Add wrapper for ItemSlot

Closes #183

Author: dmulloy2

modules/API/src/main/java/com/comphenix/protocol/events/PacketContainer.java

@@ -80,6 +80,7 @@
 import com.comphenix.protocol.wrappers.EnumWrappers.CombatEventType;
 import com.comphenix.protocol.wrappers.EnumWrappers.Difficulty;
 import com.comphenix.protocol.wrappers.EnumWrappers.EntityUseAction;
+import com.comphenix.protocol.wrappers.EnumWrappers.ItemSlot;
 import com.comphenix.protocol.wrappers.EnumWrappers.NativeGameMode;
 import com.comphenix.protocol.wrappers.EnumWrappers.Particle;
 import com.comphenix.protocol.wrappers.EnumWrappers.PlayerAction;
@@ -866,6 +867,15 @@ public StructureModifier<SoundCategory> getSoundCategories() {
     			EnumWrappers.getSoundCategoryClass(), EnumWrappers.getSoundCategoryConverter());
     }
 
+    /**
+     * Retrive a read/write structure for the ItemSlot enum in 1.9.
+     * @return A modifier for ItemSlot enum fields.
+     */
+    public StructureModifier<ItemSlot> getItemSlots() {
+    	return structureModifier.<ItemSlot>withType(
+    			EnumWrappers.getItemSlotClass(), EnumWrappers.getItemSlotConverter());
+    }
+
 	/**
 	 * Retrieves the ID of this packet.
 	 * <p>

modules/API/src/main/java/com/comphenix/protocol/wrappers/EnumWrappers.java

@@ -306,6 +306,15 @@ public static SoundCategory getByKey(String key) {
 		}
 	}
 
+	public enum ItemSlot {
+		MAINHAND,
+		OFFHAND,
+		FEET,
+		LEGS,
+		CHEST,
+		HEAD;
+	}
+
 	private static Class<?> PROTOCOL_CLASS = null;
 	private static Class<?> CLIENT_COMMAND_CLASS = null;
 	private static Class<?> CHAT_VISIBILITY_CLASS = null;
@@ -322,6 +331,7 @@ public static SoundCategory getByKey(String key) {
 	private static Class<?> SCOREBOARD_ACTION_CLASS = null;
 	private static Class<?> PARTICLE_CLASS = null;
 	private static Class<?> SOUND_CATEGORY_CLASS = null;
+	private static Class<?> ITEM_SLOT_CLASS = null;
 
 	private static boolean INITIALIZED = false;
 	private static Map<Class<?>, EquivalentConverter<?>> FROM_NATIVE = Maps.newHashMap();
@@ -355,6 +365,7 @@ private static void initialize() {
 		SCOREBOARD_ACTION_CLASS = getEnum(PacketType.Play.Server.SCOREBOARD_SCORE.getPacketClass(), 0);
 		PARTICLE_CLASS = getEnum(PacketType.Play.Server.WORLD_PARTICLES.getPacketClass(), 0);
 		SOUND_CATEGORY_CLASS = getEnum(PacketType.Play.Server.CUSTOM_SOUND_EFFECT.getPacketClass(), 0);
+		ITEM_SLOT_CLASS = getEnum(PacketType.Play.Server.ENTITY_EQUIPMENT.getPacketClass(), 0);
 
 		associate(PROTOCOL_CLASS, Protocol.class, getClientCommandConverter());
 		associate(CLIENT_COMMAND_CLASS, ClientCommand.class, getClientCommandConverter());
@@ -372,6 +383,7 @@ private static void initialize() {
 		associate(SCOREBOARD_ACTION_CLASS, ScoreboardAction.class, getUpdateScoreActionConverter());
 		associate(PARTICLE_CLASS, Particle.class, getParticleConverter());
 		associate(SOUND_CATEGORY_CLASS, SoundCategory.class, getSoundCategoryConverter());
+		associate(ITEM_SLOT_CLASS, ItemSlot.class, getItemSlotConverter());
 		INITIALIZED = true;
 	}
 
@@ -485,6 +497,11 @@ public static Class<?> getSoundCategoryClass() {
 		return SOUND_CATEGORY_CLASS;
 	}
 
+	public static Class<?> getItemSlotClass() {
+		initialize();
+		return ITEM_SLOT_CLASS;
+	}
+
 	// Get the converters
 	public static EquivalentConverter<Protocol> getProtocolConverter() {
 		return new EnumConverter<Protocol>(Protocol.class);
@@ -550,6 +567,10 @@ public static EquivalentConverter<SoundCategory> getSoundCategoryConverter() {
 		return new EnumConverter<SoundCategory>(SoundCategory.class);
 	}
 
+	public static EquivalentConverter<ItemSlot> getItemSlotConverter() {
+		return new EnumConverter<ItemSlot>(ItemSlot.class);
+	}
+
 	/**
 	 * Retrieve a generic enum converter for use with StructureModifiers.
 	 * @param enumClass - Enum class