Merge pull request #52 from MrMicky-FR/master

Add 1.15 support and cleanup some code

.travis.yml

@@ -17,5 +17,6 @@ install:
   - ls $HOME/.m2/repository/org/spigotmc/spigot/1.13-R0.1-SNAPSHOT >> /dev/null 2>&1 || java -jar BuildTools.jar --rev 1.13 >> /dev/null 2>&1
   - ls $HOME/.m2/repository/org/spigotmc/spigot/1.13.2-R0.1-SNAPSHOT >> /dev/null 2>&1 || java -jar BuildTools.jar --rev 1.13.2 >> /dev/null 2>&1
   - ls $HOME/.m2/repository/org/spigotmc/spigot/1.14.4-R0.1-SNAPSHOT >> /dev/null 2>&1 || java -jar BuildTools.jar --rev 1.14.4 >> /dev/null 2>&1
+  - ls $HOME/.m2/repository/org/spigotmc/spigot/1.15.2-R0.1-SNAPSHOT >> /dev/null 2>&1 || java -jar BuildTools.jar --rev 1.15.2 >> /dev/null 2>&1
 script:
   - mvn clean install

api/src/main/java/com/comphenix/tinyprotocol/TinyProtocol.java

@@ -6,6 +6,7 @@ package com.comphenix.tinyprotocol;
 
 import com.google.common.collect.Lists;
 import com.google.common.collect.MapMaker;
+import com.mojang.authlib.GameProfile;
 import io.netty.channel.*;
 import net.jitse.npclib.NPCLib;
 import org.bukkit.Bukkit;
@@ -26,7 +27,6 @@ import java.util.concurrent.atomic.AtomicInteger;
  * Minimized version of TinyProtocol by Kristian suited for NPCLib.
  */
 public abstract class TinyProtocol {
-
     private static final AtomicInteger ID = new AtomicInteger(0);
 
     // Used in order to lookup a channel
@@ -44,8 +44,7 @@ public abstract class TinyProtocol {
 
     // Packets we have to intercept
     private static final Class<?> PACKET_LOGIN_IN_START = Reflection.getMinecraftClass("PacketLoginInStart");
-    private static final Reflection.FieldAccessor getGameProfile = Reflection.getField(PACKET_LOGIN_IN_START,
+    private static final Reflection.FieldAccessor<GameProfile> getGameProfile = Reflection.getField(PACKET_LOGIN_IN_START, GameProfile.class, 0);
-            Reflection.getClass("com.mojang.authlib.GameProfile"), 0);
 
     // Speedup channel lookup
     private Map<String, Channel> channelLookup = new MapMaker().weakValues().makeMap();
@@ -85,7 +84,7 @@ public abstract class TinyProtocol {
             instance.getLogger().info("Attempting to inject into netty");
             registerChannelHandler();
             registerPlayers(plugin);
-        } catch (IllegalArgumentException exception) {
+        } catch (IllegalArgumentException ex) {
             // Damn you, late bind
             instance.getLogger().warning("Attempting to delay injection");
 
@@ -115,9 +114,8 @@ public abstract class TinyProtocol {
                             channel.eventLoop().submit(() -> injectChannelInternal(channel));
                         }
                     }
-                } catch (Exception exception) {
+                } catch (Exception e) {
-                    instance.getLogger().severe("Cannot inject incomming channel " + channel + ". Message: "
+                    instance.getLogger().severe("Cannot inject incomming channel " + channel, e);
-                            + exception.getMessage());
                 }
             }
 
@@ -126,9 +124,8 @@ public abstract class TinyProtocol {
         // This is executed before Minecraft's channel handler
         beginInitProtocol = new ChannelInitializer<Channel>() {
 
-            @SuppressWarnings("all")
             @Override
-            protected void initChannel(Channel channel) throws Exception {
+            protected void initChannel(Channel channel) {
                 channel.pipeline().addLast(endInitProtocol);
             }
 
@@ -136,9 +133,8 @@ public abstract class TinyProtocol {
 
         serverChannelHandler = new ChannelInboundHandlerAdapter() {
 
-            @SuppressWarnings("all")
             @Override
-            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+            public void channelRead(ChannelHandlerContext ctx, Object msg) {
                 Channel channel = (Channel) msg;
 
                 // Prepare to initialize ths channel
@@ -152,7 +148,6 @@ public abstract class TinyProtocol {
     private void registerBukkitEvents() {
         listener = new Listener() {
 
-            @SuppressWarnings("unused")
             @EventHandler(priority = EventPriority.LOWEST)
             public final void onPlayerLogin(PlayerLoginEvent e) {
                 if (closed)
@@ -166,7 +161,6 @@ public abstract class TinyProtocol {
                 }
             }
 
-            @SuppressWarnings("unused")
             @EventHandler
             public final void onPluginDisable(PluginDisableEvent e) {
                 if (e.getPlugin().equals(plugin)) {
@@ -251,7 +245,7 @@ public abstract class TinyProtocol {
             }
 
             return interceptor;
-        } catch (IllegalArgumentException exception) {
+        } catch (IllegalArgumentException e) {
             // Try again
             return (PacketInterceptor) channel.pipeline().get(handlerName);
         }
@@ -305,8 +299,8 @@ public abstract class TinyProtocol {
 
             try {
                 msg = onPacketInAsync(player, msg);
-            } catch (Exception exception) {
+            } catch (Exception e) {
-                instance.getLogger().severe("Error in onPacketInAsync(). Message: " + exception.getMessage());
+                instance.getLogger().severe("Error in onPacketInAsync().", e);
             }
 
             if (msg != null) {
@@ -316,8 +310,8 @@ public abstract class TinyProtocol {
 
         private void handleLoginStart(Channel channel, Object packet) {
             if (PACKET_LOGIN_IN_START.isInstance(packet)) {
-                Object profile = getGameProfile.get(packet);
+                GameProfile profile = getGameProfile.get(packet);
-                channelLookup.put((String) Reflection.getMethod(profile.getClass(), "getName").invoke(profile), channel);
+                channelLookup.put(profile.getName(), channel);
             }
         }
     }

api/src/main/java/net/jitse/npclib/NPCLib.java

@@ -39,8 +39,7 @@ public final class NPCLib {
         this.npcClass = npcClass;
 
         if (npcClass == null) {
-            logger.severe("Failed to initiate. Your server's version ("
+            logger.severe("Failed to initiate. Your server's version (" + versionName + ") is not supported");
-                    + versionName + ") is not supported");
             return;
         }
 
@@ -96,7 +95,7 @@ public final class NPCLib {
         try {
             return (NPC) npcClass.getConstructors()[0].newInstance(this, text);
         } catch (Exception exception) {
-            logger.warning("Failed to create NPC. Please report the following stacktrace message: " + exception.getMessage());
+            logger.warning("Failed to create NPC. Please report the following stacktrace message", exception);
         }
 
         return null;

api/src/main/java/net/jitse/npclib/api/events/NPCHideEvent.java

@@ -54,6 +54,7 @@ public class NPCHideEvent extends Event implements Cancellable {
         return cancelled;
     }
 
+    @Override
     public HandlerList getHandlers() {
         return handlers;
     }

api/src/main/java/net/jitse/npclib/api/events/NPCInteractEvent.java

@@ -38,6 +38,7 @@ public class NPCInteractEvent extends Event {
         return this.npc;
     }
 
+    @Override
     public HandlerList getHandlers() {
         return handlers;
     }

api/src/main/java/net/jitse/npclib/api/events/NPCShowEvent.java

@@ -54,6 +54,7 @@ public class NPCShowEvent extends Event implements Cancellable {
         return cancelled;
     }
 
+    @Override
     public HandlerList getHandlers() {
         return handlers;
     }

api/src/main/java/net/jitse/npclib/api/skin/MineSkinFetcher.java

@@ -7,12 +7,13 @@ package net.jitse.npclib.api.skin;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import org.bukkit.Bukkit;
-import org.bukkit.ChatColor;
 
 import java.io.IOException;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.Scanner;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 /**
  * @author Jitse Boonstra
@@ -20,10 +21,10 @@ import java.util.Scanner;
 public class MineSkinFetcher {
 
     private static final String MINESKIN_API = "https://api.mineskin.org/get/id/";
-    private static final ExecutorService threadPool = Executors.newSingleThreadExecutor();
+    private static final ExecutorService EXECUTOR = Executors.newSingleThreadExecutor();
 
     public static void fetchSkinFromIdAsync(int id, Callback callback) {
-        threadPool.execute(() -> {
+        EXECUTOR.execute(() -> {
             try {
                 StringBuilder builder = new StringBuilder();
                 HttpURLConnection httpURLConnection = (HttpURLConnection) new URL(MINESKIN_API + id).openConnection();
@@ -47,7 +48,7 @@ public class MineSkinFetcher {
 
                 callback.call(new Skin(value, signature));
             } catch (IOException exception) {
-                Bukkit.getConsoleSender().sendMessage(ChatColor.RED + "Could not fetch skin! (Id: " + id + "). Message: " + exception.getMessage());
+                Bukkit.getLogger().severe("Could not fetch skin! (Id: " + id + "). Message: " + exception.getMessage());
                 exception.printStackTrace();
                 callback.failed();
             }

api/src/main/java/net/jitse/npclib/api/state/NPCSlot.java

@@ -2,20 +2,30 @@ package net.jitse.npclib.api.state;
 
 public enum NPCSlot {
 
-    HELMET(4),
+    HELMET(4, "HEAD"),
-    CHESTPLATE(3),
+    CHESTPLATE(3, "CHEST"),
-    LEGGINGS(2),
+    LEGGINGS(2, "LEGS"),
-    BOOTS(1),
+    BOOTS(1, "FEET"),
-    MAINHAND(0),
+    MAINHAND(0, "MAINHAND"),
-    OFFHAND(5);
+    OFFHAND(5, "OFFHAND");
 
-    int slot;
+    private final int slot;
+    private final String nmsName;
 
-    NPCSlot(int slot) {
+    NPCSlot(int slot, String nmsName) {
         this.slot = slot;
+        this.nmsName = nmsName;
     }
 
     public int getSlot() {
         return slot;
     }
+
+    public String getNmsName() {
+        return nmsName;
+    }
+
+    public <E extends Enum<E>> E getNmsEnum(Class<E> nmsEnumClass) {
+        return Enum.valueOf(nmsEnumClass, this.nmsName);
+    }
 }

api/src/main/java/net/jitse/npclib/api/state/NPCState.java

@@ -1,12 +1,14 @@
 package net.jitse.npclib.api.state;
 
+import java.util.Collection;
+
 public enum NPCState {
 
     ON_FIRE((byte) 1),
     CROUCHED((byte) 2),
     INVISIBLE((byte) 32);
 
-    private byte b;
+    private final byte b;
 
     NPCState(byte b) {
         this.b = b;
@@ -16,10 +18,15 @@ public enum NPCState {
         return b;
     }
 
-    public static byte getMasked(final NPCState... status) {
+    public static byte getMasked(NPCState... states) {
-        byte b = 0;
+        byte mask = 0;
-        for (NPCState s : status) b |= s.getByte();
+        for (NPCState state : states) mask |= state.getByte();
-        return b;
+        return mask;
-    }
     }
 
+    public static byte getMasked(Collection<NPCState> states) {
+        byte mask = 0;
+        for (NPCState state : states) mask |= state.getByte();
+        return mask;
+    }
+}

api/src/main/java/net/jitse/npclib/api/utilities/Logger.java

@@ -6,6 +6,8 @@ package net.jitse.npclib.api.utilities;
 
 import org.bukkit.Bukkit;
 
+import java.util.logging.Level;
+
 public class Logger {
 
     private final String prefix;
@@ -21,26 +23,34 @@ public class Logger {
     }
 
     public void info(String info) {
-        if (!enabled) {
+        log(Level.INFO, info);
-            return;
-        }
-
-        Bukkit.getLogger().info(prefix + info);
     }
 
     public void warning(String warning) {
-        if (!enabled) {
+        log(Level.WARNING, warning);
-            return;
     }
 
-        Bukkit.getLogger().warning(prefix + warning);
+    public void warning(String warning, Throwable throwable) {
+        log(Level.WARNING, warning, throwable);
     }
 
     public void severe(String severe) {
-        if (!enabled) {
+        log(Level.SEVERE, severe);
-            return;
     }
 
-        Bukkit.getLogger().severe(prefix + severe);
+    public void severe(String severe, Throwable throwable) {
+        log(Level.SEVERE, severe, throwable);
+    }
+
+    public void log(Level level, String message) {
+        if (enabled) {
+            Bukkit.getLogger().log(level, prefix + message);
+        }
+    }
+
+    public void log(Level level, String message, Throwable throwable) {
+        if (enabled) {
+            Bukkit.getLogger().log(level, prefix + message, throwable);
+        }
     }
 }

api/src/main/java/net/jitse/npclib/hologram/Hologram.java

@@ -51,7 +51,7 @@ public class Hologram {
             .getConstructor(PACKET_PLAY_OUT_ENTITY_METADATA_CLAZZ, int.class, DATAWATCHER_CLAZZ, boolean.class);
 
     // Fields:
-    private static final Reflection.FieldAccessor playerConnectionField = Reflection.getField(ENTITY_PLAYER_CLAZZ,
+    private static final Reflection.FieldAccessor<?> playerConnectionField = Reflection.getField(ENTITY_PLAYER_CLAZZ,
             "playerConnection", PLAYER_CONNECTION_CLAZZ);
 
     // Methods:
@@ -92,8 +92,7 @@ public class Hologram {
     }
 
     private void createPackets() {
-        // TODO: Check when this method was changed (1.9 R2 is giving an exception...)
+        Reflection.MethodInvoker gravityMethod = (version.isAboveOrEqual(MinecraftVersion.V1_10_R1) ?
-        Reflection.MethodInvoker gravityMethod = (version.isAboveOrEqual(MinecraftVersion.V1_9_R2) ?
                 Reflection.getMethod(ENTITY_CLAZZ, "setNoGravity", boolean.class) :
                 Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ, "setGravity", boolean.class));
 
@@ -213,4 +212,3 @@ public class Hologram {
         }
     }
 }
-

api/src/main/java/net/jitse/npclib/internal/MinecraftVersion.java

@@ -6,8 +6,17 @@ package net.jitse.npclib.internal;
 
 public enum MinecraftVersion {
 
-    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_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;
 
     public boolean isAboveOrEqual(MinecraftVersion compare) {
         return ordinal() >= compare.ordinal();

api/src/main/java/net/jitse/npclib/internal/NPCBase.java

@@ -29,12 +29,13 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
     protected final int entityId = Integer.MAX_VALUE - NPCManager.getAllNPCs().size();
     protected final String name = uuid.toString().replace("-", "").substring(0, 10);
     protected final GameProfile gameProfile = new GameProfile(uuid, name);
+    protected final Set<UUID> hasTeamRegistered = new HashSet<>();
+    protected final Set<NPCState> activeStates = EnumSet.noneOf(NPCState.class);
 
     private final Set<UUID> shown = new HashSet<>();
     private final Set<UUID> autoHidden = new HashSet<>();
 
     protected double cosFOV = Math.cos(Math.toRadians(60));
-    protected NPCState[] activeStates = new NPCState[]{};
 
     protected NPCLib instance;
     protected List<String> text;
@@ -42,8 +43,7 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
     protected Skin skin;
     protected Hologram hologram;
 
-    // offHand support in 1.9 R1 and later.
+    protected final Map<NPCSlot, ItemStack> items = new EnumMap<>(NPCSlot.class);
-    protected ItemStack helmet, chestplate, leggings, boots, inHand, offHand;
 
     public NPCBase(NPCLib instance, List<String> text) {
         this.instance = instance;
@@ -136,6 +136,7 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
     public void onLogout(Player player) {
         getAutoHidden().remove(player.getUniqueId());
         getShown().remove(player.getUniqueId()); // Don't need to use NPC#hide since the entity is not registered in the NMS server.
+        hasTeamRegistered.remove(player.getUniqueId());
     }
 
     @Override
@@ -165,7 +166,7 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
             sendEquipmentPackets(player);
         } else {
             if (isShown(player)) {
-                throw new RuntimeException("Cannot call show method twice.");
+                throw new IllegalStateException("Cannot call show method twice.");
             }
 
             if (shown.contains(player.getUniqueId())) {
@@ -206,7 +207,7 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
             sendHidePackets(player);
         } else {
             if (!shown.contains(player.getUniqueId())) {
-                throw new RuntimeException("Cannot call hide method without calling NPC#show.");
+                throw new IllegalStateException("Cannot call hide method without calling NPC#show.");
             }
 
             shown.remove(player.getUniqueId());
@@ -222,47 +223,15 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
 
     @Override
     public boolean getState(NPCState state) {
-        if (activeStates.length != 0) {
+        return activeStates.contains(state);
-            for (int i = 0; i < activeStates.length; i++) {
-                if (activeStates[i] == state) {
-                    return true;
-                }
-            }
-        }
-        return false;
     }
 
     @Override
     public NPC toggleState(NPCState state) {
-        int inActiveStatesIndex = -1;
+        if (activeStates.contains(state)) {
-        if (activeStates.length == 0) { // If there're no active states, this is the first to be toggled (on).
+            activeStates.remove(state);
-            activeStates = new NPCState[]{state};
-        } else { // Otherwise, there have been states that were toggled, check if we need to toggle something off.
-            for (int i = 0; i < activeStates.length; i++) {
-                if (activeStates[i] == state) { // If the state is to be toggled off, save the index so we can remove it.
-                    inActiveStatesIndex = i;
-                    break;
-                }
-            }
-
-            if (inActiveStatesIndex > -1) { // If there's a state to be toggled of, create a new array with all items but the one to be toggled off.
-                NPCState[] newArr = new NPCState[activeStates.length - 1];
-                for (int i = 0; i < newArr.length; i++) {
-                    if (inActiveStatesIndex == i) {
-                        continue;
-                    } else if (i < inActiveStatesIndex) {
-                        newArr[i] = activeStates[i];
         } else {
-                        newArr[i] = activeStates[i + 1];
+            activeStates.add(state);
-                    }
-                }
-                activeStates = newArr;
-            } else { // Else, we need to add a state by appending our state to the array.
-                NPCState[] newArr = new NPCState[activeStates.length + 1];
-                System.arraycopy(activeStates, 0, newArr, 0, activeStates.length);
-                newArr[activeStates.length] = state;
-                activeStates = newArr;
-            }
         }
 
         // Send a new metadata packet to all players that can see the NPC.
@@ -277,55 +246,16 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
 
     @Override
     public ItemStack getItem(NPCSlot slot) {
-        if (slot == null) {
+        Objects.requireNonNull(slot, "Slot cannot be null");
-            throw new NullPointerException("Slot cannot be null");
+
-        }
+        return items.get(slot);
-        switch (slot) {
-            case HELMET:
-                return this.helmet;
-            case CHESTPLATE:
-                return this.chestplate;
-            case LEGGINGS:
-                return this.leggings;
-            case BOOTS:
-                return this.boots;
-            case MAINHAND:
-                return this.inHand;
-            case OFFHAND:
-                return this.offHand;
-            default:
-                throw new IllegalArgumentException("Entered an invalid inventory slot");
-        }
     }
 
     @Override
     public NPC setItem(NPCSlot slot, ItemStack item) {
-        if (slot == null) {
+        Objects.requireNonNull(slot, "Slot cannot be null");
-            throw new NullPointerException("Slot cannot be null");
-        }
 
-        switch (slot) {
+        items.put(slot, item);
-            case HELMET:
-                this.helmet = item;
-                break;
-            case CHESTPLATE:
-                this.chestplate = item;
-                break;
-            case LEGGINGS:
-                this.leggings = item;
-                break;
-            case BOOTS:
-                this.boots = item;
-                break;
-            case MAINHAND:
-                this.inHand = item;
-                break;
-            case OFFHAND:
-                this.offHand = item;
-                break;
-            default:
-                throw new IllegalArgumentException("Entered an invalid inventory slot");
-        }
 
         for (UUID shownUuid : shown) {
             Player player = Bukkit.getPlayer(shownUuid);

api/src/main/java/net/jitse/npclib/listeners/ChunkListener.java

@@ -60,7 +60,7 @@ public class ChunkListener implements Listener {
         Chunk chunk = event.getChunk();
 
         for (NPCBase npc : NPCManager.getAllNPCs()) {
-            if (!isSameChunk(npc.getLocation(), chunk))
+            if (npc.getLocation() == null || !isSameChunk(npc.getLocation(), chunk))
                 continue; // The NPC is not in the loaded chunk.
 
             // The chunk being loaded has this NPC in it. Showing it to all the players again.
@@ -90,7 +90,6 @@ public class ChunkListener implements Listener {
         }
     }
 
-
     private static int getChunkCoordinate(int coordinate) {
         return coordinate >> 4;
     }

api/src/main/java/net/jitse/npclib/listeners/PacketListener.java

@@ -16,7 +16,6 @@ import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 
 import java.util.HashSet;
-import java.util.Objects;
 import java.util.Set;
 import java.util.UUID;
 
@@ -29,8 +28,8 @@ public class PacketListener {
     private final Class<?> packetPlayInUseEntityClazz = Reflection.getMinecraftClass("PacketPlayInUseEntity");
 
     // Fields:
-    private final Reflection.FieldAccessor entityIdField = Reflection.getField(packetPlayInUseEntityClazz, "a", int.class);
+    private final Reflection.FieldAccessor<Integer> entityIdField = Reflection.getField(packetPlayInUseEntityClazz, "a", int.class);
-    private final Reflection.FieldAccessor actionField = Reflection.getField(packetPlayInUseEntityClazz, "action", Object.class);
+    private final Reflection.FieldAccessor<?> actionField = Reflection.getField(packetPlayInUseEntityClazz, "action", Object.class);
 
     // Prevent players from clicking at very high speeds.
     private final Set<UUID> delay = new HashSet<>();
@@ -54,7 +53,7 @@ public class PacketListener {
             return true; // We aren't handling the packet.
 
         NPCBase npc = null;
-        int packetEntityId = (int) entityIdField.get(packet);
+        int packetEntityId = entityIdField.get(packet);
 
         // Not using streams here is an intentional choice.
         // Packet listeners is one of the few places where it is important to write optimized code.
@@ -102,7 +101,7 @@ public class PacketListener {
         public void run() {
             Player player = eventToCall.getWhoClicked();
             this.listener.delay.remove(player.getUniqueId()); // Remove the NPC from the interact cooldown.
-            if (!Objects.equals(player.getWorld(), eventToCall.getNPC().getWorld()))
+            if (!player.getWorld().equals(eventToCall.getNPC().getWorld()))
                 return; // If the NPC and player are not in the same world, abort!
 
             double distance = player.getLocation(playerLocation).distanceSquared(eventToCall.getNPC().getLocation());

nms/pom.xml

@@ -24,6 +24,7 @@
         <module>v1_13_R1</module>
         <module>v1_13_R2</module>
         <module>v1_14_R1</module>
+        <module>v1_15_R1</module>
     </modules>
 
     <dependencies>

nms/v1_10_R1/src/main/java/net/jitse/npclib/nms/v1_10_R1/NPC_v1_10_R1.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_10_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_10_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_10_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_10_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_10_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_10_R1/src/main/java/net/jitse/npclib/nms/v1_10_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_10_R1.DataWatcherObject;
 import net.minecraft.server.v1_10_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_10_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_11_R1/src/main/java/net/jitse/npclib/nms/v1_11_R1/NPC_v1_11_R1.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_11_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_11_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_11_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_11_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_11_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_11_R1/src/main/java/net/jitse/npclib/nms/v1_11_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_11_R1.DataWatcherObject;
 import net.minecraft.server.v1_11_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_11_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_12_R1/src/main/java/net/jitse/npclib/nms/v1_12_R1/NPC_v1_12_R1.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_12_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_12_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_12_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_12_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_12_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_12_R1/src/main/java/net/jitse/npclib/nms/v1_12_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_12_R1.DataWatcherObject;
 import net.minecraft.server.v1_12_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_12_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_13_R1/src/main/java/net/jitse/npclib/nms/v1_13_R1/NPC_v1_13_R1.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_13_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_13_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_13_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_13_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_13_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_13_R1/src/main/java/net/jitse/npclib/nms/v1_13_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_13_R1.DataWatcherObject;
 import net.minecraft.server.v1_13_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_13_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_13_R2/src/main/java/net/jitse/npclib/nms/v1_13_R2/NPC_v1_13_R2.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_13_R2.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_13_R2 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_13_R2(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_13_R2 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_13_R2 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_13_R2/src/main/java/net/jitse/npclib/nms/v1_13_R2/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_13_R2.DataWatcherObject;
 import net.minecraft.server.v1_13_R2.DataWatcherRegistry;
 import net.minecraft.server.v1_13_R2.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_14_R1/src/main/java/net/jitse/npclib/nms/v1_14_R1/NPC_v1_14_R1.java

@@ -13,10 +13,7 @@ import org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -28,7 +25,6 @@ public class NPC_v1_14_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_14_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -60,12 +56,6 @@ public class NPC_v1_14_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -104,39 +94,8 @@ public class NPC_v1_14_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_14_R1/src/main/java/net/jitse/npclib/nms/v1_14_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_14_R1.DataWatcherObject;
 import net.minecraft.server.v1_14_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_14_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         // TODO: Find out why NPCState#CROUCHED doesn't work.

nms/v1_15_R1/pom.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0"?>
+<project
+        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
+        xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>net.jitse</groupId>
+        <artifactId>npclib-nms</artifactId>
+        <version>2.3.1-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>npclib-nms-v1_15_R1</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.spigotmc</groupId>
+            <artifactId>spigot</artifactId>
+            <version>1.15.2-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/NPC_v1_15_R1.java

@@ -0,0 +1,104 @@
+package net.jitse.npclib.nms.v1_15_R1;
+
+import net.jitse.npclib.NPCLib;
+import net.jitse.npclib.api.state.NPCSlot;
+import net.jitse.npclib.hologram.Hologram;
+import net.jitse.npclib.internal.MinecraftVersion;
+import net.jitse.npclib.internal.NPCBase;
+import net.jitse.npclib.nms.v1_15_R1.packets.*;
+import net.minecraft.server.v1_15_R1.*;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.v1_15_R1.entity.CraftPlayer;
+import org.bukkit.craftbukkit.v1_15_R1.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.List;
+
+/**
+ * @author Jitse Boonstra
+ */
+public class NPC_v1_15_R1 extends NPCBase {
+
+    private PacketPlayOutNamedEntitySpawn packetPlayOutNamedEntitySpawn;
+    private PacketPlayOutScoreboardTeam packetPlayOutScoreboardTeamRegister;
+    private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
+    private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
+    private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
+
+    public NPC_v1_15_R1(NPCLib instance, List<String> lines) {
+        super(instance, lines);
+    }
+
+    @Override
+    public void createPackets() {
+        this.hologram = new Hologram(MinecraftVersion.V1_15_R1, location.clone().add(0, 0.5, 0), text);
+
+        PacketPlayOutPlayerInfoWrapper packetPlayOutPlayerInfoWrapper = new PacketPlayOutPlayerInfoWrapper();
+
+        // Packets for spawning the NPC:
+        this.packetPlayOutScoreboardTeamRegister = new PacketPlayOutScoreboardTeamWrapper()
+                .createRegisterTeam(name); // First packet to send.
+
+        this.packetPlayOutPlayerInfoAdd = packetPlayOutPlayerInfoWrapper
+                .create(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, gameProfile, name); // Second packet to send.
+
+        this.packetPlayOutNamedEntitySpawn = new PacketPlayOutNamedEntitySpawnWrapper()
+                .create(uuid, location, entityId); // Third packet to send.
+
+        this.packetPlayOutEntityHeadRotation = new PacketPlayOutEntityHeadRotationWrapper()
+                .create(location, entityId); // Fourth packet to send.
+
+        this.packetPlayOutPlayerInfoRemove = packetPlayOutPlayerInfoWrapper
+                .create(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, gameProfile, name); // Fifth packet to send (delayed).
+
+        // Packet for destroying the NPC:
+        this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
+    }
+
+    @Override
+    public void sendShowPackets(Player player) {
+        PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
+
+        if (hasTeamRegistered.add(player.getUniqueId()))
+            playerConnection.sendPacket(packetPlayOutScoreboardTeamRegister);
+        playerConnection.sendPacket(packetPlayOutPlayerInfoAdd);
+        playerConnection.sendPacket(packetPlayOutNamedEntitySpawn);
+        playerConnection.sendPacket(packetPlayOutEntityHeadRotation);
+        sendMetadataPacket(player);
+
+        hologram.show(player);
+
+        Bukkit.getScheduler().runTaskLater(instance.getPlugin(), () ->
+                playerConnection.sendPacket(packetPlayOutPlayerInfoRemove), 50);
+    }
+
+    @Override
+    public void sendHidePackets(Player player) {
+        PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
+
+        playerConnection.sendPacket(packetPlayOutEntityDestroy);
+        playerConnection.sendPacket(packetPlayOutPlayerInfoRemove);
+
+        hologram.hide(player);
+    }
+
+    @Override
+    public void sendMetadataPacket(Player player) {
+        PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
+        PacketPlayOutEntityMetadata packet = new PacketPlayOutEntityMetadataWrapper().create(activeStates, entityId);
+
+        playerConnection.sendPacket(packet);
+    }
+
+    @Override
+    public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
+        PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
+
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
+        ItemStack item = getItem(slot);
+
+        PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
+        playerConnection.sendPacket(packet);
+    }
+}

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/packets/PacketPlayOutEntityHeadRotationWrapper.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018 Jitse Boonstra
+ */
+
+package net.jitse.npclib.nms.v1_15_R1.packets;
+
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.server.v1_15_R1.PacketPlayOutEntityHeadRotation;
+import org.bukkit.Location;
+
+/**
+ * @author Jitse Boonstra
+ */
+public class PacketPlayOutEntityHeadRotationWrapper {
+
+    public PacketPlayOutEntityHeadRotation create(Location location, int entityId) {
+        PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation = new PacketPlayOutEntityHeadRotation();
+
+        Reflection.getField(packetPlayOutEntityHeadRotation.getClass(), "a", int.class).
+                set(packetPlayOutEntityHeadRotation, entityId);
+        Reflection.getField(packetPlayOutEntityHeadRotation.getClass(), "b", byte.class)
+                .set(packetPlayOutEntityHeadRotation, (byte) ((int) location.getYaw() * 256.0F / 360.0F));
+
+        return packetPlayOutEntityHeadRotation;
+    }
+}

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -0,0 +1,39 @@
+package net.jitse.npclib.nms.v1_15_R1.packets;
+
+import net.jitse.npclib.api.state.NPCState;
+import net.minecraft.server.v1_15_R1.DataWatcher;
+import net.minecraft.server.v1_15_R1.DataWatcherObject;
+import net.minecraft.server.v1_15_R1.DataWatcherRegistry;
+import net.minecraft.server.v1_15_R1.PacketPlayOutEntityMetadata;
+
+import java.util.Collection;
+
+public class PacketPlayOutEntityMetadataWrapper {
+
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
+        DataWatcher dataWatcher = new DataWatcher(null);
+        dataWatcher.register(new DataWatcherObject<>(16, DataWatcherRegistry.a), (byte) 127);
+
+        byte masked = NPCState.getMasked(activateStates);
+        // TODO: Find out why NPCState#CROUCHED doesn't work.
+        dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);
+
+//        for (Player online : Bukkit.getOnlinePlayers()) {
+//            DataWatcher watcher = ((CraftPlayer) online).getHandle().getDataWatcher();
+//            try {
+//                Field entriesField = watcher.getClass().getDeclaredField("entries");
+//                entriesField.setAccessible(true);
+//
+//                Int2ObjectOpenHashMap<DataWatcher.Item<?>> entries = (Int2ObjectOpenHashMap<DataWatcher.Item<?>>) entriesField.get(watcher);
+//                entries.forEach((integer, item) -> {
+//                    if (item.b() instanceof Boolean || item.b() instanceof Byte)
+//                        online.sendMessage(integer + ": " + item.b() + " type = " + item.b().getClass().toString());
+//                });
+//            } catch (NoSuchFieldException | IllegalAccessException e) {
+//                e.printStackTrace();
+//            }
+//        }
+
+        return new PacketPlayOutEntityMetadata(entityId, dataWatcher, true);
+    }
+}

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/packets/PacketPlayOutNamedEntitySpawnWrapper.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2018 Jitse Boonstra
+ */
+
+package net.jitse.npclib.nms.v1_15_R1.packets;
+
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.server.v1_15_R1.PacketPlayOutNamedEntitySpawn;
+import org.bukkit.Location;
+
+import java.util.UUID;
+
+/**
+ * @author Jitse Boonstra
+ */
+public class PacketPlayOutNamedEntitySpawnWrapper {
+
+    public PacketPlayOutNamedEntitySpawn create(UUID uuid, Location location, int entityId) {
+        PacketPlayOutNamedEntitySpawn packetPlayOutNamedEntitySpawn = new PacketPlayOutNamedEntitySpawn();
+
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "a", int.class)
+                .set(packetPlayOutNamedEntitySpawn, entityId);
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "b", UUID.class)
+                .set(packetPlayOutNamedEntitySpawn, uuid);
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "c", double.class)
+                .set(packetPlayOutNamedEntitySpawn, location.getX());
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "d", double.class)
+                .set(packetPlayOutNamedEntitySpawn, location.getY());
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "e", double.class)
+                .set(packetPlayOutNamedEntitySpawn, location.getZ());
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "f", byte.class)
+                .set(packetPlayOutNamedEntitySpawn, (byte) ((int) (location.getYaw() * 256.0F / 360.0F)));
+        Reflection.getField(packetPlayOutNamedEntitySpawn.getClass(), "g", byte.class)
+                .set(packetPlayOutNamedEntitySpawn, (byte) ((int) (location.getPitch() * 256.0F / 360.0F)));
+
+        return packetPlayOutNamedEntitySpawn;
+    }
+}

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/packets/PacketPlayOutPlayerInfoWrapper.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2018 Jitse Boonstra
+ */
+
+package net.jitse.npclib.nms.v1_15_R1.packets;
+
+import com.comphenix.tinyprotocol.Reflection;
+import com.mojang.authlib.GameProfile;
+import net.minecraft.server.v1_15_R1.EnumGamemode;
+import net.minecraft.server.v1_15_R1.IChatBaseComponent;
+import net.minecraft.server.v1_15_R1.PacketPlayOutPlayerInfo;
+import org.bukkit.ChatColor;
+
+import java.util.List;
+
+/**
+ * @author Jitse Boonstra
+ */
+public class PacketPlayOutPlayerInfoWrapper {
+
+    private final Class<?> packetPlayOutPlayerInfoClazz = Reflection.getMinecraftClass("PacketPlayOutPlayerInfo");
+    private final Class<?> playerInfoDataClazz = Reflection.getMinecraftClass("PacketPlayOutPlayerInfo$PlayerInfoData");
+    private final Reflection.ConstructorInvoker playerInfoDataConstructor = Reflection.getConstructor(playerInfoDataClazz,
+            packetPlayOutPlayerInfoClazz, GameProfile.class, int.class, EnumGamemode.class, IChatBaseComponent.class);
+
+    public PacketPlayOutPlayerInfo create(PacketPlayOutPlayerInfo.EnumPlayerInfoAction action, GameProfile gameProfile, String name) {
+        PacketPlayOutPlayerInfo packetPlayOutPlayerInfo = new PacketPlayOutPlayerInfo();
+        Reflection.getField(packetPlayOutPlayerInfo.getClass(), "a", PacketPlayOutPlayerInfo.EnumPlayerInfoAction.class)
+                .set(packetPlayOutPlayerInfo, action);
+
+        Object playerInfoData = playerInfoDataConstructor.invoke(packetPlayOutPlayerInfo,
+                gameProfile, 1, EnumGamemode.NOT_SET,
+                IChatBaseComponent.ChatSerializer.b("{\"text\":\"" + ChatColor.BLUE + "[NPC] " + name + "\"}")
+        );
+
+        Reflection.FieldAccessor<List> fieldAccessor = Reflection.getField(packetPlayOutPlayerInfo.getClass(), "b", List.class);
+        List list = fieldAccessor.get(packetPlayOutPlayerInfo);
+        list.add(playerInfoData);
+        fieldAccessor.set(packetPlayOutPlayerInfo, list);
+
+        return packetPlayOutPlayerInfo;
+    }
+}

nms/v1_15_R1/src/main/java/net/jitse/npclib/nms/v1_15_R1/packets/PacketPlayOutScoreboardTeamWrapper.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018 Jitse Boonstra
+ */
+
+package net.jitse.npclib.nms.v1_15_R1.packets;
+
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.server.v1_15_R1.ChatComponentText;
+import net.minecraft.server.v1_15_R1.IChatBaseComponent;
+import net.minecraft.server.v1_15_R1.PacketPlayOutScoreboardTeam;
+
+import java.util.Collection;
+
+/**
+ * @author Jitse Boonstra
+ */
+public class PacketPlayOutScoreboardTeamWrapper {
+
+    public PacketPlayOutScoreboardTeam createRegisterTeam(String name) {
+        PacketPlayOutScoreboardTeam packetPlayOutScoreboardTeam = new PacketPlayOutScoreboardTeam();
+
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "i", int.class)
+                .set(packetPlayOutScoreboardTeam, 0);
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "a", String.class)
+                .set(packetPlayOutScoreboardTeam, name);
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "b", IChatBaseComponent.class)
+                .set(packetPlayOutScoreboardTeam, new ChatComponentText(name));
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "e", String.class)
+                .set(packetPlayOutScoreboardTeam, "never");
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "f", String.class)
+                .set(packetPlayOutScoreboardTeam, "never");
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "j", int.class)
+                .set(packetPlayOutScoreboardTeam, 0);
+        Reflection.FieldAccessor<Collection> collectionFieldAccessor = Reflection.getField(
+                packetPlayOutScoreboardTeam.getClass(), "h", Collection.class);
+        Collection collection = collectionFieldAccessor.get(packetPlayOutScoreboardTeam);
+        collection.add(name);
+        collectionFieldAccessor.set(packetPlayOutScoreboardTeam, collection);
+
+        return packetPlayOutScoreboardTeam;
+    }
+
+    public PacketPlayOutScoreboardTeam createUnregisterTeam(String name) {
+        PacketPlayOutScoreboardTeam packetPlayOutScoreboardTeam = new PacketPlayOutScoreboardTeam();
+
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "i", int.class)
+                .set(packetPlayOutScoreboardTeam, 1);
+        Reflection.getField(packetPlayOutScoreboardTeam.getClass(), "a", String.class)
+                .set(packetPlayOutScoreboardTeam, name);
+
+        return packetPlayOutScoreboardTeam;
+    }
+}

nms/v1_8_R2/src/main/java/net/jitse/npclib/nms/v1_8_R2/NPC_v1_8_R2.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_8_R2.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_8_R2 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_8_R2(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_8_R2 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -107,30 +97,12 @@ public class NPC_v1_8_R2 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        ItemStack item;
+        if (slot == NPCSlot.OFFHAND && !auto) {
-        switch (slot) {
+            throw new UnsupportedOperationException("Offhand is not supported on servers below 1.9");
-            case HELMET:
-                item = helmet;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                break;
-            case BOOTS:
-                item = boots;
-                break;
-            case MAINHAND:
-                item = inHand;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
         }
 
+        ItemStack item = getItem(slot);
+
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, slot.getSlot(), CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);
     }

nms/v1_8_R2/src/main/java/net/jitse/npclib/nms/v1_8_R2/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -4,9 +4,11 @@ import net.jitse.npclib.api.state.NPCState;
 import net.minecraft.server.v1_8_R2.DataWatcher;
 import net.minecraft.server.v1_8_R2.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.a(0, masked);

nms/v1_8_R3/src/main/java/net/jitse/npclib/nms/v1_8_R3/NPC_v1_8_R3.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_8_R3.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_8_R3 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_8_R3(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_8_R3 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,30 +98,12 @@ public class NPC_v1_8_R3 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        ItemStack item;
+        if (slot == NPCSlot.OFFHAND && !auto) {
-        switch (slot) {
+            throw new UnsupportedOperationException("Offhand is not supported on servers below 1.9");
-            case HELMET:
-                item = helmet;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                break;
-            case BOOTS:
-                item = boots;
-                break;
-            case MAINHAND:
-                item = inHand;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
         }
 
+        ItemStack item = getItem(slot);
+
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, slot.getSlot(), CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);
     }

nms/v1_8_R3/src/main/java/net/jitse/npclib/nms/v1_8_R3/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -4,9 +4,11 @@ import net.jitse.npclib.api.state.NPCState;
 import net.minecraft.server.v1_8_R3.DataWatcher;
 import net.minecraft.server.v1_8_R3.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.a(0, masked);

nms/v1_9_R1/src/main/java/net/jitse/npclib/nms/v1_9_R1/NPC_v1_9_R1.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_9_R1.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_9_R1 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_9_R1(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_9_R1 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_9_R1 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_9_R1/src/main/java/net/jitse/npclib/nms/v1_9_R1/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_9_R1.DataWatcherObject;
 import net.minecraft.server.v1_9_R1.DataWatcherRegistry;
 import net.minecraft.server.v1_9_R1.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

nms/v1_9_R2/src/main/java/net/jitse/npclib/nms/v1_9_R2/NPC_v1_9_R2.java

@@ -17,10 +17,7 @@ import org.bukkit.craftbukkit.v1_9_R2.inventory.CraftItemStack;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
-import java.util.UUID;
 
 /**
  * @author Jitse Boonstra
@@ -32,7 +29,6 @@ public class NPC_v1_9_R2 extends NPCBase {
     private PacketPlayOutPlayerInfo packetPlayOutPlayerInfoAdd, packetPlayOutPlayerInfoRemove;
     private PacketPlayOutEntityHeadRotation packetPlayOutEntityHeadRotation;
     private PacketPlayOutEntityDestroy packetPlayOutEntityDestroy;
-    private Set<UUID> hasTeamRegistered = new HashSet<>();
 
     public NPC_v1_9_R2(NPCLib instance, List<String> lines) {
         super(instance, lines);
@@ -64,12 +60,6 @@ public class NPC_v1_9_R2 extends NPCBase {
         this.packetPlayOutEntityDestroy = new PacketPlayOutEntityDestroy(entityId); // First packet to send.
     }
 
-    @Override
-    public void onLogout(Player player) {
-        super.onLogout(player);
-        hasTeamRegistered.remove(player.getUniqueId());
-    }
-
     @Override
     public void sendShowPackets(Player player) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
@@ -108,39 +98,8 @@ public class NPC_v1_9_R2 extends NPCBase {
     public void sendEquipmentPacket(Player player, NPCSlot slot, boolean auto) {
         PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
 
-        EnumItemSlot nmsSlot;
+        EnumItemSlot nmsSlot = slot.getNmsEnum(EnumItemSlot.class);
-        ItemStack item;
+        ItemStack item = getItem(slot);
-        switch (slot) {
-            case HELMET:
-                item = helmet;
-                nmsSlot = EnumItemSlot.HEAD;
-                break;
-            case CHESTPLATE:
-                item = chestplate;
-                nmsSlot = EnumItemSlot.CHEST;
-                break;
-            case LEGGINGS:
-                item = leggings;
-                nmsSlot = EnumItemSlot.LEGS;
-                break;
-            case BOOTS:
-                item = boots;
-                nmsSlot = EnumItemSlot.FEET;
-                break;
-            case MAINHAND:
-                item = inHand;
-                nmsSlot = EnumItemSlot.MAINHAND;
-                break;
-            case OFFHAND:
-                item = offHand;
-                nmsSlot = EnumItemSlot.OFFHAND;
-                break;
-            default:
-                if (!auto) {
-                    throw new IllegalArgumentException(slot.toString() + " is not a supported slot for the version of your server");
-                }
-                return;
-        }
 
         PacketPlayOutEntityEquipment packet = new PacketPlayOutEntityEquipment(entityId, nmsSlot, CraftItemStack.asNMSCopy(item));
         playerConnection.sendPacket(packet);

nms/v1_9_R2/src/main/java/net/jitse/npclib/nms/v1_9_R2/packets/PacketPlayOutEntityMetadataWrapper.java

@@ -6,9 +6,11 @@ import net.minecraft.server.v1_9_R2.DataWatcherObject;
 import net.minecraft.server.v1_9_R2.DataWatcherRegistry;
 import net.minecraft.server.v1_9_R2.PacketPlayOutEntityMetadata;
 
+import java.util.Collection;
+
 public class PacketPlayOutEntityMetadataWrapper {
 
-    public PacketPlayOutEntityMetadata create(NPCState[] activateStates, int entityId) {
+    public PacketPlayOutEntityMetadata create(Collection<NPCState> activateStates, int entityId) {
         DataWatcher dataWatcher = new DataWatcher(null);
         byte masked = NPCState.getMasked(activateStates);
         dataWatcher.register(new DataWatcherObject<>(0, DataWatcherRegistry.a), masked);

plugin/pom.xml

@@ -86,6 +86,12 @@
             <version>${project.version}</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>net.jitse</groupId>
+            <artifactId>npclib-nms-v1_15_R1</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 
     <build>