @NotNull FlagGroup flagGroup) throws FlagParseFailedException {
+
+        FlagResult flagResult = new FlagResult();
+
+        // No args to parse.
+        if (args == null || args.length <= 0) {
+            return flagResult;
+        }
+
+        // First arg must be a flag.
+        CommandFlag<?> currentFlag = flagGroup.getByKey(args[0]);
+        boolean completed = false;
+
+        // Parse the arguments.
+        for (int i = 1, argsLength = args.length; i <= argsLength; i++) {
+            if (currentFlag == null) {
+                throw new FlagParseFailedException("%s is not a valid flag.", args[i-1]);
+            }
+            // This ensures that flag is not null during final parse.
+            if (i >= argsLength) {
+                break;
+            }
+
+            String arg = args[i];
+            if (arg == null) {
+                throw new FlagParseFailedException("Arguments cannot be null!");
+            }
+
+            CommandFlag<?> nextFlag = flagGroup.getByKey(arg);
+
+            // Arg must be a flag key.
+            if (currentFlag instanceof NoValueCommandFlag) {
+                flagResult.add(currentFlag, currentFlag.getValue(), false);
+                currentFlag = nextFlag;
+                continue;
+            }
+
+            // Arg can be a flag key or value.
+            if (currentFlag instanceof OptionalCommandFlag) {
+                if (nextFlag != null) {
+                    // It's a key.
+                    flagResult.add(currentFlag, currentFlag.getValue(), false);
+                    currentFlag = nextFlag;
+                    continue;
+                }
+                // It's a value.
+                flagResult.add(currentFlag, currentFlag.getValue(arg), true);
+                if (i == argsLength - 1) {
+                    completed = true;
+                    break;
+                }
+                currentFlag = flagGroup.getByKey(args[++i]);
+                continue;
+            }
+
+            // Arg must be a flag value.
+            if (currentFlag instanceof RequiredCommandFlag) {
+                if (nextFlag != null) {
+                    // It's a key, error!
+                    throw new FlagParseFailedException("%s flag '%s' requires a value input.",
+                            currentFlag.getName(), currentFlag.getIdentifier());
+                }
+                // It's a value.
+                flagResult.add(currentFlag, currentFlag.getValue(arg), true);
+                if (i == argsLength - 1) {
+                    completed = true;
+                    break;
+                }
+                currentFlag = flagGroup.getByKey(args[++i]);
+            }
+        }
+
+        // Parse last flag.
+        if (!completed) {
+            if (currentFlag instanceof RequiredCommandFlag) {
+                throw new FlagParseFailedException("%s flag '%s' requires a value input.",
+                        currentFlag.getName(), currentFlag.getIdentifier());
+            }
+            flagResult.add(currentFlag, currentFlag.getValue(), false);
+        }
+
+        return flagResult;
+    }
+
+    private final Map<CommandFlag<?>, SingleFlagResult<?>> resultMap;
+
+    private FlagResult() {
+        resultMap = new HashMap<>();
+    }
+
+    /**
+     * Add a new value result from parsing arguments.
+     *
+     * @param flag      The flag that the value represents.
+     * @param value     The value of the flag.
+     * @param fromInput Denotes if flag was parsed by a user input.
+     */
+    private void add(CommandFlag<?> flag, Object value, boolean fromInput) {
+        resultMap.put(flag, new SingleFlagResult<>(value, fromInput));
+    }
+
+    /**
+     * Gets value of a flag.
+     *
+     * @param flag  The flag to get value from.
+     * @param <T>   The type of value.
+     * @return The value which is associated with the flag.
+     */
+    public <T> T getValue(CommandFlag<T> flag) {
+        SingleFlagResult<?> result = resultMap.get(flag);
+        if (result == null) {
+            return flag.getDefaultValue();
+        }
+        return (T) result.value;
+    }
+
+    /**
+     * Gets if the flag value is by a user input.
+     *
+     * @param flag  The flag to check against.
+     * @return True if value is by user input, else false.
+     */
+    public boolean isByUserInput(CommandFlag<?> flag) {
+        SingleFlagResult<?> result = resultMap.get(flag);
+        if (result == null) {
+            return false;
+        }
+        return result.isFromUserInput;
+    }
+
+    /**
+     * Gets if the flag is a default value, and key was not present in user's command arguments.
+     * i.e. Not in the {@link #resultMap}.
+     *
+     * @param flag  The flag to check against.
+     * @return True if flag was not present in user's command arguments, else false.
+     */
+    public boolean isDefaulted(CommandFlag<?> flag) {
+        return resultMap.get(flag) != null;
+    }
+
+    @Override
+    public String toString() {
+        return "FlagResult{" +
+                "resultMap=" + resultMap +
+                '}';
+    }
+
+    /**
+     * Represents a single value result parsed.
+     * Stores value and addition data such as if value is by user input.
+     *
+     * @param <T>   The type of value.
+     */
+    private static class SingleFlagResult<T> {
+        private final T value;
+        private final boolean isFromUserInput;
+
+        /**
+         * @param value     The resultant value from argument parsing.
+         * @param fromInput Indicates if value is parsed by user input.
+         */
+        private SingleFlagResult(T value, boolean fromInput) {
+            this.value = value;
+            this.isFromUserInput = fromInput;
+        }
+
+        @Override
+        public String toString() {
+            return "SingleFlagResult{" +
+                    "value=" + value +
+                    ", isFromUserInput=" + isFromUserInput +
+                    '}';
+        }
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/NoValueCommandFlag.java

@@ -0,0 +1,39 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+import java.util.Collections;
+
+/**
+ * This flag will always not require a user input to parse value.
+ *
+ * @param <T>   The flag Type.
+ */
+public abstract class NoValueCommandFlag<T> extends CommandFlag<T> {
+
+    /**
+     * {@inheritDoc}
+     */
+    public NoValueCommandFlag(String name, String identifier, Class<T> type) {
+        super(name, identifier, type);
+    }
+
+    /**
+     * {@link NoValueCommandFlag} will always not require a user input to parse value.
+     * Thus, no value suggestion needed.
+     */
+    @Override
+    public final Collection<String> suggestValue() {
+        return Collections.emptyList();
+    }
+
+    /**
+     * {@link NoValueCommandFlag} will always not require a user input to parse value.
+     * Thus, this operation is not allowed.
+     */
+    @Override
+    public final T getValue(@NotNull String input) throws FlagParseFailedException {
+        throw new FlagParseFailedException("%s flag '%s' does not require a value.", this.name, this.identifier);
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/OptionalCommandFlag.java

@@ -0,0 +1,16 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+/**
+ * Command Flag that optionally allows a user input value.
+ *
+ * @param <T>   The flag Type.
+ */
+public abstract class OptionalCommandFlag<T> extends CommandFlag<T> {
+
+    /**
+     * {@inheritDoc}
+     */
+    public OptionalCommandFlag(String name, String identifier, Class<T> type) {
+        super(name, identifier, type);
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/flag/RequiredCommandFlag.java

@@ -0,0 +1,25 @@
+package com.onarandombox.MultiverseCore.commandtools.flag;
+
+/**
+ * This flag will always require a user input to parse value.
+ *
+ * @param <T>   The flag Type.
+ */
+public abstract class RequiredCommandFlag<T> extends CommandFlag<T> {
+
+    /**
+     * {@inheritDoc}
+     */
+    public RequiredCommandFlag(String name, String identifier, Class<T> type) {
+        super(name, identifier, type);
+    }
+
+    /**
+     * {@link RequiredCommandFlag} will always require a user input to parse value.
+     * Thus, this operation is not allowed.
+     */
+    @Override
+    public final T getValue() throws FlagParseFailedException {
+        throw new FlagParseFailedException("%s flag '%s' requires a value input.", this.name, this.identifier);
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/commandtools/queue/CommandQueueManager.java

@@ -1,161 +0,0 @@
-/******************************************************************************
- * Multiverse 2 Copyright (c) the Multiverse Team 2020.                       *
- * Multiverse 2 is licensed under the BSD License.                            *
- * For more information please check the README.md file included              *
- * with this project.                                                         *
- ******************************************************************************/
-
-package com.onarandombox.MultiverseCore.commandtools.queue;
-
-import com.dumptruckman.minecraft.util.Logging;
-import com.onarandombox.MultiverseCore.MultiverseCore;
-import org.bukkit.Bukkit;
-import org.bukkit.ChatColor;
-import org.bukkit.block.data.type.CommandBlock;
-import org.bukkit.command.BlockCommandSender;
-import org.bukkit.command.CommandSender;
-import org.bukkit.scheduler.BukkitTask;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.Map;
-import java.util.WeakHashMap;
-
-/**
- * <p>Manages the queuing of dangerous commands that require {@code /mv confirm} before executing.</p>
- *
- * <p>Each sender can only have one command in queue at any given time. When a queued command is added
- * for a sender that already has a command in queue, it will replace the old queued command.</p>
- */
-public class CommandQueueManager {
-
-    private static final long TICKS_PER_SECOND = 20;
-    private static final DummyCommandBlockSender COMMAND_BLOCK = new DummyCommandBlockSender();
-
-    private final MultiverseCore plugin;
-    private final Map<CommandSender, QueuedCommand> queuedCommandMap;
-
-    public CommandQueueManager(@NotNull MultiverseCore plugin) {
-        this.plugin = plugin;
-        this.queuedCommandMap = new WeakHashMap<>();
-    }
-
-    /**
-     * Adds a {@link QueuedCommand} into queue.
-     *
-     * @param queuedCommand The queued command to add.
-     */
-    public void addToQueue(QueuedCommand queuedCommand) {
-        CommandSender targetSender = parseSender(queuedCommand.getSender());
-
-        // Since only one command is stored in queue per sender, we remove the old one.
-        this.removeFromQueue(targetSender);
-
-        Logging.finer("Add new command to queue for sender %s.", targetSender);
-        this.queuedCommandMap.put(targetSender, queuedCommand);
-        queuedCommand.setExpireTask(runExpireLater(queuedCommand));
-
-        queuedCommand.getSender().sendMessage(queuedCommand.getPrompt());
-        queuedCommand.getSender().sendMessage(String.format("Run %s/mv confirm %sto continue. This will expire in %s seconds.",
-                ChatColor.GREEN, ChatColor.WHITE, queuedCommand.getValidDuration()));
-    }
-
-    /**
-     * Expire task that removes a {@link QueuedCommand} from queue after valid duration defined.
-     *
-     * @param queuedCommand Command to run the expire task on.
-     * @return The expire {@link BukkitTask}.
-     */
-    @NotNull
-    private BukkitTask runExpireLater(@NotNull QueuedCommand queuedCommand) {
-        return Bukkit.getScheduler().runTaskLater(
-                this.plugin,
-                expireRunnable(queuedCommand),
-                queuedCommand.getValidDuration() * TICKS_PER_SECOND
-        );
-    }
-
-    /**
-     * Runnable responsible for expiring the queued command.
-     *
-     * @param queuedCommand Command to create the expire task on.
-     * @return The expire runnable.
-     */
-    @NotNull
-    private Runnable expireRunnable(@NotNull QueuedCommand queuedCommand) {
-        return () -> {
-            CommandSender targetSender = parseSender(queuedCommand.getSender());
-            QueuedCommand matchingQueuedCommand = this.queuedCommandMap.get(targetSender);
-            if (!queuedCommand.equals(matchingQueuedCommand) || queuedCommand.getExpireTask().isCancelled()) {
-                // To be safe, but this shouldn't happen since we cancel old commands before add new once.
-                Logging.finer("This is an old queue command already.");
-                return;
-            }
-            queuedCommand.getSender().sendMessage("Your queued command has expired.");
-            this.queuedCommandMap.remove(queuedCommand.getSender());
-        };
-    }
-
-    /**
-     * Runs the command in queue for the given sender, if any.
-     *
-     * @param sender    {@link CommandSender} that confirmed the command.
-     * @return True if queued command ran successfully, else false.
-     */
-    public boolean runQueuedCommand(@NotNull CommandSender sender) {
-        CommandSender targetSender = parseSender(sender);
-        QueuedCommand queuedCommand = this.queuedCommandMap.get(targetSender);
-        if (queuedCommand == null) {
-            sender.sendMessage(ChatColor.RED + "You do not have any commands in queue.");
-            return false;
-        }
-        Logging.finer("Running queued command...");
-        queuedCommand.getAction().run();
-        return removeFromQueue(targetSender);
-    }
-
-    /**
-     * Since only one command is stored in queue per sender, we remove the old one.
-     *
-     * @param sender    The {@link CommandSender} that executed the command.
-     * @return True if queue command is removed from sender successfully, else false.
-     */
-    public boolean removeFromQueue(@NotNull CommandSender sender) {
-        CommandSender targetSender = parseSender(sender);
-        QueuedCommand previousCommand = this.queuedCommandMap.remove(targetSender);
-        if (previousCommand == null) {
-            Logging.finer("No queue command to remove for sender %s.", targetSender.getName());
-            return false;
-        }
-        previousCommand.getExpireTask().cancel();
-        Logging.finer("Removed queue command for sender %s.", targetSender.getName());
-        return true;
-    }
-
-    /**
-     * To allow all CommandBlocks to be a common sender with use of {@link DummyCommandBlockSender}.
-     * So confirm command can be used for a queued command on another command block.
-     *
-     * @param sender    The sender to parse.
-     * @return The sender, or if its a command block, a {@link DummyCommandBlockSender}.
-     */
-    @NotNull
-    private CommandSender parseSender(@NotNull CommandSender sender) {
-        Logging.fine(sender.getClass().getName());
-        if (isCommandBlock(sender)) {
-            Logging.finer("Is command block.");
-            return COMMAND_BLOCK;
-        }
-        return sender;
-    }
-
-    /**
-     * Checks if the sender is a command block.
-     *
-     * @param sender    The sender to check.
-     * @return True if sender is a command block, else false.
-     */
-    private boolean isCommandBlock(@NotNull CommandSender sender) {
-        return sender instanceof BlockCommandSender
-                && ((BlockCommandSender) sender).getBlock().getBlockData() instanceof CommandBlock;
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/commandtools/queue/DummyCommandBlockSender.java

@@ -1,104 +0,0 @@
-package com.onarandombox.MultiverseCore.commandtools.queue;
-
-import org.bukkit.Bukkit;
-import org.bukkit.Server;
-import org.bukkit.command.CommandSender;
-import org.bukkit.permissions.Permission;
-import org.bukkit.permissions.PermissionAttachment;
-import org.bukkit.permissions.PermissionAttachmentInfo;
-import org.bukkit.plugin.Plugin;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.Set;
-
-/**
- * Used by {@link CommandQueueManager}, so different commands block can be recognised as one.
- */
-class DummyCommandBlockSender implements CommandSender {
-
-    @Override
-    public void sendMessage(@NotNull String message) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void sendMessage(@NotNull String[] messages) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @NotNull Server getServer() {
-        return Bukkit.getServer();
-    }
-
-    @Override
-    public @NotNull String getName() {
-        return "DummyCommandBlockSender";
-    }
-
-    @Override
-    public boolean isPermissionSet(@NotNull String name) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean isPermissionSet(@NotNull Permission perm) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean hasPermission(@NotNull String name) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean hasPermission(@NotNull Permission perm) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @NotNull PermissionAttachment addAttachment(@NotNull Plugin plugin, @NotNull String name, boolean value) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @NotNull PermissionAttachment addAttachment(@NotNull Plugin plugin) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @Nullable PermissionAttachment addAttachment(@NotNull Plugin plugin, @NotNull String name, boolean value, int ticks) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @Nullable PermissionAttachment addAttachment(@NotNull Plugin plugin, int ticks) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void removeAttachment(@NotNull PermissionAttachment attachment) {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void recalculatePermissions() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public @NotNull Set<PermissionAttachmentInfo> getEffectivePermissions() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public boolean isOp() {
-        throw new UnsupportedOperationException();
-    }
-
-    @Override
-    public void setOp(boolean value) {
-        throw new UnsupportedOperationException();
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/commandtools/queue/QueuedCommand.java

@@ -1,86 +0,0 @@
-/******************************************************************************
- * Multiverse 2 Copyright (c) the Multiverse Team 2020.                       *
- * Multiverse 2 is licensed under the BSD License.                            *
- * For more information please check the README.md file included              *
- * with this project.                                                         *
- ******************************************************************************/
-
-package com.onarandombox.MultiverseCore.commandtools.queue;
-
-import org.bukkit.command.CommandSender;
-import org.bukkit.scheduler.BukkitTask;
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Represents a single command used in {@link CommandQueueManager} for confirming before running potentially
- * dangerous action.
- */
-public class QueuedCommand {
-
-    private static final String DEFAULT_PROMPT_MESSAGE = "The command you are trying to run is deemed dangerous.";
-    private static final int DEFAULT_VALID_TIME = 10;
-
-    private final CommandSender sender;
-    private final Runnable action;
-    private final String prompt;
-    private final int validDuration;
-    private BukkitTask expireTask;
-
-    public QueuedCommand(CommandSender sender, Runnable action) {
-        this(sender, action, DEFAULT_PROMPT_MESSAGE, DEFAULT_VALID_TIME);
-    }
-
-    public QueuedCommand(CommandSender sender, Runnable action, String prompt) {
-        this(sender, action, prompt, DEFAULT_VALID_TIME);
-    }
-
-    public QueuedCommand(CommandSender sender, Runnable action, int validDuration) {
-        this(sender, action, DEFAULT_PROMPT_MESSAGE, validDuration);
-    }
-
-    /**
-     * Creates a new queue command, to be registered at {@link CommandQueueManager#addToQueue(QueuedCommand)}.
-     *
-     * @param sender        The sender that ran the command needed for confirmation.
-     * @param action        The logic to execute upon confirming.
-     * @param prompt        Question to ask sender to confirm.
-     * @param validDuration Duration in which the command is valid for confirm in seconds.
-     */
-    public QueuedCommand(CommandSender sender, Runnable action, String prompt, int validDuration) {
-        this.sender = sender;
-        this.action = action;
-        this.prompt = prompt;
-        this.validDuration = validDuration;
-    }
-
-    @NotNull
-    CommandSender getSender() {
-        return sender;
-    }
-
-    @NotNull
-    String getPrompt() {
-        return prompt;
-    }
-
-    int getValidDuration() {
-        return validDuration;
-    }
-
-    @NotNull
-    Runnable getAction() {
-        return action;
-    }
-
-    @NotNull
-    BukkitTask getExpireTask() {
-        return expireTask;
-    }
-
-    void setExpireTask(@NotNull BukkitTask expireTask) {
-        if (this.expireTask != null) {
-            throw new IllegalStateException("This queue command already has an expire task. You can't register twice!");
-        }
-        this.expireTask = expireTask;
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/commandtools/queue/package-info.java

@@ -1,4 +0,0 @@
-/**
- * Manager queuing of dangerous commands in need of confirmation.
- */
-package com.onarandombox.MultiverseCore.commandtools.queue;

src/main/java/com/onarandombox/MultiverseCore/destination/DestinationFactory.java

@@ -11,29 +11,16 @@ import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVDestination;
 import com.onarandombox.MultiverseCore.commands.TeleportCommand;
 import com.onarandombox.MultiverseCore.utils.PermissionTools;
-import com.onarandombox.MultiverseCore.utils.PlayerFinder;
 import com.pneumaticraft.commandhandler.Command;
-import org.bukkit.Bukkit;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
 import org.bukkit.permissions.Permission;
 import org.bukkit.permissions.PermissionDefault;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
-import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.regex.Pattern;
 
-/**
- * A factory class that will create destinations from specific strings.
- */
+/** A factory class that will create destinations from specific strings. */
 public class DestinationFactory {
-
-    private static final Pattern CANNON_PATTERN = Pattern.compile("(?i)cannon-[\\d]+(\\.[\\d]+)?");
-
     private MultiverseCore plugin;
     private Map<String, Class<? extends MVDestination>> destList;
     private Command teleportCommand;
@@ -49,59 +36,6 @@ public class DestinationFactory {
         }
     }
 
-    /**
-     * Parse a destination that has relation to sender, such as a cannon or player destination.
-     *
-     * @param teleportee        The player that is going to be teleported.
-     * @param destinationName   The destination to parse.
-     * @return A non-null MVDestination
-     */
-    @NotNull
-    public MVDestination getPlayerAwareDestination(@NotNull Player teleportee,
-                                                   @NotNull String destinationName) {
-
-        // Prioritise world, in the event that a world is named after a player online.
-        if (Bukkit.getWorld(destinationName) != null) {
-            return getDestination(destinationName);
-        }
-
-        Player targetPlayer = PlayerFinder.get(destinationName, teleportee);
-        if (targetPlayer != null) {
-            return getDestination("pl:" + targetPlayer.getName());
-        }
-
-        if (CANNON_PATTERN.matcher(destinationName).matches()) {
-            return getDestination(parseCannonDest(teleportee, destinationName));
-        }
-
-        return getDestination(destinationName);
-    }
-
-    /**
-     * Parses a cannon destination.
-     *
-     * @param teleportee        The player that is going to be teleported.
-     * @param destinationName   The destination to parse.
-     * @return A destination string.
-     */
-    @NotNull
-    private String parseCannonDest(@NotNull Player teleportee,
-                                   @NotNull String destinationName) {
-
-        String[] cannonSpeed = destinationName.split("-");
-        try {
-            double speed = Double.parseDouble(cannonSpeed[1]);
-            destinationName = "ca:" + teleportee.getWorld().getName() + ":" + teleportee.getLocation().getX()
-                    + "," + teleportee.getLocation().getY() + "," + teleportee.getLocation().getZ() + ":"
-                    + teleportee.getLocation().getPitch() + ":" + teleportee.getLocation().getYaw() + ":" + speed;
-        }
-        catch (Exception e) {
-            destinationName = "i:invalid";
-        }
-
-        return destinationName;
-    }
-
     /**
      * Gets a new destination from a string.
      * Returns a new InvalidDestination if the string could not be parsed.
@@ -167,13 +101,4 @@ public class DestinationFactory {
         this.teleportCommand.addAdditonalPermission(other);
         return true;
     }
-
-    /**
-     * Gets all the {@link MVDestination} identifiers registered.
-     *
-     * @return A collection of destination identifiers.
-     */
-    public Collection<String> getRegisteredIdentifiers() {
-        return this.destList.keySet();
-    }
 }

src/main/java/com/onarandombox/MultiverseCore/listeners/MVEntityListener.java

@@ -11,7 +11,6 @@ import com.dumptruckman.minecraft.util.Logging;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
 import com.onarandombox.MultiverseCore.api.MultiverseWorld;
-import com.onarandombox.MultiverseCore.utils.CompatibilityLayer;
 import org.bukkit.World;
 import org.bukkit.entity.EntityType;
 import org.bukkit.entity.Player;
@@ -19,7 +18,6 @@ import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.entity.CreatureSpawnEvent;
 import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
-import org.bukkit.event.entity.EntityPortalEvent;
 import org.bukkit.event.entity.EntityRegainHealthEvent;
 import org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason;
 import org.bukkit.event.entity.FoodLevelChangeEvent;
@@ -109,17 +107,4 @@ public class MVEntityListener implements Listener {
         event.setCancelled(this.plugin.getMVWorldManager().getTheWorldPurger().shouldWeKillThisCreature(mvworld, event.getEntity()));
     }
 
-    /**
-     * Handles portal search radius adjustment.
-     * @param event The Event that was fired.
-     */
-    @EventHandler
-    public void entityPortal(EntityPortalEvent event) {
-        if (event.isCancelled() || event.getTo() == null) {
-            return;
-        }
-        if (!this.plugin.getMVConfig().isUsingDefaultPortalSearch()) {
-            CompatibilityLayer.setPortalSearchRadius(event, this.plugin.getMVConfig().getPortalSearchRadius());
-        }
-    }
 }

src/main/java/com/onarandombox/MultiverseCore/listeners/MVPlayerListener.java

@@ -7,6 +7,10 @@
 
 package com.onarandombox.MultiverseCore.listeners;
 
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
+
 import com.dumptruckman.minecraft.util.Logging;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
@@ -31,9 +35,6 @@ import org.bukkit.event.player.PlayerQuitEvent;
 import org.bukkit.event.player.PlayerRespawnEvent;
 import org.bukkit.event.player.PlayerTeleportEvent;
 
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
-
 /**
  * Multiverse's {@link Listener} for players.
  */
@@ -312,8 +313,16 @@ public class MVPlayerListener implements Listener {
                     + "' was allowed to go to '" + event.getTo().getWorld().getName()
                     + "' because enforceaccess is off.");
         }
-        if (!this.plugin.getMVConfig().isUsingDefaultPortalSearch()) {
-            CompatibilityLayer.setPortalSearchRadius(event, this.plugin.getMVConfig().getPortalSearchRadius());
+        if (!plugin.getMVConfig().isUsingDefaultPortalSearch()) {
+            try {
+                Class.forName("org.bukkit.TravelAgent");
+                if (event.getPortalTravelAgent() != null) {
+                    event.getPortalTravelAgent().setSearchRadius(plugin.getMVConfig().getPortalSearchRadius());
+                }
+            } catch (ClassNotFoundException ignore) {
+                Logging.fine("TravelAgent not available for PlayerPortalEvent for " + event.getPlayer().getName());
+            }
+
         }
     }
 

src/main/java/com/onarandombox/MultiverseCore/utils/CompatibilityLayer.java

@@ -1,35 +1,32 @@
 package com.onarandombox.MultiverseCore.utils;
 
 import com.dumptruckman.minecraft.util.Logging;
-import org.bukkit.event.entity.EntityPortalEvent;
-import org.bukkit.event.player.PlayerPortalEvent;
+import org.bukkit.Bukkit;
 import org.bukkit.event.player.PlayerRespawnEvent;
 
 import java.lang.reflect.Method;
 
 /**
- * Utility class to enable version specific minecraft features.
+ * A utility class to enable version specific minecraft features.
  */
 public class CompatibilityLayer {
 
     private static Method checkAnchorSpawn;
-    private static boolean useTravelAgent;
-    private static Method playerPortalSearchRadius;
-    private static Method entityPortalSearchRadius;
 
     /**
-     * Initialise the reflection class, methods and fields.
+     * Initialise the reflection methods.
      */
     public static void init() {
-        checkAnchorSpawn = ReflectHelper.getMethod(PlayerRespawnEvent.class, "isAnchorSpawn");
-        useTravelAgent = ReflectHelper.hasClass("org.bukkit.TravelAgent");
-        playerPortalSearchRadius = ReflectHelper.getMethod(PlayerPortalEvent.class, "setSearchRadius", int.class);
-        entityPortalSearchRadius = ReflectHelper.getMethod(EntityPortalEvent.class, "setSearchRadius", int.class);
+        try {
+            checkAnchorSpawn = PlayerRespawnEvent.class.getDeclaredMethod("isAnchorSpawn");
+        } catch (NoSuchMethodException e) {
+            Logging.fine("%s does not support respawn anchors.", Bukkit.getVersion());
+        }
     }
 
     /**
-     * <p>Check if the respawn point is of respawn anchor type.</p>
-     * <p>Introduced in minecraft 1.16</p>
+     * Check if the respawn point is of respawn anchor type.
+     * Introduced in minecraft 1.16
      *
      * @param event A player respawn event.
      * @return If the respawn location is an anchor point.
@@ -38,69 +35,12 @@ public class CompatibilityLayer {
         if (checkAnchorSpawn == null) {
             return false;
         }
-        Boolean result = ReflectHelper.invokeMethod(event, checkAnchorSpawn);
-        if (result == null) {
-            Logging.warning("Unable to check if spawning at respawn anchor!");
-            return false;
+        try {
+            return (boolean) checkAnchorSpawn.invoke(event);
+        } catch (Exception e) {
+            Logging.warning("Error checking for: %s", checkAnchorSpawn);
+            e.printStackTrace();
         }
-        return result;
+        return false;
     }
-
-    /**
-     * <p>Gets if Travel Agent is supported on the server's minecraft version.</p>
-     * <p>Removed in minecraft 1.14</p>
-     *
-     * @return True if Travel Agent is supported, else false.
-     */
-    public static boolean isUseTravelAgent() {
-        return useTravelAgent;
-    }
-
-    /**
-     * <p>Sets search radius for a PlayerPortalEvent.</p>
-     *
-     * <p>Use travel agent if available, else using new PlayerPortalEvent.setSearchRadius(int) method
-     * introduced in minecraft 1.15</p>
-     *
-     * @param event         A Player Portal Event.
-     * @param searchRadius  Target search radius to set to.
-     */
-    public static void setPortalSearchRadius(PlayerPortalEvent event, int searchRadius) {
-        if (useTravelAgent) {
-            event.getPortalTravelAgent().setSearchRadius(searchRadius);
-            event.useTravelAgent(true);
-            Logging.finer("Used travel agent to set player portal search radius.");
-            return;
-        }
-        if (playerPortalSearchRadius == null) {
-            Logging.warning("Unable to set player portal search radius!");
-            return;
-        }
-        ReflectHelper.invokeMethod(event, playerPortalSearchRadius, searchRadius);
-        Logging.finer("Used new method to set player portal search radius.");
-    }
-
-    /**
-     * <p>Sets search radius for a EntityPortalEvent.</p>
-     *
-     * <p>Use travel agent if available, else using new EntityPortalEvent.setSearchRadius(int) method
-     * introduced in minecraft 1.15</p>
-     *
-     * @param event         A Entity Portal Event.
-     * @param searchRadius  Target search radius to set to.
-     */
-    public static void setPortalSearchRadius(EntityPortalEvent event, int searchRadius) {
-        if (useTravelAgent) {
-            event.getPortalTravelAgent().setSearchRadius(searchRadius);
-            event.useTravelAgent(true);
-            Logging.finer("Used travel agent to set entity portal search radius.");
-            return;
-        }
-        if (entityPortalSearchRadius == null) {
-            Logging.warning("Unable to set entity portal search radius!");
-            return;
-        }
-        ReflectHelper.invokeMethod(event, entityPortalSearchRadius, searchRadius);
-        Logging.finer("Used new method to set entity portal search radius.");
-    }
-}
+}

src/main/java/com/onarandombox/MultiverseCore/utils/PlayerFinder.java

@@ -1,176 +0,0 @@
-package com.onarandombox.MultiverseCore.utils;
-
-import com.dumptruckman.minecraft.util.Logging;
-import org.bukkit.Bukkit;
-import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.ArrayList;
-import java.util.List;
-import java.util.UUID;
-import java.util.regex.Pattern;
-import java.util.stream.Collectors;
-
-/**
- * Helper class to get {@link Player} from name, UUID or Selectors.
- */
-public class PlayerFinder {
-
-    private static final Pattern UUID_REGEX = Pattern.compile("[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}");
-    private static final Pattern COMMA_SPLIT = Pattern.compile(",");
-
-    /**
-     * Get a {@link Player} based on an identifier of name UUID or selector.
-     *
-     * @param playerIdentifier  An identifier of name UUID or selector.
-     * @param sender            Target sender for selector.
-     * @return The player if found, else null.
-     */
-    @Nullable
-    public static Player get(@NotNull String playerIdentifier,
-                             @NotNull CommandSender sender) {
-
-        Player targetPlayer = getByName(playerIdentifier);
-        if (targetPlayer != null) {
-            return targetPlayer;
-        }
-        targetPlayer = getByUuid(playerIdentifier);
-        if (targetPlayer != null) {
-            return targetPlayer;
-        }
-        return getBySelector(playerIdentifier, sender);
-    }
-
-    /**
-     * Get multiple {@link Player} based on many identifiers of name UUID or selector.
-     *
-     * @param playerIdentifiers An identifier of multiple names, UUIDs or selectors, separated by comma.
-     * @param sender            Target sender for selector.
-     * @return A list of all the {@link Player} found.
-     */
-    @Nullable
-    public static List<Player> getMulti(@NotNull String playerIdentifiers,
-                                        @NotNull CommandSender sender) {
-
-        String[] playerIdentifierArray = COMMA_SPLIT.split(playerIdentifiers);
-        if (playerIdentifierArray == null || playerIdentifierArray.length == 0) {
-            return null;
-        }
-
-        List<Player> playerResults = new ArrayList<>();
-        for (String playerIdentifier : playerIdentifierArray) {
-            Player targetPlayer = getByName(playerIdentifier);
-            if (targetPlayer != null) {
-                playerResults.add(targetPlayer);
-                continue;
-            }
-            targetPlayer = getByUuid(playerIdentifier);
-            if (targetPlayer != null) {
-                playerResults.add(targetPlayer);
-                continue;
-            }
-            List<Player> targetPlayers = getMultiBySelector(playerIdentifier, sender);
-            if (targetPlayers != null) {
-                playerResults.addAll(targetPlayers);
-            }
-        }
-        return playerResults;
-    }
-
-    /**
-     * Get a {@link Player} based on player name.
-     *
-     * @param playerName    Name of a {@link Player}.
-     * @return The player if found, else null.
-     */
-    @Nullable
-    public static Player getByName(@NotNull String playerName) {
-        return Bukkit.getPlayerExact(playerName);
-    }
-
-    /**
-     * Get a {@link Player} based on player UUID.
-     *
-     * @param playerUuid    UUID of a player.
-     * @return The player if found, else null.
-     */
-    @Nullable
-    public static Player getByUuid(@NotNull String playerUuid) {
-        if (!UUID_REGEX.matcher(playerUuid).matches()) {
-            return null;
-        }
-        UUID uuid;
-        try {
-            uuid = UUID.fromString(playerUuid);
-        } catch (Exception e) {
-            return null;
-        }
-        return getByUuid(uuid);
-    }
-
-    /**
-     * Get a {@link Player} based on playerUUID.
-     *
-     * @param playerUuid    UUID of a player.
-     * @return The player if found, else null.
-     */
-    @Nullable
-    public static Player getByUuid(@NotNull UUID playerUuid) {
-        return Bukkit.getPlayer(playerUuid);
-    }
-
-    /**
-     * Get a {@link Player} based on vanilla selectors.
-     * https://minecraft.gamepedia.com/Commands#Target_selectors
-     *
-     * @param playerSelector    A target selector, usually starts with an '@'.
-     * @param sender            Target sender for selector.
-     * @return The player if only one found, else null.
-     */
-    @Nullable
-    public static Player getBySelector(@NotNull String playerSelector,
-                                       @NotNull CommandSender sender) {
-
-        List<Player> matchedPlayers = getMultiBySelector(playerSelector, sender);
-        if (matchedPlayers == null || matchedPlayers.isEmpty()) {
-            Logging.fine("No player found with selector '%s' for %s.", playerSelector, sender.getName());
-            return null;
-        }
-        if (matchedPlayers.size() > 1) {
-            Logging.warning("Ambiguous selector result '%s' for %s (more than one player matched) - %s",
-                    playerSelector, sender.getName(), matchedPlayers.toString());
-            return null;
-        }
-        return matchedPlayers.get(0);
-    }
-
-    /**
-     * Get multiple {@link Player} based on selector.
-     * https://minecraft.gamepedia.com/Commands#Target_selectors
-     *
-     * @param playerSelector    A target selector, usually starts with an '@'.
-     * @param sender            Target sender for selector.
-     * @return A list of all the {@link Player} found.
-     */
-    @Nullable
-    public static List<Player> getMultiBySelector(@NotNull String playerSelector,
-                                                  @NotNull CommandSender sender) {
-
-        if (playerSelector.charAt(0) != '@') {
-            return null;
-        }
-        try {
-            return Bukkit.selectEntities(sender, playerSelector).stream()
-                    .filter(e -> e instanceof Player)
-                    .map(e -> ((Player) e))
-                    .collect(Collectors.toList());
-        } catch (IllegalArgumentException e) {
-            Logging.warning("An error occurred while parsing selector '%s' for %s. Is it is the correct format?",
-                    playerSelector, sender.getName());
-            e.printStackTrace();
-            return null;
-        }
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/utils/ReflectHelper.java

@@ -1,140 +0,0 @@
-package com.onarandombox.MultiverseCore.utils;
-
-import org.jetbrains.annotations.Nullable;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-
-/**
- * Utility class used to help in doing various reflection actions.
- */
-public class ReflectHelper {
-
-    /**
-     * Try to get the {@link Class} based on its classpath.
-     *
-     * @param classPath The target classpath.
-     * @return A {@link Class} if found, else null.
-     */
-    @Nullable
-    public static Class<?> getClass(String classPath) {
-        try {
-            return Class.forName(classPath);
-        } catch (ClassNotFoundException e) {
-            return null;
-        }
-    }
-
-    /**
-     * Check if the {@link Class} for a give classpath is present/valid.
-     *
-     * @param classPath Target classpath.
-     * @return True if class path is a valid class, else false.
-     */
-    public static boolean hasClass(String classPath) {
-        return getClass(classPath) != null;
-    }
-
-    /**
-     * Try to get a {@link Method} from a given class.
-     *
-     * @param clazz             The class to search the method on.
-     * @param methodName        Name of the method to get.
-     * @param parameterTypes    Parameters present for that method.
-     * @param <C>               The class type.
-     * @return A {@link Method} if found, else null.
-     */
-    @Nullable
-    public static <C> Method getMethod(Class<C> clazz, String methodName, Class<?>... parameterTypes) {
-        try {
-            Method method = clazz.getDeclaredMethod(methodName, parameterTypes);
-            method.setAccessible(true);
-            return method;
-        } catch (NoSuchMethodException e) {
-            return null;
-        }
-    }
-
-    /**
-     * Try to get a {@link Method} from a given class.
-     *
-     * @param classInstance     Instance of the class to search the method on.
-     * @param methodName        Name of the method to get.
-     * @param parameterTypes    Parameters present for that method.
-     * @param <C>               The class type.
-     * @return A {@link Method} if found, else null.
-     */
-    @Nullable
-    public static <C> Method getMethod(C classInstance, String methodName, Class<?>... parameterTypes) {
-        return getMethod(classInstance.getClass(), methodName, parameterTypes);
-    }
-
-    /**
-     * Calls a {@link Method}.
-     *
-     * @param classInstance Instance of the class responsible for the method.
-     * @param method        The method to call.
-     * @param parameters    Parameters needed when calling the method.
-     * @param <C>           The class type.
-     * @param <R>           The return type.
-     * @return Return value of the method call if any, else null.
-     */
-    @Nullable
-    public static <C, R> R invokeMethod(C classInstance, Method method, Object...parameters) {
-        try {
-            return (R) method.invoke(classInstance, parameters);
-        } catch (Exception e) {
-            return null;
-        }
-    }
-
-    /**
-     * Try to get a {@link Field} from a given class.
-     *
-     * @param clazz     The class to search the field on.
-     * @param fieldName Name of the field to get.
-     * @param <C>       The class type.
-     * @return A {@link Field} if found, else null.
-     */
-    @Nullable
-    public static <C> Field getField(Class<C> clazz, String fieldName) {
-        try {
-            Field field = clazz.getDeclaredField(fieldName);
-            field.setAccessible(true);
-            return field;
-        } catch (NoSuchFieldException e) {
-            return null;
-        }
-    }
-
-    /**
-     * Try to get a {@link Field} from a given class.
-     *
-     * @param classInstance Instance of the class to search the field on.
-     * @param fieldName     Name of the field to get.
-     * @param <C>           The class type.
-     * @return A {@link Field} if found, else null.
-     */
-    @Nullable
-    public static <C> Field getField(C classInstance, String fieldName) {
-        return getField(classInstance.getClass(), fieldName);
-    }
-
-    /**
-     * Gets the value of an {@link Field} from an instance of the class responsible.
-     *
-     * @param classInstance Instance of the class to get the field value from.
-     * @param field         The field to get value from.
-     * @param <C>           The class type.
-     * @param <V>           The field value type.
-     * @return The field value if any, else null.
-     */
-    @Nullable
-    public static <C, V> V getFieldValue(C classInstance, Field field)  {
-        try {
-            return (V) field.get(classInstance);
-        } catch (IllegalAccessException e) {
-            return null;
-        }
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/utils/WorldManager.java

@@ -18,7 +18,6 @@ import com.onarandombox.MultiverseCore.api.SafeTTeleporter;
 import com.onarandombox.MultiverseCore.api.WorldPurger;
 import com.onarandombox.MultiverseCore.event.MVWorldDeleteEvent;
 import org.bukkit.Bukkit;
-import org.bukkit.GameRule;
 import org.bukkit.Location;
 import org.bukkit.World;
 import org.bukkit.World.Environment;
@@ -37,25 +36,26 @@ import java.io.File;
 import java.io.FilenameFilter;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collection;
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
 import java.util.Set;
 import java.util.Stack;
+import java.util.Arrays;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
+import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 /**
  * Public facing API to add/remove Multiverse worlds.
  */
 public class WorldManager implements MVWorldManager {
     private final MultiverseCore plugin;
+    private final Pattern worldNamePattern = Pattern.compile("[a-zA-Z0-9/._-]+");
     private final WorldPurger worldPurger;
     private final Map<String, MultiverseWorld> worlds;
     private Map<String, WorldProperties> worldsFromTheConfig;
@@ -130,7 +130,7 @@ public class WorldManager implements MVWorldManager {
         }
 
         // Check for valid world name
-        if (!(WorldNameChecker.isValidWorldName(oldName) && WorldNameChecker.isValidWorldName(newName))) {
+        if (!(isValidWorldName(oldName) && isValidWorldName(newName))) {
             return false;
         }
 
@@ -238,9 +238,7 @@ public class WorldManager implements MVWorldManager {
             return false;
         }
 
-        if (!WorldNameChecker.isValidWorldName(name)) {
-            Logging.warning("Invalid world name '" + name + "'");
-            Logging.warning("World name should not contain spaces or special characters!");
+        if (!isValidWorldName(name)) {
             return false;
         }
 
@@ -387,14 +385,14 @@ public class WorldManager implements MVWorldManager {
             this.worldsFromTheConfig.get(name).cacheVirtualProperties();
             if (unloadBukkit && this.unloadWorldFromBukkit(name, true)) {
                 this.worlds.remove(name);
-                Logging.info("World '%s' was unloaded from Bukkit.", name);
+                Logging.info("World '%s' was unloaded from memory.", name);
                 return true;
             } else if (!unloadBukkit){
                 this.worlds.remove(name);
-                Logging.info("World '%s' was unloaded from Multiverse.", name);
+                Logging.info("World '%s' was unloaded from memory.", name);
                 return true;
             } else {
-                Logging.warning("World '%s' could not be unloaded from Bukkit. Is it a default world?", name);
+                Logging.warning("World '%s' could not be unloaded. Is it a default world?", name);
             }
         } else if (this.plugin.getServer().getWorld(name) != null) {
             Logging.warning("Hmm Multiverse does not know about this world but it's loaded in memory.");
@@ -426,6 +424,21 @@ public class WorldManager implements MVWorldManager {
         }
     }
 
+    /**
+     * Check if the world name is allowed
+     *
+     * @param name   Name of the world
+     * @return True if the world world name is valid based on regex
+     */
+    private boolean isValidWorldName(String name) {
+        if (!worldNamePattern.matcher(name).matches()) {
+            Logging.warning("Invalid world name '" + name + "'");
+            Logging.warning("World name should not contain spaces or special characters!");
+            return false;
+        }
+        return true;
+    }
+
     private void brokenWorld(String name) {
         Logging.severe("The world '" + name + "' could NOT be loaded because it contains errors and is probably corrupt!");
         Logging.severe("Try using Minecraft Region Fixer to repair your world! '" + name + "'");
@@ -617,14 +630,6 @@ public class WorldManager implements MVWorldManager {
      */
     @Override
     public MultiverseWorld getMVWorld(String name) {
-        return this.getMVWorld(name, true);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public MultiverseWorld getMVWorld(String name, boolean checkAliases) {
         if (name == null) {
             return null;
         }
@@ -632,7 +637,7 @@ public class WorldManager implements MVWorldManager {
         if (world != null) {
             return world;
         }
-        return (checkAliases) ? this.getMVWorldByAlias(name) : null;
+        return this.getMVWorldByAlias(name);
     }
 
     /**
@@ -641,7 +646,7 @@ public class WorldManager implements MVWorldManager {
     @Override
     public MultiverseWorld getMVWorld(World world) {
         if (world != null) {
-            return this.getMVWorld(world.getName(), false);
+            return this.getMVWorld(world.getName());
         }
         return null;
     }
@@ -666,15 +671,7 @@ public class WorldManager implements MVWorldManager {
      */
     @Override
     public boolean isMVWorld(final String name) {
-        return this.isMVWorld(name, true);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public boolean isMVWorld(final String name, boolean checkAliases) {
-        return this.worlds.containsKey(name) || (checkAliases && this.isMVWorldAlias(name));
+        return (this.worlds.containsKey(name) || isMVWorldAlias(name));
     }
 
     /**
@@ -897,23 +894,12 @@ public class WorldManager implements MVWorldManager {
      */
     @Override
     public boolean regenWorld(String name, boolean useNewSeed, boolean randomSeed, String seed) {
-        return regenWorld(name, useNewSeed, randomSeed, seed, false);
-    }
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-    public boolean regenWorld(String name, boolean useNewSeed, boolean randomSeed, String seed, boolean keepGameRules) {
         MultiverseWorld world = this.getMVWorld(name);
-        if (world == null) {
-            Logging.warning("Unable to regen a world that does not exist!");
+        if (world == null)
             return false;
-        }
 
         List<Player> ps = world.getCBWorld().getPlayers();
 
-        // Apply new seed if needed.
         if (useNewSeed) {
             long theSeed;
 
@@ -929,64 +915,19 @@ public class WorldManager implements MVWorldManager {
 
             world.setSeed(theSeed);
         }
-
         WorldType type = world.getWorldType();
 
-        // Save current GameRules if needed.
-        Map<GameRule<?>, Object> gameRuleMap = null;
-        if (keepGameRules) {
-            gameRuleMap = new HashMap<>(GameRule.values().length);
-            World CBWorld = world.getCBWorld();
-            for (GameRule<?> gameRule : GameRule.values()) {
-                // Only save if not default value.
-                Object value = CBWorld.getGameRuleValue(gameRule);
-                if (value != CBWorld.getGameRuleDefault(gameRule)) {
-                    gameRuleMap.put(gameRule, value);
-                }
+        if (this.deleteWorld(name, false, false)) {
+            this.doLoad(name, true, type);
+            SafeTTeleporter teleporter = this.plugin.getSafeTTeleporter();
+            Location newSpawn = world.getSpawnLocation();
+            // Send all players that were in the old world, BACK to it!
+            for (Player p : ps) {
+                teleporter.safelyTeleport(null, p, newSpawn, true);
             }
+            return true;
         }
-
-        // Do the regen.
-        if (!this.deleteWorld(name, false, false)) {
-            Logging.severe("Unable to regen world as world cannot be deleted.");
-            return false;
-        }
-        if (!this.doLoad(name, true, type)) {
-            Logging.severe("Unable to regen world as world cannot be loaded.");
-            return false;
-        }
-
-        // Get new MultiverseWorld reference.
-        world = this.getMVWorld(name);
-
-        // Load back GameRules if needed.
-        if (keepGameRules) {
-            Logging.fine("Restoring previous world's GameRules...");
-            World CBWorld = world.getCBWorld();
-            for (Map.Entry<GameRule<?>, Object> gameRuleEntry : gameRuleMap.entrySet()) {
-                if (!setGameRuleValue(CBWorld, gameRuleEntry.getKey(), gameRuleEntry.getValue())) {
-                    Logging.warning("Unable to set GameRule '%s' to '%s' on regen world.",
-                            gameRuleEntry.getKey().getName(), gameRuleEntry.getValue());
-                }
-            }
-        }
-
-        // Send all players that were in the old world, BACK to it!
-        SafeTTeleporter teleporter = this.plugin.getSafeTTeleporter();
-        Location newSpawn = world.getSpawnLocation();
-        for (Player p : ps) {
-            teleporter.safelyTeleport(null, p, newSpawn, true);
-        }
-
-        return true;
-    }
-
-    private <T> boolean setGameRuleValue(World world, GameRule<T> gameRule, Object value) {
-        try {
-            return world.setGameRule(gameRule, (T) value);
-        } catch (Exception e) {
-            return false;
-        }
+        return false;
     }
 
     /**
@@ -1012,21 +953,4 @@ public class WorldManager implements MVWorldManager {
 		}
 		return false;
 	}
-
-    /**
-     * {@inheritDoc}
-     */
-    @Override
-	public Collection<String> getPotentialWorlds() {
-        File worldContainer = this.plugin.getServer().getWorldContainer();
-        if (worldContainer == null) {
-            return Collections.emptyList();
-        }
-        return Arrays.stream(worldContainer.listFiles())
-                .filter(File::isDirectory)
-                .filter(folder -> !this.isMVWorld(folder.getName(), false))
-                .filter(WorldNameChecker::isValidWorldFolder)
-                .map(File::getName)
-                .collect(Collectors.toList());
-    }
 }

src/main/java/com/onarandombox/MultiverseCore/utils/WorldNameChecker.java

@@ -1,159 +0,0 @@
-package com.onarandombox.MultiverseCore.utils;
-
-import org.bukkit.Bukkit;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.io.File;
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Set;
-import java.util.regex.Pattern;
-
-/**
- * <p>Utility class in helping to check the status of a world name and it's associated world folder.</p>
- *
- * <p>Note this is for preliminary checks and better command output. A valid result will suggest but not
- * 100% determine that a world name can be created, loaded or imported.</p>
- */
-public class WorldNameChecker {
-
-    private static final Pattern WORLD_NAME_PATTERN = Pattern.compile("[a-zA-Z0-9/._-]+");
-    private static final Set<String> BLACKLIST_NAMES = Collections.unmodifiableSet(new HashSet<String>() {{
-        add("plugins");
-        add("logs");
-        add("cache");
-        add("crash-reports");
-    }});
-
-    /**
-     * Checks if a world name is valid.
-     *
-     * @param worldName The world name to check on.
-     * @return True if check result is valid, else false.
-     */
-    public static boolean isValidWorldName(@Nullable String worldName) {
-        return checkName(worldName) == NameStatus.VALID;
-    }
-
-    /**
-     * Checks the current validity status of a world name.
-     *
-     * @param worldName The world name to check on.
-     * @return The resulting name status.
-     */
-    @NotNull
-    public static NameStatus checkName(@Nullable String worldName) {
-        if (BLACKLIST_NAMES.contains(worldName)) {
-            return NameStatus.BLACKLISTED;
-        }
-        if (worldName == null || !WORLD_NAME_PATTERN.matcher(worldName).matches()) {
-            return NameStatus.INVALID_CHARS;
-        }
-        return NameStatus.VALID;
-    }
-
-    /**
-     * Checks if a world name has a valid world folder.
-     *
-     * @param worldName The world name to check on.
-     * @return True if check result is valid, else false.
-     */
-    public static boolean isValidWorldFolder(@Nullable String worldName) {
-        return checkFolder(worldName) == FolderStatus.VALID;
-    }
-
-    /**
-     * Checks if a world folder is valid.
-     *
-     * @param worldFolder   The world folder to check on.
-     * @return True if check result is valid, else false.
-     */
-    public static boolean isValidWorldFolder(@Nullable File worldFolder) {
-        return checkFolder(worldFolder) == FolderStatus.VALID;
-    }
-
-    /**
-     * Checks the current folder status for a world name.
-     *
-     * @param worldName The world name to check on.
-     * @return The resulting folder status.
-     */
-    @NotNull
-    public static FolderStatus checkFolder(@Nullable String worldName) {
-        if (worldName == null) {
-            return FolderStatus.DOES_NOT_EXIST;
-        }
-        File worldFolder = new File(Bukkit.getWorldContainer(), worldName);
-        return checkFolder(worldFolder);
-    }
-
-    /**
-     * Checks the current folder status.
-     *
-     * @param worldFolder   The world folder to check on.
-     * @return The resulting folder status.
-     */
-    @NotNull
-    public static FolderStatus checkFolder(@Nullable File worldFolder) {
-        if (worldFolder == null || !worldFolder.exists() || !worldFolder.isDirectory()) {
-            return FolderStatus.DOES_NOT_EXIST;
-        }
-        if (!folderHasDat(worldFolder)) {
-            return FolderStatus.NOT_A_WORLD;
-        }
-        return FolderStatus.VALID;
-    }
-
-    /**
-     * A very basic check to see if a folder has a level.dat file. If it does, we can safely assume
-     * it's a world folder.
-     *
-     * @param worldFolder   The File that may be a world.
-     * @return True if it looks like a world, else false.
-     */
-    private static boolean folderHasDat(@NotNull File worldFolder) {
-        File[] files = worldFolder.listFiles((file, name) -> name.toLowerCase().endsWith(".dat"));
-        return files != null && files.length > 0;
-    }
-
-    /**
-     * Result after checking validity of world name.
-     */
-    public enum NameStatus {
-        /**
-         * Name is valid.
-         */
-        VALID,
-
-        /**
-         * Name not valid as it contains invalid characters.
-         */
-        INVALID_CHARS,
-
-        /**
-         * Name not valid as it is deemed blacklisted.
-         */
-        BLACKLISTED
-    }
-
-    /**
-     * Result after checking validity of world folder.
-     */
-    public enum FolderStatus {
-        /**
-         * Folder is valid.
-         */
-        VALID,
-
-        /**
-         * Folder exist, but contents in it doesnt look like a world.
-         */
-        NOT_A_WORLD,
-
-        /**
-         * Folder does not exist.
-         */
-        DOES_NOT_EXIST
-    }
-}

src/main/java/com/onarandombox/MultiverseCore/utils/metrics/MetricsHelper.java

@@ -1,12 +1,11 @@
 package com.onarandombox.MultiverseCore.utils.metrics;
 
-import org.bstats.charts.AdvancedPie;
-import org.bstats.charts.MultiLineChart;
-
 import java.util.HashMap;
 import java.util.Map;
 import java.util.function.Consumer;
 
+import org.bstats.bukkit.Metrics;
+
 enum MetricsHelper {
     ;
 
@@ -18,16 +17,16 @@ enum MetricsHelper {
         map.put(key, count + 1);
     }
 
-    static AdvancedPie createAdvancedPieChart(String chartId, Consumer<Map<String, Integer>> metricsFunc) {
+    static Metrics.AdvancedPie createAdvancedPieChart(String chartId, Consumer<Map<String, Integer>> metricsFunc) {
         Map<String, Integer> map = new HashMap<>();
         metricsFunc.accept(map);
-        return new AdvancedPie(chartId, () -> map);
+        return new Metrics.AdvancedPie(chartId, () -> map);
     }
 
-    static MultiLineChart createMultiLineChart(String chartId, Consumer<Map<String, Integer>> metricsFunc) {
+    static Metrics.MultiLineChart createMultiLineChart(String chartId, Consumer<Map<String, Integer>> metricsFunc) {
         Map<String, Integer> map = new HashMap<>();
         metricsFunc.accept(map);
-        return new MultiLineChart(chartId, () -> map);
+        return new Metrics.MultiLineChart(chartId, () -> map);
     }
 
 }

src/main/java/com/onarandombox/MultiverseCore/utils/webpaste/PasteServiceType.java

@@ -22,5 +22,9 @@ public enum PasteServiceType {
     /**
      * @see GitHubPasteService
      */
-    GITHUB
+    GITHUB,
+    /**
+     * No paste service used.
+     */
+    NONE
 }

src/test/java/com/onarandombox/MultiverseCore/TestWorldStuff.java

@@ -207,7 +207,7 @@ public class TestWorldStuff {
         assertEquals(0, creator.getCore().getMVWorldManager().getMVWorlds().size());
 
         // Verify
-        verify(mockCommandSender).sendMessage("Invalid generator! 'BogusGen'. " + ChatColor.RED + "Aborting world creation.");
+        verify(mockCommandSender).sendMessage("§cError: Invalid generator string 'BogusGen'. See /mv gens for available generators.");
     }
 
     @Test