4.1.4

Update Loom and Gradle to Latest

.gitattributes

@@ -0,0 +1,7 @@
+* text=auto
+
+*.sh text eol=lf
+gradlew text eol=lf
+*.bat text eol=crlf
+
+*.jar binary

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -60,4 +60,6 @@ body:
         - label: I ticked all of the boxes without actually reading them
           required: false
         - label: I have read the Compatibility wiki page and am not trying to run the plugin on an unsupported server version / platform
+          required: true
+        - label: I am willing to cooperate to get this issue resolved faster, including providing any additional information requested or testing new builds
           required: true

.github/ISSUE_TEMPLATE/compatibility_issue.yml

@@ -0,0 +1,38 @@
+name: Compatibility issue
+description: A compatibility issue with another plugin/mod or a specific version of a platform marked as supported
+labels: ["Type: Compatibility issue"]
+body:
+  - type: input
+    attributes:
+      label: TAB version
+      description: Full version in numbers, "latest" is not a version.
+      placeholder: 4.0.0
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Software causing compatibility issue
+      description: plugin/mod/platform version causing the issue
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional info
+      description: Anything else you want to provide that will help in resolving the issue faster.
+    validations:
+      required: false
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Let's make sure this report is valid
+      options:
+        - label: I am running latest version of the plugin
+          required: true
+        - label: I ticked all of the boxes without actually reading them
+          required: false
+        - label: The compatibility wiki page does not mention this incompatibility
+          required: true
+        - label: I am willing to cooperate to get this issue resolved faster, including providing any additional information requested or testing new builds
+          required: true

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,5 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Support
+    url: https://discord.gg/YPqXt63YQj
+    about: Fresh new community discord providing support with all plugins, including TAB

.github/workflows/build.yml

@@ -3,21 +3,19 @@ on:
   push:
     branches:
       - master
-  pull_request:
-    types: [opened, synchronize, reopened]
 jobs:
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.3.0 #https://github.com/actions/checkout/releases
+      - uses: actions/checkout@v4 #https://github.com/actions/checkout/releases
         with:
           fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
-      - name: Set up JDK 11
-        uses: actions/setup-java@v3.9.0 #https://github.com/actions/setup-java/releases
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4 #https://github.com/actions/setup-java/releases
         with:
           distribution: 'temurin'
-          java-version: 11
+          java-version: 21
       - name: Cache SonarCloud packages
         uses: actions/cache@v3.2.3 #https://github.com/actions/cache/releases
         with:
@@ -40,5 +38,5 @@ jobs:
       - name: Upload a Build Artifact
         uses: actions/upload-artifact@v3.1.2 #https://github.com/actions/upload-artifact/releases
         with:
-          name: Jar
+          name: Click here to download
           path: jar/build/libs/TAB-**.jar

.gitignore

@@ -33,7 +33,6 @@ hs_err_pid*
 .idea/
 
 # other
-.gitattributes
 *.iml
 run/
 

CONTRIBUTING.md

@@ -6,5 +6,4 @@ is in quality of the report (typically providing correct steps to reproduce that
 * Test **experimental builds**, which can be found in [GitHub Actions](https://github.com/NEZNAMY/TAB/actions) for problems of any kind including bugs. 
 This way you will help make the actual releases more stable / help get stable releases sooner.
 * Help improve the wiki by opening a [Wiki change issue](https://github.com/NEZNAMY/TAB/issues/new?assignees=&labels=Wiki&template=wiki_change.yml), 
-where you can improve existing descriptions, add information you found missing, fix typos / grammar mistakes or add more examples of usage of functions.
-* [Buy a copy](https://builtbybit.com/resources/14009/) of the plugin or [send a donation](https://paypal.me/neznamy1) to keep the plugin active.
+where you can improve existing descriptions, add information you found missing, fix typos / grammar mistakes or add more examples.

README.md

@@ -1,86 +1,58 @@
 # About
 TAB aims to be a superior all-in-one minecraft plugin for displaying information that outperforms all 
-similar plugins in terms of features, performance, compatibility and support.  
+similar plugins in terms of features, performance and compatibility.  
 More information can be found at [Why TAB?](https://github.com/NEZNAMY/TAB/wiki/Why-TAB%3F) wiki page.
 
-# Distribution
-As of TAB 3.0.0, released with MC 1.18 (November 30th, 2021), there is no free / premium
-version anymore. Only one version of the plugin exists now, which contains all implemented features
-and is available to everyone for free. However, customer support is only provided to 
-customers who have purchased the plugin (see [Customer support](#customer-support)).  
+# Download
+### Releases
+You can download full releases from [GitHub releases](https://github.com/NEZNAMY/TAB/releases), 
+[SpigotMC](https://www.spigotmc.org/resources/57806/), [Modrinth](https://modrinth.com/plugin/tab-was-taken) or [BuiltByBit](https://builtbybit.com/resources/20631).
+
+### Dev builds
+Plugin's development is continuous and contains lots of small changes/fixes not worthy of being called a full
+update, therefore development builds are being created and eventually a full update is released when enough changes are made.  
+If you want to benefit from a recent change in the code before official release, you can download development builds
+from [GitHub actions](https://github.com/NEZNAMY/TAB/actions) (you must be logged into GitHub to be able to download it).  
 
 # Compiling
-Compilation requires JDK 8 and up.  
+Compilation requires JDK 21 and up.  
 To compile the plugin, run `./gradlew build` from the terminal.  
 Once the plugin compiles, grab the jar from `/jar/build/libs/` folder.  
 The universal jar contains all modules for all supported platforms.
 
-# Customer support
-Unlike with other projects where requirements and level of support provided are unclear,
-we provide a clear answer to what kind of service you will or will not receive. Some don't
-even clearly state if they are free or paid. While they are listed as paid on spigot, they have
-a free download link in description, which can be confusing.  
-  
-Free plugins typically do have a support discord, however you will rarely receive
-official support from the developers, especially for large projects with tons of users, where
-helping everyone in the world (theoretically) would consume too much time, leaving authors
-no time left to actually work on the project.
-In the end, they are free, made by people in their free time, and they are allowed to choose
-what they do or don't want to do in their free time. They often leave support to other people,
-possibly staff members, who are, however, in the end just more volunteers who may not even know
-the answer.  
-  
-With paid plugins you are more likely to receive support, but unless explicitly said, nothing is
-guaranteed. There are lots of paid plugins where authors don't provide any support or redirect
-it to helpers, where again they are unpaid volunteers who might not even know the answer.  
-  
-In TAB, everything is clearly defined. The plugin is free to download for everyone.
-Customer support, however, is only provided to customers who have formally purchased a copy 
-of the plugin on any of the websites the plugin is being sold on:  
-* [BuiltByBit](https://builtbybit.com/resources/14009/) (accepts any payment method)  
-* [Polymart](https://polymart.org/resource/484) (only PayPal)
-  
-After purchasing, you can request assistance via either private messages on the website where you
-have purchased it, or using [TAB's Discord server](https://discord.gg/EaSvdk6) (which is highly 
-preferred, since the communication will be much faster thanks to notifications and more).  
-* We use a ticket system, which allows us to effectively track any amount of unresolved problems.
-No more questions getting lost in the sea of messages from other people asking. Tickets are only closed
-after user confirmed all of their questions were answered and then receive a transcript of the ticket
-from the bot after ticket is closed into private messages (unless user is blocking them).
-* We do not rely on the community helping, which often makes things even worse. We know people have
-better things to do than helping random people with a random plugin, especially when most people only
-have a very basic knowledge of the plugin, not being able to answer more complicated problems.
-* We have notifications enabled and reply as soon as possible. We do not have the server muted unlike
-most mods on most servers who only check it when they are really bored, give a wiki link and 
-disappear again.
-* As the developer, I do not rely on helpers providing support instead of me. They are handy as
-I am obviously not available 24/7, but I do not intentionally leave anything to them. I reply
-whenever I am available without any intentional delays.  
-  
-The wiki contains everything about the plugin in one way or another, so support should not 
-even be needed. It also contains a few examples, but obviously cannot contain a pre-made config
-for every possible idea anyone can come up with.  
-Support is provided to people who decided paying for support is more time efficient than reading the wiki,
-especially for serious servers, where price of the plugin is nothing compared to other server costs.
-
-# Other links
-Download the plugin for free: 
-* [GitHub releases](https://github.com/NEZNAMY/TAB/releases)
-* [BuiltByBit](https://builtbybit.com/resources/20631/)
-* [Modrinth](https://modrinth.com/plugin/tab-was-taken)
-  
-[Wiki](https://github.com/NEZNAMY/TAB/wiki)  
-[Donate](https://paypal.me/neznamy1) if you are feeling extra generous
+# Documentation
+You can find everything about the plugin on the [Wiki](https://github.com/NEZNAMY/TAB/wiki). This includes a detailed description
+of all features, as well as information regarding compatibility or limitations of each feature.  
 
 # Issues
-The [Issues](https://github.com/NEZNAMY/TAB/issues) section is **only** available for cases included in templates.
-In other words, they **are not available for**:  
-* **Support** - support is provided on discord for buyers, where roles are given to verified users
-allowing us to know who bought it and who didn't. It also serves as a much faster way of communication.
-* **Feature requests** - closed indefinitely.
-  
-**If you're a customer, please use discord for reporting bugs, especially if you aren't good at making bug reports. 
-You will be provided with a much faster and higher quality service.**
+The [Issues](https://github.com/NEZNAMY/TAB/issues) section is an issue tracker for all the kind of problems covered in issue templates.
+Please refrain from attempting to use it to receive help with your server, such issues will be closed immediately.  
+When opening an issue, provide as much information as possible. The difference between a bug getting fixed in 1 week vs 1 hour
+is in quality of the report. Bug reports where steps to reproduce are "idk" have no value and will not help to get the bug fixed at all.  
 
 # Contributing
 See [CONTRIBUTING.md](https://github.com/NEZNAMY/TAB/blob/master/CONTRIBUTING.md)
+
+# Provided services
+The plugin is being used by a large amount of servers, which also means the demand for my attention is high. Unfortunately, 
+I am no longer able to keep up with the demand since I don't want to dedicate my whole existence to a free plugin. 
+In order to provide the best quality of all provided services, the amount of services provided may vary over time. 
+Here is the full list of potential services and their status:
+
+| Service type                  | Availability |
+|-------------------------------|--------------|
+| Updates for new MC versions   | ✔            |
+| Bug fixes                     | ✔            |
+| Wiki updates<sup>1</sup>      | ✔            |
+| Feature requests              | ❌            |
+| Customer support<sup>2</sup>  | ✔            |
+| Free user support<sup>3</sup> | ❌*           |
+| Optimization<sup>4</sup>      | ✔            |
+
+<sup>1</sup> - Adding new examples, guides and other kind of useful information people ask about.  
+<sup>2</sup> - Unrestricted assistance with the plugin for those, who bought a copy of the plugin when it was purchasable.  
+<sup>3</sup> - Unlimited access to my free time for everyone in the world.  
+<sup>4</sup> - Improving plugin's performance while not losing out on any features. This was done 
+proactively a lot in the past, so there isn't much to do anymore, only if someone actually finds and reports something.  
+  
+*Instead, you can use [this fresh new community discord](https://discord.gg/YPqXt63YQj) made by a nice person who will provide this service.  

api/build.gradle.kts

@@ -1,28 +1,5 @@
-plugins {
-    id("net.kyori.blossom") version "1.2.0"
-}
-
 dependencies {
-    compileOnlyApi(libs.netty)
-    api(libs.jsonSimple) {
-        exclude("junit", "junit")
-    }
-    compileOnlyApi(libs.snakeyaml)
-    api(libs.yamlAssist)
-    compileOnlyApi(libs.adventureMiniMessage)
-    compileOnlyApi(libs.adventureApi)
-    compileOnlyApi(libs.adventureLegacy)
-    compileOnlyApi(libs.via)
-}
-
-blossom {
-    replaceToken("@name@", rootProject.name)
-    replaceToken("@id@", rootProject.ext.get("id")!!.toString())
-    replaceToken("@version@", project.version)
-    replaceToken("@description@", project.description)
-    replaceToken("@website@", rootProject.ext.get("website")!!.toString())
-    replaceToken("@author@", rootProject.ext.get("author")!!.toString())
-    replaceTokenIn("src/main/java/me/neznamy/tab/api/TabConstants.java")
+    compileOnlyApi("org.jetbrains:annotations:24.1.0")
 }
 
 tasks.javadoc {

api/src/main/java/me/neznamy/tab/api/ArmorStand.java

@@ -1,78 +0,0 @@
-package me.neznamy.tab.api;
-
-/**
- * Interface representing an armor stand attached to player
- * for displaying text in game.
- */
-public interface ArmorStand {
-
-    /**
-     * Returns true if offset is static, false if not
-     *
-     * @return  true if static, false if dynamic
-     */
-    boolean isStaticOffset();
-    
-    /**
-     * Changes offset of the armor stand
-     *
-     * @param   offset
-     *          new offset
-     */
-    void setOffset(double offset);
-
-    /**
-     * Returns offset of the armor stand
-     *
-     * @return  offset from base
-     */
-    double getOffset();
-    
-    /**
-     * Returns property for armor stand's name
-     *
-     * @return  property for armor stand's name
-     */
-    Property getProperty();
-    
-    /**
-     * Teleports armor stand to owner's current location for everyone in range
-     */
-    void teleport();
-    
-    /**
-     * Teleports armor stand to owner's current location for specified player
-     *
-     * @param   viewer
-     *          player to send packet to
-     */
-    void teleport(TabPlayer viewer);
-
-    /**
-     * Updates armor stand's name if needed
-     */
-    void refresh();
-    
-    /**
-     * Updates visibility if needed
-     *
-     * @param   force
-     *          if refresh should be forced
-     */
-    void updateVisibility(boolean force);
-    
-    /**
-     * Returns entity ID of this armor stand
-     *
-     * @return  entity ID of this armor stand
-     */
-    int getEntityId();
-    
-    /**
-     * Spawns armor stand for specified player
-     *
-     * @param   viewer
-     *          player to spawn for
-     */
-    void spawn(TabPlayer viewer);
-}

api/src/main/java/me/neznamy/tab/api/FeatureManager.java

@@ -1,116 +0,0 @@
-package me.neznamy.tab.api;
-
-import java.util.UUID;
-
-/**
- * Feature manager allows registration and work with features.
- */
-public interface FeatureManager {
-
-    /**
-     * Registers a feature, which will start receiving events
-     * 
-     * @param   name
-     *          name of feature
-     * @param   feature
-     *          the handler
-     */
-    void registerFeature(String name, TabFeature feature);
-    
-    /**
-     * Unregisters feature making it no longer receive events. This does not run unload method nor cancel
-     * tasks created by the feature
-     *
-     * @param   name
-     *          feature name defined in registerFeature
-     */
-    void unregisterFeature(String name);
-    
-    /**
-     * Returns whether a feature with said name is registered or not
-     * 
-     * @param   name
-     *          name of feature defined in registerFeature method
-     * @return  true if feature exists, false if not
-     */
-    boolean isFeatureEnabled(String name);
-
-    /**
-     * Returns feature handler by its name
-     * 
-     * @param   name
-     *          name of feature defined in registerFeature method
-     * @return  the feature or null if feature does not exist
-     */
-    TabFeature getFeature(String name);
-
-    /**
-     * Calls onQuit(TabPlayer) to all enabled features
-     *
-     * @param   disconnectedPlayer
-     *          player who disconnected
-     */
-    void onQuit(TabPlayer disconnectedPlayer);
-
-    /**
-     * Calls onJoin(TabPlayer) to all enabled features
-     *
-     * @param   connectedPlayer
-     *          player who connected
-     */
-    void onJoin(TabPlayer connectedPlayer);
-
-    /**
-     * Calls onServerChange(TabPlayer, String, String) to all enabled features
-     *
-     * @param   playerUUID
-     *          player who switched server
-     * @param   to
-     *          name of the new server
-     */
-    void onServerChange(UUID playerUUID, String to);
-
-    /**
-     * Calls onWorldChange(TabPlayer, String, String) to all enabled features
-     *
-     * @param   playerUUID
-     *          player who switched world
-     * @param   to
-     *          name of the new world
-     */
-    void onWorldChange(UUID playerUUID, String to);
-
-    /**
-     * Calls onCommand(TabPlayer, String) to all enabled features
-     *
-     * @param   sender
-     *          command sender
-     * @param   command
-     *          command line including /
-     * @return  {@code true} if some feature marked the command for cancel, {@code false} if not
-     */
-    boolean onCommand(TabPlayer sender, String command);
-
-    /**
-     * Internal function that marks objective packet deserialization
-     * when at least 1 feature uses it.
-     * <p>
-     * Internal use only.
-     */
-    void markObjective();
-
-    /**
-     * Internal function that marks display objective packet deserialization
-     * when at least 1 feature uses it.
-     * <p>
-     * Internal use only.
-     */
-    void markDisplayObjective();
-
-    /**
-     * Returns array of all currently enabled features
-     *
-     * @return  array of all currently enabled features
-     */
-    TabFeature[] getValues();
-}

api/src/main/java/me/neznamy/tab/api/Property.java

@@ -1,68 +0,0 @@
-package me.neznamy.tab.api;
-
-/**
- * An interface representing a property assigned to a player,
- * which may contain placeholders and can be changed using the API.
- */
-public interface Property {
-
-    /**
-     * Returns original raw value ignoring API calls
-     *
-     * @return  original raw value
-     */
-    String getOriginalRawValue();
-
-    /**
-     * Temporarily overrides current raw value with an API call
-     *
-     * @param   temporaryValue
-     *          temporary value to be assigned
-     */
-    void setTemporaryValue(String temporaryValue);
-
-    /**
-     * Returns current temporary value
-     *
-     * @return  temporary value or null if not set
-     */
-    String getTemporaryValue();
-
-    /**
-     * Returns temporary value (via API) if present, raw value otherwise
-     *
-     * @return  current raw value
-     */
-    String getCurrentRawValue();
-
-    /**
-     * Returns last known value
-     *
-     * @return  last known value
-     */
-    String get();
-
-    /**
-     * Replaces all placeholders in current raw value, colorizes it, removes remove-strings and returns whether value changed or not
-     *
-     * @return  if updating changed value or not
-     */
-    boolean update();
-
-    /**
-     * Replaces all placeholders in current raw value, colorizes it, removes remove-strings and returns it.
-     * Equal to calling update() and then get().
-     *
-     * @return  updated value
-     */
-    String updateAndGet();
-
-    /**
-     * Returns value for defined viewer by applying relational placeholders to last known value
-     *
-     * @param   viewer
-     *          the viewer
-     * @return  format for the viewer
-     */
-    String getFormat(TabPlayer viewer);
-}

api/src/main/java/me/neznamy/tab/api/TabAPI.java

@@ -2,13 +2,19 @@ package me.neznamy.tab.api;
 
 import java.util.UUID;
 
+import lombok.NonNull;
+import lombok.Setter;
 import me.neznamy.tab.api.bossbar.BossBarManager;
-import me.neznamy.tab.api.config.ConfigurationFile;
 import me.neznamy.tab.api.event.EventBus;
 import me.neznamy.tab.api.placeholder.PlaceholderManager;
 import me.neznamy.tab.api.scoreboard.ScoreboardManager;
-import me.neznamy.tab.api.task.ThreadManager;
-import me.neznamy.tab.api.team.TeamManager;
+import me.neznamy.tab.api.tablist.SortingManager;
+import me.neznamy.tab.api.tablist.HeaderFooterManager;
+import me.neznamy.tab.api.tablist.TabListFormatManager;
+import me.neznamy.tab.api.nametag.NameTagManager;
+import me.neznamy.tab.api.tablist.layout.LayoutManager;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * The primary API class to get instances of other API classes
@@ -16,14 +22,7 @@ import me.neznamy.tab.api.team.TeamManager;
 public abstract class TabAPI {
 
     /** Instance of the API */
-    private static TabAPI instance;
-
-    /**
-     * Constructs new instance and sets it as new API instance
-     */
-    public TabAPI() {
-        instance = this;
-    }
+    @Setter private static TabAPI instance;
 
     /**
      * Returns API instance. If instance was not set by the plugin, throws
@@ -35,10 +34,10 @@ public abstract class TabAPI {
      * @throws  IllegalStateException
      *          If instance is {@code null}
      */
-    public static TabAPI getInstance() {
+    public static @NotNull TabAPI getInstance() {
         if (instance == null) throw new IllegalStateException("The API instance is null. This can have 2 possible causes: \n" +
                 "#1 - API was called before TAB was loaded. This means your plugin was loaded before TAB was. To make sure your " +
-                "plugin loads after TAB, add it as a depend or softdepend of your plugin.\n" +
+                "plugin loads after TAB, add it as a depend or soft depend of your plugin.\n" +
                 "#2 - You shaded TAB's classes into your plugin, instead of only using them. This is not allowed. To verify this " +
                 "is your case, unzip your plugin and check for TAB's classes. If they are there, you will need to fix your compiler " +
                 "to not include them, such as scope provided for maven compilation.");
@@ -52,7 +51,7 @@ public abstract class TabAPI {
      *          Player UUID
      * @return  player object from given UUID
      */
-    public abstract TabPlayer getPlayer(UUID id);
+    public abstract @Nullable TabPlayer getPlayer(@NonNull UUID id);
 
     /**
      * Returns player object from given name
@@ -61,157 +60,76 @@ public abstract class TabAPI {
      *          Player name
      * @return  player object from given name
      */
-    public abstract TabPlayer getPlayer(String name);
+    public abstract @Nullable TabPlayer getPlayer(@NonNull String name);
 
     /**
      * Returns collection of all online players. Will return empty list if plugin is disabled (due to a broken configuration file for example).
      *
      * @return  collection of online players
      */
-    public abstract TabPlayer[] getOnlinePlayers();
+    public abstract @NotNull TabPlayer[] getOnlinePlayers();
 
     /**
      * Return BossBar manager instance if the feature is enabled. If not, returns {@code null}.
      *
      * @return  BossBar manager
      */
-    public abstract BossBarManager getBossBarManager();
+    public abstract @Nullable BossBarManager getBossBarManager();
 
     /**
      * Returns scoreboard manager instance if the feature is enabled. If not, returns {@code null}.
      *
      * @return  scoreboard manager
      */
-    public abstract ScoreboardManager getScoreboardManager();
+    public abstract @Nullable ScoreboardManager getScoreboardManager();
 
     /**
      * Returns team manager instance if the feature is enabled. If not, returns {@code null}.
      *
      * @return  team manager
      */
-    public abstract TeamManager getTeamManager();
+    public abstract @Nullable NameTagManager getNameTagManager();
 
     /**
      * Returns header/footer manager instance if the feature is enabled. If not, returns {@code null}.
      *
      * @return  Header/footer manager
      */
-    public abstract HeaderFooterManager getHeaderFooterManager();
+    public abstract @Nullable HeaderFooterManager getHeaderFooterManager();
 
     /**
      * Returns PlaceholderManager instance
      *
      * @return  PlaceholderManager instance
      */
-    public abstract PlaceholderManager getPlaceholderManager();
+    public abstract @NotNull PlaceholderManager getPlaceholderManager();
 
     /**
-     * Returns feature manager instance
+     * Returns TabList name format manager instance if the feature is enabled. If not, returns {@code null}.
      *
-     * @return  feature manager instance
+     * @return  TabList name format manager
      */
-    public abstract FeatureManager getFeatureManager();
+    public abstract @Nullable TabListFormatManager getTabListFormatManager();
 
     /**
-     * Returns Tablist name format manager instance if the feature is enabled. If not, returns {@code null}.
+     * Returns Layout manager instance if the feature is enabled. If not, returns {@code null}.
      *
-     * @return  Tablist name format manager
+     * @return  Layout manager
      */
-    public abstract TablistFormatManager getTablistFormatManager();
+    public abstract @Nullable LayoutManager getLayoutManager();
+
+    /**
+     * Returns Sorting manager instance if at least one feature capable of sorting players is enabled.
+     * If not, returns {@code null}.
+     *
+     * @return  Sorting manager
+     */
+    public abstract @Nullable SortingManager getSortingManager();
 
     /**
      * Gets the event bus for registering listeners for TAB events.
      *
      * @return  the event bus
      */
-    public abstract EventBus getEventBus();
-
-    /**
-     * Returns server version. On proxy installation returns PROXY.
-     *
-     * @return  server version
-     */
-    public abstract ProtocolVersion getServerVersion();
-
-    /**
-     * Prints message into console
-     *
-     * @param   message
-     *          message to print
-     * @param   translateColors
-     *          {@code true} if colors should be translated, {@code false} if not
-     */
-    public abstract void sendConsoleMessage(String message, boolean translateColors);
-
-    /**
-     * Returns TAB's Thread manager, which allows task submitting
-     *
-     * @return  ThreadManager instance
-     */
-    public abstract ThreadManager getThreadManager();
-
-    /**
-     * Returns TAB's cache file used to store player toggle data
-     *
-     * @return  TAB's player cache file
-     */
-    public abstract ConfigurationFile getPlayerCache();
-
-    /**
-     * Returns TAB's config.yml file
-     *
-     * @return  config.yml file
-     */
-    public abstract ConfigurationFile getConfig();
-
-    /**
-     * Returns TAB's group configuration
-     *
-     * @return  TAB's group configuration
-     */
-    public abstract PropertyConfiguration getGroups();
-
-    /**
-     * Returns TAB's user configuration
-     *
-     * @return  TAB's user configuration
-     */
-    public abstract PropertyConfiguration getUsers();
-
-    /**
-     * Sends a debug message into console if the option
-     * is enabled in config.
-     *
-     * @param   message
-     *          Message to send
-     */
-    public abstract void debug(String message);
-
-    /**
-     * Logs an error into errors.log file
-     *
-     * @param   message
-     *          Error message
-     * @param   t
-     *          Thrown error
-     */
-    public abstract void logError(String message, Throwable t);
-
-    /**
-     * Sets name of file with syntax error, which prevented
-     * the plugin from enabling. Internal use only.
-     *
-     * @param   file
-     *          Name of file with syntax error
-     */
-    public abstract void setBrokenFile(String file);
-
-    /**
-     * Returns {@code true} if the plugin is currently disabled due to an error,
-     * either a yaml syntax error or an internal startup error. Returns {@code false}
-     * if the plugin is properly running.
-     *
-     * @return  {@code true} if disabled, {@code false} if running correctly
-     */
-    public abstract boolean isPluginDisabled();
+    public abstract @Nullable EventBus getEventBus();
 }

api/src/main/java/me/neznamy/tab/api/TabFeature.java

@@ -1,393 +0,0 @@
-package me.neznamy.tab.api;
-
-import java.util.*;
-
-import lombok.NonNull;
-import me.neznamy.tab.api.protocol.PacketPlayOutPlayerInfo;
-import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardDisplayObjective;
-import me.neznamy.tab.api.protocol.PacketPlayOutScoreboardObjective;
-
-/**
- * Abstract class representing a core feature of the plugin.
- * <p>
- * It receives all kinds of events and can react to them.
- */
-public abstract class TabFeature {
-
-    /** Servers where the feature is disabled (or enabled if using whitelist mode) */
-    protected String[] disabledServers = new String[0];
-
-    /** Flag tracking whether disabled server list is a whitelist or blacklist */
-    private boolean serverWhitelistMode = false;
-
-    /** Worlds where the feature is disabled (or enabled if using whitelist mode) */
-    protected String[] disabledWorlds = new String[0];
-
-    /** Flag tracking whether disabled world list is a whitelist or blacklist */
-    private boolean worldWhitelistMode = false;
-
-    /** Players located in currently disabled worlds / servers */
-    private final Set<TabPlayer> disabledPlayers = Collections.newSetFromMap(new WeakHashMap<>());
-
-    /**
-     * List of methods overridden (implemented) by each feature.
-     * If a method is not overridden, it is not called at all.
-     * This avoids a massive spam for every single method
-     * in every single feature in /tab cpu output
-     */
-    private final List<String> methodOverrides = new ArrayList<>();
-
-    /**
-     * Constructs new instance and loads method overrides
-     */
-    protected TabFeature() {
-        try {
-            if (getClass().getMethod("onCommand", TabPlayer.class, String.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onCommand");
-            if (getClass().getMethod("load").getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("load");
-            if (getClass().getMethod("unload").getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("unload");
-            if (getClass().getMethod("onJoin", TabPlayer.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onJoin");
-            if (getClass().getMethod("onQuit", TabPlayer.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onQuit");
-            if (getClass().getMethod("onWorldChange", TabPlayer.class, String.class, String.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onWorldChange");
-            if (getClass().getMethod("onServerChange", TabPlayer.class, String.class, String.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onServerChange");
-            if (getClass().getMethod("onDisplayObjective", TabPlayer.class, PacketPlayOutScoreboardDisplayObjective.class).getDeclaringClass() != TabFeature.class) {
-                methodOverrides.add("onDisplayObjective");
-                TabAPI.getInstance().getFeatureManager().markDisplayObjective();
-            }
-            if (getClass().getMethod("onLoginPacket", TabPlayer.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onLoginPacket");
-            if (getClass().getMethod("onObjective", TabPlayer.class, PacketPlayOutScoreboardObjective.class).getDeclaringClass() != TabFeature.class) {
-                methodOverrides.add("onObjective");
-                TabAPI.getInstance().getFeatureManager().markObjective();
-            }
-            if (getClass().getMethod("onPlayerInfo", TabPlayer.class, PacketPlayOutPlayerInfo.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onPlayerInfo");
-            if (getClass().getMethod("onPacketReceive", TabPlayer.class, Object.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onPacketReceive");
-            if (getClass().getMethod("onPacketSend", TabPlayer.class, Object.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onPacketSend");
-            if (getClass().getMethod("refresh", TabPlayer.class, boolean.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("refresh");
-            if (getClass().getMethod("onVanishStatusChange", TabPlayer.class).getDeclaringClass() != TabFeature.class)
-                methodOverrides.add("onVanishStatusChange");
-        } catch (NoSuchMethodException e) {
-            //this will never happen
-        }
-    }
-
-    /**
-     * Constructs new instance with given parameters and loads method overrides.
-     * Also loads lists of disabled worlds and servers of this feature with config
-     * section path specified with {@code configSection} parameter.
-     *
-     * @param   configSection
-     *          Configuration section of the feature to load disabled
-     *          servers / worlds from
-     */
-    protected TabFeature(@NonNull String configSection) {
-        this();
-        List<String> disabledServers = TabAPI.getInstance().getConfig().getStringList(configSection + ".disable-in-servers");
-        List<String> disabledWorlds = TabAPI.getInstance().getConfig().getStringList(configSection + ".disable-in-worlds");
-        if (disabledServers != null) {
-            this.disabledServers = disabledServers.toArray(new String[0]);
-            serverWhitelistMode = disabledServers.contains("WHITELIST");
-        }
-        if (disabledWorlds != null) {
-            this.disabledWorlds = disabledWorlds.toArray(new String[0]);
-            worldWhitelistMode = disabledWorlds.contains("WHITELIST");
-        }
-    }
-
-    /**
-     * Loads all online players and sends packets
-     */
-    public void load() {
-        //empty by default
-    }
-
-    /**
-     * Unloads all players and sends clear packets
-     */
-    public void unload() {
-        //empty by default
-    }
-
-    /**
-     * Processes command from player. This is typically a toggle command.
-     *
-     * @param   sender
-     *          command sender
-     * @param   message
-     *          command line
-     * @return  {@code true} if event should be cancelled, {@code true} if not
-     */
-    public boolean onCommand(TabPlayer sender, String message) {
-        return false;
-    }
-
-    /**
-     * Processes join event
-     *
-     * @param   connectedPlayer
-     *          player who connected
-     */
-    public void onJoin(TabPlayer connectedPlayer) {
-        //empty by default
-    }
-
-    /**
-     * Processes quit event
-     *
-     * @param   disconnectedPlayer
-     *          player who disconnected
-     */
-    public void onQuit(TabPlayer disconnectedPlayer) {
-        //empty by default
-    }
-
-    /**
-     * Processes world switch
-     *
-     * @param   changed
-     *          player who switched world
-     * @param   from
-     *          world player changed from
-     * @param   to
-     *          world player changed to
-     */
-    public void onWorldChange(TabPlayer changed, String from, String to) {
-        //empty by default
-    }
-
-    /**
-     * Processes server switch
-     *
-     * @param   changed
-     *          player who switched server
-     * @param   from
-     *          server player changed from
-     * @param   to
-     *          server player changed to
-     */
-    public void onServerChange(TabPlayer changed, String from, String to) {
-        //empty by default
-    }
-
-    /**
-     * Processes the packet send and returns true if packet should be cancelled
-     *
-     * @param   receiver
-     *          player receiving packet
-     * @param   packet
-     *          received packet
-     */
-    public void onDisplayObjective(TabPlayer receiver, PacketPlayOutScoreboardDisplayObjective packet) {
-        //empty by default
-    }
-
-    /**
-     * Processes login packet, only available on BungeeCord
-     *
-     * @param   packetReceiver
-     *          player receiving client reset packet
-     */
-    public void onLoginPacket(TabPlayer packetReceiver) {
-        //empty by default
-    }
-
-    /**
-     * Processes the packet send
-     *
-     * @param   receiver
-     *          player receiving packet
-     * @param   packet
-     *          received packet
-     */
-    public void onObjective(TabPlayer receiver, PacketPlayOutScoreboardObjective packet) {
-        //empty by default
-    }
-
-    /**
-     * Processes the packet send and possibly modifies it
-     *
-     * @param   receiver
-     *          player receiving packet
-     * @param   info
-     *          received packet
-     */
-    public void onPlayerInfo(TabPlayer receiver, PacketPlayOutPlayerInfo info) {
-        //empty by default
-    }
-
-    /**
-     * Processes raw packet sent by client
-     *
-     * @param   sender
-     *          packet sender
-     * @param   packet
-     *          packet received
-     * @return  true if false should be cancelled, false if not
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
-        return false;
-    }
-
-    /**
-     * Processes raw packet sent to client
-     *
-     * @param   receiver
-     *          packet receiver
-     * @param   packet
-     *          the packet
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
-        //empty by default
-    }
-
-    /**
-     * Performs refresh of specified player
-     *
-     * @param   refreshed
-     *          player to refresh
-     * @param   force
-     *          if refresh should be forced despite refresh seemingly not needed
-     */
-    public void refresh(TabPlayer refreshed, boolean force) {
-        //empty by default
-    }
-
-    /**
-     * Processes vanish status change of player
-     *
-     * @param   player
-     *          Player who changed vanish status
-     */
-    public void onVanishStatusChange(TabPlayer player) {
-        //empty by default
-    }
-
-    /**
-     * Registers this feature as one using specified placeholders
-     *
-     * @param   placeholders
-     *          placeholders to add as used in this feature
-     */
-    public void addUsedPlaceholders(Collection<String> placeholders) {
-        if (placeholders.isEmpty()) return;
-        placeholders.forEach(p -> TabAPI.getInstance().getPlaceholderManager().addUsedPlaceholder(p, this));
-    }
-
-    /**
-     * Returns {@code true} if world or server is disabled, {@code false} if not
-     *
-     * @param   server
-     *          server to check
-     * @param   world
-     *          world to check
-     * @return  {@code true} if feature should be disabled, {@code false} if not
-     */
-    public boolean isDisabled(String server, String world) {
-        boolean contains = contains(disabledWorlds, world);
-        if (worldWhitelistMode) contains = !contains;
-        if (contains) return true;
-        contains = contains(disabledServers, server);
-        if (serverWhitelistMode) contains = !contains;
-        return contains;
-    }
-
-    /**
-     * Returns {@code true} if list contains the specified element or element
-     * ends with {@code "*"} and element meeting that requirement is present,
-     * {@code false} otherwise.
-     *
-     * @param   list
-     *          List to check
-     * @param   element
-     *          Element to find
-     * @return  {@code true} if element was found, {@code false} if not
-     */
-    protected boolean contains(String[] list, String element) {
-        if (element == null) return false;
-        for (String s : list) {
-            if (s.endsWith("*")) {
-                if (element.toLowerCase().startsWith(s.substring(0, s.length()-1).toLowerCase())) return true;
-            } else {
-                if (element.equalsIgnoreCase(s)) return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Returns {@code true} if method with specified name is overridden
-     * in the implementation, {@code false} if not
-     *
-     * @param   method
-     *          Method to check
-     * @return  {@code true} if overridden, {@code false} if not
-     */
-    public boolean overridesMethod(String method) {
-        return methodOverrides.contains(method);
-    }
-
-    /**
-     * Returns {@code true} if player is currently located in a server
-     * or world, which is marked as disabled, {@code false} if not
-     *
-     * @param   p
-     *          Player to check
-     * @return  {@code true} if player is in disabled server / world,
-     *          {@code false} if not
-     */
-    public boolean isDisabledPlayer(TabPlayer p) {
-        return disabledPlayers.contains(p);
-    }
-
-    /**
-     * Adds specified player into list of players in disabled
-     * servers / worlds.
-     *
-     * @param   p
-     *          Player to add
-     */
-    public void addDisabledPlayer(TabPlayer p) {
-        if (disabledPlayers.contains(p)) return;
-        disabledPlayers.add(p);
-    }
-
-    /**
-     * Removes specified player from list of players in disabled
-     * servers / worlds
-     *
-     * @param   p
-     *          Player to check
-     */
-    public void removeDisabledPlayer(TabPlayer p) {
-        disabledPlayers.remove(p);
-    }
-
-    /**
-     * Returns display name of {@link #refresh(TabPlayer, boolean)}
-     * called for this feature in /tab cpu
-     *
-     * @return  Display name of refresh function in this feature
-     */
-    public String getRefreshDisplayName() { return null; }
-
-    /**
-     * Returns name of this feature displayed in /tab cpu
-     *
-     * @return  name of this feature display in /tab cpu
-     */
-    public abstract String getFeatureName();
-}

api/src/main/java/me/neznamy/tab/api/TabPlayer.java

@@ -1,158 +1,37 @@
 package me.neznamy.tab.api;
 
-import java.util.UUID;
+import lombok.NonNull;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
-import me.neznamy.tab.api.chat.IChatBaseComponent;
-import me.neznamy.tab.api.protocol.Skin;
-import me.neznamy.tab.api.protocol.TabPacket;
+import java.util.UUID;
 
 /**
  * An interface representing a player
  */
+@SuppressWarnings("unused") // API class
 public interface TabPlayer {
 
-    /**
-     * Refreshes all visuals on the player
-     */
-    void forceRefresh();
-
     /**
      * Returns player's name
      *
      * @return  Player's name
      */
-    String getName();
+    @NotNull String getName();
 
     /**
      * Returns player's UUID
      *
      * @return  Player's UUID
      */
-    UUID getUniqueId();
-
-    /**
-     * Returns player's uuid used in TabList. This may only be different from real uuid if
-     * TAB is installed on a proxy which does not rewrite UUIDs.
-     *
-     * @return  player's uuid in TabList
-     */
-    UUID getTablistId();
-
-    /**
-     * Returns player's protocol version
-     *
-     * @return  player's protocol version
-     */
-    ProtocolVersion getVersion();
+    @NotNull UUID getUniqueId();
 
     /**
      * Returns platform-specific entity
      *
-     * @return  an instance of bukkit/bungee player depending on platform
+     * @return  platform's player object
      */
-    Object getPlayer();
-
-    /**
-     * Returns player's current world name (on BungeeCord this requires bridge installed)
-     *
-     * @return  name of world where player is currently in, "N/A" on BungeeCord if bridge is not installed
-     */
-    String getWorld();
-    
-    /**
-     * Returns player's current server name on BungeeCord (on bukkit this returns "N/A")
-     *
-     * @return  name of server where player is currently in, "N/A" on bukkit
-     */
-    String getServer();
-
-    /**
-     * Performs platform-specific API call to check for permission and returns the result
-     *
-     * @param   permission
-     *          the permission to check for
-     * @return  true if player has permission, false if not
-     */
-    boolean hasPermission(String permission);
-
-    /**
-     * Sends the player a custom universal packet
-     *
-     * @param   packet
-     *          packet to send
-     */
-    void sendCustomPacket(TabPacket packet);
-
-    /**
-     * Sends the player a custom universal packet and adds that packet into counter that
-     * is displayed in /tab cpu
-     *
-     * @param   packet
-     *          packet to send
-     * @param   feature
-     *          feature to increment sent packet counter of
-     */
-    void sendCustomPacket(TabPacket packet, TabFeature feature);
-    
-    /**
-     * Sends the player a custom universal packet and adds that packet into counter that
-     * is displayed in /tab cpu
-     *
-     * @param   packet
-     *          packet to send
-     * @param   feature
-     *          feature to increment sent packet counter of
-     */
-    void sendCustomPacket(TabPacket packet, String feature);
-
-    /**
-     * Sends the player a platform-specific packet
-     *
-     * @param   packet
-     *          an instance of packet depending on platform
-     */
-    void sendPacket(Object packet);
-
-    /**
-     * Returns player's property by name
-     *
-     * @param   name
-     *          name of property
-     * @return  the property or {@code null} if not found
-     */
-    Property getProperty(String name);
-
-    /**
-     * Sends a message to the player
-     *
-     * @param   message
-     *          message to be sent
-     * @param   translateColors
-     *          whether colors should be translated or not
-     */
-    void sendMessage(String message, boolean translateColors);
-
-    /**
-     * Sends specified component as a chat message
-     *
-     * @param   message
-     *          message to send
-     */
-    void sendMessage(IChatBaseComponent message);
-
-    /**
-     * Returns player's ping calculated by server
-     *
-     * @return  player's ping
-     */
-    int getPing();
-
-    /**
-     * Returns player's skin data
-     *
-     * @return  player's skin
-     */
-    Skin getSkin();
+    @NotNull Object getPlayer();
 
     /**
      * Returns true once the player is successfully loaded (onJoin method ran through all methods)
@@ -161,92 +40,6 @@ public interface TabPlayer {
      */
     boolean isLoaded();
 
-    /**
-     * Sets property with specified name to new value. If property did not exist before, it is
-     * created and {@code true} is returned. If it existed, it is overridden and {@code true} is returned.
-     * {@code false} is returned otherwise.
-     *
-     * @param   feature
-     *          feature using this property to get placeholders registered
-     * @param   identifier
-     *          property name
-     * @param   rawValue
-     *          new raw value
-     * @return  {@code true} if value changed / did not exist, {@code false} if value did not change
-     */
-    boolean setProperty(TabFeature feature, String identifier, String rawValue);
-
-    /**
-     * Loads property from config using standard property loading algorithm
-     *
-     * @param   property
-     *          property name to load
-     * @return  {@code true} if value did not exist or changed, {@code false} otherwise
-     */
-    boolean loadPropertyFromConfig(TabFeature feature, String property);
-
-    /**
-     * Loads property from config using standard property loading algorithm. If the property is
-     * not set in config, {@code ifNotSet} value is used.
-     *
-     * @param   property
-     *          property name to load
-     * @param   ifNotSet
-     *          value to use if property is not defined in config
-     * @return  {@code true} if value did not exist or changed, {@code false} otherwise
-     */
-    boolean loadPropertyFromConfig(TabFeature feature, String property, String ifNotSet);
-
-    /**
-     * Returns name of player's scoreboard team or {@code null} if NameTag feature is disabled
-     *
-     * @return  name of player's team
-     */
-    String getTeamName();
-
-    /**
-     * Returns {@code true} if player is disguised using LibsDisguises, {@code false} if not
-     *
-     * @return  {@code true} if player is disguised, {@code false} if not
-     */
-    boolean isDisguised();
-
-    /**
-     * Returns {@code true} if player has invisibility potion, {@code false} if not.
-     * For bukkit, API is used, for BungeeCord, bridge is used.
-     *
-     * @return  {@code true} if player has invisibility potion, {@code false} if not
-     */
-    boolean hasInvisibilityPotion();
-
-    /**
-     * Checks if player is vanished using any supported vanish plugin and returns the result.
-     *
-     * @return  {@code true} if player is vanished, {@code false} if not
-     */
-    boolean isVanished();
-
-    /**
-     * Calls platform-specific method and returns the result
-     *
-     * @return  {@code true} if player is online, {@code false} if not
-     */
-    boolean isOnline();
-    
-    /**
-     * Returns GameMode of the player (0 for survival, 1 creative, 2 adventure, 3 spectator)
-     *
-     * @return  GameMode of the player
-     */
-    int getGamemode();
-
-    /**
-     * Returns {@code true} if this is a bedrock player, {@code false} if not
-     *
-     * @return  {@code true} if player is a bedrock player, {@code false} if not
-     */
-    boolean isBedrockPlayer();
-
     /**
      * Returns player's primary permission group. If group has been changed using
      * {@link #setTemporaryGroup(String)}, returns that value. Otherwise, returns group
@@ -254,45 +47,48 @@ public interface TabPlayer {
      *
      * @return  player's primary permission group
      */
-    String getGroup();
+    @NotNull String getGroup();
 
     /**
      * Temporarily overrides player's group and applies all changes coming from new group.
      * This includes all properties and sorting, if used.
+     * Set to {@code null} to reset back.
      *
      * @param   group
      *          New group to use
      * @see     #hasTemporaryGroup()
-     * @see     #resetTemporaryGroup()
      */
-    void setTemporaryGroup(String group);
+    void setTemporaryGroup(@Nullable String group);
 
     /**
-     * Returns temporary group applied to the player using {@link #setTemporaryGroup(String)}.
-     * If no group was set, returns {@code null}
+     * Returns {@code true} if a temporary group was applied to the player using {@link #setTemporaryGroup(String)}.
+     * If no group was set, returns {@code false}
      *
-     * @return  Temporary group assigned to player or {@code null} if not set
+     * @return  {@code true} if group is set, {@code false} if not
      * @see     #setTemporaryGroup(String)
-     * @see     #resetTemporaryGroup()
      */
     boolean hasTemporaryGroup();
 
     /**
-     * Resets temporary group assigned using {@link #setTemporaryGroup(String)}.
-     * If no temporary group is set, doesn't do anything.
+     * Changes expected profile name of the player. This adapts all name-bound features
+     * to use this new profile name if another plugin changed profile name of the player. <p>
+     * Automatic profile name change detection is available on Bukkit, BungeeCord and Fabric,
+     * therefore using this is redundant there. This function is only needed on Sponge and Velocity,
+     * where the detection is not available. <p>
+     * Warning: This function does NOT change player's profile name, it only updates the tracked
+     * name inside the plugin.
      *
-     * @see     #setTemporaryGroup(String)
-     * @see     #hasTemporaryGroup()
+     * @param   profileName
+     *          New expected profile name
      */
-    void resetTemporaryGroup();
+    void setExpectedProfileName(@NonNull String profileName);
 
     /**
-     * Returns player's game profile name as seen by other players. By default,
-     * this returns player's name. If using a nickname / disguise plugin that changes
-     * game profile name for other players and change was successfully detected, returns
-     * that value.
+     * Returns player's expected profile name. This defaults to player's username, but may
+     * get changed by other plugins and then detected by TAB.
      *
-     * @return  player's game profile name as seen by other players
+     * @return  Player's expected profile name
      */
-    String getNickname();
+    @NotNull
+    String getExpectedProfileName();
 }

api/src/main/java/me/neznamy/tab/api/bossbar/BarColor.java

@@ -4,13 +4,27 @@ package me.neznamy.tab.api.bossbar;
  * An enum representing all available BossBar colors.
  * Calling ordinal() will return color's network ID.
  */
+@SuppressWarnings("unused") // API class
 public enum BarColor {
 
+    /** Pink color */
     PINK,
+
+    /** Blue color */
     BLUE,
+
+    /** Red color */
     RED,
+
+    /** Green color */
     GREEN,
+
+    /** Yellow color */
     YELLOW,
+
+    /** Purple color */
     PURPLE,
+
+    /** White color */
     WHITE
 }

api/src/main/java/me/neznamy/tab/api/bossbar/BarStyle.java

@@ -1,22 +1,24 @@
 package me.neznamy.tab.api.bossbar;
 
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-
 /**
  * An enum representing all available BossBar styles.
  * Calling ordinal() will return style's network ID.
- * Style names are equal to NMS names.
  */
-@AllArgsConstructor
+@SuppressWarnings("unused") // API class
 public enum BarStyle {
 
-    PROGRESS("SOLID"),
-    NOTCHED_6("SEGMENTED_6"),
-    NOTCHED_10("SEGMENTED_10"),
-    NOTCHED_12("SEGMENTED_12"),
-    NOTCHED_20("SEGMENTED_20");
+    /** Fully solid line */
+    PROGRESS,
 
-    /** Style's name used in Bukkit API */
-    @Getter private final String bukkitName;
+    /** Line segmented into 6 parts */
+    NOTCHED_6,
+
+    /** Line segmented into 10 parts */
+    NOTCHED_10,
+
+    /** Line segmented into 12 parts */
+    NOTCHED_12,
+
+    /** Line segmented into 20 parts */
+    NOTCHED_20
 }

api/src/main/java/me/neznamy/tab/api/bossbar/BossBar.java

@@ -3,7 +3,9 @@ package me.neznamy.tab.api.bossbar;
 import java.util.List;
 import java.util.UUID;
 
+import lombok.NonNull;
 import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * An interface representing a BossBar line.
@@ -26,7 +28,7 @@ public interface BossBar {
      *
      * @return  name of BossBar
      */
-    String getName();
+    @NotNull String getName();
 
     /**
      * Returns randomly generated uuid of this BossBar used internally to match
@@ -34,7 +36,7 @@ public interface BossBar {
      *
      * @return  uuid of this BossBar
      */
-    UUID getUniqueId();
+    @NotNull UUID getUniqueId();
 
     /**
      * Changes BossBar title to specified string, supporting placeholders.
@@ -48,7 +50,7 @@ public interface BossBar {
      * @param   title
      *          New title to display in this BossBar
      */
-    void setTitle(String title);
+    void setTitle(@NonNull String title);
 
     /**
      * Changes BossBar progress to specified string, supporting placeholders.
@@ -64,7 +66,7 @@ public interface BossBar {
      * @param   progress
      *          New progress to use in this BossBar
      */
-    void setProgress(String progress);
+    void setProgress(@NonNull String progress);
 
     /**
      * Changes BossBar progress to specified value ranging from 0 to 100.
@@ -90,7 +92,7 @@ public interface BossBar {
      * @param   color
      *          New color to use in this BossBar
      */
-    void setColor(String color);
+    void setColor(@NonNull String color);
 
     /**
      * Changes BossBar color to specified enum constant.
@@ -100,7 +102,7 @@ public interface BossBar {
      * @param   color
      *          New color to use in this BossBar
      */
-    void setColor(BarColor color);
+    void setColor(@NonNull BarColor color);
 
     /**
      * Changes BossBar style to specified string, supporting placeholders.
@@ -116,7 +118,7 @@ public interface BossBar {
      * @param   style
      *          New style to use in this BossBar
      */
-    void setStyle(String style);
+    void setStyle(@NonNull String style);
 
     /**
      * Changes BossBar style to specified enum constant.
@@ -126,7 +128,7 @@ public interface BossBar {
      * @param   style
      *          New style to use in this BossBar
      */
-    void setStyle(BarStyle style);
+    void setStyle(@NonNull BarStyle style);
 
     /**
      * Returns current title of the BossBar in raw format. If it contains placeholders,
@@ -134,7 +136,7 @@ public interface BossBar {
      *
      * @return  title of the BossBar
      */
-    String getTitle();
+    @NotNull String getTitle();
 
     /**
      * Returns progress of the BossBar as a string, which is either entered string
@@ -142,7 +144,7 @@ public interface BossBar {
      *
      * @return  entered progress as a string
      */
-    String getProgress();
+    @NotNull String getProgress();
 
     /**
      * Returns color of the BossBar as a string, which is either entered string
@@ -150,7 +152,7 @@ public interface BossBar {
      *
      * @return  entered color as a string
      */
-    String getColor();
+    @NotNull String getColor();
 
     /**
      * Returns style of the BossBar as a string, which is either entered string
@@ -158,7 +160,7 @@ public interface BossBar {
      *
      * @return  entered style as a string
      */
-    String getStyle();
+    @NotNull String getStyle();
 
     /**
      * Registers this BossBar to specified player.
@@ -168,7 +170,7 @@ public interface BossBar {
      * @param   player
      *          Player to register this BossBar to
      */
-    void addPlayer(TabPlayer player);
+    void addPlayer(@NonNull TabPlayer player);
 
     /**
      * Unregisters this BossBar from specified player.
@@ -178,7 +180,7 @@ public interface BossBar {
      * @param   player
      *          Player to unregister this BossBar from
      */
-    void removePlayer(TabPlayer player);
+    void removePlayer(@NonNull TabPlayer player);
 
     /**
      * Returns list of players who can see this BossBar.
@@ -189,19 +191,24 @@ public interface BossBar {
      *
      * @return  List of players seeing this BossBar
      */
-    List<TabPlayer> getPlayers();
+    @NotNull List<TabPlayer> getPlayers();
 
     /**
-     * Returns {@code true} if specified player can see this BossBar, {@code false} if not
+     * Returns {@code true} if this bossbar is visible to specified player based on
+     * display condition or adding via {@link #addPlayer(TabPlayer)}, {@code false} if not.
+     * <p>
+     * This may return {@code true} even if player cannot physically see the bossbar due to
+     * having it disabled via toggle command or {@link BossBarManager#toggleBossBar(TabPlayer, boolean)}
+     * (or {@link BossBarManager#setBossBarVisible(TabPlayer, boolean, boolean)}).
      *
      * @param   player
-     *          Player to check for
-     * @return  {@code true} if contains, {@code false} if not
+     *          Player to check
+     * @return  {@code true} if player is allowed to see this Boss Bar, {@code false} if not.
      */
     boolean containsPlayer(TabPlayer player);
 
     /**
-     * Returns {@code true} if this bossbar in configured as announcement-only bar,
+     * Returns {@code true} if this boss bar is configured as announcement-only bar,
      * {@code false} if not.
      *
      * @return  {@code true} if bar is announcement only, {@code false} if not

api/src/main/java/me/neznamy/tab/api/bossbar/BossBarManager.java

@@ -2,10 +2,12 @@ package me.neznamy.tab.api.bossbar;
 
 import java.util.List;
 import java.util.Map;
-import java.util.UUID;
 
+import lombok.NonNull;
 import me.neznamy.tab.api.TabAPI;
 import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * An interface allowing work with BossBars such as creating, sending
@@ -15,6 +17,7 @@ import me.neznamy.tab.api.TabPlayer;
  * This requires the BossBar feature to be enabled in config, otherwise the method will
  * return {@code null}.
  */
+@SuppressWarnings("unused") // API class
 public interface BossBarManager {
 
     /**
@@ -31,7 +34,7 @@ public interface BossBarManager {
      *          Style to use
      * @return  The newly created BossBar
      */
-    BossBar createBossBar(String title, float progress, BarColor color, BarStyle style);
+    @NotNull BossBar createBossBar(@NonNull String title, float progress, @NonNull BarColor color, @NonNull BarStyle style);
 
     /**
      * Creates BossBar with specified parameters and registers it to BossBar manager,
@@ -50,30 +53,19 @@ public interface BossBarManager {
      *          a placeholder that returns one of them
      * @return  The newly created BossBar
      */
-    BossBar createBossBar(String title, String progress, String color, String style);
+    @NotNull BossBar createBossBar(@NonNull String title, @NonNull String progress, @NonNull String color, @NonNull String style);
 
     /**
      * Returns registered BossBar with given name. For BossBars from config it is the name
      * they were created with, for API BossBars their randomly generated name, which can be
      * retrieved using {@link me.neznamy.tab.api.bossbar.BossBar#getName()}.
-     * Returns null if no such BossBar exists.
+     * Returns {@code null} if no such BossBar exists.
      * 
      * @param   name
      *          Name of registered BossBar
      * @return  BossBar with specified name
      */
-    BossBar getBossBar(String name);
-
-    /**
-     * Returns registered BossBar with specified UUID. This UUID is randomly generated when
-     * BossBar is created and used in packets / to match which the one from Bukkit API.
-     * Returns null if no such BossBar exists.
-     * 
-     * @param   id
-     *          UUID to return BossBar by
-     * @return  BossBar with specified uuid
-     */
-    BossBar getBossBar(UUID id);
+    @Nullable BossBar getBossBar(@NonNull String name);
 
     /**
      * Returns a map of all registered BossBars. This includes both BossBars from config
@@ -84,7 +76,7 @@ public interface BossBarManager {
      *
      * @return  all registered BossBars
      */
-    Map<String, BossBar> getRegisteredBossBars();
+    @NotNull Map<String, BossBar> getRegisteredBossBars();
 
     /**
      * Toggles BossBar for this player and sends toggle message if {@code sendToggleMessage} is true.
@@ -96,7 +88,7 @@ public interface BossBarManager {
      * @see     #hasBossBarVisible(TabPlayer)
      * @see     #setBossBarVisible(TabPlayer, boolean, boolean)
      */
-    void toggleBossBar(TabPlayer player, boolean sendToggleMessage);
+    void toggleBossBar(@NonNull TabPlayer player, boolean sendToggleMessage);
 
     /**
      * Returns true if player can see BossBars, false if toggled via command or API.
@@ -107,7 +99,7 @@ public interface BossBarManager {
      * @see     #toggleBossBar(TabPlayer, boolean)
      * @see     #setBossBarVisible(TabPlayer, boolean, boolean)
      */
-    boolean hasBossBarVisible(TabPlayer player);
+    boolean hasBossBarVisible(@NonNull TabPlayer player);
 
     /**
      * Sets BossBar visibility of player to set value. If value did not change, nothing happens.
@@ -122,7 +114,7 @@ public interface BossBarManager {
      * @see #toggleBossBar(TabPlayer, boolean)
      * @see #hasBossBarVisible(TabPlayer)
      */
-    void setBossBarVisible(TabPlayer player, boolean visible, boolean sendToggleMessage);
+    void setBossBarVisible(@NonNull TabPlayer player, boolean visible, boolean sendToggleMessage);
 
     /**
      * Temporarily displays registered BossBar to player for specified amount of time in milliseconds.
@@ -138,7 +130,7 @@ public interface BossBarManager {
      * @see     #announceBossBar(String, int)
      * @see     #getAnnouncedBossBars()
      */
-    void sendBossBarTemporarily(TabPlayer player, String bossBar, int duration);
+    void sendBossBarTemporarily(@NonNull TabPlayer player, @NonNull String bossBar, int duration);
 
     /**
      * Temporarily displays registered BossBar to all players for specified amount of time in milliseconds.
@@ -152,7 +144,7 @@ public interface BossBarManager {
      * @see     #sendBossBarTemporarily(TabPlayer, String, int)
      * @see     #getAnnouncedBossBars()
      */
-    void announceBossBar(String bossBar, int duration);
+    void announceBossBar(@NonNull String bossBar, int duration);
 
     /**
      * Returns list of BossBars which are currently being announced.
@@ -161,5 +153,5 @@ public interface BossBarManager {
      * @see     #sendBossBarTemporarily(TabPlayer, String, int)
      * @see     #announceBossBar(String, int)
      */
-    List<BossBar> getAnnouncedBossBars();
+    @NotNull List<BossBar> getAnnouncedBossBars();
 }

api/src/main/java/me/neznamy/tab/api/chat/ChatClickable.java

@@ -1,29 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.Data;
-import lombok.NonNull;
-
-/**
- * Class for click event action in chat component
- */
-@Data
-public class ChatClickable {
-
-    /** Click action */
-    @NonNull private final EnumClickAction action;
-
-    /** Click value */
-    @NonNull private final String value;
-
-    /**
-     * Enum for all possible click actions
-     */
-    public enum EnumClickAction {
-
-        OPEN_URL,
-        RUN_COMMAND,
-        CHANGE_PAGE, //since 1.8
-        SUGGEST_COMMAND,
-        COPY_TO_CLIPBOARD //since 1.15
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/ChatComponentEntity.java

@@ -1,35 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.NonNull;
-import me.neznamy.tab.api.TabAPI;
-
-import java.util.UUID;
-
-public class ChatComponentEntity extends IChatBaseComponent {
-
-    private final String CONTENTS;
-    private final String VALUE_1_13;
-    private final String VALUE_1_12;
-    private final String VALUE_1_8;
-
-    public ChatComponentEntity(@NonNull String type, @NonNull UUID id, String name) {
-        this.CONTENTS = String.format("{\"type\":\"%s\",\"id\":\"%s\",\"name\":{\"text\":\"%s\"}}", type, id, name);
-        this.VALUE_1_13 = String.format("{type:\"%s\",id:\"%s\",name:\"{\\\"text\\\":\\\"%s\\\"}\"}", type, id, name);
-        this.VALUE_1_12 = String.format("{type:\"%s\",id:\"%s\",name:\"%s\"}", type, id, name);
-        this.VALUE_1_8 = String.format("{type:%s,id:%s,name:%s}", type, id, name);
-    }
-
-    @Override
-    public String toRawText() {
-        return toString();
-    }
-    
-    @Override
-    public String toString() {
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 16) return CONTENTS;
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 13) return VALUE_1_13;
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() == 12) return VALUE_1_12;
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 8) return VALUE_1_8;
-        throw new IllegalStateException("show_entity hover action is not supported on <1.8");
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/ChatHoverable.java

@@ -1,32 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.Getter;
-import lombok.NonNull;
-
-/**
- * Class for hover event action in chat component
- */
-@Data
-public class ChatHoverable {
-
-    /** Hover action */
-    @NonNull private final EnumHoverAction action;
-
-    /** Hover value */
-    @NonNull private final IChatBaseComponent value;
-
-    /**
-     * Enum for all possible hover actions
-     */
-    @AllArgsConstructor
-    public enum EnumHoverAction {
-
-        SHOW_TEXT("contents"),
-        SHOW_ITEM("value"),
-        SHOW_ENTITY("contents");
-
-        @Getter private final String preferredKey;
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/ChatModifier.java

@@ -1,219 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.Data;
-import lombok.NoArgsConstructor;
-import lombok.NonNull;
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.chat.ChatClickable.EnumClickAction;
-import me.neznamy.tab.api.chat.ChatHoverable.EnumHoverAction;
-import org.json.simple.JSONObject;
-
-import java.util.UUID;
-
-@Data @NoArgsConstructor
-public class ChatModifier {
-
-    private TextColor color;
-    private Boolean bold;
-    private Boolean italic;
-    private Boolean underlined;
-    private Boolean strikethrough;
-    private Boolean obfuscated;
-    private ChatClickable clickEvent;
-    private ChatHoverable hoverEvent;
-    private String font;
-    private ProtocolVersion targetVersion;
-
-    public ChatModifier(@NonNull ChatModifier modifier) {
-        this.color = modifier.color == null ? null : new TextColor(modifier.color);
-        this.bold = modifier.bold;
-        this.italic = modifier.italic;
-        this.underlined = modifier.underlined;
-        this.strikethrough = modifier.strikethrough;
-        this.obfuscated = modifier.obfuscated;
-        this.clickEvent = modifier.clickEvent == null ? null : new ChatClickable(modifier.clickEvent.getAction(), modifier.clickEvent.getValue());
-        this.hoverEvent = modifier.hoverEvent == null ? null : new ChatHoverable(modifier.hoverEvent.getAction(), modifier.hoverEvent.getValue());
-        this.font = modifier.font;
-        this.targetVersion = modifier.targetVersion;
-    }
-
-
-    /**
-     * Returns true if bold is defined and set to true, false otherwise
-     *
-     * @return  true if bold is defined and set to true, false otherwise
-     */
-    public boolean isBold() {
-        return Boolean.TRUE.equals(bold);
-    }
-
-    /**
-     * Returns true if italic is defined and set to true, false otherwise
-     *
-     * @return  true if italic is defined and set to true, false otherwise
-     */
-    public boolean isItalic() {
-        return Boolean.TRUE.equals(italic);
-    }
-
-    /**
-     * Returns true if underlined is defined and set to true, false otherwise
-     *
-     * @return  true if underlined is defined and set to true, false otherwise
-     */
-    public boolean isUnderlined() {
-        return Boolean.TRUE.equals(underlined);
-    }
-
-    /**
-     * Returns true if strikethrough is defined and set to true, false otherwise
-     *
-     * @return  true if strikethrough is defined and set to true, false otherwise
-     */
-    public boolean isStrikethrough() {
-        return Boolean.TRUE.equals(strikethrough);
-    }
-
-    /**
-     * Returns true if obfuscation is defined and set to true, false otherwise
-     *
-     * @return  true if obfuscation is defined and set to true, false otherwise
-     */
-    public boolean isObfuscated() {
-        return Boolean.TRUE.equals(obfuscated);
-    }
-
-    /**
-     * Sets click action to OPEN_URL and url to given value
-     *
-     * @param   url
-     *          url to open
-     */
-    public void onClickOpenUrl(@NonNull String url) {
-        clickEvent = new ChatClickable(EnumClickAction.OPEN_URL, url);
-    }
-
-    /**
-     * Sets click action to RUN_COMMAND and command to given value
-     *
-     * @param   command
-     *          command to perform, might be without / to send a chat message
-     */
-    public void onClickRunCommand(@NonNull String command) {
-        clickEvent = new ChatClickable(EnumClickAction.RUN_COMMAND, command);
-    }
-
-    /**
-     * Sets click action to SUGGEST_COMMAND and command to given value
-     *
-     * @param   command
-     *          command to suggest
-     */
-    public void onClickSuggestCommand(@NonNull String command) {
-        clickEvent = new ChatClickable(EnumClickAction.SUGGEST_COMMAND, command);
-    }
-
-    /**
-     * Sets click action to CHANGE_PAGE and page id to given value
-     *
-     * @param   newPage
-     *          id of new page
-     */
-    public void onClickChangePage(int newPage) {
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() < 8) throw new UnsupportedOperationException("change_page click action is not supported on <1.8");
-        clickEvent = new ChatClickable(EnumClickAction.CHANGE_PAGE, String.valueOf(newPage));
-    }
-
-    /**
-     * Sets click action to COPY_TO_CLIPBOARD and text to provided value
-     *
-     * @param   text
-     *          text to copy to clipboard on click
-     */
-    public void onClickCopyToClipBoard(@NonNull String text) {
-        clickEvent = new ChatClickable(EnumClickAction.COPY_TO_CLIPBOARD, text);
-    }
-
-    public void onClick(@NonNull EnumClickAction action, @NonNull String value) {
-        clickEvent = new ChatClickable(action, value);
-    }
-
-    /**
-     * Sets hover action to SHOW_TEXT and text to given value
-     *
-     * @param   text
-     *          text to show
-     */
-    public void onHoverShowText(@NonNull IChatBaseComponent text) {
-        hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_TEXT, text);
-    }
-
-    /**
-     * Sets hover action to SHOW_ITEM and item to given value
-     *
-     * @param   serializedItem
-     *          item to show
-     */
-    public void onHoverShowItem(@NonNull String serializedItem) {
-        hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ITEM, new IChatBaseComponent(serializedItem));
-    }
-
-    /**
-     * Sets hover action to SHOW_ENTITY and entity data to given values
-     *
-     * @param   type
-     *          entity type
-     * @param   id
-     *          entity uuid
-     * @param   name
-     *          entity custom name
-     */
-    public void onHoverShowEntity(@NonNull String type, @NonNull UUID id, String name) {
-        hoverEvent = new ChatHoverable(EnumHoverAction.SHOW_ENTITY, new ChatComponentEntity(type, id, name));
-    }
-
-    public void onHover(@NonNull EnumHoverAction action, @NonNull IChatBaseComponent value) {
-        hoverEvent = new ChatHoverable(action, value);
-    }
-
-    @SuppressWarnings("unchecked")
-    public JSONObject serialize() {
-        JSONObject json = new JSONObject();
-        if (color != null) json.put("color", targetVersion.getMinorVersion() >= 16 ? color.toString() : color.getLegacyColor().toString().toLowerCase());
-        if (bold != null) json.put("bold", bold);
-        if (italic != null) json.put("italic", italic);
-        if (underlined != null) json.put("underlined", underlined);
-        if (strikethrough != null) json.put("strikethrough", strikethrough);
-        if (obfuscated != null) json.put("obfuscated", obfuscated);
-        if (clickEvent != null) {
-            JSONObject click = new JSONObject();
-            click.put("action", clickEvent.getAction().toString().toLowerCase());
-            click.put("value", clickEvent.getValue());
-            json.put("clickEvent", click);
-        }
-        if (hoverEvent != null) {
-            JSONObject hover = new JSONObject();
-            hover.put("action", hoverEvent.getAction().toString().toLowerCase());
-            if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 16) {
-                hover.put(hoverEvent.getAction().getPreferredKey(), hoverEvent.getValue());
-            } else {
-                hover.put("value", TabAPI.getInstance().getServerVersion().getMinorVersion() >= 9 ?
-                        hoverEvent.getValue() : hoverEvent.getValue().toRawText());
-            }
-            json.put("hoverEvent", hover);
-        }
-        if (font != null) json.put("font", font);
-        return json;
-    }
-
-    public String getMagicCodes() {
-        StringBuilder builder = new StringBuilder();
-        if (isBold()) builder.append(EnumChatFormat.BOLD.getFormat());
-        if (isItalic()) builder.append(EnumChatFormat.ITALIC.getFormat());
-        if (isUnderlined()) builder.append(EnumChatFormat.UNDERLINE.getFormat());
-        if (isStrikethrough()) builder.append(EnumChatFormat.STRIKETHROUGH.getFormat());
-        if (isObfuscated()) builder.append(EnumChatFormat.OBFUSCATED.getFormat());
-        return builder.toString();
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/DeserializedChatComponent.java

@@ -1,161 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.NonNull;
-import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.TabAPI;
-import org.jetbrains.annotations.NotNull;
-import org.json.simple.JSONObject;
-import org.json.simple.parser.JSONParser;
-import org.json.simple.parser.ParseException;
-
-import java.util.List;
-
-/**
- * A class representing a chat component that was serialized before,
- * but deserialize was requested in PacketPlayOutPlayerInfo packet.
- * This is used to read and modify the packet and then rewrite it.
- * However, display name components must be deserialized to properly
- * forward them in the new packet, but its value is not actually
- * used anywhere.
- * <p>
- * To avoid this heavy and completely unnecessary operation, the original
- * string is saved and returned during serialization. If any read/write
- * operation is performed, the string is fully deserialized and this object
- * will act like a normal chat component.
- */
-@SuppressWarnings("unchecked")
-@RequiredArgsConstructor
-public class DeserializedChatComponent extends IChatBaseComponent {
-
-    /** The original serialized component string */
-    @NonNull private final String json;
-
-    /**
-     * Flag tracking whether this component was fully deserialized
-     * in case of a read operation to avoid repeating the deserialization
-     * process on every request.
-     */
-    private boolean deserialized;
-
-    /**
-     * Flag tracking whether this component was modified, which means
-     * a new string has to be created instead of returning the input one.
-     */
-    private boolean modified;
-
-    @Override
-    public String toString() {
-        if (modified) return super.toString();
-        return json;
-    }
-
-    @Override
-    public String toString(ProtocolVersion clientVersion) {
-        if (modified) return super.toString(clientVersion);
-        return json;
-    }
-
-    @Override
-    public List<IChatBaseComponent> getExtra() {
-        if (!deserialized) deserialize();
-        return super.getExtra();
-    }
-
-    @Override
-    public String getText() {
-        if (!deserialized) deserialize();
-        return super.getText();
-    }
-
-    @Override
-    public @NotNull ChatModifier getModifier() {
-        if (!deserialized) deserialize();
-        return super.getModifier();
-    }
-
-    @Override
-    public IChatBaseComponent setExtra(List<IChatBaseComponent> components) {
-        if (!deserialized) deserialize();
-        modified = true;
-        return super.setExtra(components);
-    }
-
-    @Override
-    public void addExtra(@NotNull IChatBaseComponent child) {
-        if (!deserialized) deserialize();
-        modified = true;
-        super.addExtra(child);
-    }
-
-    @Override
-    public void setModifier(@NotNull ChatModifier modifier) {
-        if (!deserialized) deserialize();
-        modified = true;
-        super.setModifier(modifier);
-    }
-
-    /**
-     * Performs a full deserialization process on this component.
-     */
-    void deserialize() {
-        deserialized = true;
-        if (json.startsWith("\"") && json.endsWith("\"") && json.length() > 1) {
-            //simple component with only text used, minecraft serializer outputs the text in quotes instead of full json
-            setText(json.substring(1, json.length()-1));
-            return;
-        }
-        JSONObject jsonObject;
-        try {
-            jsonObject = (JSONObject) new JSONParser().parse(json);
-        } catch (ParseException e) {
-            TabAPI.getInstance().logError("Failed to deserialize json component " + json, e);
-            return;
-        }
- /*       if (jsonObject.containsKey("type")) {
-            return new ChatComponentEntity((String) jsonObject.get("type"), UUID.fromString((String) jsonObject.get("id")), IChatBaseComponent.deserialize(jsonObject.get("name").toString()).toFlatText());
-        }*/
-        setText((String) jsonObject.get("text"));
-        getModifier().setBold(getBoolean(jsonObject, "bold"));
-        getModifier().setItalic(getBoolean(jsonObject, "italic"));
-        getModifier().setUnderlined(getBoolean(jsonObject, "underlined"));
-        getModifier().setStrikethrough(getBoolean(jsonObject, "strikethrough"));
-        getModifier().setObfuscated(getBoolean(jsonObject, "obfuscated"));
-        getModifier().setColor(TextColor.fromString(((String) jsonObject.get("color"))));
-        if (jsonObject.containsKey("clickEvent")) {
-            JSONObject clickEvent = (JSONObject) jsonObject.get("clickEvent");
-            String action = (String) clickEvent.get("action");
-            String value = clickEvent.get("value").toString();
-            getModifier().onClick(ChatClickable.EnumClickAction.valueOf(action.toUpperCase()), value);
-        }
-        if (jsonObject.containsKey("hoverEvent")) {
-            JSONObject hoverEvent = (JSONObject) jsonObject.get("hoverEvent");
-            String action = (String) hoverEvent.get("action");
-            String value = (String) hoverEvent.get("value");
-            getModifier().onHover(ChatHoverable.EnumHoverAction.valueOf(action.toUpperCase()), deserialize(value));
-        }
-        if (jsonObject.containsKey("extra")) {
-            List<Object> list = (List<Object>) jsonObject.get("extra");
-            for (Object extra : list) {
-                String string = extra.toString();
-                //reverting .toString() removing "" for simple text
-                if (!string.startsWith("{")) string = "\"" + string + "\"";
-                addExtra(IChatBaseComponent.deserialize(string));
-            }
-        }
-    }
-
-    /**
-     * Returns boolean value of requested key from map
-     *
-     * @param   jsonObject
-     *          map to get value from
-     * @param   key
-     *          name of key
-     * @return  value from json object or null if not present
-     */
-    private static Boolean getBoolean(@NonNull JSONObject jsonObject, @NonNull String key) {
-        String value = String.valueOf(jsonObject.getOrDefault(key, null));
-        return "null".equals(value) ? null : Boolean.parseBoolean(value);
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/IChatBaseComponent.java

@@ -1,373 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-import lombok.NonNull;
-import lombok.Setter;
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.chat.rgb.RGBUtils;
-import me.neznamy.tab.api.util.ComponentCache;
-import org.json.simple.JSONObject;
-
-import java.util.*;
-
-/**
- * A class representing the n.m.s.IChatBaseComponent class to make work with it much easier
- */
-@SuppressWarnings("unchecked")
-@NoArgsConstructor
-public class IChatBaseComponent {
-
-    /**
-     * Component cache maps to avoid large memory allocations as well as
-     * higher CPU usage when using animations which send the same text on repeat.
-     */
-    private static final ComponentCache<String, IChatBaseComponent> stringCache = new ComponentCache<>(10000, (text, clientVersion) -> {
-                return text.contains("#") || text.contains("&x") || text.contains(EnumChatFormat.COLOR_CHAR + "x") || text.contains("<") ?
-                    IChatBaseComponent.fromColoredText(text) : //contains RGB colors
-                    new IChatBaseComponent(text); //no RGB
-            });
-    private static final ComponentCache<IChatBaseComponent, String> serializeCache = new ComponentCache<>(10000,
-            (component, clientVersion) -> component.toString());
-
-    /** Text of the component */
-    @Getter @Setter private String text;
-
-    /** Chat modifier containing color, magic codes, hover and click event */
-    @Getter @Setter @NonNull private ChatModifier modifier = new ChatModifier();
-
-    /** Extra components used in "extra" field */
-    private List<IChatBaseComponent> extra;
-
-    /**
-     * Constructs a new component which is a clone of provided component
-     *
-     * @param   component
-     *          component to clone
-     */
-    public IChatBaseComponent(@NonNull IChatBaseComponent component) {
-        this.text = component.text;
-        this.modifier = new ChatModifier(component.modifier);
-        for (IChatBaseComponent child : component.getExtra()) {
-            addExtra(new IChatBaseComponent(child));
-        }
-    }
-
-    /**
-     * Constructs new instance with given text
-     *
-     * @param   text
-     *          text to display
-     */
-    public IChatBaseComponent(String text) {
-        this.text = text;
-    }
-
-    /**
-     * Returns list of extra components. If no extra components are defined, returns empty list.
-     *
-     * @return  list of extra components
-     */
-    public List<IChatBaseComponent> getExtra() {
-        if (extra == null) return Collections.emptyList();
-        return extra;
-    }
-
-    /**
-     * Sets full list of extra components to given list. Does not allow empty list.
-     *
-     * @param   components
-     *          components to use as extra
-     * @return  self
-     * @throws  IllegalArgumentException
-     *          if {@code components} is an empty list
-     */
-    public IChatBaseComponent setExtra(List<IChatBaseComponent> components) {
-        if (components.isEmpty()) throw new IllegalArgumentException("Unexpected empty array of components"); //exception taken from minecraft
-        this.extra = components;
-        return this;
-    }
-
-    /**
-     * Appends provided component as extra component
-     *
-     * @param   child
-     *          component to append
-     */
-    public void addExtra(@NonNull IChatBaseComponent child) {
-        if (extra == null) extra = new ArrayList<>();
-        extra.add(child);
-    }
-
-    /**
-     * Deserializes string and returns created component. If provided string is null, returns null.
-     *
-     * @param   json
-     *          serialized string
-     * @return  Deserialized component or null if input is null
-     */
-    public static IChatBaseComponent deserialize(String json) {
-        if (json == null) return null;
-        return new DeserializedChatComponent(json);
-    }
-
-    /**
-     * Converts the component to a string representing the serialized component.
-     * This method is only used internally by json library since it's missing
-     * protocol version field used by the method.
-     *
-     * @return  serialized component in string form
-     * @see     #toString(ProtocolVersion)
-     */
-    @Override
-    public String toString() {
-        JSONObject json = new JSONObject();
-        if (text != null) json.put("text", text);
-        if (modifier.getTargetVersion() == null) modifier.setTargetVersion(TabAPI.getInstance().getServerVersion()); //packet.toString() was called as a part of a debug message
-        json.putAll(modifier.serialize());
-        if (extra != null) json.put("extra", extra);
-        return json.toString();
-    }
-
-    /**
-     * Serializes this component with colors based on client version.
-     * If client version is &lt;1.16, HEX colors will be converted to legacy colors.
-     *
-     * @param   clientVersion
-     *          client version to adapt component for
-     * @return  serialized string
-     */
-    public String toString(ProtocolVersion clientVersion) {
-        return toString(clientVersion, false);
-    }
-
-    /**
-     * Serializes this component with colors based on client version.
-     * If client version is &lt;1.16, HEX colors will be converted to legacy colors.
-     *
-     * @param   clientVersion
-     *          client version to adapt component for
-     * @param   sendTranslatableIfEmpty
-     *          whether empty translatable should be sent if text is empty or not
-     * @return  serialized string
-     */
-    public String toString(ProtocolVersion clientVersion, boolean sendTranslatableIfEmpty) {
-        if (extra == null) {
-            if (text == null) return null;
-            if (text.length() == 0) {
-                if (sendTranslatableIfEmpty) {
-                    return "{\"translate\":\"\"}";
-                } else {
-                    return "{\"text\":\"\"}";
-                }
-            }
-        }
-        modifier.setTargetVersion(clientVersion);
-        for (IChatBaseComponent child : getExtra()) {
-            child.modifier.setTargetVersion(clientVersion);
-        }
-        return serializeCache.get(this, clientVersion);
-    }
-
-    /**
-     * Returns organized component from colored text
-     *
-     * @param   originalText
-     *          text to convert
-     * @return  organized component from colored text
-     */
-    public static IChatBaseComponent fromColoredText(@NonNull String originalText) {
-        String text = RGBUtils.getInstance().applyFormats(EnumChatFormat.color(originalText));
-        List<IChatBaseComponent> components = new ArrayList<>();
-        StringBuilder builder = new StringBuilder();
-        IChatBaseComponent component = new IChatBaseComponent();
-        for (int i = 0; i < text.length(); i++) {
-            char c = text.charAt(i);
-            if (c == EnumChatFormat.COLOR_CHAR) {
-                i++;
-                if (i >= text.length()) {
-                    break;
-                }
-                c = text.charAt(i);
-                if ((c >= 'A') && (c <= 'Z')) {
-                    c = (char)(c + ' ');
-                }
-                EnumChatFormat format = EnumChatFormat.getByChar(c);
-                if (format != null) {
-                    if (builder.length() > 0) {
-                        component.setText(builder.toString());
-                        components.add(component);
-                        component = new IChatBaseComponent(component);
-                        component.text = null;
-                        builder = new StringBuilder();
-                    }
-                    switch (format) {
-                    case BOLD: 
-                        component.modifier.setBold(true);
-                        break;
-                    case ITALIC: 
-                        component.modifier.setItalic(true);
-                        break;
-                    case UNDERLINE: 
-                        component.modifier.setUnderlined(true);
-                        break;
-                    case STRIKETHROUGH: 
-                        component.modifier.setStrikethrough(true);
-                        break;
-                    case OBFUSCATED: 
-                        component.modifier.setObfuscated(true);
-                        break;
-                    case RESET: 
-                        component = new IChatBaseComponent();
-                        component.modifier.setColor(new TextColor(EnumChatFormat.WHITE));
-                        break;
-                    default:
-                        component = new IChatBaseComponent();
-                        component.modifier.setColor(new TextColor(format));
-                        break;
-                    }
-                }
-            } else if (c == '#' && text.length() > i+6) {
-                String hex = text.substring(i+1, i+7);
-                if (RGBUtils.getInstance().isHexCode(hex)) {
-                    TextColor color;
-                    if (containsLegacyCode(text, i)) {
-                        color = new TextColor(hex, EnumChatFormat.getByChar(text.charAt(i+8)));
-                        i += 8;
-                    } else {
-                        color = new TextColor(hex);
-                        i += 6;
-                    }
-                    if (builder.length() > 0) {
-                        component.setText(builder.toString());
-                        components.add(component);
-                        builder = new StringBuilder();
-                    }
-                    component = new IChatBaseComponent();
-                    component.modifier.setColor(color);
-                } else {
-                    builder.append(c);
-                }
-            } else {
-                builder.append(c);
-            }
-        }
-        component.setText(builder.toString());
-        components.add(component);
-        return new IChatBaseComponent("").setExtra(components);
-    }
-
-    /**
-     * Returns true if text contains legacy color request at defined RGB index start
-     *
-     * @param   text
-     *          text to check
-     * @param   i
-     *          current index start
-     * @return  true if legacy color is defined, false if not
-     */
-    private static boolean containsLegacyCode(String text, int i) {
-        if (text.length() - i < 9 || text.charAt(i+7) != '|') return false;
-        return EnumChatFormat.getByChar(text.charAt(i+8)) != null;
-    }
-
-    /**
-     * Converts this component into a simple text with legacy colors (the closest match if color is set to RGB)
-     *
-     * @return  The simple text format
-     */
-    public String toLegacyText() {
-        StringBuilder builder = new StringBuilder();
-        append(builder, "");
-        return builder.toString();
-    }
-
-    /**
-     * Appends text to string builder, might also add color and magic codes if they are different
-     * from previous component in chain.
-     *
-     * @param   builder
-     *          builder to append text to
-     * @param   previousFormatting
-     *          colors and magic codes in previous component
-     * @return  new formatting, might be identical to previous one
-     */
-    private String append(StringBuilder builder, String previousFormatting) {
-        String formatting = previousFormatting;
-        if (text != null) {
-            formatting = getFormatting();
-            if (!formatting.equals(previousFormatting)) {
-                builder.append(formatting);
-            }
-            builder.append(text);
-
-        }
-        for (IChatBaseComponent component : getExtra()) {
-            formatting = component.append(builder, formatting);
-        }
-        return formatting;
-    }
-
-    /**
-     * Returns colors and magic codes of this component
-     *
-     * @return  used colors and magic codes
-     */
-    private String getFormatting() {
-        StringBuilder builder = new StringBuilder();
-        if (modifier.getColor() != null) {
-            if (modifier.getColor().getLegacyColor() == EnumChatFormat.WHITE) {
-                //preventing unwanted &r -> &f conversion and stopping the <1.13 client bug fix from working
-                builder.append(EnumChatFormat.RESET.getFormat());
-            } else {
-                builder.append(modifier.getColor().getLegacyColor().getFormat());
-            }
-        }
-        builder.append(modifier.getMagicCodes());
-        return builder.toString();
-    }
-
-    /**
-     * Returns raw text without colors, only works correctly when component is organized
-     *
-     * @return  raw text in this component and all child components
-     */
-    public String toRawText() {
-        StringBuilder builder = new StringBuilder();
-        if (text != null) builder.append(text);
-        for (IChatBaseComponent child : getExtra()) {
-            if (child.text != null) builder.append(child.text);
-        }
-        return builder.toString();
-    }
-
-    /**
-     * Converts the component into flat text with used colors (including rgb) and magic codes
-     *
-     * @return  converted text
-     */
-    public String toFlatText() {
-        StringBuilder builder = new StringBuilder();
-        if (modifier.getColor() != null) builder.append("#").append(modifier.getColor().getHexCode());
-        builder.append(modifier.getMagicCodes());
-        if (text != null) builder.append(text);
-        for (IChatBaseComponent child : getExtra()) {
-            builder.append(child.toFlatText());
-        }
-        return builder.toString();
-    }
-
-    /**
-     * Returns the most optimized component based on text. Returns null if text is null,
-     * organized component if RGB colors are used or simple component with only text field
-     * containing the whole text when no RGB colors are used
-     *
-     * @param   text
-     *          text to create component from
-     * @return  The most performance-optimized component based on text
-     */
-    public static IChatBaseComponent optimizedComponent(String text) {
-        return stringCache.get(text, null);
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/WrappedChatComponent.java

@@ -1,62 +0,0 @@
-package me.neznamy.tab.api.chat;
-
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import lombok.NonNull;
-import me.neznamy.tab.api.ProtocolVersion;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.List;
-
-/**
- * A class extending IChatBaseComponent that holds the original value
- * to avoid deserializing it, which is an unnecessary operation that
- * slows down the performance, as well as makes code more complicated
- * and open to problems.
- */
-@AllArgsConstructor
-public class WrappedChatComponent extends IChatBaseComponent {
-
-    /** Original NMS component */
-    @Getter private final Object originalComponent;
-
-    @Override
-    public String toString() {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public String toString(ProtocolVersion clientVersion) {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public List<IChatBaseComponent> getExtra() {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public String getText() {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public @NotNull ChatModifier getModifier() {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public IChatBaseComponent setExtra(List<IChatBaseComponent> components) {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public void addExtra(@NonNull IChatBaseComponent child) {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-
-    @Override
-    public void setModifier(@NotNull ChatModifier modifier) {
-        throw new UnsupportedOperationException("Not supported for " + getClass().getSimpleName());
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/MiniMessageFormat.java

@@ -1,20 +0,0 @@
-package me.neznamy.tab.api.chat.rgb.format;
-
-import net.kyori.adventure.text.minimessage.MiniMessage;
-import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
-
-/**
- * Call to MiniMessage API to reformat text to &x&R&R&G&G&B&B
- */
-public class MiniMessageFormat implements RGBFormatter {
-
-    @Override
-    public String reformat(String text) {
-        if (!text.contains("<")) return text;
-        try {
-            return LegacyComponentSerializer.legacySection().serialize(MiniMessage.miniMessage().deserialize(text));
-        } catch (Throwable ignored) {
-            return text;
-        }
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/rgb/format/UnnamedFormat1.java

@@ -1,12 +0,0 @@
-package me.neznamy.tab.api.chat.rgb.format;
-
-/**
- * Formatter for &#RRGGBB
- */
-public class UnnamedFormat1 implements RGBFormatter {
-
-    @Override
-    public String reformat(String text) {
-        return text.contains("&#") ? text.replace("&#", "#") : text;
-    }
-}

api/src/main/java/me/neznamy/tab/api/chat/rgb/gradient/KyoriGradient.java

@@ -1,46 +0,0 @@
-package me.neznamy.tab.api.chat.rgb.gradient;
-
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-import me.neznamy.tab.api.chat.EnumChatFormat;
-import me.neznamy.tab.api.chat.TextColor;
-
-/**
- * Gradient applier for <gradient:#RRGGBB:#RRGGBB>Text</gradient>
- * and <gradient:#RRGGBB|L:#RRGGBB>Text</gradient>
- */
-public class KyoriGradient implements GradientPattern {
-
-    private final Pattern pattern = Pattern.compile("<gradient:#[0-9a-fA-F]{6}:#[0-9a-fA-F]{6}>[^<]*</gradient>");
-
-    private final Pattern patternLegacy = Pattern.compile("<gradient:#[0-9a-fA-F]{6}\\|.:#[0-9a-fA-F]{6}>[^<]*</gradient>");
-    
-    @Override
-    public String applyPattern(String text, boolean ignorePlaceholders) {
-        if (!text.contains("<grad")) return text;
-        String replaced = text;
-        Matcher m = patternLegacy.matcher(replaced);
-        while (m.find()) {
-            String format = m.group();
-            EnumChatFormat legacyColor = EnumChatFormat.getByChar(format.charAt(18));
-            if ((ignorePlaceholders && format.contains("%")) || legacyColor == null) continue;
-            TextColor start = new TextColor(format.substring(11, 17), legacyColor);
-            String message = format.substring(28, format.length()-11);
-            TextColor end = new TextColor(format.substring(21, 27));
-            String applied = asGradient(start, message, end);
-            replaced = replaced.replace(format, applied);
-        }
-        m = pattern.matcher(replaced);
-        while (m.find()) {
-            String format = m.group();
-            if (ignorePlaceholders && format.contains("%")) continue;
-            TextColor start = new TextColor(format.substring(11, 17));
-            String message = format.substring(26, format.length()-11);
-            TextColor end = new TextColor(format.substring(19, 25));
-            String applied = asGradient(start, message, end);
-            replaced = replaced.replace(format, applied);
-        }
-        return replaced;
-    }
-}

api/src/main/java/me/neznamy/tab/api/event/EventBus.java

@@ -1,16 +1,19 @@
 package me.neznamy.tab.api.event;
 
+import lombok.NonNull;
+
 /**
  * The event bus. This is used to register event listeners/handlers for
  * handling events that may be fired by TAB.
  */
+@SuppressWarnings("unused") // API class
 public interface EventBus {
 
     /**
      * Scans the given listener for any method that is annotated with
      * {@link Subscribe} and registers it as a listener to this event bus.
      *
-     * All methods in this class that are annotated with {@link Subscribe}
+     * <p>All methods in this class that are annotated with {@link Subscribe}
      * must meet the following criteria:
      * <ul>
      *     <li>It must be <strong>public</strong>.</li>
@@ -24,7 +27,7 @@ public interface EventBus {
      * @param listener the listener to register
      * @throws RuntimeException if a method does not meet the criteria
      */
-    void register(Object listener);
+    void register(@NonNull Object listener);
 
     /**
      * Registers the given handler to this event bus.
@@ -33,7 +36,7 @@ public interface EventBus {
      * @param handler the handler to register
      * @param <E> the type of the event
      */
-    <E extends TabEvent> void register(Class<E> type, EventHandler<E> handler);
+    <E extends TabEvent> void register(@NonNull Class<E> type, @NonNull EventHandler<E> handler);
 
     /**
      * Scans the given listener for any method that is annotated with
@@ -41,7 +44,7 @@ public interface EventBus {
      *
      * @param listener the listener to unregister
      */
-    void unregister(Object listener);
+    void unregister(@NonNull Object listener);
 
     /**
      * Unregisters the given handler from this event bus.
@@ -49,5 +52,5 @@ public interface EventBus {
      * @param handler the handler to unregister
      * @param <E> the type of the event
      */
-    <E extends TabEvent> void unregister(EventHandler<E> handler);
+    <E extends TabEvent> void unregister(@NonNull EventHandler<E> handler);
 }

api/src/main/java/me/neznamy/tab/api/event/TabEvent.java

@@ -3,7 +3,7 @@ package me.neznamy.tab.api.event;
 /**
  * An event that may be fired by TAB when something occurs.
  *
- * This is a marker interface. All events <strong>must</strong> implement this
+ * <p>This is a marker interface. All events <strong>must</strong> implement this
  * interface.
  */
 public interface TabEvent {

api/src/main/java/me/neznamy/tab/api/event/player/PlayerLoadEvent.java

@@ -2,6 +2,7 @@ package me.neznamy.tab.api.event.player;
 
 import me.neznamy.tab.api.TabPlayer;
 import me.neznamy.tab.api.event.TabEvent;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Called when the player has been fully loaded by TAB.
@@ -13,13 +14,13 @@ public interface PlayerLoadEvent extends TabEvent {
      *
      * @return  the player that was loaded
      */
-    TabPlayer getPlayer();
+    @NotNull TabPlayer getPlayer();
 
     /**
-     * Returns true if player was loaded because they joined,
-     * false if the player was loaded because tab reload command was executed
+     * Returns {@code true} if player was loaded because they joined,
+     * {@code false} if the player was loaded because tab reload command was executed
      *
-     * @return  true if player joined, false if plugin was reloaded
+     * @return  {@code true} if player joined, {@code false} if plugin was reloaded
      */
     boolean isJoin();
 }

api/src/main/java/me/neznamy/tab/api/event/plugin/PlaceholderRegisterEvent.java

@@ -1,11 +1,48 @@
 package me.neznamy.tab.api.event.plugin;
 
+import lombok.NonNull;
+import me.neznamy.tab.api.TabPlayer;
 import me.neznamy.tab.api.event.TabEvent;
-import me.neznamy.tab.api.placeholder.Placeholder;
+import org.jetbrains.annotations.NotNull;
 
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+/**
+ * Called when an unknown placeholder is about to be registered.
+ * It defaults to a PlaceholderAPI implementation, but can be overridden.
+ */
 public interface PlaceholderRegisterEvent extends TabEvent {
 
-    String getIdentifier();
+    /**
+     * Returns placeholder identifier starting and ending with {@code %}
+     *
+     * @return  placeholder identifier starting and ending with {@code %}
+     */
+    @NotNull String getIdentifier();
 
-    void setPlaceholder(Placeholder placeholder);
+    /**
+     * Sets placeholder to specified server placeholder implementation.
+     *
+     * @param   supplier
+     *          Placeholder replacer
+     */
+    void setServerPlaceholder(@NonNull Supplier<Object> supplier);
+
+    /**
+     * Sets placeholder to specified player placeholder implementation.
+     *
+     * @param   function
+     *          Placeholder replacer
+     */
+    void setPlayerPlaceholder(@NonNull Function<TabPlayer, Object> function);
+
+    /**
+     * Sets placeholder to specified relational placeholder implementation.
+     *
+     * @param   function
+     *          Placeholder replacer
+     */
+    void setRelationalPlaceholder(@NonNull BiFunction<TabPlayer, TabPlayer, Object> function);
 }

api/src/main/java/me/neznamy/tab/api/nametag/NameTagManager.java

@@ -0,0 +1,222 @@
+package me.neznamy.tab.api.nametag;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for manipulating player name tags.
+ * <p>
+ * Instance can be obtained using {@link TabAPI#getNameTagManager()}.
+ * This requires the Team feature to be enabled in config, otherwise the method will
+ * return {@code null}.
+ */
+@SuppressWarnings("unused") // API class
+public interface NameTagManager {
+
+    /**
+     * Makes player's NameTag globally invisible
+     *
+     * @param   player
+     *          player to hide name tag of
+     * @see     #showNameTag(TabPlayer)
+     * @see     #hasHiddenNameTag(TabPlayer)
+     */
+    void hideNameTag(@NonNull TabPlayer player);
+
+    /**
+     * Hides player's NameTag for specified player until it's shown again
+     *
+     * @param   player
+     *          player to hide name tag of
+     * @param   viewer
+     *          player to hide name tag for
+     */
+    void hideNameTag(@NonNull TabPlayer player, @NonNull TabPlayer viewer);
+
+    /**
+     * Makes player's NameTag visible again
+     *
+     * @param   player
+     *          player to show name tag of
+     * @see     #hideNameTag(TabPlayer)
+     * @see     #hasHiddenNameTag(TabPlayer)
+     */
+    void showNameTag(@NonNull TabPlayer player);
+
+    /**
+     * Shows player's NameTag for specified viewer if it was hidden before
+     *
+     * @param   player
+     *          player to show name tag of
+     * @param   viewer
+     *          player to show NameTag back for
+     */
+    void showNameTag(@NonNull TabPlayer player, @NonNull TabPlayer viewer);
+
+    /**
+     * Return whether player has hidden NameTag or not
+     *
+     * @param   player
+     *          player to check name tag visibility status of
+     * @return  Whether player has hidden NameTag or not
+     * @see     #hideNameTag(TabPlayer)
+     * @see     #showNameTag(TabPlayer)
+     */
+    boolean hasHiddenNameTag(@NonNull TabPlayer player);
+
+    /**
+     * Returns true if NameTag is hidden for specified viewer, false if not
+     *
+     * @param   player
+     *          player to check visibility status of
+     * @param   viewer
+     *          player to check visibility status for
+     * @return  true if hidden, false if not
+     */
+    boolean hasHiddenNameTag(@NonNull TabPlayer player, @NonNull TabPlayer viewer);
+
+    /**
+     * Unregisters player's team and no longer handles it, as well as disables anti-override for teams.
+     * This can be resumed using resumeTeamHandling(). If team handling was paused already, nothing happens.
+     *
+     * @param   player
+     *          player to pause team handling of
+     */
+    void pauseTeamHandling(@NonNull TabPlayer player);
+
+    /**
+     * Resumes team handling if it was before paused using pauseTeamHandling(), if not, nothing happens
+     *
+     * @param   player
+     *          player to resume team handling of
+     */
+    void resumeTeamHandling(@NonNull TabPlayer player);
+
+    /**
+     * Returns true if team handling is paused for this player using pauseTeamHandling(), false if not, or
+     * it was resumed already using resumeTeamHandling
+     *
+     * @param   player
+     *          player to check handling status of
+     * @return  true if paused, false if not
+     */
+    boolean hasTeamHandlingPaused(@NonNull TabPlayer player);
+
+    /**
+     * Forces collision rule for the player. Setting it to null will remove forced value
+     *
+     * @param   player
+     *          player to set collision rule of
+     * @param   collision
+     *          forced collision rule
+     */
+    void setCollisionRule(@NonNull TabPlayer player, @Nullable Boolean collision);
+
+    /**
+     * Returns forced collision rule or null if collision is not forced using setCollisionRule
+     *
+     * @param   player
+     *          player to get forced collision of
+     * @return  forced value or null if not forced
+     */
+    @Nullable Boolean getCollisionRule(@NonNull TabPlayer player);
+
+    /**
+     * Changes player's prefix to provided value. Supports placeholders,
+     * as well as any supported RGB formats. Use {@code null} to reset
+     * value back to original.
+     *
+     * @param   player
+     *          player to change prefix of
+     * @param   prefix
+     *          new prefix value
+     * @see     #getCustomPrefix(TabPlayer)
+     * @see     #getOriginalPrefix(TabPlayer)
+     */
+    void setPrefix(@NonNull TabPlayer player, @Nullable String prefix);
+
+    /**
+     * Changes player's suffix to provided value. Supports placeholders,
+     * as well as any supported RGB formats. Use {@code null} to reset
+     * value back to original.
+     *
+     * @param   player
+     *          player to change prefix of
+     * @param   suffix
+     *          new suffix value
+     * @see     #getCustomSuffix(TabPlayer)
+     * @see     #getOriginalSuffix(TabPlayer)
+     */
+    void setSuffix(@NonNull TabPlayer player, @Nullable String suffix);
+
+    /**
+     * Returns custom prefix assigned using {@link #setPrefix(TabPlayer, String)}.
+     * If no custom prefix is set, returns {@code null}.
+     *
+     * @param   player
+     *          Player to get custom prefix of
+     * @return  Custom prefix assigned using the API.
+     * @see     #setPrefix(TabPlayer, String)
+     * @see     #getOriginalPrefix(TabPlayer)
+     */
+    @Nullable
+    String getCustomPrefix(@NonNull TabPlayer player);
+
+    /**
+     * Returns custom suffix assigned using {@link #setSuffix(TabPlayer, String)}.
+     * If no custom suffix is set, returns {@code null}.
+     *
+     * @param   player
+     *          Player to get custom suffix of
+     * @return  Custom suffix assigned using the API.
+     * @see     #setSuffix(TabPlayer, String)
+     * @see     #getOriginalSuffix(TabPlayer)
+     */
+    @Nullable
+    String getCustomSuffix(@NonNull TabPlayer player);
+
+    /**
+     * Returns original prefix assigned by the plugin using internal logic.
+     * @param   player
+     *          Player to get original prefix of
+     * @return  Original prefix assigned by the plugin's internal logic.
+     * @see     #getCustomPrefix(TabPlayer)
+     */
+    @NonNull
+    String getOriginalPrefix(@NonNull TabPlayer player);
+
+    /**
+     * Returns original suffix assigned by the plugin using internal logic.
+     * @param   player
+     *          Player to get original suffix of
+     * @return  Original suffix assigned by the plugin's internal logic.
+     * @see     #getCustomSuffix(TabPlayer)
+     */
+    @NonNull
+    String getOriginalSuffix(@NonNull TabPlayer player);
+
+    /**
+     * Toggles name tag visibility view on all players for specified player.
+     * On first call, name tags of all players will become invisible for specified
+     * player. On second call, they will become visible again.
+     *
+     * @param   player
+     *          player to toggle name tag visibility view for
+     * @param   sendToggleMessage
+     *          {@code true} if configured toggle message should be sent, {@code false} if not
+     */
+    void toggleNameTagVisibilityView(@NonNull TabPlayer player, boolean sendToggleMessage);
+
+    /**
+     * Returns {@code true} if player has hidden name tags by either calling
+     * {@link #toggleNameTagVisibilityView(TabPlayer, boolean)} or using a command,
+     * {@code false} if not.
+     *
+     * @param   player
+     *          player to check
+     * @return  {@code true} if hidden, {@code false} if not
+     */
+    boolean hasHiddenNameTagVisibilityView(@NonNull TabPlayer player);
+}

api/src/main/java/me/neznamy/tab/api/nametag/UnlimitedNameTagManager.java

@@ -0,0 +1,129 @@
+package me.neznamy.tab.api.nametag;
+
+import java.util.List;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for manipulating player name tags.
+ * <p>
+ * Instance can be obtained using {@link TabAPI#getNameTagManager()} and then casting it.
+ * This requires both Team and Unlimited name tag features to be enabled in config, otherwise the method will
+ * return {@code null} or not be an instance of this class.
+ */
+@SuppressWarnings("unused") // API class
+public interface UnlimitedNameTagManager extends NameTagManager {
+
+    /**
+     * Disables armor stands of specified player and displays vanilla name tags instead.
+     *
+     * @param   player
+     *          Player to disable armor stands of
+     * @see     #enableArmorStands(TabPlayer)
+     * @see     #hasDisabledArmorStands(TabPlayer)
+     */
+    void disableArmorStands(@NonNull TabPlayer player);
+
+    /**
+     * Enabled back armor stands of player, who was disabled previously using
+     * {@link #disableArmorStands(TabPlayer)}.
+     *
+     * @param   player
+     *          Player to enable back
+     * @see     #disableArmorStands(TabPlayer)
+     * @see     #hasDisabledArmorStands(TabPlayer)
+     */
+    void enableArmorStands(@NonNull TabPlayer player);
+
+    /**
+     * Returns {@code true} if player has armor stands disabled using
+     * {@link #disableArmorStands(TabPlayer)}, {@code false} otherwise.
+     *
+     * @param   player
+     *          Player to check
+     * @return  {@code true} if disabled, {@code false} if not.
+     * @see     #disableArmorStands(TabPlayer)
+     * @see     #enableArmorStands(TabPlayer)
+     */
+    boolean hasDisabledArmorStands(@NonNull TabPlayer player);
+
+    /**
+     * Changes name to specified value. Set to {@code null} to
+     * reset back to original value.
+     *
+     * @param   player
+     *          Player to change name of
+     * @param   customName
+     *          New name, or {@code null} to reset to original value
+     */
+    void setName(@NonNull TabPlayer player, @Nullable String customName);
+
+    /**
+     * Changes line to specified value. Set to {@code null} to reset back to original value.
+     *
+     * @param   player
+     *          Player to change line of
+     * @param   line
+     *          Name of defined line
+     * @param   value
+     *          Value to use, or {@code null} to reset back to original value
+     * @see     #getDefinedLines()
+     */
+    void setLine(@NonNull TabPlayer player, @NonNull String line, @Nullable String value);
+
+    /**
+     * Returns custom name value set using {@link #setName(TabPlayer, String)}.
+     *
+     * @param   player
+     *          Player to check
+     * @return  Custom name set previously or {@code null} if not set
+     * @see     #setName(TabPlayer, String)
+     */
+    @Nullable String getCustomName(@NonNull TabPlayer player);
+
+    /**
+     * Returns custom line value set using {@link #setLine(TabPlayer, String, String)}.
+     *
+     * @param   player
+     *          Player to check
+     * @param   line
+     *          Defined line
+     * @return  Custom name set previously or {@code null} if not set
+     * @see     #setName(TabPlayer, String)
+     * @see     #getDefinedLines()
+     */
+    @Nullable String getCustomLineValue(@NonNull TabPlayer player, @NonNull String line);
+
+    /**
+     * Returns original name value configured in files.
+     *
+     * @param   player
+     *          Player to check
+     * @return  Original configured name
+     * @see     #setName(TabPlayer, String)
+     */
+    @NotNull String getOriginalName(@NonNull TabPlayer player);
+
+    /**
+     * Returns original line value configured in files.
+     *
+     * @param   player
+     *          Player to check
+     * @param   line
+     *          Line name
+     * @return  Original configured line
+     * @see     #setLine(TabPlayer, String, String)
+     */
+    @NotNull String getOriginalLineValue(@NonNull TabPlayer player, @NonNull String line);
+
+    /**
+     * Returns list of all defined lines in config, both static and dynamic lines.
+     *
+     * @return  List of all defined lines in config
+     */
+    @NotNull List<String> getDefinedLines();
+}

api/src/main/java/me/neznamy/tab/api/placeholder/Placeholder.java

@@ -1,14 +1,23 @@
 package me.neznamy.tab.api.placeholder;
 
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * An interface representing some kind of placeholder
+ */
 public interface Placeholder {
 
+    /**
+     * Returns refresh interval of this placeholder
+     *
+     * @return  refresh interval of this placeholder
+     */
     int getRefresh();
 
-    String getIdentifier();
-
-    void enableTriggerMode(Runnable onActivation, Runnable onDisable);
-
-    void unload();
-
-    boolean isUsed();
+    /**
+     * Returns placeholder's identifier
+     *
+     * @return  placeholder's identifier
+     */
+    @NotNull String getIdentifier();
 }

api/src/main/java/me/neznamy/tab/api/placeholder/PlaceholderManager.java

@@ -1,53 +1,93 @@
 package me.neznamy.tab.api.placeholder;
 
-import java.util.List;
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+
 import java.util.function.BiFunction;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabPlayer;
-
+/**
+ * An interface allowing placeholder registration. Instance can be
+ * obtained using {@link TabAPI#getPlaceholderManager()}
+ */
+@SuppressWarnings("unused") // API class
 public interface PlaceholderManager {
 
     /**
      * Registers a server placeholder (placeholder with same output for all players)
-     */
-    ServerPlaceholder registerServerPlaceholder(String identifier, int refresh, Supplier<Object> supplier);
-
-    /**
-     * Registers a player placeholder (placeholder with player-specific output)
-     */
-    PlayerPlaceholder registerPlayerPlaceholder(String identifier, int refresh, Function<TabPlayer, Object> function);
-
-    /**
-     * Registers a relational placeholder (different output for each player pair)
-     */
-    RelationalPlaceholder registerRelationalPlaceholder(String identifier, int refresh, BiFunction<TabPlayer, TabPlayer, Object> function);
-
-    /**
-     * Detects placeholders in text using %% pattern and returns list of all detected identifiers
-     *
-     * @param   text
-     *          text to detect placeholders in
-     * @return  list of detected identifiers
-     */
-    List<String> detectPlaceholders(String text);
-
-    /**
-     * Adds placeholder to list of used placeholders and assigns this feature as using it,
-     * which will then receive refresh() if values changes
      *
      * @param   identifier
-     *          placeholder identifier
-     * @param   feature
-     *          feature using the placeholder
+     *          Placeholder identifier
+     * @param   refresh
+     *          Refresh interval
+     * @param   supplier
+     *          Supplier for placeholder output
+     * @return  Registered placeholder for further use
+     * @throws  IllegalArgumentException
+     *          If {@code identifier} does not start and end with {@code %} or
+     *          {@code refresh} is not divisible by 50
      */
-    void addUsedPlaceholder(String identifier, TabFeature feature);
+    @NotNull ServerPlaceholder registerServerPlaceholder(@NonNull String identifier, int refresh, @NonNull Supplier<Object> supplier);
 
-    String findReplacement(String placeholder, String output);
+    /**
+     * Registers a player placeholder (placeholder different output per player)
+     *
+     * @param   identifier
+     *          Placeholder identifier
+     * @param   refresh
+     *          Refresh interval
+     * @param   function
+     *          Function for placeholder output
+     * @return  Registered placeholder for further use
+     * @throws  IllegalArgumentException
+     *          If {@code identifier} does not start and end with {@code %} or
+     *          {@code refresh} is not divisible by 50
+     */
+    @NotNull PlayerPlaceholder registerPlayerPlaceholder(@NonNull String identifier, int refresh, @NonNull Function<TabPlayer, Object> function);
 
-    List<String> getUsedPlaceholders();
+    /**
+     * Registers a relational placeholder (placeholder with output different for each player duo)
+     *
+     * @param   identifier
+     *          Placeholder identifier
+     * @param   refresh
+     *          Refresh interval
+     * @param   function
+     *          Function for placeholder output
+     * @return  Registered placeholder for further use
+     * @throws  IllegalArgumentException
+     *          If {@code identifier} does not start and end with {@code %},
+     *          does not start with {@code %rel_} or
+     *          {@code refresh} is not divisible by 50
+     */
+    @NotNull RelationalPlaceholder registerRelationalPlaceholder(@NonNull String identifier, int refresh, @NonNull BiFunction<TabPlayer, TabPlayer, Object> function);
 
-    Placeholder getPlaceholder(String identifier);
+    /**
+     * Returns placeholder from specified identifier. If it does not exist, it is registered
+     * as a PlaceholderAPI placeholder and returned.
+     *
+     * @param   identifier
+     *          Placeholder identifier
+     * @return  Placeholder with specified identifier
+     */
+    @NotNull Placeholder getPlaceholder(@NonNull String identifier);
+
+    /**
+     * Unregisters placeholder and makes plugin no longer refresh it.
+     *
+     * @param   placeholder
+     *          Placeholder to unregister
+     */
+    void unregisterPlaceholder(@NonNull Placeholder placeholder);
+
+    /**
+     * Unregisters placeholder and makes plugin no longer refresh it.
+     *
+     * @param   identifier
+     *          identifier of placeholder to unregister
+     */
+    void unregisterPlaceholder(@NonNull String identifier);
 }

api/src/main/java/me/neznamy/tab/api/placeholder/PlayerPlaceholder.java

@@ -1,28 +1,31 @@
 package me.neznamy.tab.api.placeholder;
 
+import lombok.NonNull;
 import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.Nullable;
 
+/**
+ * Interface for player placeholders (placeholders returning different value for each player)
+ */
 public interface PlayerPlaceholder extends Placeholder {
 
-    void updateValue(TabPlayer player, Object value);
-
     /**
-     * Calls the placeholder request function and returns the output.
-     * If the placeholder threw an exception, it is logged in {@code placeholder-errors.log}
-     * file and "ERROR" is returned.
-     *
-     * @param   p
-     *          player to get placeholder value for
-     * @return  value placeholder returned or "ERROR" if it threw an error
-     */
-    Object request(TabPlayer p);
-
-    /**
-     * Returns last known value for given player.
+     * Force-updates placeholder value. It will still be overridden by periodic refresh later,
+     * so this is (only) useful for force an update when value is supposed to change, and you have
+     * a high refresh interval set.
      *
      * @param   player
-     *          player to get last value for
-     * @return  last known value for entered player
+     *          Player to update value for
+     * @param   value
+     *          New value
      */
-    String getLastValue(TabPlayer player);
+    void updateValue(@NonNull TabPlayer player, @Nullable Object value);
+
+    /**
+     * Force-updates placeholder value using previously provided update function.
+     *
+     * @param   player
+     *          Player to update value for
+     */
+    void update(@NonNull TabPlayer player);
 }

api/src/main/java/me/neznamy/tab/api/placeholder/RelationalPlaceholder.java

@@ -1,33 +1,36 @@
 package me.neznamy.tab.api.placeholder;
 
+import lombok.NonNull;
 import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.Nullable;
 
+/**
+ * An interface for relational placeholders (returning different value for each player duo)
+ */
+@SuppressWarnings("unused") // API class
 public interface RelationalPlaceholder extends Placeholder {
 
-    void updateValue(TabPlayer viewer, TabPlayer target, Object value);
-
     /**
-     * Calls the placeholder request function and returns the output.
-     * If the placeholder threw an exception, it is logged in {@code placeholder-errors.log}
-     * file and "ERROR" is returned.
+     * Force-updates placeholder value. It will still be overridden by periodic refresh later,
+     * so this is (only) useful for force an update when value is supposed to change, and you have
+     * a high refresh interval set.
      *
      * @param   viewer
-     *          player looking at output of the placeholder
+     *          Placeholder viewer
      * @param   target
-     *          player the placeholder is displayed on
-     * @return  value placeholder returned or "ERROR" if it threw an error
+     *          Placeholder target
+     * @param   value
+     *          New value
      */
-    Object request(TabPlayer viewer, TabPlayer target);
+    void updateValue(@NonNull TabPlayer viewer, @NonNull TabPlayer target, @Nullable Object value);
 
     /**
-     * Returns last known value for given players. First player is viewer,
-     * second player is target.
+     * Force-updates placeholder value using previously provided update function.
      *
      * @param   viewer
-     *          viewer of the placeholder
+     *          Placeholder viewer
      * @param   target
-     *          target who is the text displayed on
-     * @return  last known value for entered player duo
+     *          Placeholder target
      */
-    String getLastValue(TabPlayer viewer, TabPlayer target);
+    void update(@NonNull TabPlayer viewer, @NonNull TabPlayer target);
 }

api/src/main/java/me/neznamy/tab/api/placeholder/ServerPlaceholder.java

@@ -1,22 +1,24 @@
 package me.neznamy.tab.api.placeholder;
 
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * An interface for server placeholders (returning same value for all players)
+ */
 public interface ServerPlaceholder extends Placeholder {
 
-    void updateValue(Object value);
+    /**
+     * Force-updates placeholder value. It will still be overridden by periodic refresh later,
+     * so this is (only) useful for force an update when value is supposed to change, and you have
+     * a high refresh interval set.
+     *
+     * @param   value
+     *          New value
+     */
+    void updateValue(@Nullable Object value);
 
     /**
-     * Calls the placeholder request function and returns the output.
-     * If the placeholder threw an exception, it is logged in {@code placeholder-errors.log}
-     * file and "ERROR" is returned.
-     *
-     * @return  value placeholder returned or "ERROR" if it threw an error
+     * Force-updates placeholder value using previously provided update function.
      */
-    Object request();
-
-    /**
-     * Returns last known value of the placeholder.
-     *
-     * @return  last known value
-     */
-    String getLastValue();
+    void update();
 }

api/src/main/java/me/neznamy/tab/api/protocol/PacketBuilder.java

@@ -1,255 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.NonNull;
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.chat.EnumChatFormat;
-import me.neznamy.tab.api.chat.IChatBaseComponent;
-import me.neznamy.tab.api.chat.rgb.RGBUtils;
-import me.neznamy.tab.api.util.BiFunctionWithException;
-
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * A class for packet building, methods are overridden in
- * platform-specific builders which extend this class to build actual packets.
- * Packets which don't have a method override are forwarded into
- * sendPacket method, where they are handled using platform's API instead.
- */
-public class PacketBuilder {
-
-    /** Function map turning custom packet class into platform-specific packets */
-    protected final Map<Class<? extends TabPacket>, BiFunctionWithException<TabPacket, ProtocolVersion, Object>> buildMap = new HashMap<>();
-
-    /**
-     * Constructs new instance and fills {@link #buildMap} with abstract build methods
-     * of packets present on all platforms.
-     */
-    public PacketBuilder() {
-        buildMap.put(PacketPlayOutBoss.class, (packet, version) -> build((PacketPlayOutBoss)packet, version));
-        buildMap.put(PacketPlayOutChat.class, (packet, version) -> build((PacketPlayOutChat)packet, version));
-        buildMap.put(PacketPlayOutPlayerInfo.class, (packet, version) -> build((PacketPlayOutPlayerInfo)packet, version));
-        buildMap.put(PacketPlayOutPlayerListHeaderFooter.class, (packet, version) -> build((PacketPlayOutPlayerListHeaderFooter)packet, version));
-        buildMap.put(PacketPlayOutScoreboardDisplayObjective.class, (packet, version) -> build((PacketPlayOutScoreboardDisplayObjective)packet, version));
-        buildMap.put(PacketPlayOutScoreboardObjective.class, (packet, version) -> build((PacketPlayOutScoreboardObjective)packet, version));
-        buildMap.put(PacketPlayOutScoreboardScore.class, (packet, version) -> build((PacketPlayOutScoreboardScore)packet, version));
-        buildMap.put(PacketPlayOutScoreboardTeam.class, (packet, version) -> build((PacketPlayOutScoreboardTeam)packet, version));
-    }
-
-    /**
-     * Converts custom packet into platform-specific packet by calling a function from
-     * {@link #buildMap}.
-     *
-     * @param   packet
-     *          Packet to build
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     * @throws  ReflectiveOperationException
-     *          if reflection fails
-     */
-    public Object build(@NonNull TabPacket packet, @NonNull ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return buildMap.get(packet.getClass()).apply(packet, clientVersion);
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutBoss class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public Object build(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutChat class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutChat packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutPlayerInfo class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public Object build(PacketPlayOutPlayerInfo packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutPlayerListHeaderFooter class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutPlayerListHeaderFooter packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutScoreboardDisplayObjective class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutScoreboardDisplayObjective packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutScoreboardObjective class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutScoreboardObjective packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutScoreboardScore class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutScoreboardScore packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Constructs platform-specific PacketPlayOutScoreboardTeam class based on custom packet class
-     *
-     * @param   packet
-     *          Custom packet to be built
-     * @param   clientVersion
-     *          Protocol version of player to build the packet for
-     * @return  Platform-specific packet
-     */
-    public Object build(PacketPlayOutScoreboardTeam packet, ProtocolVersion clientVersion) {
-        return packet;
-    }
-
-    /**
-     * Cuts given string to specified character length (or length-1 if last character is a color character)
-     * and translates RGB to legacy colors. If string is not that long, the original string is returned.
-     * RGB codes are converted into legacy, since cutting is only needed for &lt;1.13.
-     * If {@code string} is {@code null}, empty string is returned.
-     *
-     * @param   string
-     *          String to cut
-     * @param   length
-     *          Length to cut to
-     * @return  string cut to {@code length} characters
-     */
-    public String cutTo(String string, int length) {
-        if (string == null) return "";
-        String legacyText = string;
-        if (string.contains("#")) {
-            //converting RGB to legacy colors
-            legacyText = RGBUtils.getInstance().convertRGBtoLegacy(string);
-        }
-        if (legacyText.length() <= length) return legacyText;
-        if (legacyText.charAt(length-1) == EnumChatFormat.COLOR_CHAR) {
-            return legacyText.substring(0, length-1); //cutting one extra character to prevent prefix ending with "&"
-        } else {
-            return legacyText.substring(0, length);
-        }
-    }
-
-    /**
-     * If {@code clientVersion} is &gt;= 1.13, creates a component from given text and returns
-     * it as a serialized component, which BungeeCord uses.
-     * <p>
-     * If {@code clientVersion} is &lt; 1.12, the text is cut to {@code length} characters if
-     * needed and returned.
-     *
-     * @param   text
-     *          Text to convert
-     * @param   clientVersion
-     *          Version of player to convert text for
-     * @return  serialized component for 1.13+ clients, cut string for 1.12-
-     */
-    public String jsonOrCut(String text, ProtocolVersion clientVersion, int length) {
-        if (text == null) return null;
-        if (clientVersion.getMinorVersion() >= 13) {
-            return IChatBaseComponent.optimizedComponent(text).toString(clientVersion);
-        } else {
-            return cutTo(text, length);
-        }
-    }
-
-    /**
-     * Converts platform-specific instance of player info packet into
-     * {@link PacketPlayOutPlayerInfo} object.
-     *
-     * @param   packet
-     *          platform-specific info packet
-     * @param   clientVersion
-     *          Version of client receiving the packet
-     * @return  The packet converted into {@link PacketPlayOutPlayerInfo}
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public PacketPlayOutPlayerInfo readPlayerInfo(Object packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return null;
-    }
-
-    /**
-     * Converts platform-specific instance of objective packet into
-     * {@link PacketPlayOutScoreboardObjective} object.
-     *
-     * @param   packet
-     *          platform-specific objective packet
-     * @return  The packet converted into {@link PacketPlayOutScoreboardObjective}
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public PacketPlayOutScoreboardObjective readObjective(Object packet) throws ReflectiveOperationException {
-        return null;
-    }
-
-    /**
-     * Converts platform-specific instance of display objective packet into
-     * {@link PacketPlayOutScoreboardDisplayObjective} object.
-     *
-     * @param   packet
-     *          platform-specific display objective packet
-     * @return  The packet converted into {@link PacketPlayOutScoreboardDisplayObjective}
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    public PacketPlayOutScoreboardDisplayObjective readDisplayObjective(Object packet) throws ReflectiveOperationException {
-        return null;
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutBoss.java

@@ -1,175 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.bossbar.BarColor;
-import me.neznamy.tab.api.bossbar.BarStyle;
-
-import java.util.UUID;
-
-/**
- * A class representing platform specific packet class
- */
-@Data
-public class PacketPlayOutBoss implements TabPacket {
-
-    /** UUID of the BossBar */
-    private final UUID id;
-
-    /** Action of this packet */
-    private Action action;
-
-    /** BossBar title */
-    private String name;
-
-    /** BossBar progress (0-1)*/
-    private float pct;
-
-    /** BossBar color */
-    private BarColor color;
-
-    /** BossBar style */
-    private BarStyle overlay;
-
-    /** Darken screen flag */
-    private boolean darkenScreen;
-
-    /** Play music flag */
-    private boolean playMusic;
-
-    /** Create fog flag */
-    private boolean createWorldFog;
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action}.ADD action
-     *
-     * @param   id
-     *          BossBar uuid
-     * @param   name
-     *          BossBar title
-     * @param   pct
-     *          BossBar progress
-     * @param   color
-     *          BossBar color
-     * @param   overlay
-     *          BossBar style
-     */
-    public PacketPlayOutBoss(@NonNull UUID id, @NonNull String name, float pct, @NonNull BarColor color, @NonNull BarStyle overlay) {
-        this.action = Action.ADD;
-        this.id = id;
-        this.name = name;
-        this.pct = pct;
-        this.color = color;
-        this.overlay = overlay;
-    }
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action#REMOVE} action
-     *
-     * @param   id
-     *          BossBar uuid
-     */
-    public PacketPlayOutBoss(@NonNull UUID id) {
-        this.action = Action.REMOVE;
-        this.id = id;
-    }
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action#UPDATE_PCT} action
-     *
-     * @param   id
-     *          BossBar uuid
-     * @param   pct
-     *          BossBar progress
-     */
-    public PacketPlayOutBoss(@NonNull UUID id, float pct) {
-        this.action = Action.UPDATE_PCT;
-        this.id = id;
-        this.pct = pct;
-    }
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action#UPDATE_NAME} action
-     *
-     * @param   id
-     *          BossBar uuid
-     * @param   name
-     *          BossBar title
-     */
-    public PacketPlayOutBoss(@NonNull UUID id, @NonNull String name) {
-        this.action = Action.UPDATE_NAME;
-        this.id = id;
-        this.name = name;
-    }
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action#UPDATE_STYLE} action
-     *
-     * @param   id
-     *          BossBar uuid
-     * @param   color
-     *          BossBar color
-     * @param   overlay
-     *          BossBar style
-     */
-    public PacketPlayOutBoss(@NonNull UUID id, @NonNull BarColor color, @NonNull BarStyle overlay) {
-        this.action = Action.UPDATE_STYLE;
-        this.id = id;
-        this.color = color;
-        this.overlay = overlay;
-    }
-
-    /**
-     * Constructs new instance with given parameters and
-     * {@link me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action#UPDATE_PROPERTIES} action
-     *
-     * @param   darkenScreen
-     *          Darken screen flag
-     * @param   playMusic
-     *          Play music flag
-     * @param   createWorldFog
-     *          Create fog flag
-     */
-    public PacketPlayOutBoss(@NonNull UUID id, boolean darkenScreen, boolean playMusic, boolean createWorldFog) {
-        this.action = Action.UPDATE_PROPERTIES;
-        this.id = id;
-        this.darkenScreen = darkenScreen;
-        this.playMusic = playMusic;
-        this.createWorldFog = createWorldFog;
-    }
-
-    /**
-     * Returns bitmask based on {@link #darkenScreen}, {@link #playMusic} and {@link #darkenScreen} values.
-     * <p>
-     * {@link #darkenScreen} adds {@code 1}, {@link #playMusic} {@code 2} and {@link #darkenScreen} {@code 4}
-     * to the final value.
-     *
-     * @return  the bitmask
-     */
-    public byte getFlags() {
-        byte value = 0;
-        if (darkenScreen) value += 1;
-        if (playMusic) value += 2;
-        if (createWorldFog) value += 4;
-        return value;
-    }
-
-    /**
-     * An enum representing all valid boss packet actions.
-     * Calling ordinal() will return action's network ID.
-     */
-    public enum Action {
-
-        ADD,
-        REMOVE,
-        UPDATE_PCT,
-        UPDATE_NAME,
-        UPDATE_STYLE,
-        UPDATE_PROPERTIES
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutChat.java

@@ -1,29 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.chat.IChatBaseComponent;
-
-/**
- * A class representing platform specific packet class
- */
-@Data
-public class PacketPlayOutChat implements TabPacket {
-
-    /** Message to be sent */
-    @NonNull private final IChatBaseComponent message;
-
-    /** Message position */
-    @NonNull private final ChatMessageType type;
-
-    /**
-     * An enum representing positions of a chat message
-     * Calling ordinal() will return type's network ID.
-     */
-    public enum ChatMessageType {
-
-        CHAT,
-        SYSTEM,
-        GAME_INFO
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutPlayerInfo.java

@@ -1,192 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.chat.IChatBaseComponent;
-
-import java.util.*;
-
-/**
- * A class representing platform specific packet class
- */
-@Data @AllArgsConstructor
-public class PacketPlayOutPlayerInfo implements TabPacket {
-
-    /** Map for faster EnumSet creation */
-    private static final EnumMap<EnumPlayerInfoAction, EnumSet<EnumPlayerInfoAction>> actionToEnumSetMap =
-            new EnumMap<EnumPlayerInfoAction, EnumSet<EnumPlayerInfoAction>>(EnumPlayerInfoAction.class) {{
-                for (EnumPlayerInfoAction action : EnumPlayerInfoAction.values()) {
-                    if (action == EnumPlayerInfoAction.ADD_PLAYER) {
-                        EnumSet<EnumPlayerInfoAction> set = EnumSet.allOf(EnumPlayerInfoAction.class);
-                        set.remove(EnumPlayerInfoAction.REMOVE_PLAYER);
-                        put(action, set);
-                    } else {
-                        put(action, EnumSet.of(action));
-                    }
-                }
-            }};
-
-    /** Packet actions */
-    private final EnumSet<EnumPlayerInfoAction> actions;
-
-    /** List of affected entries */
-    private final List<PlayerInfoData> entries;
-
-    /**
-     * Constructs new instance with given parameters.
-     * 
-     * @param   action
-     *          Packet action
-     * @param   entries
-     *          Affected entries
-     */
-    public PacketPlayOutPlayerInfo(EnumPlayerInfoAction action, PlayerInfoData... entries) {
-        this(action, Arrays.asList(entries));
-    }
-
-    /**
-     * Constructs new instance with given parameters.
-     * 
-     * @param   action
-     *          Packet action
-     * @param   entries
-     *          Affected entries
-     */
-    public PacketPlayOutPlayerInfo(@NonNull EnumPlayerInfoAction action, @NonNull List<PlayerInfoData> entries) {
-        this.actions = actionToEnumSetMap.get(action);
-        this.entries = entries;
-    }
-
-    /**
-     * Constructs new instance with given parameters.
-     *
-     * @param   actions
-     *          Packet actions
-     * @param   entries
-     *          Affected entries
-     */
-    public PacketPlayOutPlayerInfo(@NonNull EnumSet<EnumPlayerInfoAction> actions, @NonNull PlayerInfoData... entries) {
-        this.actions = actions;
-        this.entries = Arrays.asList(entries);
-    }
-
-    /**
-     * A subclass representing player list entry
-     */
-    @Data @AllArgsConstructor
-    public static class PlayerInfoData {
-
-        /** Real name of affected player */
-        private String name;
-
-        /** Player UUID */
-        @NonNull private UUID uniqueId;
-
-        /** Player's skin, null for empty skin */
-        private Skin skin;
-
-        /** I have no idea what this is */
-        private boolean listed;
-
-        /** Latency */
-        private int latency;
-
-        /** GameMode */
-        private EnumGamemode gameMode = EnumGamemode.SURVIVAL; //ProtocolLib causes NPE even when action does not use GameMode
-
-        /** 
-         * Display name displayed in TabList. Using {@code null} results in no display name
-         * and scoreboard team prefix/suffix being visible in TabList instead.
-         */
-        private IChatBaseComponent displayName;
-
-        /** Chat session ID */
-        private UUID chatSessionId;
-
-        /** Player's chat signing key */
-        private Object profilePublicKey;
-
-        /**
-         * Constructs new instance with given parameters. Suitable for 
-         * {@link EnumPlayerInfoAction#UPDATE_GAME_MODE} action
-         * 
-         * @param   uniqueId
-         *          Player's uuid
-         * @param   gameMode
-         *          Player's GameMode
-         */
-        public PlayerInfoData(@NonNull UUID uniqueId, EnumGamemode gameMode) {
-            this.uniqueId = uniqueId;
-            this.gameMode = gameMode;
-        }
-
-        /**
-         * Constructs new instance with given parameters. Suitable for 
-         * {@link EnumPlayerInfoAction#UPDATE_LATENCY} action
-         * 
-         * @param   uniqueId
-         *          Player's uuid
-         * @param   latency
-         *          Player's ping
-         */
-        public PlayerInfoData(@NonNull UUID uniqueId, int latency) {
-            this.uniqueId = uniqueId;
-            this.latency = latency;
-        }
-
-        /**
-         * Constructs new instance with given parameters. Suitable for 
-         * {@link EnumPlayerInfoAction#UPDATE_DISPLAY_NAME} action
-         * 
-         * @param   uniqueId
-         *          Player's uuid
-         * @param   displayName
-         *          Player's display name
-         */
-        public PlayerInfoData(@NonNull UUID uniqueId, IChatBaseComponent displayName) {
-            this.uniqueId = uniqueId;
-            this.displayName = displayName;
-        }
-
-        /**
-         * Constructs new instance with given parameter. Suitable for 
-         * {@link EnumPlayerInfoAction#REMOVE_PLAYER} action
-         * 
-         * @param   uniqueId
-         *          Player's uuid
-         */
-        public PlayerInfoData(@NonNull UUID uniqueId) {
-            this.uniqueId = uniqueId;
-        }
-    }
-
-    /**
-     * En enum representing packet action
-     */
-    public enum EnumPlayerInfoAction {
-
-        ADD_PLAYER,
-        INITIALIZE_CHAT,
-        UPDATE_GAME_MODE,
-        UPDATE_LISTED,
-        UPDATE_LATENCY,
-        UPDATE_DISPLAY_NAME,
-        REMOVE_PLAYER
-    }
-
-    /**
-     * An enum representing GameMode
-     */
-    public enum EnumGamemode {
-
-        NOT_SET,
-        SURVIVAL,
-        CREATIVE,
-        ADVENTURE,
-        SPECTATOR;
-
-        /** Value array to iterate over to avoid array creations on each call */
-        public static final EnumGamemode[] VALUES = values();
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutPlayerListHeaderFooter.java

@@ -1,33 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.chat.IChatBaseComponent;
-
-/**
- * A class representing platform specific packet class
- */
-@Data @AllArgsConstructor
-public class PacketPlayOutPlayerListHeaderFooter implements TabPacket {
-
-    /** TabList header */
-    @NonNull private final IChatBaseComponent header;
-
-    /** TabList footer */
-    @NonNull private final IChatBaseComponent footer;
-
-    /**
-     * Constructs new instance with given parameters. They are converted to {@link IChatBaseComponent}
-     * using {@link IChatBaseComponent#optimizedComponent(String)} method.
-     * 
-     * @param   header
-     *          TabList header
-     * @param   footer
-     *          TabList footer
-     */
-    public PacketPlayOutPlayerListHeaderFooter(@NonNull String header, @NonNull String footer) {
-        this.header = IChatBaseComponent.optimizedComponent(header);
-        this.footer = IChatBaseComponent.optimizedComponent(footer);
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardDisplayObjective.java

@@ -1,22 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.Data;
-import lombok.NonNull;
-
-/**
- * A class representing platform specific packet class
- */
-@Data
-public class PacketPlayOutScoreboardDisplayObjective implements TabPacket {
-
-    /**
-     * Display slot.
-     * 0 = PlayerList,
-     * 1 = SideBar,
-     * 2 = BelowName.
-     */
-    private final int slot;
-
-    /** Up to 16 characters long objective name */
-    @NonNull private final String objectiveName;
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardObjective.java

@@ -1,55 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.util.Preconditions;
-
-/**
- * A class representing platform specific packet class
- */
-@Data @AllArgsConstructor
-public class PacketPlayOutScoreboardObjective implements TabPacket {
-
-    /**
-     * Packet action.
-     * 0 = register,
-     * 1 = unregister,
-     * 2 = update title
-     */
-    private final int action;
-
-    /** Up to 16 characters long objective name */
-    @NonNull private final String objectiveName;
-
-    /** Display name */
-    private final String displayName;
-
-    /** Display type, only takes effect in PlayerList */
-    private final EnumScoreboardHealthDisplay renderType;
-
-    /**
-     * Constructs new packet with given objective name and 1 (unregister) action.
-     *
-     * @param   objectiveName
-     *          objective name, up to 16 characters long
-     * @throws  IllegalArgumentException
-     *          if {@code objectiveName} is null or longer than 16 characters
-     */
-    public PacketPlayOutScoreboardObjective(@NonNull String objectiveName) {
-        Preconditions.checkMaxLength(objectiveName, 16, "objective name");
-        this.objectiveName = objectiveName;
-        this.displayName = ""; //avoiding NPE on <1.7
-        this.action = 1;
-        this.renderType = null;
-    }
-
-    /**
-     * An enum representing available display types.
-     * They only take effect in PlayerList position.
-     */
-    public enum EnumScoreboardHealthDisplay {
-
-        INTEGER, HEARTS
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardScore.java

@@ -1,32 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.Data;
-import lombok.NonNull;
-
-/**
- * A class representing platform specific packet class
- */
-@Data
-public class PacketPlayOutScoreboardScore implements TabPacket {
-
-    /** Packet action */
-    @NonNull private final Action action;
-
-    /** Objective name */
-    @NonNull private final String objectiveName;
-
-    /** Affected player */
-    @NonNull private final String player;
-
-    /** Player's score */
-    private final int score;
-
-    /**
-     * An enum representing action types
-     */
-    public enum Action {
-
-        CHANGE,
-        REMOVE
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/PacketPlayOutScoreboardTeam.java

@@ -1,180 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.Data;
-import lombok.NonNull;
-import me.neznamy.tab.api.chat.EnumChatFormat;
-import me.neznamy.tab.api.util.Preconditions;
-
-import java.util.Collection;
-import java.util.Collections;
-
-/**
- * A class representing platform specific packet class
- */
-@Data
-public class PacketPlayOutScoreboardTeam implements TabPacket {
-
-    /**
-     * Up to 16 characters long team name.
-     * It is used to sort players alphabetically in TabList by team names.
-     * Team-less players appear on top, sorted by usernames.
-     * Players with teams are below them, players of the same team are
-     * sorted alphabetically by usernames.
-     */
-    @NonNull private final String name;
-
-    /** Team prefix, limited to 16 characters, on <1.13 */
-    private String playerPrefix;
-
-    /** Team suffix, limited to 16 characters, on <1.13 */
-    private String playerSuffix;
-
-    /** 
-     * NameTag visibility rule since 1.8. Possible options are:
-     * {@code always}, {@code hideForOtherTeams}, {@code hideForOwnTeam}, {@code never}
-     */
-    private String nameTagVisibility;
-
-    /**
-     * Collision rule added in 1.9. Possible options are:
-     * {@code always}, {@code pushOtherTeams}, {@code pushOwnTeam}, {@code never}
-     */
-    private String collisionRule;
-
-    /**
-     * Team color field added in 1.13. It determines name color,
-     * prefix and suffix color start.
-     */
-    private EnumChatFormat color;
-
-    /** 
-     * Affected entities. For players, it is their name, for other entities their UUID
-     * Player name length is limited to 16 characters for <1.8, 40 characters since 1.8.
-     * Entity UUID option was added in 1.8.
-     */
-    @NonNull private Collection<String> players = Collections.emptyList();
-
-    /**
-     * Packet action.
-     * 0 = create team,
-     * 1 = remove team,
-     * 2 = update team info,
-     * 3 = add entries,
-     * 4 = remove entries
-     */
-    private final int action;
-
-    /**
-     * Bit mask.
-     * 0x01: Allow friendly fire,
-     * 0x02: Can see invisible players on the same team.
-     */
-    private int options;
-
-    /**
-     * Constructs new instance with given parameters. Private constructor used
-     * internally to validate team name and set action.
-     * 
-     * @param   action
-     *          Packet action (0 = create team, 1 = remove team, 2 = update team info,
-     *          3 = add entries, 4 = remove entries)
-     * @param   name
-     *          Team name, up to 16 characters long
-     * @throws  IllegalArgumentException
-     *          if {@code name} is null, empty or longer than 16 characters
-     */
-    private PacketPlayOutScoreboardTeam(int action, @NonNull String name) {
-        Preconditions.checkMaxLength(name, 16, "team name");
-        this.action = action;
-        this.name = name;
-    }
-
-    /**
-     * Constructs new instance with given parameters and 0 (CREATE) action
-     * 
-     * @param   team
-     *          Team name, up to 16 characters long
-     * @param   prefix
-     *          Prefix of players in team
-     * @param   suffix
-     *          Suffix of players in team
-     * @param   visibility
-     *          NameTag visibility rule
-     * @param   collision
-     *          Collision rule
-     * @param   players
-     *          Affected entities
-     * @param   options
-     *          bitmask of team options
-     * @throws  IllegalArgumentException
-     *          if {@code name} is null, empty or longer than 16 characters
-     */
-    public PacketPlayOutScoreboardTeam(String team, @NonNull String prefix, @NonNull String suffix, String visibility,
-                                       String collision, @NonNull Collection<String> players, int options) {
-        this(0, team);
-        this.playerPrefix = prefix;
-        this.playerSuffix = suffix;
-        this.nameTagVisibility = visibility;
-        this.collisionRule = collision;
-        this.players = players;
-        this.options = options;
-    }
-
-    /**
-     * Constructs new instance with given parameters and 1 (REMOVE) action
-     * 
-     * @param   team
-     *          Team name, up to 16 characters long
-     * @throws  IllegalArgumentException
-     *          if {@code name} is null, empty or longer than 16 characters
-     */
-    public PacketPlayOutScoreboardTeam(String team) {
-        this(1, team);
-    }
-
-    /**
-     * Constructs new instance with given parameters and 2 (UPDATE_TEAM_INFO) action
-     * 
-     * @param   team
-     *          Team name, up to 16 characters long
-     * @param   prefix
-     *          Prefix of players in team
-     * @param   suffix
-     *          Suffix of players in team
-     * @param   visibility
-     *          NameTag visibility rule
-     * @param   collision
-     *          Collision rule
-     * @param   options
-     *          bitmask of team options
-     * @throws  IllegalArgumentException
-     *          if {@code name} is null, empty or longer than 16 characters
-     */
-    public PacketPlayOutScoreboardTeam(String team, @NonNull String prefix, @NonNull String suffix,
-                                       String visibility, String collision, int options) {
-        this(2, team);
-        this.playerPrefix = prefix;
-        this.playerSuffix = suffix;
-        this.nameTagVisibility = visibility;
-        this.collisionRule = collision;
-        this.options = options;
-    }
-
-    /**
-     * Constructs new instance with given parameters and 3 (ADD_PLAYERS) if {@code add} is {@code true}, 
-     * 4 (REMOVE_PLAYERS) if {@code add} is {@code false} action.
-     * 
-     * @param   team
-     *          Team name, up to 16 characters long
-     * @param   players
-     *          Affected entities
-     * @param   add
-     *          {@code true} if players should be added, {@code false} if removed from team
-     * @throws  IllegalArgumentException
-     *          if {@code name} is null, empty or longer than 16 characters
-     */
-    public PacketPlayOutScoreboardTeam(String team, @NonNull Collection<String> players, boolean add) {
-        this(add ? 3 : 4, team);
-        this.players = players;
-    }
-}

api/src/main/java/me/neznamy/tab/api/protocol/Skin.java

@@ -1,18 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-import lombok.AllArgsConstructor;
-import lombok.Data;
-import lombok.NonNull;
-
-/**
- * Class representing a minecraft skin as a value - signature pair.
- */
-@Data @AllArgsConstructor
-public class Skin {
-
-    /** Skin value */
-    @NonNull private final String value;
-
-    /** Skin signature, can be null */
-    private final String signature;
-}

api/src/main/java/me/neznamy/tab/api/protocol/TabPacket.java

@@ -1,17 +0,0 @@
-package me.neznamy.tab.api.protocol;
-
-/**
- * Interface representing a packet that can be sent to client independently of platform.
- * It is technically empty, existence is only present to restrict type access
- * when sending packets to player, so {@link me.neznamy.tab.api.TabPlayer#sendCustomPacket(TabPacket)} cannot
- * be called with an actual packet.
- */
-public interface TabPacket {
-
-    /**
-     * Returns user-friendly string representation of the packet
-     *
-     * @return  user-friendly string representation of the packet
-     */
-    String toString();
-}

api/src/main/java/me/neznamy/tab/api/scoreboard/Line.java

@@ -1,5 +1,8 @@
 package me.neznamy.tab.api.scoreboard;
 
+import lombok.NonNull;
+import org.jetbrains.annotations.NotNull;
+
 /**
  * An interface allowing to work with a line of
  * text in scoreboard.
@@ -13,7 +16,7 @@ public interface Line {
      * 
      * @return  raw text of this line
      */
-    String getText();
+    @NotNull String getText();
     
     /**
      * Changes text to new value. Supports placeholders, which are
@@ -25,5 +28,5 @@ public interface Line {
      * @param   text
      *          Raw text to display in the line
      */
-    void setText(String text);
+    void setText(@NonNull String text);
 }

api/src/main/java/me/neznamy/tab/api/scoreboard/Scoreboard.java

@@ -1,5 +1,8 @@
 package me.neznamy.tab.api.scoreboard;
 
+import lombok.NonNull;
+import org.jetbrains.annotations.NotNull;
+
 import java.util.List;
 
 /**
@@ -8,6 +11,7 @@ import java.util.List;
  * {@link ScoreboardManager#createScoreboard(String, String, List)},
  * for scoreboards from config {@link ScoreboardManager#getRegisteredScoreboards()}.
  */
+@SuppressWarnings("unused") // API class
 public interface Scoreboard {
 
     /**
@@ -17,7 +21,7 @@ public interface Scoreboard {
      * 
      * @return  custom name of this scoreboard
      */
-    String getName();
+    @NotNull String getName();
 
     /**
      * Returns raw title of this scoreboard. Placeholders stay in their
@@ -26,7 +30,7 @@ public interface Scoreboard {
      * @return  scoreboard title
      * @see     #setTitle(String)
      */
-    String getTitle();
+    @NotNull String getTitle();
 
     /**
      * Sets title to specified value. Placeholders are refreshed automatically
@@ -43,7 +47,7 @@ public interface Scoreboard {
      *          New title to use with placeholder support
      * @see     #getTitle()
      */
-    void setTitle(String title);
+    void setTitle(@NonNull String title);
 
     /**
      * Returns list of lines in this scoreboard in the order they appear
@@ -54,7 +58,7 @@ public interface Scoreboard {
      * @see     #addLine(String)
      * @see     #removeLine(int)
      */
-    List<Line> getLines();
+    @NotNull List<Line> getLines();
 
     /**
      * Adds line with specified text on the bottom of scoreboard. Supports
@@ -65,7 +69,7 @@ public interface Scoreboard {
      * @see     #getLines()
      * @see     #removeLine(int)
      */
-    void addLine(String text);
+    void addLine(@NonNull String text);
 
     /**
      * Removes line with specified index. Index starts at {@code 0} and ends at 

api/src/main/java/me/neznamy/tab/api/scoreboard/ScoreboardManager.java

@@ -3,7 +3,10 @@ package me.neznamy.tab.api.scoreboard;
 import java.util.List;
 import java.util.Map;
 
+import lombok.NonNull;
 import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Interface allowing work with scoreboards, such as creating,
@@ -11,8 +14,9 @@ import me.neznamy.tab.api.TabPlayer;
  * <p>
  * Instance can be obtained using {@link me.neznamy.tab.api.TabAPI#getScoreboardManager()}.
  * This requires the scoreboard feature to be enabled in config,
- * the method will return null otherwise.
+ * the method will return {@code null} otherwise.
  */
+@SuppressWarnings("unused") // API class
 public interface ScoreboardManager {
 
     /**
@@ -39,7 +43,7 @@ public interface ScoreboardManager {
      * @throws  NullPointerException
      *          if {@code name} or {@code lines} is {@code null}
      */
-    Scoreboard createScoreboard(String name, String title, List<String> lines);
+    @NotNull Scoreboard createScoreboard(@NonNull String name, @NonNull String title, @NonNull List<String> lines);
     
     /**
      * Returns map of registered scoreboards via config and API.
@@ -49,7 +53,7 @@ public interface ScoreboardManager {
      * 
      * @return  map of registered scoreboards
      */
-    Map<String, Scoreboard> getRegisteredScoreboards();
+    @NotNull Map<String, Scoreboard> getRegisteredScoreboards();
     
     /**
      * Displays scoreboard to defined player. This will disable all display
@@ -66,7 +70,7 @@ public interface ScoreboardManager {
      * @see     #hasCustomScoreboard(TabPlayer)
      * @see     #resetScoreboard(TabPlayer)
      */
-    void showScoreboard(TabPlayer player, Scoreboard scoreboard);
+    void showScoreboard(@NonNull TabPlayer player, @NonNull Scoreboard scoreboard);
     
     /**
      * Returns {@code true} if player has custom scoreboard set using
@@ -79,7 +83,7 @@ public interface ScoreboardManager {
      * @see      #showScoreboard(TabPlayer, Scoreboard)
      * @see     #resetScoreboard(TabPlayer)
      */
-    boolean hasCustomScoreboard(TabPlayer player);
+    boolean hasCustomScoreboard(@NonNull TabPlayer player);
     
     /**
      * Hides custom scoreboard sent using {@link #showScoreboard(TabPlayer, Scoreboard)}
@@ -91,7 +95,7 @@ public interface ScoreboardManager {
      * @see     #showScoreboard(TabPlayer, Scoreboard)
      * @see     #hasCustomScoreboard(TabPlayer)
      */
-    void resetScoreboard(TabPlayer player);
+    void resetScoreboard(@NonNull TabPlayer player);
     
     /**
      * Returns {@code true} if player has scoreboard enabled, {@code false} 
@@ -105,7 +109,7 @@ public interface ScoreboardManager {
      * @see     #setScoreboardVisible(TabPlayer, boolean, boolean)
      * @see     #toggleScoreboard(TabPlayer, boolean)
      */
-    boolean hasScoreboardVisible(TabPlayer player);
+    boolean hasScoreboardVisible(@NonNull TabPlayer player);
     
     /**
      * Sets scoreboard visibility of player to defined value. If visibility status
@@ -122,7 +126,7 @@ public interface ScoreboardManager {
      * @see     #toggleScoreboard(TabPlayer, boolean)
      * @see     #hasScoreboardVisible(TabPlayer)
      */
-    void setScoreboardVisible(TabPlayer player, boolean visible, boolean sendToggleMessage);
+    void setScoreboardVisible(@NonNull TabPlayer player, boolean visible, boolean sendToggleMessage);
     
     /**
      * Toggles scoreboard for specified player. If player had scoreboard visible,
@@ -136,7 +140,7 @@ public interface ScoreboardManager {
      * @see     #hasScoreboardVisible(TabPlayer)
      * @see     #setScoreboardVisible(TabPlayer, boolean, boolean)
      */
-    void toggleScoreboard(TabPlayer player, boolean sendToggleMessage);
+    void toggleScoreboard(@NonNull TabPlayer player, boolean sendToggleMessage);
     
     /**
      * Temporarily displays scoreboard to all players for specified amount of 
@@ -151,7 +155,7 @@ public interface ScoreboardManager {
      *          if no scoreboard was found with such name or {@code duration}
      *          is &lt; 0.
      */
-    void announceScoreboard(String scoreboard, int duration);
+    void announceScoreboard(@NonNull String scoreboard, int duration);
 
     /**
      * Returns player's currently displayed scoreboard. This can be either with
@@ -162,5 +166,5 @@ public interface ScoreboardManager {
      *          player to get active scoreboard of
      * @return  player's active scoreboard or {@code null} if player has no scoreboard
      */
-    Scoreboard getActiveScoreboard(TabPlayer player);
+    @Nullable Scoreboard getActiveScoreboard(@NonNull TabPlayer player);
 }

api/src/main/java/me/neznamy/tab/api/tablist/HeaderFooterManager.java

@@ -1,4 +1,9 @@
-package me.neznamy.tab.api;
+package me.neznamy.tab.api.tablist;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Interface allowing to send header/footer to players.
@@ -7,39 +12,40 @@ package me.neznamy.tab.api;
  * This requires the Header/footer feature to be enabled in config, otherwise
  * the method will return {@code null}.
  */
+@SuppressWarnings("unused") // API class
 public interface HeaderFooterManager {
 
     /**
      * Sets raw value of header to specified value. This overrides plugin
      * configuration until reset is called. Has full placeholder support
      * and will send update packet whenever a placeholder used inside
-     * changes its value.
+     * changes its value. Use {@code null} to reset value back to original.
      *
      * @param   player
      *          Player to set header for
      * @param   header
      *          Raw header value
      */
-    void setHeader(TabPlayer player, String header);
+    void setHeader(@NonNull TabPlayer player, @Nullable String header);
 
     /**
      * Sets raw value of footer to specified value. This overrides plugin
      * configuration until reset is called. Has full placeholder support
      * and will send update packet whenever a placeholder used inside
-     * changes its value.
+     * changes its value. Use {@code null} to reset value back to original.
      *
      * @param   player
      *          Player to set header for
      * @param   footer
      *          Raw footer value
      */
-    void setFooter(TabPlayer player, String footer);
+    void setFooter(@NonNull TabPlayer player, @Nullable String footer);
 
     /**
      * Sets raw value of header and footer to specified values. This overrides plugin
      * configuration until reset is called. Has full placeholder support
      * and will send update packet whenever a placeholder used inside
-     * changes its value.
+     * changes its value. Use {@code null} to reset value back to original.
      *
      * @param   player
      *          Player to set header for
@@ -48,35 +54,5 @@ public interface HeaderFooterManager {
      * @param   footer
      *          Raw footer value
      */
-    void setHeaderAndFooter(TabPlayer player, String header, String footer);
-
-    /**
-     * Resets header value previously set using {@link #setHeader(TabPlayer, String)}
-     * or {@link #setHeaderAndFooter(TabPlayer, String, String)} and restores internal
-     * logic using configuration files.
-     *
-     * @param   player
-     *          Player to reset header for
-     */
-    void resetHeader(TabPlayer player);
-
-    /**
-     * Resets footer value previously set using {@link #setFooter(TabPlayer, String)}
-     * or {@link #setHeaderAndFooter(TabPlayer, String, String)} and restores internal
-     * logic using configuration files.
-     *
-     * @param   player
-     *          Player to reset header for
-     */
-    void resetFooter(TabPlayer player);
-
-    /**
-     * Resets values previously set using {@link #setHeader(TabPlayer, String)},
-     * {@link #setFooter(TabPlayer, String)} or {@link #setHeaderAndFooter(TabPlayer, String, String)}
-     * and restores internal logic using configuration files.
-     *
-     * @param   player
-     *          Player to reset header and footer for
-     */
-    void resetHeaderAndFooter(TabPlayer player);
+    void setHeaderAndFooter(@NonNull TabPlayer player, @Nullable String header, @Nullable String footer);
 }

api/src/main/java/me/neznamy/tab/api/tablist/SortingManager.java

@@ -0,0 +1,46 @@
+package me.neznamy.tab.api.tablist;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for managing player sorting by directly configuring
+ * team names of players. Instance can be obtained using
+ * {@link TabAPI#getSortingManager()}. If the feature is disabled,
+ * it will return {@code null}.
+ */
+@SuppressWarnings("unused") // API class
+public interface SortingManager {
+
+    /**
+     * Forces new team name for the player until this method is called again with null argument and
+     * performs all actions to change player's team name
+     *
+     * @param   player
+     *          player to set team name of
+     * @param   teamName
+     *          forced team name
+     */
+    void forceTeamName(@NonNull TabPlayer player, @Nullable String teamName);
+
+    /**
+     * Returns forced team name of player or null if not forced
+     *
+     * @param   player
+     *          player to check forced team name of
+     * @return  forced team name of player or null if not forced
+     */
+    @Nullable String getForcedTeamName(@NonNull TabPlayer player);
+
+    /**
+     * Returns original team name of the player set by the plugin.
+     *
+     * @param   player
+     *          Player to get team name of
+     * @return  Player's team name based on configuration.
+     */
+    @NotNull String getOriginalTeamName(@NonNull TabPlayer player);
+}

api/src/main/java/me/neznamy/tab/api/tablist/TabListFormatManager.java

@@ -1,92 +1,63 @@
-package me.neznamy.tab.api;
+package me.neznamy.tab.api.tablist;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
- * An interface allowing to modify tablist display names
+ * An interface allowing to modify TabList display names
  * of players.
  * <p>
- * Instance can be obtained using {@link TabAPI#getTablistFormatManager()}.
+ * Instance can be obtained using {@link TabAPI#getTabListFormatManager()}.
  * This requires the feature to be enabled in config, otherwise the method will
  * return {@code null}.
  */
-public interface TablistFormatManager {
+@SuppressWarnings("unused") // API class
+public interface TabListFormatManager {
 
     /**
      * Changes player's prefix to provided value. Supports placeholders,
-     * as well as any supported RGB formats.
+     * as well as any supported RGB formats. Use {@code null} to reset
+     * value back to original.
      *
      * @param   player
      *          player to change prefix of
      * @param   prefix
      *          new prefix value
-     * @see     #resetPrefix(TabPlayer)
      * @see     #getCustomPrefix(TabPlayer)
      * @see     #getOriginalPrefix(TabPlayer)
      */
-    void setPrefix(TabPlayer player, String prefix);
+    void setPrefix(@NonNull TabPlayer player, @Nullable String prefix);
 
     /**
      * Changes player's name to provided value. Supports placeholders,
-     * as well as any supported RGB formats.
+     * as well as any supported RGB formats. Use {@code null} to reset
+     * value back to original.
      *
      * @param   player
      *          player to change prefix of
      * @param   customName
      *          new customName value
-     * @see     #resetName(TabPlayer)
      * @see     #getCustomName(TabPlayer)
      * @see     #getOriginalName(TabPlayer)
      */
-    void setName(TabPlayer player, String customName);
+    void setName(@NonNull TabPlayer player, @Nullable String customName);
 
     /**
      * Changes player's suffix to provided value. Supports placeholders,
-     * as well as any supported RGB formats.
+     * as well as any supported RGB formats. Use {@code null} to reset
+     * value back to original.
      *
      * @param   player
      *          player to change prefix of
      * @param   suffix
      *          new suffix value
-     * @see     #resetSuffix(TabPlayer)
      * @see     #getCustomSuffix(TabPlayer)
      * @see     #getOriginalSuffix(TabPlayer)
      */
-    void setSuffix(TabPlayer player, String suffix);
-
-    /**
-     * Resets player's prefix previously assigned using {@link #setPrefix(TabPlayer, String)}
-     * method. If nothing was set, this method will not do anything.
-     *
-     * @param   player
-     *          player to reset prefix of
-     * @see     #setPrefix(TabPlayer, String)
-     * @see     #getCustomPrefix(TabPlayer)
-     * @see     #getOriginalPrefix(TabPlayer)
-     */
-    void resetPrefix(TabPlayer player);
-
-    /**
-     * Resets player's custom name previously assigned using {@link #setName(TabPlayer, String)}
-     * method. If nothing was set, this method will not do anything.
-     *
-     * @param   player
-     *          player to reset name of
-     * @see     #setName(TabPlayer, String)
-     * @see     #getCustomName(TabPlayer)
-     * @see     #getOriginalName(TabPlayer)
-     */
-    void resetName(TabPlayer player);
-
-    /**
-     * Resets player's suffix previously assigned using {@link #setSuffix(TabPlayer, String)}
-     * method. If nothing was set, this method will not do anything.
-     *
-     * @param   player
-     *          player to reset suffix of
-     * @see     #setSuffix(TabPlayer, String)
-     * @see     #getCustomSuffix(TabPlayer)
-     * @see     #getOriginalSuffix(TabPlayer)
-     */
-    void resetSuffix(TabPlayer player);
+    void setSuffix(@NonNull TabPlayer player, @Nullable String suffix);
 
     /**
      * Returns prefix assigned using {@link #setPrefix(TabPlayer, String)} method.
@@ -96,10 +67,9 @@ public interface TablistFormatManager {
      *          player to get custom prefix of
      * @return  player's custom prefix or {@code null} if not defined
      * @see     #setPrefix(TabPlayer, String)
-     * @see     #resetPrefix(TabPlayer)
      * @see     #getOriginalPrefix(TabPlayer)
      */
-    String getCustomPrefix(TabPlayer player);
+    @Nullable String getCustomPrefix(@NonNull TabPlayer player);
 
     /**
      * Returns custom name assigned using {@link #setName(TabPlayer, String)} method.
@@ -109,10 +79,9 @@ public interface TablistFormatManager {
      *          player to get custom name of
      * @return  player's custom name or {@code null} if not defined
      * @see     #setName(TabPlayer, String)
-     * @see     #resetName(TabPlayer)
      * @see     #getOriginalName(TabPlayer)
      */
-    String getCustomName(TabPlayer player);
+    @Nullable String getCustomName(@NonNull TabPlayer player);
 
     /**
      * Returns suffix assigned using {@link #setSuffix(TabPlayer, String)} method.
@@ -122,10 +91,9 @@ public interface TablistFormatManager {
      *          player to get custom suffix of
      * @return  player's custom suffix or {@code null} if not defined
      * @see     #setSuffix(TabPlayer, String)
-     * @see     #resetSuffix(TabPlayer)
      * @see     #getOriginalSuffix(TabPlayer)
      */
-    String getCustomSuffix(TabPlayer player);
+    @Nullable String getCustomSuffix(@NonNull TabPlayer player);
 
     /**
      * Returns player's original prefix applied using plugin's internal logic.
@@ -135,10 +103,9 @@ public interface TablistFormatManager {
      *          player to get original prefix of
      * @return  player's original prefix
      * @see     #setPrefix(TabPlayer, String)
-     * @see     #resetPrefix(TabPlayer)
      * @see     #getCustomPrefix(TabPlayer)
      */
-    String getOriginalPrefix(TabPlayer player);
+    @NotNull String getOriginalPrefix(@NonNull TabPlayer player);
 
     /**
      * Returns player's original name applied using plugin's internal logic.
@@ -148,10 +115,9 @@ public interface TablistFormatManager {
      *          player to get original name of
      * @return  player's original name
      * @see     #setName(TabPlayer, String)
-     * @see     #resetName(TabPlayer)
      * @see     #getCustomName(TabPlayer)
      */
-    String getOriginalName(TabPlayer player);
+    @NotNull String getOriginalName(@NonNull TabPlayer player);
 
     /**
      * Returns player's original suffix applied using plugin's internal logic.
@@ -161,8 +127,7 @@ public interface TablistFormatManager {
      *          player to get original suffix of
      * @return  player's original suffix
      * @see     #setSuffix(TabPlayer, String)
-     * @see     #resetSuffix(TabPlayer)
      * @see     #getCustomSuffix(TabPlayer)
      */
-    String getOriginalSuffix(TabPlayer player);
+    @NotNull String getOriginalSuffix(@NonNull TabPlayer player);
 }

api/src/main/java/me/neznamy/tab/api/tablist/layout/Layout.java

@@ -0,0 +1,79 @@
+package me.neznamy.tab.api.tablist.layout;
+
+import lombok.NonNull;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface representing a layout.
+ */
+@SuppressWarnings("unused") // API class
+public interface Layout {
+
+    /**
+     * Returns name of the layout.
+     *
+     * @return  name of the layout
+     */
+    @NotNull String getName();
+
+    /**
+     * Adds fixed slot with specified parameters
+     *
+     * @param   slot
+     *          Slot (1-80)
+     * @param   text
+     *          Text to display
+     */
+    void addFixedSlot(int slot, @NonNull String text);
+
+    /**
+     * Adds fixed slot with specified parameters
+     *
+     * @param   slot
+     *          Slot (1-80)
+     * @param   text
+     *          Text to display
+     * @param   skin
+     *          Skin definition like in config
+     */
+    void addFixedSlot(int slot, @NonNull String text, @NonNull String skin);
+
+    /**
+     * Adds fixed slot with specified parameters
+     *
+     * @param   slot
+     *          Slot (1-80)
+     * @param   text
+     *          Text to display
+     * @param   ping
+     *          Slot's ping
+     */
+    void addFixedSlot(int slot, @NonNull String text, int ping);
+
+    /**
+     * Adds fixed slot with specified parameters
+     *
+     * @param   slot
+     *          Slot (1-80)
+     * @param   text
+     *          Text to display
+     * @param   skin
+     *          Skin definition like in config
+     * @param   ping
+     *          Slot's ping
+     */
+    void addFixedSlot(int slot, @NonNull String text, @NonNull String skin, int ping);
+
+    /**
+     * Adds a player group.
+     *
+     * @param   condition
+     *          Condition that must be met for player to appear in the group.
+     *          May be null for no requirement. Syntax is like in config -
+     *          either condition name or short format.
+     * @param   slots
+     *          Slots for this player group
+     */
+    void addGroup(@Nullable String condition, int[] slots);
+}

api/src/main/java/me/neznamy/tab/api/tablist/layout/LayoutManager.java

@@ -0,0 +1,45 @@
+package me.neznamy.tab.api.tablist.layout;
+
+import lombok.NonNull;
+import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.api.TabPlayer;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Interface for working with layouts. Instance can be obtained using
+ * {@link TabAPI#getLayoutManager()}. If the feature is disabled in
+ * config, it will return {@code null}.
+ */
+@SuppressWarnings("unused") // API class
+public interface LayoutManager {
+
+    /**
+     * Creates new layout
+     *
+     * @param   name
+     *          Unique layout name
+     * @return  Created layout
+     */
+    Layout createNewLayout(String name);
+
+    /**
+     * Sends layout to player. Set to {@code null} to make player not see
+     * any layout, but default TabList instead.
+     *
+     * @param   player
+     *          Player to send layout to
+     * @param   layout
+     *          Layout to send
+     * @see     #resetLayout(TabPlayer)
+     */
+    void sendLayout(@NonNull TabPlayer player, @Nullable Layout layout);
+
+    /**
+     * Reset layout back to original one based on configuration.
+     *
+     * @param   player
+     *          Player to reset layout for
+     * @see     #sendLayout(TabPlayer, Layout)
+     */
+    void resetLayout(@NonNull TabPlayer player);
+}

api/src/main/java/me/neznamy/tab/api/task/ThreadManager.java

@@ -1,96 +0,0 @@
-package me.neznamy.tab.api.task;
-
-import java.util.concurrent.Future;
-
-import me.neznamy.tab.api.TabFeature;
-
-/**
- * Manager for scheduling and executing tasks in TAB's
- * main thread to avoid concurrency issues.
- */
-public interface ThreadManager {
-
-    /**
-     * Starts a task in new thread and measures how long it took to process
-     *
-     * @param   feature
-     *          feature to add cpu usage to
-     * @param   type
-     *          usage type to add cpu usage to
-     * @param   task
-     *          the task
-     */
-    Future<Void> runMeasuredTask(TabFeature feature, String type, Runnable task);
-
-    /**
-     * Starts a task in new thread and measures how long it took to process
-     *
-     * @param   feature
-     *          feature to add cpu usage to
-     * @param   type
-     *          usage type to add cpu usage to
-     * @param   task
-     *          the task
-     */
-    Future<Void> runMeasuredTask(String feature, String type, Runnable task);
-
-    /**
-     * Runs task in a new thread
-     *
-     * @param   task
-     *          the task
-     */
-    Future<Void> runTask(Runnable task);
-
-    /**
-     * Starts a new task with defined repeat interval that measures cpu usage
-     *
-     * @param   intervalMilliseconds
-     *          task interval
-     * @param   feature
-     *          feature to add cpu usage to
-     * @param   type
-     *          usage type to add cpu usage to
-     * @param   task
-     *          the task
-     * @return  Future representing the submitted task
-     */
-    Future<?> startRepeatingMeasuredTask(int intervalMilliseconds, TabFeature feature, String type, Runnable task);
-
-    /**
-     * Starts a new task with defined repeat interval
-     *
-     * @param   intervalMilliseconds
-     *          task interval
-     * @param   task
-     *          the task
-     * @return  Future representing the submitted task
-     */
-    Future<?> startRepeatingTask(int intervalMilliseconds, Runnable task);
-
-    /**
-     * Runs task with a delay and measures how long it took to process
-     *
-     * @param   delayMilliseconds
-     *          how long to run the task after
-     * @param   feature
-     *          feature to add cpu usage to
-     * @param   type
-     *          usage type to add cpu usage to
-     * @param   task
-     *          the task
-     * @return  Future representing the submitted task
-     */
-    Future<?> runTaskLater(int delayMilliseconds, TabFeature feature, String type, Runnable task);
-
-    /**
-     * Runs task with a delay
-     *
-     * @param   delayMilliseconds
-     *          how long to run the task after
-     * @param   task
-     *          the task
-     * @return  Future representing the submitted task
-     */
-    Future<?> runTaskLater(int delayMilliseconds, Runnable task);
-}

api/src/main/java/me/neznamy/tab/api/team/TeamManager.java

@@ -1,182 +0,0 @@
-package me.neznamy.tab.api.team;
-
-import me.neznamy.tab.api.TabPlayer;
-
-public interface TeamManager {
-
-    /**
-     * Makes player's NameTag globally invisible
-     *
-     * @param   player
-     *          player to hide nametag of
-     * @see     #showNametag(TabPlayer)
-     * @see     #hasHiddenNametag(TabPlayer)
-     */
-    void hideNametag(TabPlayer player);
-
-    /**
-     * Hides player's NameTag for specified player until it's shown again
-     *
-     * @param   player
-     *          player to hide nametag of
-     * @param   viewer
-     *          player to hide NameTag for
-     */
-    void hideNametag(TabPlayer player, TabPlayer viewer);
-
-    /**
-     * Makes player's NameTag visible again
-     *
-     * @param   player
-     *          player to show nametag of
-     * @see     #hideNametag(TabPlayer)
-     * @see     #hasHiddenNametag(TabPlayer)
-     */
-    void showNametag(TabPlayer player);
-
-    /**
-     * Shows player's NameTag for specified viewer if it was hidden before
-     *
-     * @param   player
-     *          player to show nametag of
-     * @param   viewer
-     *          player to show NameTag back for
-     */
-    void showNametag(TabPlayer player, TabPlayer viewer);
-
-    /**
-     * Return whether player has hidden NameTag or not
-     *
-     * @param   player
-     *          player to check nametag visibility status of
-     * @return  Whether player has hidden NameTag or not
-     * @see     #hideNametag(TabPlayer)
-     * @see     #showNametag(TabPlayer)
-     */
-    boolean hasHiddenNametag(TabPlayer player);
-
-    /**
-     * Returns true if NameTag is hidden for specified viewer, false if not
-     *
-     * @param   player
-     *          player to check visibility status of
-     * @param   viewer
-     *          player to check visibility status for
-     * @return  true if hidden, false if not
-     */
-    boolean hasHiddenNametag(TabPlayer player, TabPlayer viewer);
-
-    /**
-     * Unregisters player's team and no longer handles it, as well as disables anti-override for teams.
-     * This can be resumed using resumeTeamHandling(). If team handling was paused already, nothing happens.
-     *
-     * @param   player
-     *          player to pause team handling of
-     */
-    void pauseTeamHandling(TabPlayer player);
-
-    /**
-     * Resumes team handling if it was before paused using pauseTeamHandling(), if not, nothing happens
-     *
-     * @param   player
-     *          player to resume team handling of
-     */
-    void resumeTeamHandling(TabPlayer player);
-
-    /**
-     * Returns true if team handling is paused for this player using pauseTeamHandling(), false if not, or
-     * it was resumed already using resumeTeamHandling
-     *
-     * @param   player
-     *          player to check handling status of
-     * @return  true if paused, false if not
-     */
-    boolean hasTeamHandlingPaused(TabPlayer player);
-
-    /**
-     * Forces new team name for the player until this method is called again with null argument and
-     * performs all actions to change player's team name
-     *
-     * @param   player
-     *          player to set team name of
-     * @param   teamName
-     *          forced team name
-     */
-    void forceTeamName(TabPlayer player, String teamName);
-
-    /**
-     * Returns forced team name of player or null if not forced
-     *
-     * @param   player
-     *          player to check forced team name of
-     * @return  forced team name of player or null if not forced
-     */
-    String getForcedTeamName(TabPlayer player);
-
-
-    /**
-     * Forces collision rule for the player. Setting it to null will remove forced value
-     *
-     * @param   player
-     *          player to set collision rule of
-     * @param   collision
-     *          forced collision rule
-     */
-    void setCollisionRule(TabPlayer player, Boolean collision);
-
-    /**
-     * Returns forced collision rule or null if collision is not forced using setCollisionRule
-     *
-     * @param   player
-     *          player to get forced collision of
-     * @return  forced value or null if not forced
-     */
-    Boolean getCollisionRule(TabPlayer player);
-
-    /**
-     * Sends update team's properties packet of player's team to everyone
-     *
-     * @param   player
-     *          player to update team data of
-     */
-    void updateTeamData(TabPlayer player);
-
-    void setPrefix(TabPlayer player, String prefix);
-
-    void setSuffix(TabPlayer player, String suffix);
-
-    void resetPrefix(TabPlayer player);
-
-    void resetSuffix(TabPlayer player);
-
-    String getCustomPrefix(TabPlayer player);
-
-    String getCustomSuffix(TabPlayer player);
-
-    String getOriginalPrefix(TabPlayer player);
-
-    String getOriginalSuffix(TabPlayer player);
-
-    /**
-     * Toggles nametag visibility view on all players for specified player.
-     * On first call, nametags of all players will become invisible for specified
-     * player. On second call, they will become visible again.
-     *
-     * @param   player
-     *          player to toggle nametag visibility view for
-     * @param   sendToggleMessage
-     *          {@code true} if configured toggle message should be sent, {@code false} if not
-     */
-    void toggleNameTagVisibilityView(TabPlayer player, boolean sendToggleMessage);
-
-    /**
-     * Returns {@code true} if player has hidden nametags by either calling
-     * {@link #toggleNameTagVisibilityView(TabPlayer, boolean)} or using a command,
-     * {@code false} if not.
-     *
-     * @param   player
-     *          player to check
-     * @return  {@code true} if hidden, {@code false} if not
-     */
-    boolean hasHiddenNameTagVisibilityView(TabPlayer player);
-}

api/src/main/java/me/neznamy/tab/api/team/UnlimitedNametagManager.java

@@ -1,32 +0,0 @@
-package me.neznamy.tab.api.team;
-
-import java.util.List;
-
-import me.neznamy.tab.api.TabPlayer;
-
-public interface UnlimitedNametagManager extends TeamManager {
-
-    void disableArmorStands(TabPlayer player);
-    
-    void enableArmorStands(TabPlayer player);
-    
-    boolean hasDisabledArmorStands(TabPlayer player);
-
-    void setName(TabPlayer player, String customName);
-    
-    void setLine(TabPlayer player, String line, String value);
-
-    void resetName(TabPlayer player);
-    
-    void resetLine(TabPlayer player, String line);
-
-    String getCustomName(TabPlayer player);
-    
-    String getCustomLineValue(TabPlayer player, String line);
-
-    String getOriginalName(TabPlayer player);
-    
-    String getOriginalLineValue(TabPlayer player, String line);
-    
-    List<String> getDefinedLines();
-}

api/src/main/java/me/neznamy/tab/api/util/ComponentCache.java

@@ -1,30 +0,0 @@
-package me.neznamy.tab.api.util;
-
-import lombok.AllArgsConstructor;
-import me.neznamy.tab.api.ProtocolVersion;
-
-import java.util.HashMap;
-import java.util.Map;
-
-@AllArgsConstructor
-public class ComponentCache<K, V> {
-
-    private final int cacheSize;
-    private final BiFunctionWithException<K, ProtocolVersion, V> function;
-    private final Map<K, V> cacheModern = new HashMap<>();
-    private final Map<K, V> cacheLegacy = new HashMap<>();
-
-    public V get(K key, ProtocolVersion clientVersion) {
-        try {
-            if (key == null) return null;
-            Map<K, V> cache = clientVersion == null || clientVersion.getMinorVersion() >= 16 ? cacheModern : cacheLegacy;
-            if (cache.containsKey(key)) return cache.get(key);
-            V value = function.apply(key, clientVersion);
-            if (cache.size() > cacheSize) cache.clear();
-            cache.put(key, value);
-            return value;
-        } catch (ReflectiveOperationException e) {
-            throw new RuntimeException(e);
-        }
-    }
-}

api/src/main/java/me/neznamy/tab/api/util/Preconditions.java

@@ -1,62 +0,0 @@
-package me.neznamy.tab.api.util;
-
-import lombok.AccessLevel;
-import lombok.NoArgsConstructor;
-import lombok.NonNull;
-import me.neznamy.tab.api.TabPlayer;
-
-/**
- * Class with utility methods used in the plugin
- */
-@NoArgsConstructor(access = AccessLevel.PRIVATE)
-public class Preconditions {
-
-    /**
-     * Checks length of String and throws {@code IllegalArgumentException} if it is
-     * longer than limit.
-     *
-     * @param   string
-     *          String to check
-     * @param   maxLength
-     *          Maximum length of the string
-     * @param   name
-     *          Name of the variable to use in exception message
-     * @throws  IllegalArgumentException
-     *          if {@code string} is {@code null} or longer than {@code maxLength} characters
-     */
-    public static void checkMaxLength(@NonNull String string, int maxLength, String name) {
-        if (string.length() > maxLength) throw new IllegalArgumentException(name + " is longer than " + maxLength + " characters (" + string.length() + ")");
-    }
-
-    /**
-     * Checks number range and throws {@code IllegalArgumentException} if number
-     * is out of range.
-     *
-     * @param   number
-     *          Number to check
-     * @param   min
-     *          Minimum allowed value
-     * @param   max
-     *          Maximum allowed value
-     * @param   variable
-     *          Variable name to use in exception message
-     * @throws  IllegalArgumentException
-     *          if {@code number} is out of range ({@code number < min || number > max})
-     */
-    public static void checkRange(Number number, Number min, Number max, String variable) {
-        if (number.doubleValue() < min.doubleValue() || number.doubleValue() > max.doubleValue())
-            throw new IllegalArgumentException(variable + " index out of range (" + min + " - " + max + "), was " + number);
-    }
-
-    /**
-     * Checks if player is loaded and throws {@code IllegalStateException} if not.
-     *
-     * @param   player
-     *          Player to check
-     * @throws  IllegalStateException
-     *          If player is not loaded
-     */
-    public static void checkLoaded(TabPlayer player) {
-        if (!player.isLoaded()) throw new IllegalStateException("Player is not loaded yet. Try again later.");
-    }
-}

api/src/main/java/me/neznamy/tab/api/util/ReflectionUtils.java

@@ -1,24 +0,0 @@
-package me.neznamy.tab.api.util;
-
-/**
- * Utility class storing methods working with reflection
- */
-public class ReflectionUtils {
-
-    /**
-     * Returns {@code true} if class with given full name exists,
-     * {@code false} if not.
-     *
-     * @param   path
-     *          Full class path and name
-     * @return  {@code true} if exists, {@code false} if not
-     */
-    public static boolean classExists(String path) {
-        try {
-            Class.forName(path);
-            return true;
-        } catch (ClassNotFoundException | NullPointerException e) {
-            return false;
-        }
-    }
-}

api/src/main/java/me/neznamy/tab/api/util/SupplierWithException.java

@@ -1,12 +0,0 @@
-package me.neznamy.tab.api.util;
-
-/**
- * Supplier that can throw an exception
- *
- * @param   <T>
- *          Return class type
- */
-public interface SupplierWithException<T> {
-
-    T get() throws Exception;
-}

build-logic/build.gradle.kts

@@ -3,15 +3,7 @@ plugins {
 }
 
 dependencies {
-    implementation(libs.plugin.shadow)
-    implementation(libs.plugin.lombok)
-}
-
-dependencies {
-    compileOnly(files(libs::class.java.protectionDomain.codeSource.location))
-}
-
-java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
+    implementation("com.github.johnrengelman:shadow:8.1.1")
+    implementation("io.freefair.gradle:lombok-plugin:8.6")
+    implementation("fabric-loom:fabric-loom.gradle.plugin:1.6-SNAPSHOT")
 }

build-logic/settings.gradle.kts

@@ -2,15 +2,8 @@ rootProject.name = "build-logic"
 
 dependencyResolutionManagement {
     repositories {
+        maven("https://maven.fabricmc.net/")
         gradlePluginPortal()
         mavenCentral()
     }
-    // You're a great IDE IntelliJ, but sometimes you really annoy me. >:(
-//    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
-
-    versionCatalogs {
-        register("libs") {
-            from(files("../gradle/libs.versions.toml"))
-        }
-    }
 }

build-logic/src/main/kotlin/tab.base-conventions.gradle.kts

@@ -8,10 +8,12 @@ plugins {
 tasks {
     processResources {
         filter<ReplaceTokens>("tokens" to mapOf(
+            "id" to rootProject.ext.get("id")!!.toString(),
             "name" to rootProject.name,
             "version" to project.version,
             "description" to project.description,
-            "website" to rootProject.ext.get("website")!!.toString()
+            "website" to rootProject.ext.get("website")!!.toString(),
+            "author" to rootProject.ext.get("author")!!.toString()
         ))
     }
     javadoc {
@@ -29,6 +31,6 @@ tasks {
 
 java {
     toolchain {
-        languageVersion.set(JavaLanguageVersion.of(17))
+        languageVersion.set(JavaLanguageVersion.of(21))
     }
 }

build-logic/src/main/kotlin/tab.platform-conventions.gradle.kts

@@ -9,6 +9,7 @@ tasks {
         relocate("org.bstats", "me.neznamy.tab.libs.org.bstats")
         relocate("org.json.simple", "me.neznamy.tab.libs.org.json.simple")
         relocate("net.kyori.event", "me.neznamy.tab.libs.net.kyori.event")
-        relocate("me.neznamy.yamlassist", "me.neznamy.tab.libs.yamlassist")
+        relocate("me.neznamy.yamlassist", "me.neznamy.tab.libs.me.neznamy.yamlassist")
+        relocate("org.yaml.snakeyaml", "me.neznamy.tab.libs.org.yaml.snakeyaml")
     }
 }

build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 
 allprojects {
     group = "me.neznamy"
-    version = "3.3.1"
+    version = "4.1.4"
     description = "An all-in-one solution that works"
 
     ext.set("id", "tab")
@@ -15,10 +15,11 @@ allprojects {
 val platforms = setOf(
     projects.bukkit,
     projects.bungeecord,
-    projects.krypton,
     projects.velocity,
     projects.sponge7,
-    projects.sponge8
+    projects.sponge8,
+    projects.fabric,
+    projects.fabric.v1144
 ).map { it.dependencyProject }
 
 val special = setOf(

bukkit/build.gradle.kts

@@ -1,8 +1,18 @@
 dependencies {
     implementation(projects.shared)
-    implementation(libs.bstats.bukkit)
-    compileOnly(libs.bukkit)
-    compileOnly(libs.placeholderapi)
-    compileOnly(libs.vault)
-    compileOnly(libs.authlib)
+    implementation("org.bstats:bstats-bukkit:3.0.1")
+    compileOnly("org.purpurmc.purpur:purpur-api:1.16.5-R0.1-SNAPSHOT")
+    compileOnly("me.clip:placeholderapi:2.11.2")
+    compileOnly("com.mojang:authlib:1.5.25")
+    compileOnly("com.github.MilkBowl:VaultAPI:1.7") {
+        exclude("org.bukkit", "bukkit")
+    }
+    compileOnly("LibsDisguises:LibsDisguises:10.0.21") {
+        exclude("org.spigotmc", "spigot")
+        exclude("org.spigotmc", "spigot-api")
+        exclude("com.github.dmulloy2", "ProtocolLib")
+        exclude("org.ow2.asm", "asm")
+        exclude("net.md-5", "bungeecord-chat")
+    }
+    compileOnly("com.github.LeonMangler:PremiumVanishAPI:2.8.8")
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitEventListener.java

@@ -1,7 +1,10 @@
 package me.neznamy.tab.platforms.bukkit;
 
-import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.platforms.bukkit.platform.BukkitPlatform;
+import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.platform.EventListener;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
@@ -9,64 +12,60 @@ import org.bukkit.event.player.PlayerChangedWorldEvent;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.event.player.PlayerQuitEvent;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * The core for bukkit forwarding events into all enabled features
  */
-@RequiredArgsConstructor
-public class BukkitEventListener implements Listener {
+public class BukkitEventListener implements EventListener<Player>, Listener {
 
-    /** Platform instance */
-    private final BukkitPlatform platform;
-    
     /**
-     * Listener to PlayerQuitEvent to remove player data and forward the event to features
+     * Listens to player quit event.
      *
      * @param   e
-     *          quit event
+     *          Disconnect event
      */
     @EventHandler(priority = EventPriority.HIGHEST)
     public void onQuit(PlayerQuitEvent e) {
-        if (TabAPI.getInstance().isPluginDisabled()) return;
-        TabAPI.getInstance().getThreadManager().runTask(() -> TabAPI.getInstance().getFeatureManager().onQuit(TabAPI.getInstance().getPlayer(e.getPlayer().getUniqueId())));
-    }
-    
-    /**
-     * Listener to PlayerJoinEvent to create player data and forward the event to features
-     *
-     * @param   e
-     *          join event
-     */
-    @EventHandler(priority = EventPriority.LOWEST)
-    public void onJoin(PlayerJoinEvent e) {
-        if (TabAPI.getInstance().isPluginDisabled()) return;
-        TabAPI.getInstance().getThreadManager().runTask(() ->
-                TabAPI.getInstance().getFeatureManager().onJoin(new BukkitTabPlayer(e.getPlayer(), platform.getProtocolVersion(e.getPlayer()))));
+        quit(e.getPlayer().getUniqueId());
     }
 
     /**
-     * Listener to PlayerChangedWorldEvent to forward the event to features
+     * Listens to player join event.
      *
      * @param   e
-     *          world changed event
+     *          Join event
+     */
+    @EventHandler(priority = EventPriority.LOW)
+    public void onJoin(PlayerJoinEvent e) {
+        join(e.getPlayer());
+    }
+
+    /**
+     * Listens to world change event.
+     *
+     * @param   e
+     *          World change event
      */
     @EventHandler(priority = EventPriority.LOWEST)
     public void onWorldChange(PlayerChangedWorldEvent e) {
-        if (TabAPI.getInstance().isPluginDisabled()) return;
-        TabAPI.getInstance().getThreadManager().runTask(() ->
-                TabAPI.getInstance().getFeatureManager().onWorldChange(e.getPlayer().getUniqueId(), e.getPlayer().getWorld().getName()));
+        worldChange(e.getPlayer().getUniqueId(), e.getPlayer().getWorld().getName());
     }
 
     /**
-     * Listener to PlayerChangedWorldEvent to forward the event to features
+     * Listens to command event to potentially cancel it.
      *
      * @param   e
-     *          command preprocess event
+     *          Command event
      */
     @EventHandler
     public void onCommand(PlayerCommandPreprocessEvent e) {
-        if (TabAPI.getInstance().isPluginDisabled()) return;
-        if (TabAPI.getInstance().getFeatureManager().onCommand(
-                TabAPI.getInstance().getPlayer(e.getPlayer().getUniqueId()), e.getMessage())) e.setCancelled(true);
+        if (command(e.getPlayer().getUniqueId(), e.getMessage())) e.setCancelled(true);
     }
-}
+
+    @Override
+    @NotNull
+    public TabPlayer createPlayer(@NotNull Player player) {
+        return new BukkitTabPlayer((BukkitPlatform) TAB.getInstance().getPlatform(), player);
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPacketBuilder.java

@@ -1,98 +0,0 @@
-package me.neznamy.tab.platforms.bukkit;
-
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.protocol.*;
-import me.neznamy.tab.api.protocol.PacketPlayOutBoss.Action;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutSpawnEntityLivingStorage;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.*;
-import me.neznamy.tab.shared.backend.protocol.PacketPlayOutEntityDestroy;
-import me.neznamy.tab.shared.backend.protocol.PacketPlayOutEntityMetadata;
-import me.neznamy.tab.shared.backend.protocol.PacketPlayOutEntityTeleport;
-import me.neznamy.tab.shared.backend.protocol.PacketPlayOutSpawnEntityLiving;
-import org.bukkit.entity.EntityType;
-
-import java.util.UUID;
-
-public class BukkitPacketBuilder extends PacketBuilder {
-
-    {
-        buildMap.put(PacketPlayOutEntityMetadata.class, (packet, version) -> PacketPlayOutEntityMetadataStorage.build((PacketPlayOutEntityMetadata) packet));
-        buildMap.put(PacketPlayOutEntityTeleport.class, (packet, version) -> PacketPlayOutEntityTeleportStorage.build((PacketPlayOutEntityTeleport) packet));
-        buildMap.put(PacketPlayOutEntityDestroy.class, (packet, version) -> PacketPlayOutEntityDestroyStorage.build((PacketPlayOutEntityDestroy) packet));
-        buildMap.put(PacketPlayOutSpawnEntityLiving.class, (packet, version) -> PacketPlayOutSpawnEntityLivingStorage.build((PacketPlayOutSpawnEntityLiving) packet));
-        buildMap.put(PacketPlayOutPlayerListHeaderFooter.class, (packet, version) -> PacketPlayOutPlayerListHeaderFooterStorage.build((PacketPlayOutPlayerListHeaderFooter) packet, version));
-        buildMap.put(PacketPlayOutChat.class, (packet, version) -> PacketPlayOutChatStorage.build((PacketPlayOutChat) packet, version));
-        buildMap.put(PacketPlayOutScoreboardObjective.class, (packet, version) -> PacketPlayOutScoreboardObjectiveStorage.build((PacketPlayOutScoreboardObjective) packet, version));
-        buildMap.put(PacketPlayOutScoreboardDisplayObjective.class, (packet, version) -> PacketPlayOutScoreboardDisplayObjectiveStorage.build((PacketPlayOutScoreboardDisplayObjective) packet, version));
-        buildMap.put(PacketPlayOutScoreboardTeam.class, (packet, version) -> PacketPlayOutScoreboardTeamStorage.build((PacketPlayOutScoreboardTeam) packet, version));
-        buildMap.put(PacketPlayOutScoreboardScore.class, (packet, version) -> PacketPlayOutScoreboardScoreStorage.build((PacketPlayOutScoreboardScore) packet, version));
-    }
-
-    @Override
-    public Object build(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        if (NMSStorage.getInstance().getMinorVersion() >= 9 || clientVersion.getMinorVersion() >= 9) {
-            //1.9+ server or client, handled by bukkit api or ViaVersion
-            return packet;
-        }
-        //<1.9 client and server
-        return buildBossPacketEntity(packet, clientVersion);
-    }
-
-    @Override
-    public Object build(PacketPlayOutPlayerInfo packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return PacketPlayOutPlayerInfoStorage.build(packet, clientVersion);
-    }
-
-    @Override
-    public PacketPlayOutPlayerInfo readPlayerInfo(Object nmsPacket, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        return PacketPlayOutPlayerInfoStorage.read(nmsPacket);
-    }
-
-    @Override
-    public PacketPlayOutScoreboardObjective readObjective(Object nmsPacket) throws ReflectiveOperationException {
-        return PacketPlayOutScoreboardObjectiveStorage.read(nmsPacket);
-    }
-
-    @Override
-    public PacketPlayOutScoreboardDisplayObjective readDisplayObjective(Object nmsPacket) throws ReflectiveOperationException {
-        return PacketPlayOutScoreboardDisplayObjectiveStorage.read(nmsPacket);
-    }
-
-    /**
-     * Builds entity packet representing requested BossBar packet using Wither on 1.8- clients.
-     *
-     * @param   packet
-     *          packet to build
-     * @param   clientVersion
-     *          client version
-     * @return  entity BossBar packet
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    private Object buildBossPacketEntity(PacketPlayOutBoss packet, ProtocolVersion clientVersion) throws ReflectiveOperationException {
-        if (packet.getAction() == Action.UPDATE_STYLE) return null; //nothing to do here
-
-        int entityId = packet.getId().hashCode();
-        if (packet.getAction() == Action.REMOVE) {
-            return build(new PacketPlayOutEntityDestroy(entityId), clientVersion);
-        }
-        DataWatcher w = new DataWatcher();
-        if (packet.getAction() == Action.UPDATE_PCT || packet.getAction() == Action.ADD) {
-            float health = 300*packet.getPct();
-            if (health == 0) health = 1;
-            w.getHelper().setHealth(health);
-        }
-        if (packet.getAction() == Action.UPDATE_NAME || packet.getAction() == Action.ADD) {
-            w.getHelper().setCustomName(packet.getName(), clientVersion);
-        }
-        if (packet.getAction() == Action.ADD) {
-            w.getHelper().setEntityFlags((byte) 32);
-            w.getHelper().setWitherInvulnerableTime(880); // Magic number
-            return build(new PacketPlayOutSpawnEntityLiving(entityId, new UUID(0, 0), EntityType.WITHER, 0, 0, 0, 0, 0, w), clientVersion);
-        } else {
-            return build(new PacketPlayOutEntityMetadata(entityId, w), clientVersion);
-        }
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPipelineInjector.java

@@ -1,37 +1,25 @@
 package me.neznamy.tab.platforms.bukkit;
 
 import io.netty.channel.Channel;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.function.Function;
-
-import io.netty.channel.ChannelDuplexHandler;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelPromise;
-import lombok.AllArgsConstructor;
-import lombok.Getter;
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutPlayerInfoStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutScoreboardDisplayObjectiveStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutScoreboardObjectiveStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutScoreboardTeamStorage;
-import me.neznamy.tab.shared.TAB;
+import lombok.SneakyThrows;
+import me.neznamy.tab.platforms.bukkit.nms.BukkitReflection;
 import me.neznamy.tab.shared.features.injection.NettyPipelineInjector;
-import me.neznamy.tab.shared.features.sorting.Sorting;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import me.neznamy.tab.shared.util.FunctionWithException;
+import me.neznamy.tab.shared.util.ReflectionUtils;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
 
 /**
- * Pipeline injection for bukkit
+ * Pipeline injection for Bukkit 1.8+.
  */
 public class BukkitPipelineInjector extends NettyPipelineInjector {
 
-    /** NMS data storage */
-    private final NMSStorage nms = NMSStorage.getInstance();
-
-    @Getter private final Function<TabPlayer, ChannelDuplexHandler> channelFunction = BukkitChannelDuplexHandler::new;
+    /** Function for getting player's channel */
+    private static FunctionWithException<TabPlayer, Channel> getChannel;
 
     /**
      * Constructs new instance
@@ -40,117 +28,48 @@ public class BukkitPipelineInjector extends NettyPipelineInjector {
         super("packet_handler");
     }
 
-    @Override
-    protected Channel getChannel(TabPlayer player) {
-        final BukkitTabPlayer bukkit = (BukkitTabPlayer) player;
+    /**
+     * Attempts to load required classes, fields and methods and marks class as available.
+     * If something fails, error message is printed and class is not marked as available.
+     */
+    public static void tryLoad() {
         try {
-            if (nms.CHANNEL != null) return (Channel) nms.CHANNEL.get(nms.NETWORK_MANAGER.get(bukkit.getPlayerConnection()));
-        } catch (final IllegalAccessException exception) {
-            TAB.getInstance().getErrorManager().printError("Failed to get channel of " + bukkit.getName(), exception);
+            Class<?> NetworkManager = BukkitReflection.getClass("network.Connection", "network.NetworkManager", "NetworkManager");
+            Class<?> PlayerConnection = BukkitReflection.getClass("server.network.ServerGamePacketListenerImpl",
+                    "server.network.PlayerConnection", "PlayerConnection");
+            Class<?> EntityPlayer = BukkitReflection.getClass("server.level.ServerPlayer", "server.level.EntityPlayer", "EntityPlayer");
+            Method getHandle = BukkitReflection.getBukkitClass("entity.CraftPlayer").getMethod("getHandle");
+            Field PLAYER_CONNECTION = ReflectionUtils.getOnlyField(EntityPlayer, PlayerConnection);
+            Field NETWORK_MANAGER;
+            if (BukkitReflection.is1_20_2Plus()) {
+                NETWORK_MANAGER = ReflectionUtils.getOnlyField(PlayerConnection.getSuperclass(), NetworkManager);
+            } else {
+                NETWORK_MANAGER = ReflectionUtils.getOnlyField(PlayerConnection, NetworkManager);
+            }
+            Field CHANNEL = ReflectionUtils.getOnlyField(NetworkManager, Channel.class);
+            getChannel = player -> (Channel) CHANNEL.get(NETWORK_MANAGER.get(PLAYER_CONNECTION.get(getHandle.invoke(player.getPlayer()))));
+        } catch (Exception e) {
+            BukkitUtils.compatibilityError(e, "network channel injection", null,
+                    "Unlimited nametag mode not working and being replaced with regular nametags",
+                    "Anti-override for tablist & nametags not working",
+                    "Compatibility with nickname plugins changing player names will not work",
+                    "Scoreboard will not be checking for other plugins");
         }
-        return null;
     }
 
     /**
-     * Custom channel duplex handler override
+     * Returns {@code true} if pipeline injection is available, {@code false} if not.
+     *
+     * @return  {@code true} if pipeline injection is available, {@code false} if not
      */
-    @AllArgsConstructor
-    public class BukkitChannelDuplexHandler extends ChannelDuplexHandler {
+    public static boolean isAvailable() {
+        return getChannel != null;
+    }
 
-        /** Injected player */
-        private final TabPlayer player;
-
-        @Override
-        public void channelRead(@NotNull ChannelHandlerContext context, @NotNull Object packet) {
-            try {
-                if (TAB.getInstance().getFeatureManager().onPacketReceive(player, packet)) return;
-                super.channelRead(context, packet);
-            } catch (Throwable e) {
-                TAB.getInstance().getErrorManager().printError("An error occurred when reading packets", e);
-            }
-        }
-
-        @Override
-        public void write(ChannelHandlerContext context, Object packet, ChannelPromise channelPromise) {
-            try {
-                if (PacketPlayOutPlayerInfoStorage.CLASS.isInstance(packet) ||
-                   (PacketPlayOutPlayerInfoStorage.ClientboundPlayerInfoRemovePacket != null &&
-                   PacketPlayOutPlayerInfoStorage.ClientboundPlayerInfoRemovePacket.isInstance(packet))) {
-                    super.write(context, TAB.getInstance().getFeatureManager().onPacketPlayOutPlayerInfo(player, packet), channelPromise);
-                    return;
-                }
-                if (antiOverrideTeams && PacketPlayOutScoreboardTeamStorage.CLASS.isInstance(packet)) {
-                    long time = System.nanoTime();
-                    modifyPlayers(packet);
-                    TAB.getInstance().getCPUManager().addTime("NameTags", TabConstants.CpuUsageCategory.ANTI_OVERRIDE, System.nanoTime()-time);
-                    super.write(context, packet, channelPromise);
-                    return;
-                }
-                if (PacketPlayOutScoreboardDisplayObjectiveStorage.CLASS.isInstance(packet)) {
-                    TAB.getInstance().getFeatureManager().onDisplayObjective(player, packet);
-                }
-                if (PacketPlayOutScoreboardObjectiveStorage.CLASS.isInstance(packet)) {
-                    TAB.getInstance().getFeatureManager().onObjective(player, packet);
-                }
-                TAB.getInstance().getFeatureManager().onPacketSend(player, packet);
-            } catch (Throwable e) {
-                TAB.getInstance().getErrorManager().printError("An error occurred when reading packets", e);
-            }
-            try {
-                super.write(context, packet, channelPromise);
-            } catch (Throwable e) {
-                TAB.getInstance().getErrorManager().printError("Failed to forward packet " + packet.getClass().getSimpleName() + " to " + player.getName(), e);
-            }
-        }
-
-        /**
-         * Removes all real players from team if packet does not come from TAB and reports this to override log
-         *
-         * @param   packetPlayOutScoreboardTeam
-         *          team packet
-         * @throws  ReflectiveOperationException
-         *          nmsGameMode
-         */
-        @SuppressWarnings("unchecked")
-        private void modifyPlayers(Object packetPlayOutScoreboardTeam) throws ReflectiveOperationException {
-            int action = PacketPlayOutScoreboardTeamStorage.ACTION.getInt(packetPlayOutScoreboardTeam);
-            if (action == 1 || action == 2 || action == 4) return;
-            Collection<String> players = (Collection<String>) PacketPlayOutScoreboardTeamStorage.PLAYERS.get(packetPlayOutScoreboardTeam);
-            String teamName = (String) PacketPlayOutScoreboardTeamStorage.NAME.get(packetPlayOutScoreboardTeam);
-            if (players == null) return;
-            //creating a new list to prevent NoSuchFieldException in minecraft packet encoder when a player is removed
-            Collection<String> newList = new ArrayList<>();
-            for (String entry : players) {
-                TabPlayer p = getPlayer(entry);
-                if (p == null) {
-                    newList.add(entry);
-                    continue;
-                }
-                Sorting sorting = (Sorting) TAB.getInstance().getFeatureManager().getFeature(TabConstants.Feature.SORTING);
-                if (!((TabFeature)TAB.getInstance().getTeamManager()).isDisabledPlayer(p) &&
-                        !TAB.getInstance().getTeamManager().hasTeamHandlingPaused(p) && !teamName.equals(sorting.getShortTeamName(p))) {
-                    logTeamOverride(teamName, p.getName(), sorting.getShortTeamName(p));
-                } else {
-                    newList.add(entry);
-                }
-            }
-            PacketPlayOutScoreboardTeamStorage.PLAYERS.set(packetPlayOutScoreboardTeam, newList);
-        }
-
-        /**
-         * Returns player with matching game profile name. This is different from
-         * real name when a nick plugin changing names of players is used. If no
-         * player was found, returns {@code null}.
-         *
-         * @param   name
-         *          Game profile name
-         * @return  Player with matching game profile name
-         */
-        private TabPlayer getPlayer(String name) {
-            for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
-                if (p.getNickname().equals(name)) return p;
-            }
-            return null;
-        }
+    @Override
+    @Nullable
+    @SneakyThrows
+    protected Channel getChannel(@NotNull TabPlayer player) {
+        return getChannel.apply(player);
     }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPlaceholderRegistry.java

@@ -1,105 +0,0 @@
-package me.neznamy.tab.platforms.bukkit;
-
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.api.placeholder.PlaceholderManager;
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.placeholders.UniversalPlaceholderRegistry;
-import net.milkbowl.vault.chat.Chat;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.bukkit.plugin.Plugin;
-import org.bukkit.plugin.RegisteredServiceProvider;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.Method;
-import java.util.UUID;
-
-/**
- * Bukkit registry to register bukkit-only and universal placeholders
- */
-public class BukkitPlaceholderRegistry extends UniversalPlaceholderRegistry {
-
-    /** Vault Chat hook */
-    private Chat chat;
-
-    /** NMS server to get TPS from on spigot */
-    private Object server;
-
-    /** TPS field*/
-    private Field recentTps;
-
-    /** Detection for presence of Paper's TPS getter */
-    private Method paperTps;
-
-    /** Detection for presence of Paper's MSPT getter */
-    private Method paperMspt;
-
-    /** Detection for presence of Purpur's AFK getter */
-    private Method purpurIsAfk;
-
-    /**
-     * Constructs new instance and loads hooks
-     */
-    public BukkitPlaceholderRegistry() {
-        if (Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.VAULT)) {
-            RegisteredServiceProvider<Chat> rspChat = Bukkit.getServicesManager().getRegistration(Chat.class);
-            if (rspChat != null) chat = rspChat.getProvider();
-        }
-        try {
-            server = Bukkit.getServer().getClass().getMethod("getServer").invoke(Bukkit.getServer());
-            recentTps = server.getClass().getField("recentTps");
-        } catch (ReflectiveOperationException e) {
-            //not spigot
-        }
-        try { paperTps = Bukkit.class.getMethod("getTPS"); } catch (NoSuchMethodException ignored) {}
-        try { paperMspt = Bukkit.class.getMethod("getAverageTickTime"); } catch (NoSuchMethodException ignored) {}
-        try { purpurIsAfk = Player.class.getMethod("isAfk"); } catch (NoSuchMethodException ignored) {}
-    }
-
-    @SuppressWarnings("deprecation")
-    @Override
-    public void registerPlaceholders(PlaceholderManager manager) {
-        manager.registerPlayerPlaceholder(TabConstants.Placeholder.DISPLAY_NAME, 500, p -> ((Player) p.getPlayer()).getDisplayName());
-        if (paperTps != null) {
-            manager.registerServerPlaceholder(TabConstants.Placeholder.TPS, 1000, () -> formatTPS(Bukkit.getTPS()[0]));
-        } else if (recentTps != null) {
-            manager.registerServerPlaceholder(TabConstants.Placeholder.TPS, 1000, () -> {
-                try {
-                    return formatTPS(((double[]) recentTps.get(server))[0]);
-                } catch (IllegalAccessException e) {
-                    return -1;
-                }
-            });
-        } else {
-            manager.registerServerPlaceholder(TabConstants.Placeholder.TPS, -1, () -> -1);
-        }
-        if (paperMspt != null) {
-            manager.registerServerPlaceholder(TabConstants.Placeholder.MSPT, 1000, () -> format(Bukkit.getAverageTickTime()));
-        }
-        Plugin essentials = Bukkit.getPluginManager().getPlugin(TabConstants.Plugin.ESSENTIALS);
-        manager.registerPlayerPlaceholder(TabConstants.Placeholder.AFK, 500, p -> {
-            if (essentials != null) {
-                try {
-                    Object user = essentials.getClass().getMethod("getUser", UUID.class).invoke(essentials, p.getUniqueId());
-                    if ((boolean) user.getClass().getMethod("isAfk").invoke(user)) return true;
-                } catch (ReflectiveOperationException e) {
-                    TAB.getInstance().getErrorManager().printError("Failed to get AFK status of " + p.getName() + " using Essentials", e);
-                }
-            }
-            return purpurIsAfk != null && ((Player)p.getPlayer()).isAfk();
-        });
-        // Removed placeholder, keeping the implementation to avoid placeholder breaking for users on update
-        manager.registerPlayerPlaceholder(TabConstants.Placeholder.ESSENTIALS_NICK, -1, TabPlayer::getName);
-
-        if (chat != null) {
-            manager.registerPlayerPlaceholder(TabConstants.Placeholder.VAULT_PREFIX, 1000, p -> chat.getPlayerPrefix((Player) p.getPlayer()));
-            manager.registerPlayerPlaceholder(TabConstants.Placeholder.VAULT_SUFFIX, 1000, p -> chat.getPlayerSuffix((Player) p.getPlayer()));
-        } else {
-            manager.registerServerPlaceholder(TabConstants.Placeholder.VAULT_PREFIX, -1, () -> "");
-            manager.registerServerPlaceholder(TabConstants.Placeholder.VAULT_SUFFIX, -1, () -> "");
-        }
-        manager.registerPlayerPlaceholder(TabConstants.Placeholder.HEALTH, 100, p -> (int) Math.ceil(((Player) p.getPlayer()).getHealth()));
-        super.registerPlaceholders(manager);
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitPlatform.java

@@ -1,236 +0,0 @@
-package me.neznamy.tab.platforms.bukkit;
-
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-import lombok.Setter;
-import me.clip.placeholderapi.PlaceholderAPI;
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.api.chat.EnumChatFormat;
-import me.neznamy.tab.api.chat.rgb.RGBUtils;
-import me.neznamy.tab.api.util.ReflectionUtils;
-import me.neznamy.tab.platforms.bukkit.features.BukkitTabExpansion;
-import me.neznamy.tab.platforms.bukkit.features.PerWorldPlayerList;
-import me.neznamy.tab.platforms.bukkit.features.PetFix;
-import me.neznamy.tab.platforms.bukkit.features.WitherBossBar;
-import me.neznamy.tab.platforms.bukkit.features.unlimitedtags.BukkitNameTagX;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-import me.neznamy.tab.platforms.bukkit.permission.Vault;
-import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.backend.BackendPlatform;
-import me.neznamy.tab.shared.features.PlaceholderManagerImpl;
-import me.neznamy.tab.shared.placeholders.expansion.EmptyTabExpansion;
-import me.neznamy.tab.shared.placeholders.expansion.TabExpansion;
-import me.neznamy.tab.shared.features.bossbar.BossBarManagerImpl;
-import me.neznamy.tab.shared.features.nametags.NameTag;
-import me.neznamy.tab.shared.permission.LuckPerms;
-import me.neznamy.tab.shared.permission.None;
-import me.neznamy.tab.shared.permission.PermissionPlugin;
-import me.neznamy.tab.shared.placeholders.PlayerPlaceholderImpl;
-import net.milkbowl.vault.permission.Permission;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import org.bukkit.plugin.Plugin;
-import org.bukkit.plugin.RegisteredServiceProvider;
-import org.bukkit.plugin.java.JavaPlugin;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.Collection;
-
-/**
- * Implementation of Platform interface for Bukkit platform
- */
-@RequiredArgsConstructor
-public class BukkitPlatform extends BackendPlatform {
-
-    @Getter private final BukkitPacketBuilder packetBuilder = new BukkitPacketBuilder();
-    @Getter private final BukkitPipelineInjector pipelineInjector = NMSStorage.getInstance().getMinorVersion() >= 8 ? new BukkitPipelineInjector() : null;
-
-    /** Plugin instance for registering tasks and events */
-    private final JavaPlugin plugin;
-
-    /** Variables checking presence of other plugins to hook into */
-    private final boolean placeholderAPI = Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.PLACEHOLDER_API);
-    @Getter @Setter private boolean libsDisguisesEnabled = Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.LIBS_DISGUISES);
-    private final boolean viaVersion = ReflectionUtils.classExists("com.viaversion.viaversion.api.Via");
-    private final boolean protocolSupport = Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.PROTOCOL_SUPPORT);
-
-    @Override
-    public PermissionPlugin detectPermissionPlugin() {
-        if (Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.LUCKPERMS)) {
-            return new LuckPerms(getPluginVersion(TabConstants.Plugin.LUCKPERMS));
-        } else if (Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.VAULT)) {
-            RegisteredServiceProvider<Permission> provider = Bukkit.getServicesManager().getRegistration(Permission.class);
-            if (provider == null) return new None();
-            return new Vault(provider.getProvider(), getPluginVersion(TabConstants.Plugin.VAULT));
-        } else {
-            return new None();
-        }
-    }
-
-    public BossBarManagerImpl getLegacyBossBar() {
-        return new WitherBossBar(plugin);
-    }
-
-    @Override
-    public String getPluginVersion(String plugin) {
-        Plugin pl = Bukkit.getPluginManager().getPlugin(plugin);
-        return pl == null ? null : pl.getDescription().getVersion();
-    }
-
-    @Override
-    public void loadPlayers() {
-        for (Player p : getOnlinePlayers()) {
-            TAB.getInstance().addPlayer(new BukkitTabPlayer(p, getProtocolVersion(p)));
-        }
-    }
-
-    @Override
-    public void registerPlaceholders() {
-        new BukkitPlaceholderRegistry().registerPlaceholders(TAB.getInstance().getPlaceholderManager());
-    }
-
-    @Override
-    public NameTag getUnlimitedNametags() {
-        return new BukkitNameTagX(plugin);
-    }
-
-    @Override
-    public @NotNull TabExpansion getTabExpansion() {
-        if (placeholderAPI) {
-            BukkitTabExpansion expansion = new BukkitTabExpansion();
-            expansion.register();
-            return expansion;
-        }
-        return new EmptyTabExpansion();
-    }
-
-    @Override
-    public TabFeature getPetFix() {
-        return new PetFix();
-    }
-
-    @Override
-    public @Nullable TabFeature getPerWorldPlayerlist() {
-        return new PerWorldPlayerList(plugin);
-    }
-
-    /**
-     * Returns online players from Bukkit API
-     *
-     * @return  online players from Bukkit API
-     */
-    @SuppressWarnings("unchecked")
-    private Player[] getOnlinePlayers() {
-        try {
-            Object players = Bukkit.class.getMethod("getOnlinePlayers").invoke(null);
-            if (players instanceof Player[]) {
-                //1.7-
-                return (Player[]) players;
-            } else {
-                //1.8+
-                return ((Collection<Player>)players).toArray(new Player[0]); 
-            }
-        } catch (ReflectiveOperationException e) {
-            TAB.getInstance().getErrorManager().printError("Failed to get online players", e);
-            return new Player[0];
-        }
-    }
-
-    @Override
-    public void registerUnknownPlaceholder(String identifier) {
-        PlaceholderManagerImpl pl = TAB.getInstance().getPlaceholderManager();
-        if (identifier.startsWith("%rel_")) {
-            //relational placeholder
-            TAB.getInstance().getPlaceholderManager().registerRelationalPlaceholder(identifier, pl.getRelationalRefresh(identifier), (viewer, target) -> 
-                placeholderAPI ? PlaceholderAPI.setRelationalPlaceholders((Player) viewer.getPlayer(), (Player) target.getPlayer(), identifier) : identifier);
-        } else {
-            //normal placeholder
-            if (identifier.startsWith("%sync:")) {
-                int refresh = pl.getServerPlaceholderRefreshIntervals().getOrDefault(identifier,
-                        pl.getPlayerPlaceholderRefreshIntervals().getOrDefault(identifier, pl.getDefaultRefresh()));
-                String syncedPlaceholder = "%" + identifier.substring(6, identifier.length()-1) + "%";
-                pl.registerPlaceholder(new PlayerPlaceholderImpl(identifier, refresh, null) {
-                    
-                    @Override
-                    public Object request(TabPlayer p) {
-                        Bukkit.getScheduler().runTask(plugin, () -> {
-                            long time = System.nanoTime();
-                            updateValue(p, placeholderAPI ? PlaceholderAPI.setPlaceholders((Player) p.getPlayer(), syncedPlaceholder) : identifier);
-                            TAB.getInstance().getCPUManager().addPlaceholderTime(getIdentifier(), System.nanoTime()-time);
-                        });
-                        return null;
-                    }
-                });
-                return;
-            }
-            if (pl.getServerPlaceholderRefreshIntervals().containsKey(identifier)) {
-                TAB.getInstance().getPlaceholderManager().registerServerPlaceholder(identifier, pl.getServerPlaceholderRefreshIntervals().get(identifier), () ->
-                        placeholderAPI ? PlaceholderAPI.setPlaceholders(null, identifier) : identifier);
-            } else {
-                int refresh = pl.getPlayerPlaceholderRefreshIntervals().getOrDefault(identifier, pl.getDefaultRefresh());
-                TAB.getInstance().getPlaceholderManager().registerPlayerPlaceholder(identifier, refresh, p -> 
-                    placeholderAPI ? PlaceholderAPI.setPlaceholders((Player) p.getPlayer(), identifier) : identifier);
-            }
-        }
-    }
-
-    /**
-     * Gets protocol version of requested player and returns it.
-     *
-     * @param   player
-     *          Player to get protocol version of
-     * @return  protocol version of the player
-     */
-    public int getProtocolVersion(Player player) {
-        if (protocolSupport) {
-            int version = getProtocolVersionPS(player);
-            //some PS versions return -1 on unsupported server versions instead of throwing exception
-            if (version != -1 && version < TAB.getInstance().getServerVersion().getNetworkId()) return version;
-        }
-        if (viaVersion) {
-            return ProtocolVersion.getPlayerVersionVia(player.getUniqueId(), player.getName());
-        }
-        return TAB.getInstance().getServerVersion().getNetworkId();
-    }
-
-    /**
-     * Returns protocol version of requested player using ProtocolSupport
-     *
-     * @param   player
-     *          Player to get protocol version of
-     * @return  protocol version of the player using ProtocolSupport
-     */
-    private int getProtocolVersionPS(Player player) {
-        try {
-            Object protocolVersion = Class.forName("protocolsupport.api.ProtocolSupportAPI").getMethod("getProtocolVersion", Player.class).invoke(null, player);
-            int version = (int) protocolVersion.getClass().getMethod("getId").invoke(protocolVersion);
-            TAB.getInstance().debug("ProtocolSupport returned protocol version " + version + " for " + player.getName() + " (online=" + player.isOnline() + ")");
-            return version;
-        } catch (ReflectiveOperationException e) {
-            TAB.getInstance().getErrorManager().printError(String.format("Failed to get protocol version of %s using ProtocolSupport", player.getName()), e);
-            return TAB.getInstance().getServerVersion().getNetworkId();
-        }
-    }
-
-    /**
-     * Sends console message using ConsoleCommandSender, due to
-     * Paper not translating colors correctly in Logger messages
-     * and to allow RGB (at least on Paper, doesn't work on spigot)
-     *
-     * @param   message
-     *          Message to send
-     * @param   translateColors
-     *          Whether color codes should be translated or not
-     */
-    @Override
-    public void sendConsoleMessage(String message, boolean translateColors) {
-        Bukkit.getConsoleSender().sendMessage("[TAB] " + (translateColors ?
-                EnumChatFormat.color(RGBUtils.getInstance().convertToBukkitFormat(message,
-                        TAB.getInstance().getServerVersion().getMinorVersion() >= 16))
-                : message));
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitTAB.java

@@ -1,143 +1,24 @@
 package me.neznamy.tab.platforms.bukkit;
 
-import me.neznamy.tab.api.ProtocolVersion;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.api.chat.EnumChatFormat;
-import me.neznamy.tab.api.util.SupplierWithException;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.*;
+import me.neznamy.tab.platforms.bukkit.platform.BukkitPlatform;
+import me.neznamy.tab.platforms.bukkit.platform.FoliaPlatform;
 import me.neznamy.tab.shared.TAB;
-import org.bstats.bukkit.Metrics;
-import org.bstats.charts.SimplePie;
-import org.bukkit.Bukkit;
-import org.bukkit.command.*;
-import org.bukkit.entity.Player;
+import me.neznamy.tab.shared.util.ReflectionUtils;
 import org.bukkit.plugin.java.JavaPlugin;
-import org.jetbrains.annotations.NotNull;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
 
 /**
- * Main class for Bukkit platform
+ * Main class for Bukkit.
  */
 public class BukkitTAB extends JavaPlugin {
 
     @Override
     public void onEnable() {
-        String version = Bukkit.getBukkitVersion().split("-")[0];
-        String serverPackage = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
-        Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("[TAB] Server version: " + version + " (" + serverPackage + ")"));
-        if (!isVersionSupported()) {
-            Bukkit.getPluginManager().disablePlugin(this);
-            return;
-        }
-        BukkitPlatform platform = new BukkitPlatform(this);
-        TAB.setInstance(new TAB(platform, ProtocolVersion.fromFriendlyName(version), version + " (" + serverPackage + ")", getDataFolder(), getLogger()));
-        if (TAB.getInstance().getServerVersion() == ProtocolVersion.UNKNOWN_SERVER_VERSION) {
-            Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Unknown server version: " + Bukkit.getBukkitVersion() + "! Plugin may not work correctly."));
-        }
-        Bukkit.getPluginManager().registerEvents(new BukkitEventListener(platform), this);
-        TAB.getInstance().load();
-        Metrics metrics = new Metrics(this, 5304);
-        metrics.addCustomChart(new SimplePie(TabConstants.MetricsChart.UNLIMITED_NAME_TAG_MODE_ENABLED, () -> TAB.getInstance().getFeatureManager().isFeatureEnabled(TabConstants.Feature.UNLIMITED_NAME_TAGS) ? "Yes" : "No"));
-        metrics.addCustomChart(new SimplePie(TabConstants.MetricsChart.PLACEHOLDER_API, () -> Bukkit.getPluginManager().isPluginEnabled(TabConstants.Plugin.PLACEHOLDER_API) ? "Yes" : "No"));
-        metrics.addCustomChart(new SimplePie(TabConstants.MetricsChart.PERMISSION_SYSTEM, () -> TAB.getInstance().getGroupManager().getPlugin().getName()));
-        metrics.addCustomChart(new SimplePie(TabConstants.MetricsChart.SERVER_VERSION, () -> "1." + TAB.getInstance().getServerVersion().getMinorVersion() + ".x"));
-        PluginCommand cmd = Bukkit.getPluginCommand("tab");
-        if (cmd == null) return;
-        TABCommand command = new TABCommand();
-        cmd.setExecutor(command);
-        cmd.setTabCompleter(command);
+        boolean folia = ReflectionUtils.classExists("io.papermc.paper.threadedregions.RegionizedServer");
+        TAB.create(folia ? new FoliaPlatform(this) : new BukkitPlatform(this));
     }
 
     @Override
     public void onDisable() {
-        //null check due to compatibility check making instance not get set on unsupported versions
-        if (TAB.getInstance() != null) TAB.getInstance().unload();
-    }
-    
-    /**
-     * Initializes all used NMS classes, constructors, fields and methods.
-     * Returns {@code true} if everything went successfully and version is marked as compatible,
-     * {@code false} if anything went wrong or version is not marked as compatible.
-     *
-     * @return  {@code true} if server version is compatible, {@code false} if not
-     */
-    private boolean isVersionSupported() {
-        List<String> supportedVersions = Arrays.asList(
-                "v1_5_R1", "v1_5_R2", "v1_5_R3", "v1_6_R1", "v1_6_R2", "v1_6_R3",
-                "v1_7_R1", "v1_7_R2", "v1_7_R3", "v1_7_R4", "v1_8_R1", "v1_8_R2", "v1_8_R3",
-                "v1_9_R1", "v1_9_R2", "v1_10_R1", "v1_11_R1", "v1_12_R1", "v1_13_R1", "v1_13_R2",
-                "v1_14_R1", "v1_15_R1", "v1_16_R1", "v1_16_R2", "v1_16_R3", "v1_17_R1", "v1_18_R1",
-                "v1_18_R2", "v1_19_R1", "v1_19_R2", "v1_19_R3");
-        String supportedVersionRange = "1.5 - 1.19.4";
-        String serverPackage = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];
-        try {
-            long time = System.currentTimeMillis();
-            NMSStorage.setInstance(getNMSLoader());
-            if (supportedVersions.contains(serverPackage)) {
-                Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("[TAB] Loaded NMS hook in " + (System.currentTimeMillis()-time) + "ms"));
-                return true;
-            } else {
-                Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] No compatibility issue was found, but this plugin version does not claim to support your server package (" + serverPackage + "). This jar has only been tested on " + supportedVersionRange + ". Disabling just to stay safe."));
-            }
-        } catch (IllegalStateException ex) {
-            if (supportedVersions.contains(serverPackage)) {
-                Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Your server version is marked as compatible, but a compatibility issue was found. Please report this issue (include your server version & fork too)"));
-            } else {
-                Bukkit.getConsoleSender().sendMessage(EnumChatFormat.color("&c[TAB] Your server version is completely unsupported. This plugin version only supports " + supportedVersionRange + ". Disabling."));
-            }
-        }
-        return false;
-    }
-
-    private NMSStorage getNMSLoader() {
-        List<SupplierWithException<NMSStorage>> loaders = new ArrayList<>();
-        loaders.add(BukkitLegacyNMSStorage::new);
-        loaders.add(BukkitModernNMSStorage::new);
-        loaders.add(MojangModernNMSStorage::new);
-        loaders.add(ThermosNMSStorage::new);
-        for (SupplierWithException<NMSStorage> loader : loaders) {
-            try {
-                return loader.get();
-            } catch (Exception ignored) {}
-        }
-        throw new IllegalStateException("Unsupported server version");
-    }
-
-    /**
-     * Command handler for /tab command
-     */
-    private static class TABCommand implements CommandExecutor, TabCompleter {
-
-        @Override
-        public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, String[] args) {
-            if (TabAPI.getInstance().isPluginDisabled()) {
-                for (String message : TAB.getInstance().getDisabledCommand().execute(args, sender.hasPermission(TabConstants.Permission.COMMAND_RELOAD), sender.hasPermission(TabConstants.Permission.COMMAND_ALL))) {
-                    sender.sendMessage(EnumChatFormat.color(message));
-                }
-            } else {
-                TabPlayer p = null;
-                if (sender instanceof Player) {
-                    p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
-                    if (p == null) return true; //player not loaded correctly
-                }
-                TAB.getInstance().getCommand().execute(p, args);
-            }
-            return false;
-        }
-
-        @Override
-        public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, String[] args) {
-            TabPlayer p = null;
-            if (sender instanceof Player) {
-                p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
-                if (p == null) return new ArrayList<>(); //player not loaded correctly
-            }
-            return TAB.getInstance().getCommand().complete(p, args);
-        }
+        TAB.getInstance().unload();
     }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitTabCommand.java

@@ -0,0 +1,49 @@
+package me.neznamy.tab.platforms.bukkit;
+
+import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.TabConstants;
+import me.neznamy.tab.shared.chat.EnumChatFormat;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Command handler for /tab command
+ */
+public class BukkitTabCommand implements CommandExecutor, TabCompleter {
+
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        if (TAB.getInstance().isPluginDisabled()) {
+            for (String message : TAB.getInstance().getDisabledCommand().execute(args, sender.hasPermission(TabConstants.Permission.COMMAND_RELOAD), sender.hasPermission(TabConstants.Permission.COMMAND_ALL))) {
+                sender.sendMessage(EnumChatFormat.color(message));
+            }
+        } else {
+            TabPlayer p = null;
+            if (sender instanceof Player) {
+                p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
+                if (p == null) return true; //player not loaded correctly
+            }
+            TAB.getInstance().getCommand().execute(p, args);
+        }
+        return false;
+    }
+
+    @Override
+    @NotNull
+    public List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command, @NotNull String alias, @NotNull String[] args) {
+        TabPlayer p = null;
+        if (sender instanceof Player) {
+            p = TAB.getInstance().getPlayer(((Player)sender).getUniqueId());
+            if (p == null) return Collections.emptyList(); //player not loaded correctly
+        }
+        return TAB.getInstance().getCommand().complete(p, args);
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitTabPlayer.java

@@ -1,236 +1,70 @@
 package me.neznamy.tab.platforms.bukkit;
 
-import com.mojang.authlib.GameProfile;
-import com.mojang.authlib.properties.Property;
-import com.viaversion.viaversion.api.Via;
-import com.viaversion.viaversion.api.legacy.bossbar.BossColor;
-import com.viaversion.viaversion.api.legacy.bossbar.BossFlag;
-import com.viaversion.viaversion.api.legacy.bossbar.BossStyle;
 import lombok.Getter;
-import lombok.NonNull;
-import me.neznamy.tab.api.chat.rgb.RGBUtils;
-import me.neznamy.tab.api.protocol.PacketPlayOutBoss;
-import me.neznamy.tab.api.protocol.PacketPlayOutChat;
-import me.neznamy.tab.api.protocol.Skin;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-import me.neznamy.tab.shared.ITabPlayer;
-import me.neznamy.tab.shared.TAB;
-import org.bukkit.Bukkit;
-import org.bukkit.boss.BarColor;
-import org.bukkit.boss.BarFlag;
-import org.bukkit.boss.BarStyle;
-import org.bukkit.boss.BossBar;
-import org.bukkit.entity.Entity;
+import me.neznamy.tab.platforms.bukkit.bossbar.BossBarLoader;
+import me.neznamy.tab.platforms.bukkit.hook.LibsDisguisesHook;
+import me.neznamy.tab.platforms.bukkit.entity.PacketEntityView;
+import me.neznamy.tab.platforms.bukkit.nms.PingRetriever;
+import me.neznamy.tab.platforms.bukkit.platform.BukkitPlatform;
+import me.neznamy.tab.platforms.bukkit.scoreboard.ScoreboardLoader;
+import me.neznamy.tab.platforms.bukkit.tablist.TabListBase;
+import me.neznamy.tab.shared.backend.entityview.DummyEntityView;
+import me.neznamy.tab.shared.backend.entityview.EntityView;
+import me.neznamy.tab.shared.platform.BossBar;
+import me.neznamy.tab.shared.chat.TabComponent;
+import me.neznamy.tab.shared.platform.TabList;
+import me.neznamy.tab.shared.platform.Scoreboard;
+import me.neznamy.tab.shared.backend.BackendTabPlayer;
 import org.bukkit.entity.Player;
 import org.bukkit.metadata.MetadataValue;
 import org.bukkit.potion.PotionEffectType;
-
-import java.util.Collection;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.UUID;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * TabPlayer implementation for Bukkit platform
  */
-public class BukkitTabPlayer extends ITabPlayer {
+@SuppressWarnings("deprecation")
+@Getter
+public class BukkitTabPlayer extends BackendTabPlayer {
 
-    /** Player's NMS handle (EntityPlayer), preloading for speed */
-    private Object handle;
+    @NotNull
+    private final Scoreboard<BukkitTabPlayer, ?> scoreboard = ScoreboardLoader.getInstance().apply(this);
 
-    /** Player's connection for sending packets, preloading for speed */
-    @Getter private Object playerConnection;
-    
-    /** Bukkit BossBars the player can currently see */
-    private final Map<UUID, BossBar> bossBars = new HashMap<>();
+    @NotNull
+    private final TabListBase<?> tabList = TabListBase.getInstance().apply(this);
 
-    /** ViaVersion BossBars this 1.9+ player can see on 1.8 server */
-    private final Map<UUID, com.viaversion.viaversion.api.legacy.bossbar.BossBar> viaBossBars = new HashMap<>();
+    @NotNull
+    private final BossBar bossBar = BossBarLoader.findInstance(this);
+
+    @NotNull
+    private final EntityView entityView = PacketEntityView.isAvailable() ? new PacketEntityView(this) : new DummyEntityView();
 
     /**
-     * Constructs new instance with given bukkit player and protocol version
+     * Constructs new instance with given bukkit player
      *
+     * @param   platform
+     *          Server platform
      * @param   p
      *          bukkit player
-     * @param   protocolVersion
-     *          Player's protocol network id
      */
-    public BukkitTabPlayer(Player p, int protocolVersion) {
-        super(p, p.getUniqueId(), p.getName(), TAB.getInstance().getConfiguration().getServerName(), p.getWorld().getName(), protocolVersion, true);
-        try {
-            handle = NMSStorage.getInstance().getHandle.invoke(player);
-            playerConnection = NMSStorage.getInstance().PLAYER_CONNECTION.get(handle);
-        } catch (ReflectiveOperationException e) {
-            TAB.getInstance().getErrorManager().printError("Failed to get playerConnection of " + p.getName(), e);
-        }
+    public BukkitTabPlayer(@NotNull BukkitPlatform platform, @NotNull Player p) {
+        super(platform, p, p.getUniqueId(), p.getName(), p.getWorld().getName(), platform.getServerVersion().getNetworkId());
     }
 
     @Override
-    public boolean hasPermission(@NonNull String permission) {
-        long time = System.nanoTime();
-        boolean value = getPlayer().hasPermission(permission);
-        TAB.getInstance().getCPUManager().addMethodTime("hasPermission", System.nanoTime()-time);
-        return value;
+    public boolean hasPermission(@NotNull String permission) {
+        return getPlayer().hasPermission(permission);
     }
 
     @Override
     public int getPing() {
-        try {
-            int ping = NMSStorage.getInstance().PING.getInt(handle);
-            if (ping > 10000 || ping < 0) ping = -1;
-            return ping;
-        } catch (IllegalAccessException e) {
-            return -1;
-        }
+        return PingRetriever.getPing(getPlayer());
     }
 
     @Override
-    public void sendPacket(Object nmsPacket) {
-        if (nmsPacket == null || !getPlayer().isOnline()) return;
-        long time = System.nanoTime();
-        try {
-            if (nmsPacket instanceof PacketPlayOutBoss) {
-                if (TAB.getInstance().getServerVersion().getMinorVersion() >= 9) {
-                    handle((PacketPlayOutBoss) nmsPacket);
-                } else {
-                    handleVia((PacketPlayOutBoss) nmsPacket);
-                }
-            } else if (nmsPacket instanceof PacketPlayOutChat) {
-                getPlayer().sendMessage(((PacketPlayOutChat) nmsPacket).getMessage().toLegacyText());
-            } else {
-                NMSStorage.getInstance().sendPacket.invoke(playerConnection, nmsPacket);
-            }
-        } catch (ReflectiveOperationException e) {
-            TAB.getInstance().getErrorManager().printError("An error occurred when sending " + nmsPacket.getClass().getSimpleName(), e);
-        }
-        TAB.getInstance().getCPUManager().addMethodTime("sendPacket", System.nanoTime()-time);
-    }
-
-    /**
-     * Handles PacketPlayOutBoss packet send request using Bukkit API,
-     * since the API offers everything we need and makes us not need to
-     * deal with NMS code at all.
-     *
-     * @param   packet
-     *          packet request to handle using Bukkit API
-     */
-    private void handle(PacketPlayOutBoss packet) {
-        BossBar bar = bossBars.get(packet.getId());
-        if (packet.getAction() == PacketPlayOutBoss.Action.ADD) {
-            if (bossBars.containsKey(packet.getId())) return;
-            bar = Bukkit.createBossBar(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16 && TAB.getInstance().getServerVersion().getMinorVersion() >= 16),
-                    BarColor.valueOf(packet.getColor().name()),
-                    BarStyle.valueOf(packet.getOverlay().getBukkitName()));
-            if (packet.isCreateWorldFog()) bar.addFlag(BarFlag.CREATE_FOG);
-            if (packet.isDarkenScreen()) bar.addFlag(BarFlag.DARKEN_SKY);
-            if (packet.isPlayMusic()) bar.addFlag(BarFlag.PLAY_BOSS_MUSIC);
-            bar.setProgress(packet.getPct());
-            bossBars.put(packet.getId(), bar);
-            bar.addPlayer(getPlayer());
-            return;
-        }
-        if (bar == null) return; //no idea how
-        switch (packet.getAction()) {
-        case REMOVE:
-            bar.removePlayer(getPlayer());
-            bossBars.remove(packet.getId());
-            break;
-        case UPDATE_PCT:
-            bar.setProgress(packet.getPct());
-            break;
-        case UPDATE_NAME:
-            bar.setTitle(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16 && TAB.getInstance().getServerVersion().getMinorVersion() >= 16));
-            break;
-        case UPDATE_STYLE:
-            bar.setColor(BarColor.valueOf(packet.getColor().name()));
-            bar.setStyle(BarStyle.valueOf(packet.getOverlay().getBukkitName()));
-            break;
-        case UPDATE_PROPERTIES:
-            bar = bossBars.get(packet.getId());
-            processFlag(bar, packet.isCreateWorldFog(), BarFlag.CREATE_FOG);
-            processFlag(bar, packet.isDarkenScreen(), BarFlag.DARKEN_SKY);
-            processFlag(bar, packet.isPlayMusic(), BarFlag.PLAY_BOSS_MUSIC);
-            break;
-        default:
-            break;
-        }
-    }
-
-    /**
-     * Handles PacketPlayOutBoss packet request for 1.9+ clients on
-     * 1.8 servers using ViaVersion API instead of using Wither.
-     *
-     * @param   packet
-     *          packet request to handle using ViaVersion API
-     */
-    private void handleVia(PacketPlayOutBoss packet) {
-        com.viaversion.viaversion.api.legacy.bossbar.BossBar bar;
-        switch (packet.getAction()) {
-        case ADD:
-            if (viaBossBars.containsKey(packet.getId())) return;
-            bar = Via.getAPI().legacyAPI().createLegacyBossBar(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16), 
-                    packet.getPct(),
-                    BossColor.valueOf(packet.getColor().name()), 
-                    BossStyle.valueOf(packet.getOverlay().getBukkitName()));
-            //fog missing from via API
-            if (packet.isDarkenScreen()) bar.addFlag(BossFlag.DARKEN_SKY);
-            if (packet.isPlayMusic()) bar.addFlag(BossFlag.PLAY_BOSS_MUSIC);
-            viaBossBars.put(packet.getId(), bar);
-            bar.addPlayer(getPlayer().getUniqueId());
-            break;
-        case REMOVE:
-            viaBossBars.get(packet.getId()).removePlayer(getPlayer().getUniqueId());
-            viaBossBars.remove(packet.getId());
-            break;
-        case UPDATE_PCT:
-            viaBossBars.get(packet.getId()).setHealth(packet.getPct());
-            break;
-        case UPDATE_NAME:
-            viaBossBars.get(packet.getId()).setTitle(RGBUtils.getInstance().convertToBukkitFormat(packet.getName(), getVersion().getMinorVersion() >= 16));
-            break;
-        case UPDATE_STYLE:
-            viaBossBars.get(packet.getId()).setColor(BossColor.valueOf(packet.getColor().name()));
-            viaBossBars.get(packet.getId()).setStyle(BossStyle.valueOf(packet.getOverlay().getBukkitName()));
-            break;
-        case UPDATE_PROPERTIES:
-            bar = viaBossBars.get(packet.getId());
-            //fog missing from via API
-            processFlagVia(bar, packet.isDarkenScreen(), BossFlag.DARKEN_SKY);
-            processFlagVia(bar, packet.isPlayMusic(), BossFlag.PLAY_BOSS_MUSIC);
-            break;
-        default:
-            break;
-        }
-    }
-
-    /**
-     * Sets BossBar flag to requested target value.
-     *
-     * @param   bar
-     *          BossBar to set flag of
-     * @param   targetValue
-     *          Target value of the flag
-     * @param   flag
-     *          Flag to set value of
-     */
-    private void processFlag(BossBar bar, boolean targetValue, BarFlag flag) {
-        if (targetValue && !bar.hasFlag(flag)) bar.addFlag(flag);
-        if (!targetValue && bar.hasFlag(flag)) bar.removeFlag(flag);
-    }
-
-    /**
-     * Sets BossBar flag to requested target value.
-     *
-     * @param   bar
-     *          BossBar to set flag of
-     * @param   targetValue
-     *          Target value of the flag
-     * @param   flag
-     *          Flag to set value of
-     */
-    private void processFlagVia(com.viaversion.viaversion.api.legacy.bossbar.BossBar bar, boolean targetValue, BossFlag flag) {
-        if (targetValue && !bar.hasFlag(flag)) bar.addFlag(flag);
-        if (!targetValue && bar.hasFlag(flag)) bar.removeFlag(flag);
+    public void sendMessage(@NotNull TabComponent message) {
+        getPlayer().sendMessage(getPlatform().toBukkitFormat(message, getVersion().supportsRGB()));
     }
 
     @Override
@@ -240,48 +74,47 @@ public class BukkitTabPlayer extends ITabPlayer {
 
     @Override
     public boolean isDisguised() {
-        try {
-            if (!((BukkitPlatform)TAB.getInstance().getPlatform()).isLibsDisguisesEnabled()) return false;
-            return (boolean) Class.forName("me.libraryaddict.disguise.DisguiseAPI").getMethod("isDisguised", Entity.class).invoke(null, getPlayer());
-        } catch (LinkageError | ReflectiveOperationException e) {
-            //java.lang.NoClassDefFoundError: Could not initialize class me.libraryaddict.disguise.DisguiseAPI
-            TAB.getInstance().getErrorManager().printError("Failed to check disguise status using LibsDisguises", e);
-            ((BukkitPlatform)TAB.getInstance().getPlatform()).setLibsDisguisesEnabled(false);
-            return false;
-        }
+        return LibsDisguisesHook.isDisguised(this);
     }
 
     @Override
-    public Skin getSkin() {
-        try {
-            Collection<Property> col = ((GameProfile)NMSStorage.getInstance().getProfile.invoke(handle)).getProperties().get("textures");
-            if (col.isEmpty()) return null; //offline mode
-            Property property = col.iterator().next();
-            return new Skin(property.getValue(), property.getSignature());
-        } catch (ReflectiveOperationException e) {
-            TAB.getInstance().getErrorManager().printError("Failed to get skin of " + getName(), e);
-            return null;
-        }
+    @Nullable
+    public TabList.Skin getSkin() {
+        return tabList.getSkin();
     }
 
     @Override
+    @NotNull
     public Player getPlayer() {
         return (Player) player;
     }
 
     @Override
-    public boolean isOnline() {
-        return getPlayer().isOnline();
+    public BukkitPlatform getPlatform() {
+        return (BukkitPlatform) platform;
     }
 
     @Override
     public boolean isVanished() {
-        return getPlayer().getMetadata("vanished").stream().anyMatch(MetadataValue::asBoolean);
+        for (MetadataValue v : getPlayer().getMetadata("vanished")) {
+            if (v.asBoolean()) return true;
+        }
+        return false;
     }
 
-    @SuppressWarnings("deprecation")
     @Override
     public int getGamemode() {
         return getPlayer().getGameMode().getValue();
     }
+
+    @Override
+    public double getHealth() {
+        return getPlayer().getHealth();
+    }
+
+    @Override
+    @NotNull
+    public String getDisplayName() {
+        return getPlayer().getDisplayName();
+    }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/BukkitUtils.java

@@ -0,0 +1,88 @@
+package me.neznamy.tab.platforms.bukkit;
+
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import lombok.SneakyThrows;
+import me.neznamy.tab.shared.ProtocolVersion;
+import me.neznamy.tab.shared.chat.EnumChatFormat;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collection;
+
+/**
+ * Class containing static util methods used on Bukkit.
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public class BukkitUtils {
+
+    /** Whether compatibility exceptions should be printed or not, enabling when adding support for new versions */
+    public static final boolean PRINT_EXCEPTIONS = false;
+
+    private static boolean compatibilityIssue;
+
+    /**
+     * Returns online players from Bukkit API. This requires reflection, as return type changed in 1.8,
+     * and we want to avoid errors.
+     *
+     * @return  Online players from Bukkit API.
+     */
+    @SuppressWarnings("unchecked")
+    @SneakyThrows
+    @NotNull
+    public static Player[] getOnlinePlayers() {
+        Object players = Bukkit.class.getMethod("getOnlinePlayers").invoke(null);
+        if (players instanceof Player[]) {
+            //1.7-
+            return (Player[]) players;
+        } else {
+            //1.8+
+            return ((Collection<Player>)players).toArray(new Player[0]);
+        }
+    }
+
+    /**
+     * Prints a console warn that some compatibility issue was found.
+     *
+     * @param   exception
+     *          Exception thrown when initializing fields, if applicable
+     * @param   failedCheck
+     *          Check that failed
+     * @param   fallback
+     *          Fallback implementation, if available
+     * @param   missingFeatures
+     *          Features that will be broken because of the incompatibility
+     */
+    public static void compatibilityError(@NotNull Exception exception, @NotNull String failedCheck,
+                                          @Nullable String fallback, @NotNull String... missingFeatures) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(EnumChatFormat.RED);
+        sb.append("[TAB] Failed to initialize minecraft fields for ");
+        sb.append(failedCheck);
+        sb.append(" due to a compatibility error. ");
+        if (fallback != null) {
+            sb.append("Using fallback solution using ").append(fallback).append(". ");
+        } else {
+            sb.append("No fallback solution was found. ");
+        }
+        if (missingFeatures.length > 0) sb.append("This will result in: ");
+        for (int i=0; i<missingFeatures.length; i++) {
+            sb.append("\n").append("#").append(i + 1).append(": ").append(missingFeatures[i]);
+        }
+        Bukkit.getConsoleSender().sendMessage(sb.toString());
+        if (PRINT_EXCEPTIONS) exception.printStackTrace();
+        compatibilityIssue = true;
+    }
+
+    /**
+     * Sends a message asking user to update the plugin if some compatibility issue was found.
+     */
+    public static void sendCompatibilityMessage() {
+        if (!compatibilityIssue) return;
+        Bukkit.getConsoleSender().sendMessage(EnumChatFormat.RED + "[TAB] Please update the plugin to " +
+                "a version with native support for your server version for optimal experience. This plugin version " +
+                "was made for " + ProtocolVersion.V1_5.getFriendlyName() + " - " + ProtocolVersion.LATEST_KNOWN_VERSION.getFriendlyName() + ".");
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/bossbar/BossBarLoader.java

@@ -0,0 +1,31 @@
+package me.neznamy.tab.platforms.bukkit.bossbar;
+
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.platforms.bukkit.nms.BukkitReflection;
+import me.neznamy.tab.shared.platform.BossBar;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Class for finding BossBar implementation based on server and client version.
+ */
+public class BossBarLoader {
+
+    /**
+     * Finds best available instance for given player.
+     *
+     * @param   player
+     *          Player to find instance for
+     * @return  BossBar instance for player
+     */
+    @NotNull
+    public static BossBar findInstance(@NotNull BukkitTabPlayer player) {
+        // 1.9+ server, handle using API, potential 1.8 players are handled by ViaVersion
+        if (BukkitReflection.getMinorVersion() >= 9) return new BukkitBossBar(player);
+
+        // 1.9+ player on 1.8 server, handle using ViaVersion API
+        if (player.getVersion().getMinorVersion() >= 9) return new ViaBossBar(player);
+
+        // 1.8- server and player, use wither
+        return new EntityBossBar(player);
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/bossbar/BukkitBossBar.java

@@ -0,0 +1,71 @@
+package me.neznamy.tab.platforms.bukkit.bossbar;
+
+import lombok.RequiredArgsConstructor;
+import me.neznamy.tab.api.bossbar.BarColor;
+import me.neznamy.tab.api.bossbar.BarStyle;
+import me.neznamy.tab.shared.chat.TabComponent;
+import me.neznamy.tab.shared.platform.BossBar;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import org.bukkit.Bukkit;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * BossBar for 1.9+ servers where Bukkit API is used. If ViaVersion is used
+ * to allow 1.8 players, it will handle the entity and teleporting by itself.
+ */
+@RequiredArgsConstructor
+public class BukkitBossBar implements BossBar {
+
+    /** Style array for fast access */
+    private static final org.bukkit.boss.BarStyle[] styles = org.bukkit.boss.BarStyle.values();
+    
+    /** Player this handler belongs to */
+    @NotNull
+    private final BukkitTabPlayer player;
+
+    /** Bukkit BossBars the player can currently see */
+    @NotNull
+    private final Map<UUID, org.bukkit.boss.BossBar> bossBars = new HashMap<>();
+
+    @Override
+    public void create(@NotNull UUID id, @NotNull String title, float progress, @NotNull BarColor color, @NotNull BarStyle style) {
+        if (bossBars.containsKey(id)) return;
+        org.bukkit.boss.BossBar bar = Bukkit.createBossBar(
+                player.getPlatform().toBukkitFormat(TabComponent.optimized(title), player.getVersion().supportsRGB()),
+                org.bukkit.boss.BarColor.valueOf(color.name()),
+                styles[style.ordinal()]
+        );
+        bar.setProgress(progress);
+        bar.addPlayer(player.getPlayer());
+        bossBars.put(id, bar);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull String title) {
+        bossBars.get(id).setTitle(player.getPlatform().toBukkitFormat(TabComponent.optimized(title), player.getVersion().supportsRGB()));
+    }
+
+    @Override
+    public void update(@NotNull UUID id, float progress) {
+        bossBars.get(id).setProgress(progress);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarStyle style) {
+        bossBars.get(id).setStyle(styles[style.ordinal()]);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarColor color) {
+        bossBars.get(id).setColor(org.bukkit.boss.BarColor.valueOf(color.name()));
+    }
+
+    @Override
+    public void remove(@NotNull UUID id) {
+        bossBars.remove(id).removePlayer(player.getPlayer());
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/bossbar/EntityBossBar.java

@@ -0,0 +1,74 @@
+package me.neznamy.tab.platforms.bukkit.bossbar;
+
+import lombok.RequiredArgsConstructor;
+import me.neznamy.tab.shared.platform.BossBar;
+import me.neznamy.tab.api.bossbar.BarColor;
+import me.neznamy.tab.api.bossbar.BarStyle;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.platforms.bukkit.entity.DataWatcher;
+import me.neznamy.tab.shared.backend.Location;
+import org.bukkit.entity.EntityType;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+/**
+ * BossBar using wither entity for <1.9 players on <1.9 servers.
+ * Additional logic, such as teleporting the entity must be done
+ * separately, as this class does not handle it.
+ */
+@RequiredArgsConstructor
+public class EntityBossBar implements BossBar {
+
+    /** Max health of wither */
+    private static final int WITHER_MAX_HEALTH = 300;
+
+    /** Ideal value for invulnerable time for minimal wither size */
+    private static final int IDEAL_INVULNERABLE_TIME = 880;
+
+    /** Flag making entity invisible */
+    private static final byte INVISIBLE_FLAG = 1 << 5;
+
+    /** Player this handler belongs to */
+    @NotNull
+    private final BukkitTabPlayer player;
+
+    @Override
+    public void create(@NotNull UUID id, @NotNull String title, float progress, @NotNull BarColor color, @NotNull BarStyle style) {
+        DataWatcher w = new DataWatcher();
+        float health = WITHER_MAX_HEALTH*progress;
+        if (health == 0) health = 1;
+        w.setHealth(health);
+        w.setCustomName(title, player.getVersion());
+        w.setEntityFlags(INVISIBLE_FLAG);
+        w.setWitherInvulnerableTime(IDEAL_INVULNERABLE_TIME);
+        player.getEntityView().spawnEntity(id.hashCode(), new UUID(0, 0), EntityType.WITHER, new Location(0, 0, 0), w);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull String title) {
+        DataWatcher w = new DataWatcher();
+        w.setCustomName(title, player.getVersion());
+        player.getEntityView().updateEntityMetadata(id.hashCode(), w);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, float progress) {
+        DataWatcher w = new DataWatcher();
+        float health = WITHER_MAX_HEALTH*progress;
+        if (health == 0) health = 1;
+        w.setHealth(health);
+        player.getEntityView().updateEntityMetadata(id.hashCode(), w);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarStyle style) {/*Added in 1.9*/}
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarColor color) {/*Added in 1.9*/}
+
+    @Override
+    public void remove(@NotNull UUID id) {
+        player.getEntityView().destroyEntities(id.hashCode());
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/bossbar/ViaBossBar.java

@@ -0,0 +1,72 @@
+package me.neznamy.tab.platforms.bukkit.bossbar;
+
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.legacy.bossbar.BossColor;
+import com.viaversion.viaversion.api.legacy.bossbar.BossStyle;
+import lombok.RequiredArgsConstructor;
+import me.neznamy.tab.shared.chat.TabComponent;
+import me.neznamy.tab.shared.platform.BossBar;
+import me.neznamy.tab.api.bossbar.BarColor;
+import me.neznamy.tab.api.bossbar.BarStyle;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * Handler for 1.9+ players on 1.8 server using ViaVersion API.
+ */
+@RequiredArgsConstructor
+public class ViaBossBar implements BossBar {
+
+    /** Style array for fast access */
+    private static final BossStyle[] styles = BossStyle.values();
+    
+    /** Player this handler belongs to */
+    @NotNull
+    private final BukkitTabPlayer player;
+
+    /** ViaVersion BossBars this 1.9+ player can see on 1.8 server */
+    @NotNull
+    private final Map<UUID, com.viaversion.viaversion.api.legacy.bossbar.BossBar> viaBossBars = new HashMap<>();
+
+    @Override
+    public void create(@NotNull UUID id, @NotNull String title, float progress, @NotNull BarColor color, @NotNull BarStyle style) {
+        if (viaBossBars.containsKey(id)) return;
+        com.viaversion.viaversion.api.legacy.bossbar.BossBar bar = Via.getAPI().legacyAPI().createLegacyBossBar(
+                TabComponent.optimized(title).toLegacyText(),
+                progress,
+                BossColor.valueOf(color.name()),
+                styles[style.ordinal()]
+        );
+        viaBossBars.put(id, bar);
+        bar.addPlayer(player.getPlayer().getUniqueId());
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull String title) {
+        viaBossBars.get(id).setTitle(TabComponent.optimized(title).toLegacyText());
+    }
+
+    @Override
+    public void update(@NotNull UUID id, float progress) {
+        viaBossBars.get(id).setHealth(progress);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarStyle style) {
+        viaBossBars.get(id).setStyle(styles[style.ordinal()]);
+    }
+
+    @Override
+    public void update(@NotNull UUID id, @NotNull BarColor color) {
+        viaBossBars.get(id).setColor(BossColor.valueOf(color.name()));
+    }
+
+    @Override
+    public void remove(@NotNull UUID id) {
+        viaBossBars.remove(id).removePlayer(player.getPlayer().getUniqueId());
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/entity/DataWatcher.java

@@ -0,0 +1,273 @@
+package me.neznamy.tab.platforms.bukkit.entity;
+
+import lombok.*;
+import me.neznamy.tab.platforms.bukkit.nms.ComponentConverter;
+import me.neznamy.tab.platforms.bukkit.nms.BukkitReflection;
+import me.neznamy.tab.shared.Limitations;
+import me.neznamy.tab.shared.ProtocolVersion;
+import me.neznamy.tab.shared.backend.EntityData;
+import me.neznamy.tab.shared.chat.TabComponent;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
+import java.util.*;
+
+/**
+ * A class representing the n.m.s.DataWatcher class to make work with it much easier
+ */
+@ToString
+public class DataWatcher implements EntityData {
+
+    private static Object DataWatcherSerializer_BYTE;
+    private static Object DataWatcherSerializer_FLOAT;
+    private static Object DataWatcherSerializer_STRING;
+    private static Object DataWatcherSerializer_OPTIONAL_COMPONENT;
+    private static Object DataWatcherSerializer_BOOLEAN;
+
+    private static final int armorStandFlagsPosition = EntityData.getArmorStandFlagsPosition(BukkitReflection.getMinorVersion());
+
+    /** 1.19.3+ */
+    private static Constructor<?> newDataWatcher$Item;
+
+    /** 1.19.2- */
+    public static Class<?> DataWatcher;
+    private static Constructor<?> newDataWatcher;
+    private static Method DataWatcher_register;
+    private static Constructor<?> newDataWatcherObject;
+
+    /** Watched data */
+    private final Map<Integer, Item> dataValues = new HashMap<>();
+
+    /**
+     * Loads all required Fields and throws Exception if something went wrong.
+     *
+     * @throws  ReflectiveOperationException
+     *          If something goes wrong
+     */
+    public static void load() throws ReflectiveOperationException {
+        int minorVersion = BukkitReflection.getMinorVersion();
+        if (minorVersion >= 9) {
+            loadSerializers();
+        }
+        if (BukkitReflection.is1_19_3Plus()) {
+            Class<?> dataWatcher$Item = BukkitReflection.getClass("network.syncher.SynchedEntityData$DataValue", "network.syncher.DataWatcher$c", "network.syncher.DataWatcher$b");
+            Class<?> dataWatcherSerializer = BukkitReflection.getClass("network.syncher.EntityDataSerializer",
+                    "network.syncher.DataWatcherSerializer", "DataWatcherSerializer");
+            newDataWatcher$Item = dataWatcher$Item.getConstructor(int.class, dataWatcherSerializer, Object.class);
+        } else {
+            DataWatcher = BukkitReflection.getClass("network.syncher.SynchedEntityData", "network.syncher.DataWatcher", "DataWatcher");
+            if (minorVersion >= 7) {
+                ComponentConverter.ensureAvailable();
+                newDataWatcher = DataWatcher.getConstructor(BukkitReflection.getClass("world.entity.Entity", "Entity"));
+            } else {
+                newDataWatcher = DataWatcher.getConstructor();
+            }
+            if (minorVersion >= 9) {
+                Class<?> dataWatcherObject = BukkitReflection.getClass("network.syncher.EntityDataAccessor",
+                        "network.syncher.DataWatcherObject", "DataWatcherObject");
+                Class<?> dataWatcherSerializer = BukkitReflection.getClass("network.syncher.EntityDataSerializer",
+                        "network.syncher.DataWatcherSerializer", "DataWatcherSerializer");
+                DataWatcher_register = ReflectionUtils.getMethod(
+                        DataWatcher,
+                        new String[]{"define", "register", "a", "m_135372_"}, // {Mojang, Bukkit, Bukkit 1.18+, Mohist 1.18.2}
+                        dataWatcherObject, Object.class
+                );
+                newDataWatcherObject = dataWatcherObject.getConstructor(int.class, dataWatcherSerializer);
+            } else {
+                DataWatcher_register = ReflectionUtils.getMethod(
+                        DataWatcher,
+                        new String[]{"func_75682_a", "a"}, int.class, // {Thermos 1.7.10, Bukkit}
+                        Object.class
+                );
+            }
+        }
+    }
+
+    private static void loadSerializers() throws ReflectiveOperationException {
+        Class<?> dataWatcherRegistry = BukkitReflection.getClass("network.syncher.EntityDataSerializers",
+                "network.syncher.DataWatcherRegistry", "DataWatcherRegistry");
+        DataWatcherSerializer_BYTE = ReflectionUtils.getField(dataWatcherRegistry, "BYTE", "a", "f_135027_").get(null); // Mohist 1.18.2
+        DataWatcherSerializer_FLOAT = ReflectionUtils.getField(dataWatcherRegistry, "FLOAT", "c", "f_135029_").get(null); // Mohist 1.18.2
+        DataWatcherSerializer_STRING = ReflectionUtils.getField(dataWatcherRegistry, "STRING", "d", "f_135030_").get(null); // Mohist 1.18.2
+        if (BukkitReflection.is1_19_3Plus()) {
+            DataWatcherSerializer_OPTIONAL_COMPONENT = ReflectionUtils.getField(dataWatcherRegistry, "OPTIONAL_COMPONENT", "g").get(null);
+            if (BukkitReflection.is1_19_4Plus()) {
+                DataWatcherSerializer_BOOLEAN = ReflectionUtils.getField(dataWatcherRegistry, "BOOLEAN", "k").get(null);
+            } else {
+                DataWatcherSerializer_BOOLEAN = ReflectionUtils.getField(dataWatcherRegistry, "BOOLEAN", "j").get(null);
+            }
+        } else {
+            if (BukkitReflection.getMinorVersion() >= 13) {
+                DataWatcherSerializer_OPTIONAL_COMPONENT = ReflectionUtils.getField(dataWatcherRegistry,
+                        "OPTIONAL_COMPONENT", "f", "f_135032_").get(null); // Mohist 1.18.2
+                DataWatcherSerializer_BOOLEAN = ReflectionUtils.getField(dataWatcherRegistry,
+                        "BOOLEAN", "i", "f_135035_").get(null); // Mohist 1.18.2
+            } else {
+                DataWatcherSerializer_BOOLEAN = dataWatcherRegistry.getDeclaredField("h").get(null);
+            }
+        }
+    }
+    
+    /**
+     * Sets value into data values
+     *
+     * @param   position
+     *          data position
+     * @param   serializer
+     *          Object serializer (1.9+)
+     * @param   value
+     *          value
+     */
+    public void setValue(int position, @Nullable Object serializer, @NotNull Object value) {
+        dataValues.put(position, new Item(position, serializer, value));
+    }
+
+    /**
+     * Writes entity byte flags
+     *
+     * @param   flags
+     *          flags to write
+     */
+    public void setEntityFlags(byte flags) {
+        setValue(0, DataWatcherSerializer_BYTE, flags);
+    }
+
+    /**
+     * Writes entity custom name with position based on server version and value depending on client version (RGB or not)
+     *
+     * @param   customName
+     *          target custom name
+     * @param   clientVersion
+     *          client version
+     */
+    public void setCustomName(@NotNull String customName, @NotNull ProtocolVersion clientVersion) {
+        if (BukkitReflection.getMinorVersion() >= 13) {
+            setValue(2, DataWatcherSerializer_OPTIONAL_COMPONENT, Optional.of(TabComponent.optimized(customName).convert(clientVersion)));
+        } else if (BukkitReflection.getMinorVersion() >= 8) {
+            setValue(2, DataWatcherSerializer_STRING, customName);
+        } else {
+            //name length is limited to 64 characters on <1.8
+            String cutName = (customName.length() > Limitations.BOSSBAR_NAME_LENGTH_1_7 ?
+                    customName.substring(0, Limitations.BOSSBAR_NAME_LENGTH_1_7) : customName);
+            if (BukkitReflection.getMinorVersion() >= 6) {
+                setValue(10, null, cutName);
+            } else {
+                setValue(5, null, cutName);
+            }
+        }
+    }
+
+    /**
+     * Writes custom name visibility boolean
+     *
+     * @param   visible
+     *          if visible or not
+     */
+    public void setCustomNameVisible(boolean visible) {
+        if (BukkitReflection.getMinorVersion() >= 9) {
+            setValue(3, DataWatcherSerializer_BOOLEAN, visible);
+        } else {
+            setValue(3, null, (byte)(visible?1:0));
+        }
+    }
+
+    /**
+     * Writes entity health
+     *
+     * @param   health
+     *          health of entity
+     */
+    public void setHealth(float health) {
+        if (BukkitReflection.getMinorVersion() >= 6) {
+            setValue(6, DataWatcherSerializer_FLOAT, health);
+        } else {
+            setValue(16, null, (int)health);
+        }
+    }
+
+    /**
+     * Writes armor stand flags
+     *
+     * @param   flags
+     *          flags to write
+     */
+    public void setArmorStandFlags(byte flags) {
+        setValue(armorStandFlagsPosition, DataWatcherSerializer_BYTE, flags);
+    }
+
+    /**
+     * Writes wither invulnerable time
+     * @param   time
+     *          Time, apparently
+     */
+    public void setWitherInvulnerableTime(int time) {
+        if (BukkitReflection.getMinorVersion() > 8)
+            throw new UnsupportedOperationException("Not supported on 1.9+");
+        setValue(20, null, time);
+    }
+
+    /**
+     * Converts the class into an instance of NMS.DataWatcher
+     *
+     * @return  an instance of NMS.DataWatcher with same data
+     */
+    @SneakyThrows
+    @NotNull
+    public Object build() {
+        if (BukkitReflection.is1_19_3Plus()) {
+            List<Object> items = new ArrayList<>();
+            for (Item item : dataValues.values()) {
+                items.add(newDataWatcher$Item.newInstance(item.position, item.serializer, item.value));
+            }
+            return items;
+        } else {
+            Object nmsWatcher;
+            if (newDataWatcher.getParameterCount() == 1) { //1.7+
+                nmsWatcher = newDataWatcher.newInstance(new Object[] {null});
+            } else {
+                nmsWatcher = newDataWatcher.newInstance();
+            }
+            for (Item item : dataValues.values()) {
+                Object nmsObject = item.createObject();
+                DataWatcher_register.invoke(nmsWatcher, nmsObject, item.getValue());
+            }
+            return nmsWatcher;
+        }
+    }
+
+    /**
+     * Class for specific data watcher item.
+     */
+    @RequiredArgsConstructor
+    @Getter
+    private static class Item {
+
+        /** Item position */
+        private final int position;
+
+        /** Item serializer (1.9+) */
+        @Nullable
+        private final Object serializer;
+
+        /** Item value */
+        @NonNull
+        private final Object value;
+
+        /**
+         * Creates data watcher object with position and serializer
+         *
+         * @return  NMS data watcher object
+         */
+        @SneakyThrows
+        public Object createObject() {
+            if (BukkitReflection.getMinorVersion() >= 9) {
+                return newDataWatcherObject.newInstance(position, serializer);
+            } else {
+                return position;
+            }
+        }
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/entity/PacketEntityView.java

@@ -0,0 +1,432 @@
+package me.neznamy.tab.platforms.bukkit.entity;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.SneakyThrows;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.platforms.bukkit.BukkitUtils;
+import me.neznamy.tab.platforms.bukkit.nms.BukkitReflection;
+import me.neznamy.tab.platforms.bukkit.nms.PacketSender;
+import me.neznamy.tab.shared.backend.EntityData;
+import me.neznamy.tab.shared.backend.Location;
+import me.neznamy.tab.shared.backend.entityview.EntityView;
+import me.neznamy.tab.shared.util.*;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.EntityType;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.*;
+import java.util.concurrent.Callable;
+import java.util.function.Function;
+
+/**
+ * EntityView implementation for Bukkit using packets.
+ */
+@RequiredArgsConstructor
+@SuppressWarnings("unchecked")
+public class PacketEntityView implements EntityView {
+
+    /** Version with entity metadata being split from spawn packet */
+    private static final int SPLIT_METADATA_VERSION = 15;
+
+    private static PacketSender packetSender;
+
+    /** PacketPlayOutEntityDestroy */
+    private static Class<?> EntityDestroyClass;
+    private static BiConsumerWithException<BukkitTabPlayer, int[]> destroyEntities;
+    private static FunctionWithException<Object, int[]> getDestroyedEntities;
+
+    /** PacketPlayOutEntityMetadata */
+    private static BiFunctionWithException<Integer, EntityData, Object> newEntityMetadata;
+    
+    /** PacketPlayOutEntityTeleport */
+    private static BiFunctionWithException<Integer, Location, Object> newEntityTeleport;
+    private static Class<?> EntityTeleportClass;
+    private static Field EntityTeleport_EntityId;
+
+    /** PacketPlayOutSpawnEntityLiving */
+    private static QuintFunction<Integer, UUID, Object, Location, EntityData, Object> newSpawnEntity;
+
+    /** Other entity packets */
+    private static Class<?> PacketPlayOutEntity;
+    private static Field PacketPlayOutEntity_ENTITYID;
+    private static Field PacketPlayOutEntity_X;
+    private static Field PacketPlayOutEntity_Y;
+    private static Field PacketPlayOutEntity_Z;
+    private static Class<?> PacketPlayOutEntityLook;
+    private static QuadFunction<Integer, Long, Long, Long, Object> newMovePacket;
+    private static Class<?> PacketPlayOutNamedEntitySpawn;
+    private static Field PacketPlayOutNamedEntitySpawn_ENTITYID;
+
+    private static Constructor<?> newClientboundBundlePacket;
+    private static Field ClientboundBundlePacket_packets;
+    private static Function<Object, Boolean> isBundlePacket = packet -> false;
+    private static BiConsumerWithException<BukkitTabPlayer, Iterable<?>> sendAsBundle = (player, packets) -> {
+        for (Object packet : packets) {
+            packetSender.sendPacket(player.getPlayer(), packet);
+        }
+    };
+
+    @Getter
+    private static boolean available;
+
+    /** Player this view belongs to */
+    private final BukkitTabPlayer player;
+
+    /**
+     * Loads all required classes and fields and marks class as available.
+     * If something goes wrong, a warning is printed and class is not marked as available.
+     */
+    public static void tryLoad() {
+        try {
+            DataWatcher.load();
+            loadEntityMetadata();
+            loadEntityDestroy();
+            loadEntityTeleport();
+            loadEntityMove();
+            loadEntitySpawn();
+            if (BukkitReflection.is1_19_4Plus()) {
+                Class<?> ClientboundBundlePacket = Class.forName("net.minecraft.network.protocol.game.ClientboundBundlePacket");
+                newClientboundBundlePacket = ClientboundBundlePacket.getConstructor(Iterable.class);
+                ClientboundBundlePacket_packets = ReflectionUtils.getOnlyField(ClientboundBundlePacket.getSuperclass(), Iterable.class);
+                isBundlePacket = ClientboundBundlePacket::isInstance;
+                sendAsBundle = (player, packets) -> packetSender.sendPacket(player.getPlayer(), newClientboundBundlePacket.newInstance(packets));
+            }
+            packetSender = new PacketSender();
+            available = true;
+        } catch (Exception e) {
+            List<String> missingFeatures = new ArrayList<>();
+            if (BukkitReflection.getMinorVersion() >= 8) {
+                missingFeatures.add("Unlimited nametag mode not working and being replaced with regular nametags");
+            }
+            if (BukkitReflection.getMinorVersion() <= 8) {
+                missingFeatures.add("BossBar feature not working");
+            }
+            BukkitUtils.compatibilityError(e, "sending entity packets", null, missingFeatures.toArray(new String[0]));
+        }
+    }
+
+    @SuppressWarnings("JavaReflectionInvocation")
+    private static void loadEntityMetadata() throws ReflectiveOperationException {
+        Class<?> entityMetadataClass = BukkitReflection.getClass("network.protocol.game.ClientboundSetEntityDataPacket",
+                "network.protocol.game.PacketPlayOutEntityMetadata", "PacketPlayOutEntityMetadata", "Packet40EntityMetadata");
+        if (BukkitReflection.is1_19_3Plus()) {
+            Constructor<?> constructor = entityMetadataClass.getConstructor(int.class, List.class);
+            newEntityMetadata = (entityId, data) -> constructor.newInstance(entityId, data.build());
+        } else {
+            Constructor<?> constructor = entityMetadataClass.getConstructor(int.class, DataWatcher.DataWatcher, boolean.class);
+            newEntityMetadata = (entityId, data) -> constructor.newInstance(entityId, data.build(), true);
+        }
+    }
+
+    private static void loadEntityDestroy() throws ReflectiveOperationException {
+        EntityDestroyClass = BukkitReflection.getClass("network.protocol.game.ClientboundRemoveEntitiesPacket",
+                "network.protocol.game.PacketPlayOutEntityDestroy", "PacketPlayOutEntityDestroy", "Packet29DestroyEntity");
+        Field entities = ReflectionUtils.getOnlyField(EntityDestroyClass);
+        try {
+            Constructor<?> constructor = EntityDestroyClass.getConstructor(int[].class);
+            destroyEntities = (player, ids) -> packetSender.sendPacket(player.getPlayer(), constructor.newInstance(new Object[]{ids}));
+            if (BukkitReflection.getMinorVersion() >= 17) {
+                getDestroyedEntities = packet -> ((List<Integer>) entities.get(packet)).stream().mapToInt(i -> i).toArray();
+            } else {
+                getDestroyedEntities = packet -> (int[]) entities.get(packet);
+            }
+        } catch (NoSuchMethodException e) {
+            //1.17.0 Mojank
+            Constructor<?> constructor = EntityDestroyClass.getConstructor(int.class);
+            destroyEntities = (player, ids) -> { for (int entity : ids) packetSender.sendPacket(player.getPlayer(), constructor.newInstance(entity));};
+            getDestroyedEntities = packet -> new int[]{entities.getInt(packet)};
+        }
+    }
+
+    private static void loadEntityTeleport() throws ReflectiveOperationException {
+        EntityTeleportClass = BukkitReflection.getClass("network.protocol.game.ClientboundTeleportEntityPacket",
+                "network.protocol.game.PacketPlayOutEntityTeleport", "PacketPlayOutEntityTeleport", "Packet34EntityTeleport");
+        Callable<Object> newPacket;
+        if (BukkitReflection.getMinorVersion() >= 17) {
+            // Dummy armor stand for constructor
+            Class<?> world = BukkitReflection.getClass("world.level.Level", "world.level.World", "World");
+            Class<?> entityArmorStand = BukkitReflection.getClass("world.entity.decoration.ArmorStand",
+                    "world.entity.decoration.EntityArmorStand", "EntityArmorStand");
+            Constructor<?> newEntityArmorStand = entityArmorStand.getConstructor(world, double.class, double.class, double.class);
+            Method World_getHandle = BukkitReflection.getBukkitClass("CraftWorld").getMethod("getHandle");
+            Object dummyEntity = newEntityArmorStand.newInstance(World_getHandle.invoke(Bukkit.getWorlds().get(0)), 0, 0, 0);
+
+            Constructor<?> constructor = EntityTeleportClass.getConstructor(BukkitReflection.getClass("world.entity.Entity"));
+            newPacket = () -> constructor.newInstance(dummyEntity);
+        } else {
+            Constructor<?> constructor = EntityTeleportClass.getConstructor();
+            newPacket = constructor::newInstance;
+        }
+
+        EntityTeleport_EntityId = ReflectionUtils.getFields(EntityTeleportClass, int.class).get(0);
+        Field EntityTeleport_X;
+        Field EntityTeleport_Y;
+        Field EntityTeleport_Z;
+        if (BukkitReflection.getMinorVersion() >= 9) {
+            EntityTeleport_X = ReflectionUtils.getFields(EntityTeleportClass, double.class).get(0);
+            EntityTeleport_Y = ReflectionUtils.getFields(EntityTeleportClass, double.class).get(1);
+            EntityTeleport_Z = ReflectionUtils.getFields(EntityTeleportClass, double.class).get(2);
+        } else {
+            EntityTeleport_X = ReflectionUtils.getFields(EntityTeleportClass, int.class).get(1);
+            EntityTeleport_Y = ReflectionUtils.getFields(EntityTeleportClass, int.class).get(2);
+            EntityTeleport_Z = ReflectionUtils.getFields(EntityTeleportClass, int.class).get(3);
+        }
+        newEntityTeleport = (entityId, location) -> {
+            Object packet = newPacket.call();
+            EntityTeleport_EntityId.set(packet, entityId);
+            EntityTeleport_X.set(packet, toPosition(location.getX()));
+            EntityTeleport_Y.set(packet, toPosition(location.getY()));
+            EntityTeleport_Z.set(packet, toPosition(location.getZ()));
+            return packet;
+        };
+    }
+
+    private static void loadEntityMove() throws ReflectiveOperationException {
+        // Classes
+        PacketPlayOutEntity = BukkitReflection.getClass("network.protocol.game.ClientboundMoveEntityPacket",
+                "network.protocol.game.PacketPlayOutEntity", "PacketPlayOutEntity", "Packet30Entity");
+        PacketPlayOutEntityLook = BukkitReflection.getClass("network.protocol.game.ClientboundMoveEntityPacket$Rot",
+                "network.protocol.game.PacketPlayOutEntity$PacketPlayOutEntityLook", "PacketPlayOutEntity$PacketPlayOutEntityLook",
+                "PacketPlayOutEntityLook", "Packet32EntityLook");
+        Class<?> packetPlayOutRelEntityMove = BukkitReflection.getClass("network.protocol.game.ClientboundMoveEntityPacket$Pos",
+                "network.protocol.game.PacketPlayOutEntity$PacketPlayOutRelEntityMove", "PacketPlayOutEntity$PacketPlayOutRelEntityMove",
+                "PacketPlayOutRelEntityMove", "Packet31RelEntityMove");
+
+
+        // Fields
+        PacketPlayOutEntity_ENTITYID = ReflectionUtils.getFields(PacketPlayOutEntity, int.class).get(0);
+
+        if (BukkitReflection.getMinorVersion() >= 14) {
+            List<Field> fields = ReflectionUtils.getFields(PacketPlayOutEntity, short.class);
+            PacketPlayOutEntity_X = fields.get(0);
+            PacketPlayOutEntity_Y = fields.get(1);
+            PacketPlayOutEntity_Z = fields.get(2);
+            Constructor<?> constructor = packetPlayOutRelEntityMove.getConstructor(int.class, short.class, short.class, short.class, boolean.class);
+            newMovePacket = (entityId, x, y, z) -> constructor.newInstance(entityId, x.shortValue(), y.shortValue(), z.shortValue(), false);
+        } else if (BukkitReflection.getMinorVersion() >= 9) {
+            List<Field> fields = ReflectionUtils.getFields(PacketPlayOutEntity, int.class);
+            PacketPlayOutEntity_X = fields.get(1);
+            PacketPlayOutEntity_Y = fields.get(2);
+            PacketPlayOutEntity_Z = fields.get(3);
+            Constructor<?> constructor = packetPlayOutRelEntityMove.getConstructor(int.class, long.class, long.class, long.class, boolean.class);
+            newMovePacket = (entityId, x, y, z) -> constructor.newInstance(entityId, x, y, z, false);
+        } else if (BukkitReflection.getMinorVersion() == 8) {
+            List<Field> fields = ReflectionUtils.getFields(PacketPlayOutEntity, byte.class);
+            PacketPlayOutEntity_X = fields.get(0);
+            PacketPlayOutEntity_Y = fields.get(1);
+            PacketPlayOutEntity_Z = fields.get(2);
+            Constructor<?> constructor = packetPlayOutRelEntityMove.getConstructor(int.class, byte.class, byte.class, byte.class, boolean.class);
+            newMovePacket = (entityId, x, y, z) -> constructor.newInstance(entityId, x.byteValue(), y.byteValue(), z.byteValue(), false);
+        }
+    }
+
+    /**
+     * Loads required NMS classes, fields and methods. If it fails, exception is thrown.
+     *
+     * @throws  ReflectiveOperationException
+     *          If anything fails
+     */
+    private static void loadEntitySpawn() throws ReflectiveOperationException {
+        int minorVersion = BukkitReflection.getMinorVersion();
+
+        // Entity ids
+        EnumMap<EntityType, Integer> entityIds = new EnumMap<>(EntityType.class);
+        if (minorVersion >= 13) {
+            entityIds.put(EntityType.ARMOR_STAND, 1);
+        } else {
+            entityIds.put(EntityType.WITHER, 64);
+            if (minorVersion >= 8) {
+                entityIds.put(EntityType.ARMOR_STAND, 30);
+            }
+        }
+
+        Class<?> SpawnEntityClass = BukkitReflection.getClass("network.protocol.game.ClientboundAddEntityPacket",
+                "network.protocol.game.PacketPlayOutSpawnEntity", "PacketPlayOutSpawnEntityLiving", "Packet24MobSpawn");
+        Field SpawnEntity_EntityId = ReflectionUtils.getFields(SpawnEntityClass, int.class).get(0);
+        if (BukkitReflection.is1_20_2Plus()) {
+            PacketPlayOutNamedEntitySpawn = SpawnEntityClass;
+            PacketPlayOutNamedEntitySpawn_ENTITYID = SpawnEntity_EntityId;
+        } else {
+            PacketPlayOutNamedEntitySpawn = BukkitReflection.getClass("network.protocol.game.ClientboundAddPlayerPacket",
+                    "network.protocol.game.PacketPlayOutNamedEntitySpawn", "PacketPlayOutNamedEntitySpawn", "Packet20NamedEntitySpawn");
+            PacketPlayOutNamedEntitySpawn_ENTITYID = ReflectionUtils.getFields(PacketPlayOutNamedEntitySpawn, int.class).get(0);
+        }
+        Constructor<?> constructor;
+
+        // 1.17+ constructor using Spawn entity packet
+        if (minorVersion >= 17) {
+            Class<?> Vec3D = BukkitReflection.getClass("world.phys.Vec3", "world.phys.Vec3D");
+            Object Vec3D_Empty = ReflectionUtils.getOnlyField(Vec3D, Vec3D).get(null);
+            Class<?> EntityTypes = BukkitReflection.getClass("world.entity.EntityType", "world.entity.EntityTypes");
+            if (minorVersion >= 19) {
+                Object EntityTypes_ARMOR_STAND = ReflectionUtils.getField(EntityTypes, "ARMOR_STAND", "d").get(null);
+                constructor = SpawnEntityClass.getConstructor(int.class, UUID.class, double.class, double.class, double.class, float.class, float.class, EntityTypes, int.class, Vec3D, double.class);
+                newSpawnEntity = (id, uuid, type, l, data) -> constructor.newInstance(id, uuid, l.getX(), l.getY(), l.getZ(), 0, 0, EntityTypes_ARMOR_STAND, 0, Vec3D_Empty, 0.0d);
+            } else {
+                Object EntityTypes_ARMOR_STAND = ReflectionUtils.getField(EntityTypes, "ARMOR_STAND", "c", "f_20529_").get(null); // Mohist 1.18.2
+                constructor = SpawnEntityClass.getConstructor(int.class, UUID.class, double.class, double.class, double.class, float.class, float.class, EntityTypes, int.class, Vec3D);
+                newSpawnEntity = (id, uuid, type, l, data) -> constructor.newInstance(id, uuid, l.getX(), l.getY(), l.getZ(), 0, 0, EntityTypes_ARMOR_STAND, 0, Vec3D_Empty);
+            }
+            return;
+        }
+
+        // 1.16- constructor using spawn entity living packet
+        constructor = SpawnEntityClass.getConstructor();
+        @Nullable Field SpawnEntity_UUID;
+        Field SpawnEntity_X;
+        Field SpawnEntity_Y;
+        Field SpawnEntity_Z;
+        @Nullable Field SpawnEntity_DataWatcher;
+        Field SpawnEntity_EntityType = ReflectionUtils.getFields(SpawnEntityClass, int.class).get(1);
+        if (minorVersion >= 9) {
+            SpawnEntity_UUID = ReflectionUtils.getOnlyField(SpawnEntityClass, UUID.class);
+            SpawnEntity_X = ReflectionUtils.getFields(SpawnEntityClass, double.class).get(0);
+            SpawnEntity_Y = ReflectionUtils.getFields(SpawnEntityClass, double.class).get(1);
+            SpawnEntity_Z = ReflectionUtils.getFields(SpawnEntityClass, double.class).get(2);
+        } else {
+            SpawnEntity_UUID = null;
+            SpawnEntity_X = ReflectionUtils.getFields(SpawnEntityClass, int.class).get(2);
+            SpawnEntity_Y = ReflectionUtils.getFields(SpawnEntityClass, int.class).get(3);
+            SpawnEntity_Z = ReflectionUtils.getFields(SpawnEntityClass, int.class).get(4);
+        }
+        if (minorVersion < SPLIT_METADATA_VERSION) {
+            SpawnEntity_DataWatcher = ReflectionUtils.getOnlyField(SpawnEntityClass, DataWatcher.DataWatcher);
+        } else {
+            SpawnEntity_DataWatcher = null;
+        }
+        newSpawnEntity = (id, uuid, type, l, data) -> {
+            Object nmsPacket = constructor.newInstance();
+            SpawnEntity_EntityId.set(nmsPacket, id);
+            if (minorVersion < SPLIT_METADATA_VERSION) SpawnEntity_DataWatcher.set(nmsPacket, data.build());
+            if (minorVersion >= 9) SpawnEntity_UUID.set(nmsPacket, uuid);
+            SpawnEntity_X.set(nmsPacket, toPosition(l.getX()));
+            SpawnEntity_Y.set(nmsPacket, toPosition(l.getY()));
+            SpawnEntity_Z.set(nmsPacket, toPosition(l.getZ()));
+            SpawnEntity_EntityType.set(nmsPacket, entityIds.get((EntityType) type));
+            return nmsPacket;
+        };
+    }
+
+    private static Object toPosition(double paramDouble) {
+        if (BukkitReflection.getMinorVersion() >= 9) {
+            return paramDouble;
+        } else {
+            int i = (int) (paramDouble*32);
+            return paramDouble < i ? i - 1 : i;
+        }
+    }
+
+    @SneakyThrows
+    @Override
+    public void spawnEntity(int entityId, @NotNull UUID id, @NotNull Object entityType, @NotNull Location l, @NotNull EntityData data) {
+        if (BukkitReflection.getMinorVersion() >= SPLIT_METADATA_VERSION) {
+            sendAsBundle.accept(player, Arrays.asList(
+                    newSpawnEntity.apply(entityId, id, entityType, l, null),
+                    newEntityMetadata.apply(entityId, data)
+            ));
+        } else {
+            packetSender.sendPacket(player.getPlayer(), newSpawnEntity.apply(entityId, id, entityType, l, data));
+        }
+    }
+
+    @Override
+    @SneakyThrows
+    public void updateEntityMetadata(int entityId, @NotNull EntityData data) {
+        packetSender.sendPacket(player.getPlayer(), newEntityMetadata.apply(entityId, data));
+    }
+
+    @SneakyThrows
+    @Override
+    public void teleportEntity(int entityId, @NotNull Location location) {
+        packetSender.sendPacket(player.getPlayer(), newEntityTeleport.apply(entityId, location));
+    }
+
+    @SneakyThrows
+    @Override
+    public void destroyEntities(int... entities) {
+        destroyEntities.accept(player, entities);
+    }
+
+    @Override
+    public boolean isDestroyPacket(@NotNull Object packet) {
+        return EntityDestroyClass.isInstance(packet);
+    }
+
+    @Override
+    public boolean isTeleportPacket(@NotNull Object packet) {
+        return EntityTeleportClass.isInstance(packet);
+    }
+
+    @Override
+    public boolean isNamedEntitySpawnPacket(@NotNull Object packet) {
+        return PacketPlayOutNamedEntitySpawn.isInstance(packet);
+    }
+
+    @Override
+    public boolean isMovePacket(@NotNull Object packet) {
+        return PacketPlayOutEntity.isInstance(packet);
+    }
+
+    @Override
+    public boolean isLookPacket(@NotNull Object packet) {
+        return PacketPlayOutEntityLook.isInstance(packet);
+    }
+
+    @Override
+    @SneakyThrows
+    public int getTeleportEntityId(@NotNull Object teleportPacket) {
+        return EntityTeleport_EntityId.getInt(teleportPacket);
+    }
+
+    @Override
+    @SneakyThrows
+    public int getMoveEntityId(@NotNull Object movePacket) {
+        return PacketPlayOutEntity_ENTITYID.getInt(movePacket);
+    }
+
+    @Override
+    @SneakyThrows
+    public int getSpawnedPlayer(@NotNull Object playerSpawnPacket) {
+        return PacketPlayOutNamedEntitySpawn_ENTITYID.getInt(playerSpawnPacket);
+    }
+
+    @Override
+    @SneakyThrows
+    public int[] getDestroyedEntities(@NotNull Object destroyPacket) {
+        return getDestroyedEntities.apply(destroyPacket);
+    }
+
+    @Override
+    public boolean isBundlePacket(@NotNull Object packet) {
+        return isBundlePacket.apply(packet);
+    }
+
+    @Override
+    @SneakyThrows
+    public Iterable<Object> getPackets(@NotNull Object bundlePacket) {
+        return (Iterable<Object>) ClientboundBundlePacket_packets.get(bundlePacket);
+    }
+
+    @Override
+    @SneakyThrows
+    @NotNull
+    public Location getMoveDiff(@NotNull Object movePacket) {
+        return new Location(
+                ((Number)PacketPlayOutEntity_X.get(movePacket)).intValue(),
+                ((Number)PacketPlayOutEntity_Y.get(movePacket)).intValue(),
+                ((Number)PacketPlayOutEntity_Z.get(movePacket)).intValue()
+        );
+    }
+
+    @Override
+    @SneakyThrows
+    public void moveEntity(int entityId, @NotNull Location moveDiff) {
+        packetSender.sendPacket(player.getPlayer(), newMovePacket.apply(
+                entityId, (long) moveDiff.getX(), (long) moveDiff.getY(), (long) moveDiff.getZ()));
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/BukkitNameTagX.java

@@ -0,0 +1,195 @@
+package me.neznamy.tab.platforms.bukkit.features;
+
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.platforms.bukkit.nms.BukkitReflection;
+import me.neznamy.tab.platforms.bukkit.entity.DataWatcher;
+import me.neznamy.tab.platforms.bukkit.platform.BukkitPlatform;
+import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.backend.EntityData;
+import me.neznamy.tab.shared.backend.features.unlimitedtags.BackendNameTagX;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Pose;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerRespawnEvent;
+import org.bukkit.event.player.PlayerToggleSneakEvent;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.stream.Collectors;
+
+/**
+ * The core class for unlimited NameTag mode on Bukkit
+ */
+public class BukkitNameTagX extends BackendNameTagX implements Listener {
+
+    /** Version in which multiple passenger option was added */
+    private static final int MULTI_PASSENGER_VERSION = 11;
+
+    /**
+     * Constructs new instance and registers the class listener.
+     *
+     * @param   plugin
+     *          Plugin instance to use for registering listener
+     */
+    public BukkitNameTagX(@NotNull JavaPlugin plugin) {
+        Bukkit.getPluginManager().registerEvents(this, plugin);
+    }
+
+    /**
+     * Listener to player sneak event to sneak armor stands.
+     *
+     * @param   e
+     *          Sneak event
+     */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onSneak(PlayerToggleSneakEvent e) {
+        sneak(e.getPlayer().getUniqueId(), e.isSneaking());
+    }
+
+    /**
+     * Listener to respawn event to resend armor stands.
+     *
+     * @param   e
+     *          Respawn event
+     */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onRespawn(PlayerRespawnEvent e) {
+        respawn(e.getPlayer().getUniqueId());
+    }
+
+    @Override
+    public double getDistance(@NotNull TabPlayer player1, @NotNull TabPlayer player2) {
+        Location loc1 = ((Player) player1.getPlayer()).getLocation();
+        Location loc2 = ((Player) player2.getPlayer()).getLocation();
+        return Math.sqrt(Math.pow(loc1.getX()-loc2.getX(), 2) + Math.pow(loc1.getZ()-loc2.getZ(), 2));
+    }
+
+    @Override
+    public boolean areInSameWorld(@NotNull TabPlayer player1, @NotNull TabPlayer player2) {
+        return ((Player) player1.getPlayer()).getWorld() == ((Player) player2.getPlayer()).getWorld();
+    }
+
+    @Override
+    public boolean canSee(@NotNull TabPlayer viewer, @NotNull TabPlayer target) {
+        return ((Player)viewer.getPlayer()).canSee((Player) target.getPlayer());
+    }
+
+    @Override
+    public void unregisterListener() {
+        HandlerList.unregisterAll(this);
+    }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    @NotNull
+    public List<Integer> getPassengers(@NotNull Object entity) {
+        Entity vehicle = (Entity) entity;
+        if (BukkitReflection.getMinorVersion() >= MULTI_PASSENGER_VERSION) {
+            return vehicle.getPassengers().stream().map(Entity::getEntityId).collect(Collectors.toList());
+        } else {
+            if (vehicle.getPassenger() != null) {
+                return Collections.singletonList(vehicle.getPassenger().getEntityId());
+            } else {
+                return Collections.emptyList();
+            }
+        }
+    }
+
+    @Override
+    @Nullable
+    public Object getVehicle(@NotNull TabPlayer player) {
+        return ((Player)player.getPlayer()).getVehicle();
+    }
+
+    @Override
+    public int getEntityId(@NotNull Object entity) {
+        return ((Entity)entity).getEntityId();
+    }
+
+    @Override
+    @NotNull
+    public String getEntityType(@NotNull Object entity) {
+        return ((Entity) entity).getType().toString().toLowerCase(Locale.US);
+    }
+
+    @Override
+    public boolean isSneaking(@NotNull TabPlayer player) {
+        return ((Player)player.getPlayer()).isSneaking();
+    }
+
+    @Override
+    public boolean isSwimming(@NotNull TabPlayer player) {
+        Player p = (Player) player.getPlayer();
+        if (BukkitReflection.getMinorVersion() >= 14 && p.getPose() == Pose.SWIMMING) return true;
+        return BukkitReflection.getMinorVersion() == 13 && p.isSwimming();
+    }
+
+    @Override
+    public boolean isGliding(@NotNull TabPlayer player) {
+        return BukkitReflection.getMinorVersion() >= 9 && ((Player)player.getPlayer()).isGliding();
+    }
+
+    @Override
+    public boolean isSleeping(@NotNull TabPlayer player) {
+        return ((Player)player.getPlayer()).isSleeping();
+    }
+
+    @Override
+    @NotNull
+    public Object getArmorStandType() {
+        return EntityType.ARMOR_STAND;
+    }
+
+    @Override
+    public double getX(@NotNull TabPlayer player) {
+        return ((Player)player.getPlayer()).getLocation().getX();
+    }
+
+    @Override
+    public double getY(@NotNull Object entity) {
+        return ((Entity)entity).getLocation().getY();
+    }
+
+    @Override
+    public double getZ(@NotNull TabPlayer player) {
+        return ((Player)player.getPlayer()).getLocation().getZ();
+    }
+
+    @Override
+    @NotNull
+    public EntityData createDataWatcher(@NotNull TabPlayer viewer, byte flags, @NotNull String displayName, boolean nameVisible) {
+        DataWatcher datawatcher = new DataWatcher();
+        datawatcher.setEntityFlags(flags);
+        datawatcher.setCustomName(displayName, viewer.getVersion());
+        datawatcher.setCustomNameVisible(nameVisible);
+        datawatcher.setArmorStandFlags(datawatcher.MARKER_FLAG);
+        return datawatcher;
+    }
+
+    @Override
+    public void runInEntityScheduler(@NotNull Object entity, @NotNull Runnable task) {
+        ((BukkitPlatform)TAB.getInstance().getPlatform()).runEntityTask((Entity) entity, task);
+    }
+
+    @Override
+    public boolean isDead(@NotNull TabPlayer player) {
+        return ((BukkitTabPlayer)player).getPlayer().isDead();
+    }
+
+    @Override
+    public boolean isFlying(@NotNull TabPlayer player) {
+        return ((BukkitTabPlayer)player).getPlayer().isFlying();
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/BukkitTabExpansion.java

@@ -3,30 +3,54 @@ package me.neznamy.tab.platforms.bukkit.features;
 import lombok.Getter;
 import me.clip.placeholderapi.PlaceholderAPI;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
+import me.neznamy.tab.shared.platform.TabPlayer;
 import me.neznamy.tab.shared.placeholders.expansion.TabExpansion;
+import me.neznamy.tab.shared.util.ReflectionUtils;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.WeakHashMap;
+import java.util.*;
 
 /**
  * TAB's expansion for PlaceholderAPI
  */
+@Getter
 public class BukkitTabExpansion extends PlaceholderExpansion implements TabExpansion {
 
     /** Map holding all values for all players for easy and high-performance access */
-    private final WeakHashMap<Player, Map<String, String>> values = new WeakHashMap<>();
+    @NotNull
+    private final WeakHashMap<TabPlayer, Map<String, String>> values = new WeakHashMap<>();
 
-    @Getter private final String author = TabConstants.PLUGIN_AUTHOR;
-    @Getter private final String identifier = TabConstants.PLUGIN_ID;
-    @Getter private final String version = TabConstants.PLUGIN_VERSION;
+    /** List of all placeholders offered by the plugin for command suggestions */
+    @NotNull
+    private final List<String> placeholders = Collections.unmodifiableList(Arrays.asList(
+            "%tab_tabprefix%",
+            "%tab_tabsuffix%",
+            "%tab_tagprefix%",
+            "%tab_tagsuffix%",
+            "%tab_customtabname%",
+            "%tab_customtagname%",
+            "%tab_belowname%",
+            "%tab_abovename%",
+            "%tab_tabprefix_raw%",
+            "%tab_tabsuffix_raw%",
+            "%tab_tagprefix_raw%",
+            "%tab_tagsuffix_raw%",
+            "%tab_customtabname_raw%",
+            "%tab_customtagname_raw%",
+            "%tab_belowname_raw%",
+            "%tab_abovename_raw%",
+            "%tab_scoreboard_name%",
+            "%tab_scoreboard_visible%",
+            "%tab_bossbar_visible%",
+            "%tab_nametag_preview%",
+            "%tab_nametag_visibility%",
+            "%tab_replace_<placeholder>%",
+            "%tab_placeholder_<placeholder>%"
+    ));
 
     @Override
     public boolean persist() {
@@ -34,27 +58,66 @@ public class BukkitTabExpansion extends PlaceholderExpansion implements TabExpan
     }
 
     @Override
-    public String onPlaceholderRequest(Player player, @NotNull String identifier) {
+    @NotNull
+    public String getAuthor() {
+        return TabConstants.PLUGIN_AUTHOR;
+    }
+
+    @Override
+    @NotNull
+    public String getIdentifier() {
+        return TabConstants.PLUGIN_ID;
+    }
+
+    @Override
+    @NotNull
+    public String getVersion() {
+        return TabConstants.PLUGIN_VERSION;
+    }
+
+    @Override
+    @NotNull
+    public List<String> getPlaceholders() {
+        return placeholders;
+    }
+
+    @Override
+    @Nullable
+    public String onPlaceholderRequest(@Nullable Player player, @NotNull String identifier) {
         if (identifier.startsWith("replace_")) {
             String text = "%" + identifier.substring(8) + "%";
             String textBefore;
             do {
                 textBefore = text;
                 for (String placeholder : TAB.getInstance().getPlaceholderManager().detectPlaceholders(text)) {
-                    text = text.replace(placeholder, TabAPI.getInstance().getPlaceholderManager().findReplacement(placeholder,
+                    text = text.replace(placeholder, TAB.getInstance().getPlaceholderManager().findReplacement(placeholder,
                             PlaceholderAPI.setPlaceholders(player, placeholder)));
                 }
             } while (!textBefore.equals(text));
             return text;
         }
         if (identifier.startsWith("placeholder_")) {
-            TabAPI.getInstance().getPlaceholderManager().addUsedPlaceholder("%" + identifier.substring(12) + "%", (TabFeature) TabAPI.getInstance().getPlaceholderManager());
+            TAB.getInstance().getPlaceholderManager().addUsedPlaceholder("%" + identifier.substring("placeholder_".length()) + "%", TAB.getInstance().getPlaceholderManager());
         }
-        return values.get(player).get(identifier);
+        if (player == null) return "<Player cannot be null>";
+        TabPlayer p = TAB.getInstance().getPlayer(player.getUniqueId());
+        if (p == null || !p.isLoaded()) return "<Player is not loaded>";
+        return values.get(p).get(identifier);
     }
 
     @Override
-    public void setValue(TabPlayer player, String key, String value) {
-        values.computeIfAbsent((Player) player.getPlayer(), p -> new HashMap<>()).put(key, value);
+    public void setValue(@NotNull TabPlayer player, @NotNull String key, @NotNull String value) {
+        values.computeIfAbsent(player, p -> new HashMap<>()).put(key, value);
+    }
+
+    @Override
+    @SuppressWarnings({"UnstableApiUsage", "deprecation"})
+    public void unregisterExpansion() {
+        if (ReflectionUtils.methodExists(PlaceholderExpansion.class, "unregister")) {
+            // Added in 2.10.7 (Jul 28, 2020)
+            unregister();
+        } else {
+            PlaceholderAPI.unregisterExpansion(this);
+        }
     }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/PerWorldPlayerList.java

@@ -5,9 +5,9 @@ import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.TabAPI;
+import me.neznamy.tab.platforms.bukkit.BukkitUtils;
+import me.neznamy.tab.shared.features.types.Loadable;
+import me.neznamy.tab.shared.features.types.UnLoadable;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -17,43 +17,55 @@ import org.bukkit.event.player.PlayerChangedWorldEvent;
 import org.bukkit.event.player.PlayerJoinEvent;
 import org.bukkit.plugin.java.JavaPlugin;
 
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabConstants;
+import me.neznamy.tab.shared.features.types.TabFeature;
+import me.neznamy.tab.shared.TabConstants;
 import me.neznamy.tab.shared.TAB;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Per-world-PlayerList feature handler
  */
 @SuppressWarnings("deprecation")
-@RequiredArgsConstructor
-public class PerWorldPlayerList extends TabFeature implements Listener {
+public class PerWorldPlayerList extends TabFeature implements Listener, Loadable, UnLoadable {
 
     /** Config options */
-    private final boolean allowBypass = TabAPI.getInstance().getConfig().getBoolean("per-world-playerlist.allow-bypass-permission", false);
-    private final List<String> ignoredWorlds = TabAPI.getInstance().getConfig().getStringList("per-world-playerlist.ignore-effect-in-worlds", Arrays.asList("ignoredworld", "build"));
-    private final Map<String, List<String>> sharedWorlds = TabAPI.getInstance().getConfig().getConfigurationSection("per-world-playerlist.shared-playerlist-world-groups");
+    private final boolean allowBypass = config().getBoolean("per-world-playerlist.allow-bypass-permission", false);
+    private final List<String> ignoredWorlds = config().getStringList("per-world-playerlist.ignore-effect-in-worlds", Arrays.asList("ignored_world", "build"));
+    private final Map<String, List<String>> sharedWorlds = config().getConfigurationSection("per-world-playerlist.shared-playerlist-world-groups");
 
-    /** Plugin reference*/
-    private final JavaPlugin plugin;
-
-    @Getter private final String featureName = "Per world PlayerList";
-
-    @Override
-    public void load() {
-        Bukkit.getOnlinePlayers().forEach(this::checkPlayer);
+    /**
+     * Constructs new instance and registers events
+     *
+     * @param   plugin
+     *          Plugin instance to register events
+     */
+    public PerWorldPlayerList(JavaPlugin plugin) {
         Bukkit.getPluginManager().registerEvents(this, plugin);
     }
 
+    @Override
+    public void load() {
+        for (Player p : BukkitUtils.getOnlinePlayers()) {
+            checkPlayer(p);
+        }
+    }
+
     @Override
     public void unload() {
-        for (Player p : Bukkit.getOnlinePlayers()) {
-            for (Player pl : Bukkit.getOnlinePlayers()) {
+        for (Player p : BukkitUtils.getOnlinePlayers()) {
+            for (Player pl : BukkitUtils.getOnlinePlayers()) {
                 p.showPlayer(pl);
             }
         }
         HandlerList.unregisterAll(this);
     }
 
+    /**
+     * Join event listener to synchronously perform hiding.
+     *
+     * @param   e
+     *          Join event
+     */
     @EventHandler
     public void onJoin(PlayerJoinEvent e) {
         long time = System.nanoTime();
@@ -61,6 +73,12 @@ public class PerWorldPlayerList extends TabFeature implements Listener {
         TAB.getInstance().getCPUManager().addTime(getFeatureName(), TabConstants.CpuUsageCategory.PLAYER_JOIN, System.nanoTime()-time);
     }
 
+    /**
+     * World change listener to synchronously perform player showing/hiding.
+     *
+     * @param   e
+     *          World change event
+     */
     @EventHandler
     public void onWorldChange(PlayerChangedWorldEvent e) {
         long time = System.nanoTime();
@@ -76,8 +94,8 @@ public class PerWorldPlayerList extends TabFeature implements Listener {
      * @param   p
      *          Player to update
      */
-    private void checkPlayer(Player p) {
-        for (Player all : Bukkit.getOnlinePlayers()) {
+    private void checkPlayer(@NotNull Player p) {
+        for (Player all : BukkitUtils.getOnlinePlayers()) {
             if (all == p) continue;
             if (!shouldSee(p, all) && p.canSee(all)) p.hidePlayer(all);
             if (shouldSee(p, all) && !p.canSee(all)) p.showPlayer(all);
@@ -94,7 +112,7 @@ public class PerWorldPlayerList extends TabFeature implements Listener {
      *          Target displayed in the TabList
      * @return  {@code true} if viewer should see target, {@code false} if not.
      */
-    private boolean shouldSee(Player viewer, Player target) {
+    private boolean shouldSee(@NotNull Player viewer, @NotNull Player target) {
         if (target == viewer) return true;
         if ((allowBypass && viewer.hasPermission(TabConstants.Permission.PER_WORLD_PLAYERLIST_BYPASS)) || ignoredWorlds.contains(viewer.getWorld().getName())) return true;
         String viewerWorldGroup = viewer.getWorld().getName() + "-default"; //preventing unwanted behavior when some group is called exactly like a world
@@ -107,4 +125,10 @@ public class PerWorldPlayerList extends TabFeature implements Listener {
         }
         return viewerWorldGroup.equals(targetWorldGroup);
     }
+
+    @Override
+    @NotNull
+    public String getFeatureName() {
+        return "Per world PlayerList";
+    }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/PetFix.java

@@ -1,155 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features;
-
-import lombok.Getter;
-import me.neznamy.tab.api.TabFeature;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutEntityMetadataStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutSpawnEntityLivingStorage;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcherItem;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcherObject;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-
-import java.util.ConcurrentModificationException;
-import java.util.List;
-import java.util.Optional;
-import java.util.WeakHashMap;
-
-/**
- * A feature to disable minecraft 1.9+ feature making tamed animals
- * with custom names copy NameTag properties of their owner.
- * This is achieved by listening to entity spawn (<1.15) / entity metadata
- * packets and removing owner field from the DataWatcher list.
- * Since 1.16 this results in client sending entity use packet twice,
- * so we must cancel the 2nd one to prevent double toggle.
- */
-public class PetFix extends TabFeature {
-
-    /** NMS Storage reference for quick access */
-    private final NMSStorage nms = NMSStorage.getInstance();
-
-    /** DataWatcher position of pet owner field */
-    private final int petOwnerPosition = getPetOwnerPosition();
-
-    /** Logger of last interacts to prevent feature not working on 1.16 */
-    private final WeakHashMap<TabPlayer, Long> lastInteractFix = new WeakHashMap<>();
-
-    /**
-     * Since 1.16, client sends interact packet twice for entities affected
-     * by removed owner field. Because of that, we need to cancel the duplicated
-     * packet to avoid double toggle and preventing the entity from getting
-     * its pose changed. The duplicated packet is usually sent instantly in the
-     * same millisecond, however, when installing ProtocolLib with MyPet, the delay
-     * is up to 3 ticks. When holding right-click on an entity, interact is sent every
-     * 200 milliseconds, which is the value we should not go above. Optimal value is
-     * therefore between 150 and 200 milliseconds.
-     */
-    private static final int INTERACT_COOLDOWN = 160;
-
-    @Getter private final String featureName = "Pet name fix";
-
-    /**
-     * Returns position of pet owner field based on server version
-     *
-     * @return  position of pet owner field based on server version
-     */
-    private int getPetOwnerPosition() {
-        if (nms.getMinorVersion() >= 17) {
-            //1.17.x, 1.18.x, 1.19.x
-            return 18;
-        } else if (nms.getMinorVersion() >= 15) {
-            //1.15.x, 1.16.x
-            return 17;
-        } else if (nms.getMinorVersion() >= 14) {
-            //1.14.x
-            return 16;
-        } else if (nms.getMinorVersion() >= 10) {
-            //1.10.x - 1.13.x
-            return 14;
-        } else {
-            //1.9.x
-            return 13;
-        }
-    }
-
-    /**
-     * Cancels a packet if previous one arrived with no delay to prevent double toggle since 1.16
-     *
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    @Override
-    public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
-        if (nms.PacketPlayInUseEntity.isInstance(packet) && isInteract(nms.PacketPlayInUseEntity_ACTION.get(packet))) {
-            if (System.currentTimeMillis() - lastInteractFix.getOrDefault(sender, 0L) < INTERACT_COOLDOWN) {
-                //last interact packet was sent right now, cancelling to prevent double-toggle due to this feature enabled
-                return true;
-            }
-            //this is the first packet, saving player so the next packet can be cancelled
-            lastInteractFix.put(sender, System.currentTimeMillis());
-        }
-        return false;
-    }
-
-    /**
-     * Checks if the provided entity use action is INTERACT or not.
-     *
-     * @param   action
-     *          Action to check
-     * @return {@code true} if action is INTERACT, {@code false} if not.
-     */
-    private boolean isInteract(Object action) {
-        if (nms.getMinorVersion() >= 17) {
-            return nms.PacketPlayInUseEntity$d.isInstance(action);
-        } else {
-            return action.toString().equals("INTERACT");
-        }
-    }
-
-    /**
-     * Removes pet owner field from DataWatcher
-     *
-     * @throws  ReflectiveOperationException
-     *          if thrown by reflective operation
-     */
-    @SuppressWarnings("unchecked")
-    @Override
-    public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
-        if (PacketPlayOutEntityMetadataStorage.CLASS.isInstance(packet)) {
-            Object removedEntry = null;
-            List<Object> items = (List<Object>) PacketPlayOutEntityMetadataStorage.LIST.get(packet);
-            if (items == null) return;
-            try {
-                for (Object item : items) {
-                    if (item == null) continue;
-                    int slot;
-                    Object value;
-                    if (nms.is1_19_3Plus()) {
-                        slot = DataWatcher.DataValue_POSITION.getInt(item);
-                        value = DataWatcher.DataValue_VALUE.get(item);
-                    } else {
-                        slot = DataWatcherObject.SLOT.getInt(DataWatcherItem.TYPE.get(item));
-                        value = DataWatcherItem.VALUE.get(item);
-                    }
-                    if (slot == petOwnerPosition) {
-                        if (value instanceof Optional || value instanceof com.google.common.base.Optional) {
-                            removedEntry = item;
-                        }
-                    }
-                }
-                if (removedEntry != null) items.remove(removedEntry);
-            } catch (ConcurrentModificationException e) {
-                //no idea how can this list change in another thread since it's created for the packet but whatever, try again
-                onPacketSend(receiver, packet);
-            }
-        } else if (PacketPlayOutSpawnEntityLivingStorage.CLASS.isInstance(packet) && PacketPlayOutSpawnEntityLivingStorage.DATA_WATCHER != null) {
-            //<1.15
-            DataWatcher watcher = DataWatcher.fromNMS(PacketPlayOutSpawnEntityLivingStorage.DATA_WATCHER.get(packet));
-            DataWatcherItem petOwner = watcher.getItem(petOwnerPosition);
-            if (petOwner != null && (petOwner.getValue() instanceof Optional || petOwner.getValue() instanceof com.google.common.base.Optional)) {
-                watcher.removeValue(petOwnerPosition);
-                PacketPlayOutSpawnEntityLivingStorage.DATA_WATCHER.set(packet, watcher.build());
-            }
-        }
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/WitherBossBar.java

@@ -1,55 +1,64 @@
 package me.neznamy.tab.platforms.bukkit.features;
 
 import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabPlayer;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.shared.TabConstants;
+import me.neznamy.tab.shared.platform.TabPlayer;
 import me.neznamy.tab.api.bossbar.BossBar;
+import me.neznamy.tab.shared.features.types.WorldSwitchListener;
 import me.neznamy.tab.shared.TAB;
-import me.neznamy.tab.shared.backend.protocol.PacketPlayOutEntityTeleport;
+import me.neznamy.tab.shared.backend.BackendTabPlayer;
 import me.neznamy.tab.shared.features.bossbar.BossBarManagerImpl;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
-import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.HandlerList;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerRespawnEvent;
 import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * An additional class with additional code for <1.9 servers due to an entity being required
  */
 @RequiredArgsConstructor
-public class WitherBossBar extends BossBarManagerImpl implements Listener {
+public class WitherBossBar extends BossBarManagerImpl implements Listener, WorldSwitchListener {
 
-    /** Distance of the Wither in blocks */
+    /** Distance of the wither in blocks */
     private static final int WITHER_DISTANCE = 60;
 
-    /** Reference to plugin for registering listener */
-    private final JavaPlugin plugin;
+    /**
+     * Constructs new instance and registers events
+     *
+     * @param   plugin
+     *          Plugin instance to register events
+     */
+    public WitherBossBar(JavaPlugin plugin) {
+        Bukkit.getPluginManager().registerEvents(this, plugin);
+    }
 
     @Override
     public void load() {
-        Bukkit.getPluginManager().registerEvents(this, plugin);
         //when MC is on fullscreen, BossBar disappears after 1 second of not being seen
         //when in a small window, it's about 100ms
         TAB.getInstance().getCPUManager().startRepeatingMeasuredTask(100,
-                this, TabConstants.CpuUsageCategory.TELEPORTING_WITHER, this::teleport);
+                getFeatureName(), TabConstants.CpuUsageCategory.TELEPORTING_WITHER, this::teleport);
         super.load();
         teleport();
     }
 
     /**
-     * Updates Wither's location for all online players
+     * Updates Wither location for all online players
      */
     private void teleport() {
         for (TabPlayer p : TAB.getInstance().getOnlinePlayers()) {
             if (p.getVersion().getMinorVersion() > 8) continue; //sending VV packets to those
             for (BossBar line : getRegisteredBossBars().values()) {
                 if (!line.containsPlayer(p)) continue;
-                Location loc = ((Player) p.getPlayer()).getEyeLocation().add(((Player) p.getPlayer()).getEyeLocation().getDirection().normalize().multiply(WITHER_DISTANCE));
+                Location eyeLocation = ((BukkitTabPlayer)p).getPlayer().getEyeLocation();
+                Location loc = eyeLocation.add(eyeLocation.getDirection().normalize().multiply(WITHER_DISTANCE));
                 if (loc.getY() < 1) loc.setY(1);
-                p.sendCustomPacket(new PacketPlayOutEntityTeleport(line.getUniqueId().hashCode(), loc.getX(), loc.getY(), loc.getZ(), 0, 0), TabConstants.PacketCategory.BOSSBAR_WITHER_TELEPORT);
+                ((BackendTabPlayer)p).getEntityView().teleportEntity(line.getUniqueId().hashCode(), new me.neznamy.tab.shared.backend.Location(loc.getX(), loc.getY(), loc.getZ()));
             }
         }
     }
@@ -61,11 +70,24 @@ public class WitherBossBar extends BossBarManagerImpl implements Listener {
     }
     
     /**
-     * Respawning wither as respawn screen destroys all entities in client
+     * Respawning wither as respawn screen destroys all entities in client.
+     *
+     * @param   e
+     *          Respawn event
      */
     @EventHandler
     public void onRespawn(PlayerRespawnEvent e) {
-        TAB.getInstance().getCPUManager().runMeasuredTask(this, TabConstants.CpuUsageCategory.PLAYER_RESPAWN,
-                () -> detectBossBarsAndSend(TAB.getInstance().getPlayer(e.getPlayer().getUniqueId())));
+        TabPlayer player = TAB.getInstance().getPlayer(e.getPlayer().getUniqueId());
+        if (player == null) return;
+        TAB.getInstance().getCPUManager().runMeasuredTask(getFeatureName(), TabConstants.CpuUsageCategory.PLAYER_RESPAWN,
+                () -> detectBossBarsAndSend(player));
+    }
+
+    @Override
+    public void onWorldChange(@NotNull TabPlayer p, @NotNull String from, @NotNull String to) {
+        for (BossBar line : lineValues) {
+            line.removePlayer(p);
+        }
+        detectBossBarsAndSend(p);
     }
 }

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/BukkitNameTagX.java

@@ -1,202 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
-
-import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabPlayer;
-import me.neznamy.tab.platforms.bukkit.nms.datawatcher.DataWatcher;
-import me.neznamy.tab.platforms.bukkit.nms.storage.nms.NMSStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutEntityDestroyStorage;
-import me.neznamy.tab.platforms.bukkit.nms.storage.packet.PacketPlayOutEntityTeleportStorage;
-import me.neznamy.tab.shared.backend.features.unlimitedtags.BackendNameTagX;
-import org.bukkit.Bukkit;
-import org.bukkit.Location;
-import org.bukkit.entity.Entity;
-import org.bukkit.entity.EntityType;
-import org.bukkit.entity.Player;
-import org.bukkit.entity.Pose;
-import org.bukkit.event.HandlerList;
-import org.bukkit.plugin.java.JavaPlugin;
-
-import java.util.Collections;
-import java.util.List;
-import java.util.stream.Collectors;
-
-/**
- * The core class for unlimited NameTag mode on Bukkit
- */
-@RequiredArgsConstructor
-public class BukkitNameTagX extends BackendNameTagX {
-
-    /** Reference to NMS storage for quick access */
-    private final NMSStorage nms = NMSStorage.getInstance();
-
-    /** Bukkit event listener */
-    private final EventListener eventListener = new EventListener(this);
-
-    /** Plugin reference */
-    private final JavaPlugin plugin;
-
-    @Override
-    public void load() {
-        Bukkit.getPluginManager().registerEvents(eventListener, plugin);
-        super.load();
-    }
-
-    @Override
-    public boolean onPacketReceive(TabPlayer sender, Object packet) throws ReflectiveOperationException {
-        if (sender.getVersion().getMinorVersion() == 8 && nms.PacketPlayInUseEntity.isInstance(packet)) {
-            int entityId = nms.PacketPlayInUseEntity_ENTITY.getInt(packet);
-            TabPlayer attacked = null;
-            for (TabPlayer all : TabAPI.getInstance().getOnlinePlayers()) {
-                if (all.isLoaded() && getArmorStandManager(all).hasArmorStandWithID(entityId)) {
-                    attacked = all;
-                    break;
-                }
-            }
-            if (attacked != null && attacked != sender) {
-                nms.PacketPlayInUseEntity_ENTITY.set(packet, getEntityId(attacked));
-            }
-        }
-        return false;
-    }
-
-    @SuppressWarnings("unchecked")
-    @Override
-    public void onPacketSend(TabPlayer receiver, Object packet) throws ReflectiveOperationException {
-        if (receiver.getVersion().getMinorVersion() < 8) return;
-        if (!receiver.isLoaded() || isDisabledPlayer(receiver) || getDisabledUnlimitedPlayers().contains(receiver)) return;
-        if (nms.PacketPlayOutEntity.isInstance(packet) && !nms.PacketPlayOutEntityLook.isInstance(packet)) { //ignoring head rotation only packets
-            packetListener.onEntityMove(receiver, nms.PacketPlayOutEntity_ENTITYID.getInt(packet));
-        } else if (PacketPlayOutEntityTeleportStorage.CLASS.isInstance(packet)) {
-            packetListener.onEntityMove(receiver, PacketPlayOutEntityTeleportStorage.ENTITY_ID.getInt(packet));
-        } else if (nms.PacketPlayOutNamedEntitySpawn.isInstance(packet)) {
-            packetListener.onEntitySpawn(receiver, nms.PacketPlayOutNamedEntitySpawn_ENTITYID.getInt(packet));
-        } else if (PacketPlayOutEntityDestroyStorage.CLASS.isInstance(packet)) {
-            if (nms.getMinorVersion() >= 17) {
-                Object entities = PacketPlayOutEntityDestroyStorage.ENTITIES.get(packet);
-                if (entities instanceof List) {
-                    packetListener.onEntityDestroy(receiver, (List<Integer>) entities);
-                } else {
-                    //1.17.0
-                    packetListener.onEntityDestroy(receiver, (int) entities);
-                }
-            } else {
-                packetListener.onEntityDestroy(receiver, (int[]) PacketPlayOutEntityDestroyStorage.ENTITIES.get(packet));
-            }
-        }
-    }
-
-    @Override
-    public double getDistance(TabPlayer player1, TabPlayer player2) {
-        Location loc1 = ((Player) player1.getPlayer()).getLocation();
-        Location loc2 = ((Player) player2.getPlayer()).getLocation();
-        return Math.sqrt(Math.pow(loc1.getX()-loc2.getX(), 2) + Math.pow(loc1.getZ()-loc2.getZ(), 2));
-    }
-
-    @Override
-    public boolean areInSameWorld(TabPlayer player1, TabPlayer player2) {
-        return ((Player) player1.getPlayer()).getWorld() == ((Player) player1.getPlayer()).getWorld();
-    }
-
-    @Override
-    public boolean canSee(TabPlayer viewer, TabPlayer target) {
-        return ((Player)viewer.getPlayer()).canSee((Player)target.getPlayer());
-    }
-
-    @Override
-    public void unregisterListener() {
-        HandlerList.unregisterAll(eventListener);
-    }
-
-    @SuppressWarnings("deprecation")
-    @Override
-    public List<Integer> getPassengers(Object entity) {
-        Entity vehicle = (Entity) entity;
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 11) {
-            return vehicle.getPassengers().stream().map(Entity::getEntityId).collect(Collectors.toList());
-        } else {
-            if (vehicle.getPassenger() != null) {
-                return Collections.singletonList(vehicle.getPassenger().getEntityId());
-            } else {
-                return Collections.emptyList();
-            }
-        }
-    }
-
-    @Override
-    public void registerVehiclePlaceholder() {
-        TabAPI.getInstance().getPlaceholderManager().registerPlayerPlaceholder(TabConstants.Placeholder.VEHICLE, 100, p -> {
-            Entity v = ((Player)p.getPlayer()).getVehicle();
-            //There's a bug in Bukkit 1.19.3 throwing NPE on .toString(), use default toString implementation
-            return v == null ? "" : v.getClass().getName() + "@" + Integer.toHexString(v.hashCode());
-        });
-    }
-
-    @Override
-    public Object getVehicle(TabPlayer player) {
-        return ((Player)player.getPlayer()).getVehicle();
-    }
-
-    @Override
-    public int getEntityId(Object entity) {
-        return ((Entity)entity).getEntityId();
-    }
-
-    @Override
-    public String getEntityType(Object entity) {
-        return ((Entity) entity).getType().toString().toLowerCase();
-    }
-
-    @Override
-    public boolean isSneaking(TabPlayer player) {
-        return ((Player)player.getPlayer()).isSneaking();
-    }
-
-    @Override
-    public boolean isSwimming(TabPlayer player) {
-        Player p = (Player) player.getPlayer();
-        if (TabAPI.getInstance().getServerVersion().getMinorVersion() >= 14 && p.getPose() == Pose.SWIMMING) return true;
-        return TabAPI.getInstance().getServerVersion().getMinorVersion() == 13 && p.isSwimming();
-    }
-
-    @Override
-    public boolean isGliding(TabPlayer player) {
-        return TabAPI.getInstance().getServerVersion().getMinorVersion() >= 9 && ((Player)player.getPlayer()).isGliding();
-    }
-
-    @Override
-    public boolean isSleeping(TabPlayer player) {
-        return ((Player)player.getPlayer()).isSleeping();
-    }
-
-    @Override
-    public Object getArmorStandType() {
-        return EntityType.ARMOR_STAND;
-    }
-
-    @Override
-    public double getX(TabPlayer player) {
-        return ((Player)player.getPlayer()).getLocation().getX();
-    }
-
-    @Override
-    public double getY(Object entity) {
-        return ((Entity)entity).getLocation().getY();
-    }
-
-    @Override
-    public double getZ(TabPlayer player) {
-        return ((Player)player.getPlayer()).getLocation().getZ();
-    }
-
-    @Override
-    public Object createDataWatcher(TabPlayer viewer, byte flags, String displayName, boolean nameVisible, boolean markerFlag) {
-        DataWatcher datawatcher = new DataWatcher();
-        datawatcher.getHelper().setEntityFlags(flags);
-        datawatcher.getHelper().setCustomName(displayName, viewer.getVersion());
-        datawatcher.getHelper().setCustomNameVisible(nameVisible);
-        if (markerFlag) datawatcher.getHelper().setArmorStandFlags((byte)16);
-        return datawatcher;
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/features/unlimitedtags/EventListener.java

@@ -1,50 +0,0 @@
-package me.neznamy.tab.platforms.bukkit.features.unlimitedtags;
-
-import lombok.RequiredArgsConstructor;
-import me.neznamy.tab.api.TabAPI;
-import me.neznamy.tab.api.TabConstants;
-import me.neznamy.tab.api.TabPlayer;
-import org.bukkit.event.EventHandler;
-import org.bukkit.event.EventPriority;
-import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerRespawnEvent;
-import org.bukkit.event.player.PlayerToggleSneakEvent;
-
-/**
- * Class listening to Bukkit events which the feature requires and are
- * sufficient, without packets being requires.
- */
-@RequiredArgsConstructor
-public class EventListener implements Listener {
-
-    /** Reference to the main feature */
-    private final BukkitNameTagX feature;
-
-    /**
-     * Sneak event listener to de-spawn and spawn armor stands to skip animation
-     *
-     * @param   e
-     *          sneak event
-     */
-    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
-    public void onSneak(PlayerToggleSneakEvent e) {
-        TabPlayer p = TabAPI.getInstance().getPlayer(e.getPlayer().getUniqueId());
-        if (p == null || feature.isPlayerDisabled(p)) return;
-        TabAPI.getInstance().getThreadManager().runMeasuredTask(feature, TabConstants.CpuUsageCategory.PLAYER_SNEAK, () -> feature.getArmorStandManager(p).sneak(e.isSneaking()));
-    }
-
-    /**
-     * Respawning armor stands as respawn screen destroys all entities in client
-     *
-     * @param   e
-     *          respawn event
-     */
-    @EventHandler
-    public void onRespawn(PlayerRespawnEvent e) {
-        TabAPI.getInstance().getThreadManager().runMeasuredTask(feature, TabConstants.CpuUsageCategory.PLAYER_RESPAWN, () -> {
-            TabPlayer respawned = TabAPI.getInstance().getPlayer(e.getPlayer().getUniqueId());
-            if (feature.isPlayerDisabled(respawned)) return;
-            feature.getArmorStandManager(respawned).teleport();
-        });
-    }
-}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/hook/BukkitPremiumVanishHook.java

@@ -0,0 +1,23 @@
+package me.neznamy.tab.platforms.bukkit.hook;
+
+import de.myzelyam.api.vanish.VanishAPI;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.shared.hook.PremiumVanishHook;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * PremiumVanish hook for Bukkit.
+ */
+public class BukkitPremiumVanishHook extends PremiumVanishHook {
+
+    @Override
+    public boolean canSee(@NotNull TabPlayer viewer, @NotNull TabPlayer target) {
+        return VanishAPI.canSee(((BukkitTabPlayer)viewer).getPlayer(), ((BukkitTabPlayer)target).getPlayer());
+    }
+
+    @Override
+    public boolean isVanished(@NotNull TabPlayer player) {
+        return VanishAPI.isInvisible(((BukkitTabPlayer)player).getPlayer());
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/hook/LibsDisguisesHook.java

@@ -0,0 +1,33 @@
+package me.neznamy.tab.platforms.bukkit.hook;
+
+import me.libraryaddict.disguise.DisguiseAPI;
+import me.neznamy.tab.platforms.bukkit.BukkitTabPlayer;
+import me.neznamy.tab.shared.platform.TabPlayer;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+
+/**
+ * Class for hooking into LibsDisguises to get disguise status of players.
+ */
+public class LibsDisguisesHook {
+
+    /** Flag tracking if LibsDisguises is installed or not */
+    private static boolean installed = ReflectionUtils.classExists("me.libraryaddict.disguise.DisguiseAPI");
+
+    /**
+     * Returns {@code true} if LibsDisguises is installed and player is disguised,
+     * {@code false} otherwise.
+     *
+     * @param   player
+     *          Player to check
+     * @return  {@code true} if disguised, {@code false} otherwise
+     */
+    public static boolean isDisguised(TabPlayer player) {
+        try {
+            return installed && DisguiseAPI.isDisguised(((BukkitTabPlayer)player).getPlayer());
+        } catch (LinkageError e) {
+            //java.lang.NoClassDefFoundError: Could not initialize class me.libraryaddict.disguise.DisguiseAPI
+            installed = false;
+            return false;
+        }
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/BukkitReflection.java

@@ -0,0 +1,113 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.SneakyThrows;
+import me.neznamy.tab.shared.util.FunctionWithException;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+import org.bukkit.Bukkit;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Arrays;
+
+/**
+ * Class containing main NMS-related information and methods.
+ */
+public class BukkitReflection {
+
+    /** CraftBukkit package */
+    private static final String CRAFTBUKKIT_PACKAGE = Bukkit.getServer().getClass().getPackage().getName();
+
+    /** Server version data */
+    private static final ServerVersion serverVersion = detectServerVersion();
+
+    /** Flag determining whether the server version is at least 1.19.3 or not */
+    @Getter
+    private static final boolean is1_19_3Plus = ReflectionUtils.classExists("net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket");
+
+    /** Flag determining whether the server version is at least 1.19.4 or not */
+    @Getter
+    private static final boolean is1_19_4Plus = ReflectionUtils.classExists("net.minecraft.network.protocol.game.ClientboundBundlePacket");
+
+    /** Flag determining whether the server version is at least 1.20.2 or not */
+    @Getter
+    private static final boolean is1_20_2Plus = ReflectionUtils.classExists("net.minecraft.world.scores.DisplaySlot");
+
+    /** Flag determining whether the server version is at least 1.20.3 or not */
+    @Getter
+    private static final boolean is1_20_3Plus = ReflectionUtils.classExists("net.minecraft.network.protocol.game.ClientboundResetScorePacket");
+
+    private static ServerVersion detectServerVersion() {
+        FunctionWithException<String, Class<?>> classFunction = name -> Class.forName("net.minecraft." + name);
+        String[] array = Bukkit.getServer().getClass().getPackage().getName().split("\\.");
+        int minorVersion;
+        if (array.length > 3) {
+            // Normal packaging
+            String serverPackage = array[3];
+            minorVersion = Integer.parseInt(serverPackage.split("_")[1]);
+            if (minorVersion < 17) {
+                ClassLoader loader = BukkitReflection.class.getClassLoader();
+                classFunction = name -> loader.loadClass("net.minecraft.server." + serverPackage + "." + name);
+            }
+        } else {
+            // Paper without CB relocation
+            minorVersion = Integer.parseInt(Bukkit.getBukkitVersion().split("-")[0].split("\\.")[1]);
+        }
+        return new ServerVersion(classFunction, minorVersion);
+    }
+
+    /**
+     * Returns server's minor version, such as 20 for 1.20.4
+     *
+     * @return  server's minor version
+     */
+    public static int getMinorVersion() {
+        return serverVersion.getMinorVersion();
+    }
+
+    /**
+     * Returns class with given potential names in same order. For 1.17+ it takes packaged class names
+     * without "net.minecraft." prefix, for <1.17 it takes class name only.
+     *
+     * @param   names
+     *          possible class names
+     * @return  class for specified names
+     * @throws  ClassNotFoundException
+     *          if class does not exist
+     */
+    @SneakyThrows
+    public static Class<?> getClass(@NotNull String... names) throws ClassNotFoundException {
+        for (String name : names) {
+            try {
+                return serverVersion.getClass.apply(name);
+            } catch (ClassNotFoundException | NullPointerException ignored) {
+                // not the first class name in array
+            }
+        }
+        throw new ClassNotFoundException("No class found with possible names " + Arrays.toString(names));
+    }
+
+    /**
+     * Returns CraftBukkit class with given package and name.
+     *
+     * @param   name
+     *          Package and name of the class
+     * @return  CraftBukkit class
+     * @throws  ClassNotFoundException
+     *          If class does not exist
+     */
+    public static Class<?> getBukkitClass(@NotNull String name) throws ClassNotFoundException {
+        return Class.forName(CRAFTBUKKIT_PACKAGE + "." + name);
+    }
+
+    /**
+     * Class with server version information.
+     */
+    @RequiredArgsConstructor
+    @Getter
+    private static class ServerVersion {
+
+        private final FunctionWithException<String, Class<?>> getClass;
+        private final int minorVersion;
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/ComponentConverter.java

@@ -0,0 +1,161 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import lombok.SneakyThrows;
+import me.neznamy.tab.shared.chat.ChatModifier;
+import me.neznamy.tab.shared.chat.SimpleComponent;
+import me.neznamy.tab.shared.chat.StructuredComponent;
+import me.neznamy.tab.shared.chat.TabComponent;
+import me.neznamy.tab.shared.util.FunctionWithException;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.List;
+import java.util.function.BiFunction;
+
+/**
+ * Class for converting TAB component into NMS components (1.7+).
+ */
+@SuppressWarnings({"rawtypes", "unchecked"})
+public class ComponentConverter {
+
+    /** Instance of the class */
+    @Nullable
+    public static ComponentConverter INSTANCE;
+
+    private final FunctionWithException<String, Object> newTextComponent;
+    private final BiFunction<ChatModifier, Boolean, Object> convertModifier;
+
+    private final Class<?> ChatModifier = BukkitReflection.getClass("network.chat.ChatModifier", "ChatModifier");
+    private final Class<Enum> EnumChatFormat = (Class<Enum>) BukkitReflection.getClass("EnumChatFormat");
+    private final Constructor<?> newChatModifier;
+    private final Method ChatBaseComponent_addSibling;
+    private final Field Component_modifier;
+    private final List<Field> magicCodes = ReflectionUtils.getFields(ChatModifier, Boolean.class);
+
+    // 1.15-
+    private Method ChatModifier_setColor;
+
+    // 1.16+
+    private Method ChatHexColor_fromRGB;
+    private Constructor<?> newMinecraftKey;
+
+    /**
+     * Constructs new instance and loads all NMS classes, constructors and methods.
+     *
+     * @throws  ReflectiveOperationException
+     *          If something failed
+     */
+    private ComponentConverter() throws ReflectiveOperationException {
+        Class<?> IChatBaseComponent = BukkitReflection.getClass("network.chat.IChatBaseComponent", "IChatBaseComponent");
+        if (BukkitReflection.getMinorVersion() >= 19) {
+            Method IChatBaseComponent_b = ReflectionUtils.getMethod(IChatBaseComponent, new String[] {"b", "literal"}, String.class);
+            newTextComponent = text -> IChatBaseComponent_b.invoke(null, text);
+            Class<?> IChatMutableComponent = BukkitReflection.getClass("network.chat.IChatMutableComponent", "IChatMutableComponent");
+            Component_modifier = ReflectionUtils.getOnlyField(IChatMutableComponent, ChatModifier);
+            ChatBaseComponent_addSibling = ReflectionUtils.getOnlyMethod(IChatMutableComponent, IChatMutableComponent, IChatBaseComponent);
+        } else {
+            Class<?> ChatComponentText = BukkitReflection.getClass("network.chat.ChatComponentText", "ChatComponentText");
+            Constructor<?> newChatComponentText = ChatComponentText.getConstructor(String.class);
+            newTextComponent = newChatComponentText::newInstance;
+            Class<?> ChatBaseComponent = BukkitReflection.getClass("network.chat.ChatBaseComponent", "ChatBaseComponent");
+            Component_modifier = ReflectionUtils.getOnlyField(ChatBaseComponent, ChatModifier);
+            ChatBaseComponent_addSibling = ReflectionUtils.getOnlyMethod(ChatComponentText, IChatBaseComponent, IChatBaseComponent);
+        }
+        if (BukkitReflection.getMinorVersion() >= 16) {
+            Class<?> chatHexColor = BukkitReflection.getClass("network.chat.ChatHexColor", "ChatHexColor");
+            Class<?> MinecraftKey = BukkitReflection.getClass("resources.MinecraftKey", "MinecraftKey");
+            Class<?> chatClickable = BukkitReflection.getClass("network.chat.ChatClickable", "ChatClickable");
+            Class<?> chatHoverable = BukkitReflection.getClass("network.chat.ChatHoverable", "ChatHoverable");
+            newMinecraftKey = MinecraftKey.getConstructor(String.class);
+            ChatHexColor_fromRGB = ReflectionUtils.getOnlyMethod(chatHexColor, chatHexColor, int.class);
+            newChatModifier = ReflectionUtils.setAccessible(ChatModifier.getDeclaredConstructor(chatHexColor, Boolean.class, Boolean.class, Boolean.class,
+                    Boolean.class, Boolean.class, chatClickable, chatHoverable, String.class, MinecraftKey));
+            convertModifier = this::createModifierModern;
+        } else {
+            newChatModifier = ChatModifier.getConstructor();
+            ChatModifier_setColor = ReflectionUtils.getOnlyMethod(ChatModifier, ChatModifier, EnumChatFormat);
+            convertModifier = (modifier, protocolVersion) -> createModifierLegacy(modifier);
+        }
+    }
+
+    /**
+     * Converts TAB component to NMS component.
+     *
+     * @param   component
+     *          Component to convert
+     * @param   modern
+     *          Whether client supports RGB or not
+     * @return  Converted component
+     */
+    @SneakyThrows
+    public Object convert(@NotNull TabComponent component, boolean modern) {
+        if (component instanceof SimpleComponent) return newTextComponent.apply(((SimpleComponent) component).getText());
+
+        StructuredComponent component1 = (StructuredComponent) component;
+        Object nmsComponent = newTextComponent.apply(component1.getText());
+        Component_modifier.set(nmsComponent, convertModifier.apply(component1.getModifier(), modern));
+        for (StructuredComponent extra : component1.getExtra()) {
+            ChatBaseComponent_addSibling.invoke(nmsComponent, convert(extra, modern));
+        }
+        return nmsComponent;
+    }
+
+    @SneakyThrows
+    private Object createModifierModern(@NotNull ChatModifier modifier, boolean modern) {
+        Object color = null;
+        if (modifier.getColor() != null) {
+            if (modern) {
+                color = ChatHexColor_fromRGB.invoke(null, modifier.getColor().getRgb());
+            } else {
+                color = ChatHexColor_fromRGB.invoke(null, modifier.getColor().getLegacyColor().getRgb());
+            }
+        }
+        return newChatModifier.newInstance(
+                color,
+                modifier.isBold(),
+                modifier.isItalic(),
+                modifier.isUnderlined(),
+                modifier.isStrikethrough(),
+                modifier.isObfuscated(),
+                null,
+                null,
+                null,
+                modifier.getFont() == null ? null : newMinecraftKey.newInstance(modifier.getFont())
+        );
+    }
+
+    @SneakyThrows
+    private Object createModifierLegacy(@NotNull ChatModifier modifier) {
+        Object nmsModifier = newChatModifier.newInstance();
+        if (modifier.getColor() != null) {
+            ChatModifier_setColor.invoke(nmsModifier, Enum.valueOf(EnumChatFormat, modifier.getColor().getLegacyColor().name()));
+        }
+        if (modifier.isBold()) magicCodes.get(0).set(nmsModifier, true);
+        if (modifier.isItalic()) magicCodes.get(1).set(nmsModifier, true);
+        if (modifier.isStrikethrough()) magicCodes.get(2).set(nmsModifier, true);
+        if (modifier.isUnderlined()) magicCodes.get(3).set(nmsModifier, true);
+        if (modifier.isObfuscated()) magicCodes.get(4).set(nmsModifier, true);
+        return nmsModifier;
+    }
+
+    /**
+     * Attempts to load component converter.
+     */
+    public static void tryLoad() {
+        try {
+            INSTANCE = new ComponentConverter();
+        } catch (Exception ignored) {
+        }
+    }
+
+    /**
+     * Makes sure the component converter is available and throws an exception if not.
+     */
+    public static void ensureAvailable() {
+        if (INSTANCE == null) throw new IllegalStateException("Component converter is not available");
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PacketSender.java

@@ -0,0 +1,56 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import lombok.SneakyThrows;
+import me.neznamy.tab.shared.util.BiConsumerWithException;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+/**
+ * Class for sending packets to players.
+ */
+public class PacketSender {
+
+    /** Function for sending packet */
+    @NotNull
+    private final BiConsumerWithException<Player, Object> send;
+
+    /**
+     * Constructs new instance and attempts to load required classes, fields and methods.
+     * If something fails, error is thrown.
+     *
+     * @throws  ReflectiveOperationException
+     *          If something fails
+     */
+    public PacketSender() throws ReflectiveOperationException {
+        Class<?> Packet = BukkitReflection.getClass("network.protocol.Packet", "Packet");
+        Class<?> EntityPlayer = BukkitReflection.getClass("server.level.ServerPlayer", "server.level.EntityPlayer", "EntityPlayer");
+        Class<?> PlayerConnection = BukkitReflection.getClass("server.network.ServerGamePacketListenerImpl", "server.network.PlayerConnection", "PlayerConnection");
+        Method getHandle = BukkitReflection.getBukkitClass("entity.CraftPlayer").getMethod("getHandle");
+        Field PLAYER_CONNECTION = ReflectionUtils.getOnlyField(EntityPlayer, PlayerConnection);
+        Method sendPacket;
+        if (BukkitReflection.getMinorVersion() >= 7) {
+            sendPacket = ReflectionUtils.getMethods(PlayerConnection, void.class, Packet).get(0);
+        } else {
+            sendPacket = ReflectionUtils.getMethod(PlayerConnection, new String[]{"sendPacket"}, Packet);
+        }
+        send = (player, packet) -> sendPacket.invoke(PLAYER_CONNECTION.get(getHandle.invoke(player)), packet);
+    }
+
+    /**
+     * Sends packet to specified player.
+     * If something goes wrong, throws an exception.
+     *
+     * @param   player
+     *          Player to send packet to
+     * @param   packet
+     *          Packet to send
+     */
+    @SneakyThrows
+    public void sendPacket(@NotNull Player player, @NotNull Object packet) {
+        send.accept(player, packet);
+    }
+}

bukkit/src/main/java/me/neznamy/tab/platforms/bukkit/nms/PingRetriever.java

@@ -0,0 +1,54 @@
+package me.neznamy.tab.platforms.bukkit.nms;
+
+import lombok.SneakyThrows;
+import me.neznamy.tab.platforms.bukkit.BukkitUtils;
+import me.neznamy.tab.shared.util.FunctionWithException;
+import me.neznamy.tab.shared.util.ReflectionUtils;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+
+/**
+ * Class for retrieving ping of players.
+ */
+public class PingRetriever {
+
+    /** Ping getter function */
+    private static FunctionWithException<Player, Integer> getPing;
+
+    /**
+     * Attempts to load required classes, fields and methods and marks class as available.
+     * If something fails, error message is printed and class is not marked as available.
+     */
+    public static void tryLoad() {
+        try {
+            if (BukkitReflection.getMinorVersion() >= 17) {
+                getPing = Player::getPing;
+            } else {
+                Method getHandle = BukkitReflection.getBukkitClass("entity.CraftPlayer").getMethod("getHandle");
+                Class<?> EntityPlayer = BukkitReflection.getClass("server.level.ServerPlayer", "server.level.EntityPlayer", "EntityPlayer");
+                Field PING = ReflectionUtils.getField(EntityPlayer, "ping", "field_71138_i"); // 1.5.2 - 1.16.5, 1.7.10 Thermos
+                getPing = player -> PING.getInt(getHandle.invoke(player));
+            }
+        } catch (Exception e) {
+            getPing = p -> -1;
+            BukkitUtils.compatibilityError(e, "getting player's ping", null, "%ping% returning -1");
+        }
+    }
+
+    /**
+     * Returns player's ping. If ping getter is not available and fields
+     * failed to load, returns {@code -1}. If an exception was throws by
+     * reflective operation, it is re-thrown.
+     *
+     * @param   player
+     *          Player to get ping of
+     * @return  Player's ping or {@code -1} if it failed
+     */
+    @SneakyThrows
+    public static int getPing(@NotNull Player player) {
+        return getPing.apply(player);
+    }
+}