Refactor the wrapper classes so they inherit from a common class.

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

@@ -43,6 +43,10 @@ public class PacketType implements Serializable {
 	public static class Handshake {
 		private static final Protocol PROTOCOL = Protocol.HANDSHAKING;
 		
+		/**
+		 * Incoming packets.
+		 * @author Kristian
+		 */
 		public static class Client extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.CLIENT;
 			/**
@@ -92,6 +96,10 @@ public class PacketType implements Serializable {
 	public static class Play {
 		private static final Protocol PROTOCOL = Protocol.GAME;
 		
+		/**
+		 * Outgoing packets.
+		 * @author Kristian
+		 */
 		public static class Server extends ObjectEnum<PacketType> {		
 			private final static Sender SENDER = Sender.SERVER;
 			
@@ -183,6 +191,10 @@ public class PacketType implements Serializable {
 			}
 		}
 		
+		/**
+		 * Incoming packets.
+		 * @author Kristian
+		 */
 		public static class Client extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.CLIENT;
 			
@@ -236,6 +248,10 @@ public class PacketType implements Serializable {
 	public static class Status {
 		private static final Protocol PROTOCOL = Protocol.STATUS;
 		
+		/**
+		 * Outgoing packets.
+		 * @author Kristian
+		 */
 		public static class Server extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.SERVER;
 			
@@ -256,6 +272,10 @@ public class PacketType implements Serializable {
 			}
 		}
 		
+		/**
+		 * Incoming packets.
+		 * @author Kristian
+		 */
 		public static class Client extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.CLIENT;		
 			
@@ -288,6 +308,10 @@ public class PacketType implements Serializable {
 	public static class Login {
 		private static final Protocol PROTOCOL = Protocol.LOGIN;
 		
+		/**
+		 * Outgoing packets.
+		 * @author Kristian
+		 */
 		public static class Server extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.SERVER;
 			
@@ -309,6 +333,10 @@ public class PacketType implements Serializable {
 			}
 		}
 		
+		/**
+		 * Incoming packets.
+		 * @author Kristian
+		 */
 		public static class Client extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.CLIENT;
 			
@@ -341,6 +369,10 @@ public class PacketType implements Serializable {
 	public static class Legacy {
 		private static final Protocol PROTOCOL = Protocol.LEGACY;
 		
+		/**
+		 * Outgoing packets.
+		 * @author Kristian
+		 */
 		// Missing server packets: [10, 11, 12, 21, 107, 252]
 		public static class Server extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.SERVER;
@@ -377,6 +409,10 @@ public class PacketType implements Serializable {
 			}
 		}
 		
+		/**
+		 * Incoming packets.
+		 * @author Kristian
+		 */
 		// Missing client packets: [1, 9, 255]
 		public static class Client extends ObjectEnum<PacketType> {
 			private final static Sender SENDER = Sender.CLIENT;

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/AbstractWrapper.java

@@ -0,0 +1,50 @@
+package com.comphenix.protocol.wrappers;
+
+import com.google.common.base.Preconditions;
+
+/**
+ * Represents a wrapper for an NMS object.
+ * @author Kristian
+ */
+public abstract class AbstractWrapper {
+	protected Object handle;
+	protected Class<?> handleType;
+	
+	/**
+	 * Construct a new NMS wrapper.
+	 * @param handle - the wrapped NMS object.
+	 */
+	public AbstractWrapper(Class<?> handleType) {
+		this.handleType = Preconditions.checkNotNull(handleType, "handleType cannot be NULL");
+	}
+
+	/**
+	 * Set the underlying NMS object.
+	 * @param handle - the NMS object.
+	 * @throws IllegalArgumentException If the handle is NULL.
+	 * @throws IllegalArgumentException If the handle is not assignable to {@link #getHandleType()}.
+	 */
+	protected void setHandle(Object handle) {
+		if (handle == null)
+			throw new IllegalArgumentException("handle cannot be NULL.");
+		if (!handleType.isAssignableFrom(handle.getClass()))
+			throw new IllegalArgumentException("handle (" + handle + ") is not a " + handleType);
+		this.handle = handle;
+	}
+	
+	/**
+	 * Retrieves the underlying NMS object.
+	 * @return The underlying NMS object.
+	 */
+	public Object getHandle() {
+		return handle;
+	}
+	
+	/**
+	 * Retrieve the type of the handle.
+	 * @return The type of the handle.
+	 */
+	public Class<?> getHandleType() {
+		return handleType;
+	}
+}

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedAttribute.java

@@ -24,7 +24,7 @@ import com.google.common.collect.Sets;
  * Represents a single attribute sent in packet 44.
  * @author Kristian
  */
-public class WrappedAttribute {
+public class WrappedAttribute extends AbstractWrapper {
 	// Shared structure modifier
 	private static StructureModifier<Object> ATTRIBUTE_MODIFIER;
 	
@@ -43,6 +43,22 @@ public class WrappedAttribute {
 	// Cached modifiers list
 	private Set<WrappedAttributeModifier> attributeModifiers;
 	
+	/**
+	 * Construct a wrapper around a specific NMS instance.
+	 * @param handle - the NMS instance.
+	 */
+	private WrappedAttribute(@Nonnull Object handle) {
+		super(MinecraftReflection.getAttributeSnapshotClass());
+		setHandle(handle);
+		
+		// Initialize modifier
+		if (ATTRIBUTE_MODIFIER == null) {
+			ATTRIBUTE_MODIFIER = new StructureModifier<Object>(MinecraftReflection.getAttributeSnapshotClass());
+		}
+		this.modifier = ATTRIBUTE_MODIFIER.withTarget(handle);
+	}
+	
+	
 	/**
 	 * Construct a new wrapped attribute around a specific NMS instance.
 	 * @param handle - handle to a NMS AttributeSnapshot.
@@ -70,33 +86,6 @@ public class WrappedAttribute {
 		return new Builder(Preconditions.checkNotNull(template, "template cannot be NULL."));
 	}
 	
-	/**
-	 * Construct a wrapper around a specific NMS instance.
-	 * @param handle - the NMS instance.
-	 */
-	private WrappedAttribute(@Nonnull Object handle) {
-		this.handle = Preconditions.checkNotNull(handle, "handle cannot be NULL.");
-		
-		// Check handle type
-		if (!MinecraftReflection.getAttributeSnapshotClass().isAssignableFrom(handle.getClass())) {
-			throw new IllegalArgumentException("handle (" + handle + ") must be a AttributeSnapshot.");
-		}
-		
-		// Initialize modifier
-		if (ATTRIBUTE_MODIFIER == null) {
-			ATTRIBUTE_MODIFIER = new StructureModifier<Object>(MinecraftReflection.getAttributeSnapshotClass());
-		}
-		this.modifier = ATTRIBUTE_MODIFIER.withTarget(handle);
-	}
-	
-	/**
-	 * Retrieve the underlying NMS attribute snapshot.
-	 * @return The underlying attribute snapshot.
-	 */
-	public Object getHandle() {
-		return handle;
-	}
-	
 	/**
 	 * Retrieve the unique attribute key that identifies its function.
 	 * <p>

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedAttributeModifier.java

@@ -19,7 +19,7 @@ import com.google.common.base.Preconditions;
  * 
  * @author Kristian
  */
-public class WrappedAttributeModifier {
+public class WrappedAttributeModifier extends AbstractWrapper {
 	 /**
 	  * Represents the different modifier operations.
 	  * <p>
@@ -86,10 +86,7 @@ public class WrappedAttributeModifier {
 	// The constructor we are interested in
 	private static Constructor<?> ATTRIBUTE_MODIFIER_CONSTRUCTOR;
 	
-	/**
-	 * Handle to the underlying AttributeModifier.
-	 */
-	protected Object handle;
+	// A modifier for the wrapped handler
 	protected StructureModifier<Object> modifier;
 	
 	// Cached values
@@ -98,6 +95,58 @@ public class WrappedAttributeModifier {
 	private final Operation operation;
 	private final double amount;
 	
+	/**
+	 * Construct a new wrapped attribute modifier with no associated handle.
+	 * <p>
+	 * Note that the handle object is not initialized after this constructor.
+	 * @param uuid - the UUID.
+	 * @param name - the human readable name.
+	 * @param amount - the amount.
+	 * @param operation - the operation.
+	 */
+	protected WrappedAttributeModifier(UUID uuid, String name, double amount, Operation operation) {
+		super(MinecraftReflection.getAttributeModifierClass());
+		
+		// Use the supplied values instead of reading from the NMS instance
+		this.uuid = uuid;
+		this.name = name;
+		this.amount = amount;
+		this.operation = operation;
+	}
+	
+	/**
+	 * Construct an attribute modifier wrapper around a given NMS instance.
+	 * @param handle - the NMS instance.
+	 */
+	protected WrappedAttributeModifier(@Nonnull Object handle) {
+		// Update handle and modifier
+		super(MinecraftReflection.getAttributeModifierClass());
+		setHandle(handle);
+		initializeModifier(handle);
+		
+		// Load final values, caching them
+		this.uuid = (UUID) modifier.withType(UUID.class).read(0);
+	    this.name = (String) modifier.withType(String.class).read(0);
+	    this.amount = (Double) modifier.withType(double.class).read(0);
+	    this.operation = Operation.fromId((Integer) modifier.withType(int.class).read(0));
+	}
+	
+	/**
+	 * Construct an attribute modifier wrapper around a NMS instance.
+	 * @param handle - the NMS instance.
+	 * @param uuid - the UUID.
+	 * @param name - the human readable name.
+	 * @param amount - the amount.
+	 * @param operation - the operation.
+	 */
+	protected WrappedAttributeModifier(@Nonnull Object handle, UUID uuid, String name, double amount, Operation operation) {
+		this(uuid, name, amount, operation);
+		
+		// Initialize handle and modifier
+		setHandle(handle);
+		initializeModifier(handle);
+	}
+	
 	/**
 	 * Construct a new attribute modifier builder.
 	 * <p>
@@ -136,53 +185,6 @@ public class WrappedAttributeModifier {
 		return new WrappedAttributeModifier(handle);
 	}
 		
-	/**
-	 * Construct a new wrapped attribute modifier with no associated handle.
-	 * @param uuid - the UUID.
-	 * @param name - the human readable name.
-	 * @param amount - the amount.
-	 * @param operation - the operation.
-	 */
-	protected WrappedAttributeModifier(UUID uuid, String name, double amount, Operation operation) {
-		// Use the supplied values instead of reading from the NMS instance
-		this.uuid = uuid;
-		this.name = name;
-		this.amount = amount;
-		this.operation = operation;
-	}
-	
-	/**
-	 * Construct an attribute modifier wrapper around a given NMS instance.
-	 * @param handle - the NMS instance.
-	 */
-	protected WrappedAttributeModifier(@Nonnull Object handle) {
-		// Update handle and modifier
-		setHandle(handle);
-		initializeModifier(handle);
-		
-		// Load final values, caching them
-		this.uuid = (UUID) modifier.withType(UUID.class).read(0);
-	    this.name = (String) modifier.withType(String.class).read(0);
-	    this.amount = (Double) modifier.withType(double.class).read(0);
-	    this.operation = Operation.fromId((Integer) modifier.withType(int.class).read(0));
-	}
-	
-	/**
-	 * Construct an attribute modifier wrapper around a NMS instance.
-	 * @param handle - the NMS instance.
-	 * @param uuid - the UUID.
-	 * @param name - the human readable name.
-	 * @param amount - the amount.
-	 * @param operation - the operation.
-	 */
-	protected WrappedAttributeModifier(@Nonnull Object handle, UUID uuid, String name, double amount, Operation operation) {
-		this(uuid, name, amount, operation);
-		
-		// Initialize handle and modifier
-		setHandle(handle);
-		initializeModifier(handle);
-	}
-	
 	/**
 	 * Initialize modifier from a given handle.
 	 * @param handle - the handle.
@@ -196,17 +198,6 @@ public class WrappedAttributeModifier {
 		this.modifier = BASE_MODIFIER.withTarget(handle);
 	}
 	
-	/**
-	 * Set the handle of a modifier.
-	 * @param handle - the underlying handle.
-	 */
-	private void setHandle(Object handle) {
-		// Check handle type
-		if (!MinecraftReflection.getAttributeModifierClass().isAssignableFrom(handle.getClass())) 
-			throw new IllegalArgumentException("handle (" + handle + ") must be a AttributeModifier.");
-		this.handle = handle;
-	}
-	
 	/**
 	 * Retrieve the unique UUID that identifies the origin of this modifier.
 	 * @return The unique UUID.
@@ -241,16 +232,6 @@ public class WrappedAttributeModifier {
 		return amount;
 	}
 	
-	/**
-	 * Invoked when we need to construct a handle object.
-	 */
-	protected void checkHandle() {
-		if (handle == null) {
-			handle = newBuilder(this).build().getHandle();
-			initializeModifier(handle);
-		}
-	}
-	
 	/**
 	 * Retrieve the underlying attribute modifier.
 	 * @return The underlying modifier.

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedChatComponent.java

@@ -11,7 +11,7 @@ import com.comphenix.protocol.utility.MinecraftReflection;
  * Represents a chat component added in Minecraft 1.7.2
  * @author Kristian
  */
-public class WrappedChatComponent {
+public class WrappedChatComponent extends AbstractWrapper {
 	private static final Class<?> SERIALIZER = MinecraftReflection.getChatSerializer();
 	private static final Class<?> COMPONENT = MinecraftReflection.getIChatBaseComponent();
 	private static MethodAccessor SERIALIZE_COMPONENT = null;
@@ -32,11 +32,11 @@ public class WrappedChatComponent {
 			MinecraftReflection.getCraftChatMessage(), "fromString", String.class);
 	}
 	
-	private Object handle;
 	private transient String cache;
 	
 	private WrappedChatComponent(Object handle, String cache) {
-		this.handle = handle;
+		super(MinecraftReflection.getIChatBaseComponent());
+		setHandle(handle);
 		this.cache = cache;
 	}
 	
@@ -46,10 +46,6 @@ public class WrappedChatComponent {
 	 * @return The wrapper.
 	 */
 	public static WrappedChatComponent fromHandle(Object handle) {
-		if (handle == null)
-			throw new IllegalArgumentException("handle cannot be NULL.");
-		if (!COMPONENT.isAssignableFrom(handle.getClass()))
-			throw new IllegalArgumentException("handle (" + handle + ") is not a " + COMPONENT);
 		return new WrappedChatComponent(handle, null);
 	}
 	
@@ -101,14 +97,6 @@ public class WrappedChatComponent {
 		this.cache = obj;
 	}
 
-	/**
-	 * Retrieve the underlying IChatBaseComponent instance.
-	 * @return The underlying instance.
-	 */
-	public Object getHandle() {
-		return handle;
-	}
-
 	@Override
 	public boolean equals(Object obj) {
 		if (obj == this)

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedChunkCoordinate.java

@@ -26,27 +26,26 @@ import com.google.common.base.Objects;
  * 
  * @author Kristian
  */
-public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate> {
-
+public class WrappedChunkCoordinate extends AbstractWrapper implements Comparable<WrappedChunkCoordinate> {
 	/**
 	 * If TRUE, NULLs should be put before non-null instances of this class.
 	 */
 	private static final boolean LARGER_THAN_NULL = true;
 
-	@SuppressWarnings("rawtypes")
-	protected Comparable handle;
-
 	// Used to access a ChunkCoordinate
-	private static StructureModifier<Integer> intModifier;
+	private static StructureModifier<Integer> SHARED_MODIFIER;
+	
+	// The current modifier
+	private StructureModifier<Integer> handleModifier;
 	
 	/**
 	 * Create a new empty wrapper.
 	 */
-	@SuppressWarnings("rawtypes")
 	public WrappedChunkCoordinate() {
+		super(MinecraftReflection.getChunkCoordinatesClass());
+		
 		try {	
-			this.handle = (Comparable) MinecraftReflection.getChunkCoordinatesClass().newInstance();
-			initializeModifier();
+			setHandle(getHandleType().newInstance());
 		} catch (Exception e) {
 			throw new RuntimeException("Cannot construct chunk coordinate.");
 		}
@@ -58,17 +57,17 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 */
 	@SuppressWarnings("rawtypes")
 	public WrappedChunkCoordinate(Comparable handle) {
-		if (handle == null)
-			throw new IllegalArgumentException("handle cannot be NULL");
-		this.handle = handle;
-		initializeModifier();
+		super(MinecraftReflection.getChunkCoordinatesClass());
+		setHandle(handle);
 	}
 
 	// Ensure that the structure modifier is initialized
-	private void initializeModifier() {
-		if (intModifier == null) {
-			intModifier = new StructureModifier<Object>(handle.getClass(), null, false).withType(int.class);
-		}
+	private StructureModifier<Integer> getModifier() {
+		if (SHARED_MODIFIER == null)
+			SHARED_MODIFIER = new StructureModifier<Object>(handle.getClass(), null, false).withType(int.class);
+		if (handleModifier == null)
+			handleModifier = SHARED_MODIFIER.withTarget(handle);
+		return handleModifier;
 	}
 	
 	/**
@@ -101,7 +100,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @return The x coordinate.
 	 */
 	public int getX() {
-		return intModifier.read(0);
+		return getModifier().read(0);
 	}
 	
 	/**
@@ -109,7 +108,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @param newX - the new x coordinate.
 	 */
 	public void setX(int newX) {
-		intModifier.write(0, newX);
+		getModifier().write(0, newX);
 	}
 	
 	/**
@@ -117,7 +116,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @return The y coordinate.
 	 */
 	public int getY() {
-		return intModifier.read(1);
+		return getModifier().read(1);
 	}
 	
 	/**
@@ -125,7 +124,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @param newY - the new y coordinate.
 	 */
 	public void setY(int newY) {
-		intModifier.write(1, newY);
+		getModifier().write(1, newY);
 	}
 	
 	/**
@@ -133,7 +132,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @return The z coordinate.
 	 */
 	public int getZ() {
-		return intModifier.read(2);
+		return getModifier().read(2);
 	}
 	
 	/**
@@ -141,7 +140,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 	 * @param newZ - the new z coordinate.
 	 */
 	public void setZ(int newZ) {
-		intModifier.write(2, newZ);
+		getModifier().write(2, newZ);
 	}
 	
 	/**
@@ -159,7 +158,7 @@ public class WrappedChunkCoordinate implements Comparable<WrappedChunkCoordinate
 		if (other.handle == null)
 			return LARGER_THAN_NULL ? -1 : 1;
 		else
-			return handle.compareTo(other.handle);
+			return ((Comparable<Object>) handle).compareTo(other.handle);
 	}
 
 	@Override

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedDataWatcher.java

@@ -52,35 +52,32 @@ import com.google.common.collect.Iterators;
  * 
  * @author Kristian
  */
-public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
+public class WrappedDataWatcher extends AbstractWrapper implements Iterable<WrappedWatchableObject> {
 	/**
 	 * Used to assign integer IDs to given types.
 	 */
-	private static Map<Class<?>, Integer> typeMap;
+	private static Map<Class<?>, Integer> TYPE_MAP;
 
 	// Fields
-	private static Field valueMapField;
-	private static Field readWriteLockField;
-	private static Field entityField;
+	private static Field VALUE_MAP_FIELD;
+	private static Field READ_WRITE_LOCK_FIELD;
+	private static Field ENTITY_FIELD;
 	
 	// Methods
-	private static Method createKeyValueMethod;
-	private static Method updateKeyValueMethod;
-	private static Method getKeyValueMethod;
+	private static Method CREATE_KEY_VALUE_METHOD;
+	private static Method UPDATE_KEY_VALUE_METHOD;
+	private static Method GET_KEY_VALUE_METHOD;
 	
 	// Constructors
-	private static Constructor<?> createDataWatcherConstructor;
+	private static Constructor<?> CREATE_DATA_WATCHER_CONSTRUCTOR;
 	
 	// Entity methods
-	private volatile static Field entityDataField;
+	private volatile static Field ENTITY_DATA_FIELD;
 	
 	/**
 	 * Whether or not this class has already been initialized.
 	 */
-	private static boolean hasInitialized;
-	
-	// The underlying DataWatcher we're modifying
-	protected Object handle;
+	private static boolean HAS_INITIALIZED;
 	
 	// Lock
 	private ReadWriteLock readWriteLock;
@@ -96,12 +93,14 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	 * @throws FieldAccessException If we're unable to wrap a DataWatcher.
 	 */
 	public WrappedDataWatcher() {
+		super(MinecraftReflection.getDataWatcherClass());
+		
 		// Just create a new watcher
 		try {
 			if (MinecraftReflection.isUsingNetty()) {
-				this.handle = newEntityHandle(null);
+				setHandle(newEntityHandle(null));
 			} else {
-				this.handle = MinecraftReflection.getDataWatcherClass().newInstance();
+				setHandle(getHandleType().newInstance());
 			}
 			initialize();
 			
@@ -116,12 +115,8 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	 * @throws FieldAccessException If we're unable to wrap a DataWatcher.
 	 */
 	public WrappedDataWatcher(Object handle) {
-		if (handle == null)
-			throw new IllegalArgumentException("Handle cannot be NULL.");
-		if (!MinecraftReflection.isDataWatcher(handle))
-			throw new IllegalArgumentException("The value " + handle + " is not a DataWatcher.");
-		
-		this.handle = handle;
+		super(MinecraftReflection.getDataWatcherClass());
+		setHandle(handle);
 		initialize();
 	}
 	
@@ -150,10 +145,10 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 		Class<?> dataWatcher = MinecraftReflection.getDataWatcherClass();
 		
 		try {
-			if (createDataWatcherConstructor == null)
-				createDataWatcherConstructor = dataWatcher.getConstructor(MinecraftReflection.getEntityClass());
+			if (CREATE_DATA_WATCHER_CONSTRUCTOR == null)
+				CREATE_DATA_WATCHER_CONSTRUCTOR = dataWatcher.getConstructor(MinecraftReflection.getEntityClass());
 			
-			return createDataWatcherConstructor.newInstance(
+			return CREATE_DATA_WATCHER_CONSTRUCTOR.newInstance(
 					BukkitUnwrapper.getInstance().unwrapItem(entity)
 			);
 		} catch (Exception e) {
@@ -190,14 +185,6 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 		}
 	}
 	
-	/**
-	 * Retrieves the underlying data watcher.
-	 * @return The underlying data watcher.
-	 */
-	public Object getHandle() {
-		return handle;
-	}
-	
 	/**
 	 * Retrieve the ID of a given type, if it's allowed to be watched.
 	 * @return The ID, or NULL if it cannot be watched.
@@ -205,7 +192,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	 */
 	public static Integer getTypeID(Class<?> clazz) throws FieldAccessException {
 		initialize();
-		return typeMap.get(WrappedWatchableObject.getUnwrappedType(clazz));
+		return TYPE_MAP.get(WrappedWatchableObject.getUnwrappedType(clazz));
 	}
 	
 	/**
@@ -216,7 +203,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	public static Class<?> getTypeClass(int id) throws FieldAccessException {
 		initialize();
 		
-		for (Map.Entry<Class<?>, Integer> entry : typeMap.entrySet()) {
+		for (Map.Entry<Class<?>, Integer> entry : TYPE_MAP.entrySet()) {
 			if (Objects.equal(entry.getValue(), id)) {
 				return entry.getKey();
 			}
@@ -462,7 +449,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	    	if (watchable != null) {
 	    		new WrappedWatchableObject(watchable).setValue(newValue, update);
 	    	} else {
-	    		createKeyValueMethod.invoke(handle, index, WrappedWatchableObject.getUnwrapped(newValue));
+	    		CREATE_KEY_VALUE_METHOD.invoke(handle, index, WrappedWatchableObject.getUnwrapped(newValue));
 	    	}
 	    	
 	    	// Handle invoking the method
@@ -479,9 +466,9 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
     
     private Object getWatchedObject(int index) throws FieldAccessException {
     	// We use the get-method first and foremost
-    	if (getKeyValueMethod != null) {
+    	if (GET_KEY_VALUE_METHOD != null) {
 			try {
-				return getKeyValueMethod.invoke(handle, index);
+				return GET_KEY_VALUE_METHOD.invoke(handle, index);
 			} catch (Exception e) {
 				throw new FieldAccessException("Cannot invoke get key method for index " + index, e);
 			}
@@ -506,8 +493,8 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	    	// Cache the read write lock
 	    	if (readWriteLock != null)
 	    		return readWriteLock;
-	    	else if (readWriteLockField != null)
-	    		return readWriteLock = (ReadWriteLock) FieldUtils.readField(readWriteLockField, handle, true);
+	    	else if (READ_WRITE_LOCK_FIELD != null)
+	    		return readWriteLock = (ReadWriteLock) FieldUtils.readField(READ_WRITE_LOCK_FIELD, handle, true);
 	    	else
 	    		return readWriteLock = new ReentrantReadWriteLock();
     	} catch (IllegalAccessException e) {
@@ -524,7 +511,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	protected Map<Integer, Object> getWatchableObjectMap() throws FieldAccessException {
 		if (watchableObjects == null) {
 			try {
-				watchableObjects = (Map<Integer, Object>) FieldUtils.readField(valueMapField, handle, true);
+				watchableObjects = (Map<Integer, Object>) FieldUtils.readField(VALUE_MAP_FIELD, handle, true);
 			} catch (IllegalAccessException e) {
 				throw new FieldAccessException("Cannot read watchable object field.", e);
 			}
@@ -539,14 +526,14 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	 * @throws FieldAccessException Reflection failed.
 	 */
 	public static WrappedDataWatcher getEntityWatcher(Entity entity) throws FieldAccessException {
-		if (entityDataField == null)
-			entityDataField = FuzzyReflection.fromClass(MinecraftReflection.getEntityClass(), true).
+		if (ENTITY_DATA_FIELD == null)
+			ENTITY_DATA_FIELD = FuzzyReflection.fromClass(MinecraftReflection.getEntityClass(), true).
 				getFieldByType("datawatcher", MinecraftReflection.getDataWatcherClass());
 
 		BukkitUnwrapper unwrapper = new BukkitUnwrapper();
 		
 		try {
-			Object nsmWatcher = FieldUtils.readField(entityDataField, unwrapper.unwrapItem(entity), true);
+			Object nsmWatcher = FieldUtils.readField(ENTITY_DATA_FIELD, unwrapper.unwrapItem(entity), true);
 			
 			if (nsmWatcher != null) 
 				return new WrappedDataWatcher(nsmWatcher);
@@ -564,8 +551,8 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 	@SuppressWarnings("unchecked")
 	private static void initialize() throws FieldAccessException {
 		// This method should only be run once, even if an exception is thrown
-		if (!hasInitialized)
-			hasInitialized = true;
+		if (!HAS_INITIALIZED)
+			HAS_INITIALIZED = true;
 		else
 			return;
 		
@@ -575,27 +562,27 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 			if (Modifier.isStatic(lookup.getModifiers())) {
 				// This must be the type map
 				try {
-					typeMap = (Map<Class<?>, Integer>) FieldUtils.readStaticField(lookup, true);
+					TYPE_MAP = (Map<Class<?>, Integer>) FieldUtils.readStaticField(lookup, true);
 				} catch (IllegalAccessException e) {
 					throw new FieldAccessException("Cannot access type map field.", e);
 				}
 				
 			} else {
 				// If not, then we're probably dealing with the value map
-				valueMapField = lookup;
+				VALUE_MAP_FIELD = lookup;
 			}
 		}
 		
 		try {
-			readWriteLockField = fuzzy.getFieldByType("readWriteLock", ReadWriteLock.class);
+			READ_WRITE_LOCK_FIELD = fuzzy.getFieldByType("readWriteLock", ReadWriteLock.class);
 		} catch (IllegalArgumentException e) {
 			// It's not a big deal
 		}
 		
 		// Check for the entity field as well
 		if (MinecraftReflection.isUsingNetty()) {
-			entityField = fuzzy.getFieldByType("entity", MinecraftReflection.getEntityClass());
-			entityField.setAccessible(true);
+			ENTITY_FIELD = fuzzy.getFieldByType("entity", MinecraftReflection.getEntityClass());
+			ENTITY_FIELD.setAccessible(true);
 		}
 		initializeMethods(fuzzy);
 	}
@@ -606,9 +593,9 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 		
 		// Load the get-method
 		try {
-			getKeyValueMethod = fuzzy.getMethodByParameters(
+			GET_KEY_VALUE_METHOD = fuzzy.getMethodByParameters(
 					"getWatchableObject", MinecraftReflection.getWatchableObjectClass(), new Class[] { int.class });
-			getKeyValueMethod.setAccessible(true);
+			GET_KEY_VALUE_METHOD.setAccessible(true);
 			
 		} catch (IllegalArgumentException e) {
 			// Use the fallback method
@@ -616,18 +603,18 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 		
 		for (Method method : candidates) {
 			if (!method.getName().startsWith("watch")) {
-				createKeyValueMethod = method;
+				CREATE_KEY_VALUE_METHOD = method;
 			} else {
-				updateKeyValueMethod = method;
+				UPDATE_KEY_VALUE_METHOD = method;
 			}
 		}
 		
 		// Did we succeed?
-		if (updateKeyValueMethod == null || createKeyValueMethod == null) {
+		if (UPDATE_KEY_VALUE_METHOD == null || CREATE_KEY_VALUE_METHOD == null) {
 			// Go by index instead
 			if (candidates.size() > 1) {
-				createKeyValueMethod = candidates.get(0);
-				updateKeyValueMethod = candidates.get(1);
+				CREATE_KEY_VALUE_METHOD = candidates.get(0);
+				UPDATE_KEY_VALUE_METHOD = candidates.get(1);
 			} else {
 				throw new IllegalStateException("Unable to find create and update watchable object. Update ProtocolLib.");
 			}
@@ -643,8 +630,8 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 				}
 			} catch (Exception e) {
 				// Nope
-				updateKeyValueMethod = candidates.get(0);
-				createKeyValueMethod = candidates.get(1);
+				UPDATE_KEY_VALUE_METHOD = candidates.get(0);
+				CREATE_KEY_VALUE_METHOD = candidates.get(1);
 			}
 		}
 	}
@@ -709,7 +696,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 			throw new IllegalStateException("This method is only supported on 1.7.2 and above.");
 		
 		try {
-			return (Entity) MinecraftReflection.getBukkitEntity(entityField.get(handle));
+			return (Entity) MinecraftReflection.getBukkitEntity(ENTITY_FIELD.get(handle));
 		} catch (Exception e) {
 			throw new RuntimeException("Unable to retrieve entity.", e);
 		}
@@ -726,7 +713,7 @@ public class WrappedDataWatcher implements Iterable<WrappedWatchableObject> {
 			throw new IllegalStateException("This method is only supported on 1.7.2 and above.");
 		
 		try {
-			entityField.set(handle, BukkitUnwrapper.getInstance().unwrapItem(entity));
+			ENTITY_FIELD.set(handle, BukkitUnwrapper.getInstance().unwrapItem(entity));
 		} catch (Exception e) {
 			throw new RuntimeException("Unable to set entity.", e);
 		}

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedGameProfile.java

@@ -6,16 +6,11 @@ import net.minecraft.util.com.mojang.authlib.GameProfile;
  * Represents a wrapper for a game profile.
  * @author Kristian
  */
-public class WrappedGameProfile {
-	private GameProfile profile;
-	
+public class WrappedGameProfile extends AbstractWrapper {
 	// Profile from a handle
 	private WrappedGameProfile(Object profile) {
-		if (profile == null)
-			throw new IllegalArgumentException("Profile cannot be NULL.");
-		if (!(profile instanceof GameProfile)) 
-			throw new IllegalArgumentException(profile + " is not a GameProfile");
-		this.profile = (GameProfile) profile;
+		super(GameProfile.class);
+		setHandle(profile);
 	}
 	
 	/**
@@ -35,20 +30,12 @@ public class WrappedGameProfile {
 		return new WrappedGameProfile(handle);
 	}
 
-	/**
-	 * Retrieve the underlying game profile.
-	 * @return The profile.
-	 */
-	public Object getHandle() {
-		return profile;
-	}
-
 	/**
 	 * Retrieve the UUID of the player.
 	 * @return The UUID of the player, or NULL if not computed.
 	 */
 	public String getId() {
-		return profile.getId();
+		return getProfile().getId();
 	}
 
 	/**
@@ -56,7 +43,11 @@ public class WrappedGameProfile {
 	 * @return The player name.
 	 */
 	public String getName() {
-		return profile.getName();
+		return getProfile().getName();
+	}
+	
+	private GameProfile getProfile() {
+		return (GameProfile) handle;
 	}
 
 	/**
@@ -82,12 +73,12 @@ public class WrappedGameProfile {
 	 * @return TRUE if it does, FALSE otherwise.
 	 */
 	public boolean isComplete() {
-		return profile.isComplete();
+		return getProfile().isComplete();
 	}
 	
 	@Override
 	public int hashCode() {
-		return profile.hashCode();
+		return getProfile().hashCode();
 	}
 	
 	@Override
@@ -97,7 +88,7 @@ public class WrappedGameProfile {
 		
 		if (obj instanceof WrappedGameProfile) {
 			WrappedGameProfile other = (WrappedGameProfile) obj;
-			return profile.equals(other.profile);
+			return getProfile().equals(other.getProfile());
 		}
 		return false;
 	}

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedIntHashMap.java

@@ -15,21 +15,18 @@ import com.google.common.base.Preconditions;
  * Represents a wrapper for the internal IntHashMap in Minecraft.
  * @author Kristian
  */
-public class WrappedIntHashMap {
-	private static final Class<?> INT_HASH_MAP = MinecraftReflection.getIntHashMapClass();
-	
+public class WrappedIntHashMap extends AbstractWrapper {
 	private static Method PUT_METHOD;
 	private static Method GET_METHOD;
 	private static Method REMOVE_METHOD;
 	
-	private Object handle;
-	
 	/**
 	 * Construct an IntHashMap wrapper around an instance.
 	 * @param handle - the NMS instance.
 	 */
 	private WrappedIntHashMap(Object handle) {		
-		this.handle = handle;
+		super(MinecraftReflection.getIntHashMapClass());
+		setHandle(handle);
 	}
 	
 	/**
@@ -38,7 +35,7 @@ public class WrappedIntHashMap {
 	 */
 	public static WrappedIntHashMap newMap() {
 		try {
-			return new WrappedIntHashMap(INT_HASH_MAP.newInstance());
+			return new WrappedIntHashMap(MinecraftReflection.getIntHashMapClass().newInstance());
 		} catch (Exception e) {
 			throw new RuntimeException("Unable to construct IntHashMap.", e);
 		}
@@ -51,10 +48,6 @@ public class WrappedIntHashMap {
 	 * @throws IllegalArgumentException If the handle is not an IntHasMap.
 	 */
 	public static WrappedIntHashMap fromHandle(@Nonnull Object handle) {
-		Preconditions.checkNotNull(handle, "handle cannot be NULL");
-		Preconditions.checkState(MinecraftReflection.isIntHashMap(handle), 
-				"handle is a " + handle.getClass() + ", not an IntHashMap.");
-
 		return new WrappedIntHashMap(handle);
 	}
 	
@@ -138,7 +131,7 @@ public class WrappedIntHashMap {
 	private void initializePutMethod() {
 		if (PUT_METHOD == null) {
 			// Fairly straight forward
-			PUT_METHOD = FuzzyReflection.fromClass(INT_HASH_MAP).getMethod(
+			PUT_METHOD = FuzzyReflection.fromClass(MinecraftReflection.getIntHashMapClass()).getMethod(
 				FuzzyMethodContract.newBuilder().
 					banModifier(Modifier.STATIC).
 					parameterCount(2).
@@ -154,7 +147,7 @@ public class WrappedIntHashMap {
 			String expected = "hello";
 					
 			// Determine which method to trust
-			for (Method method : FuzzyReflection.fromClass(INT_HASH_MAP).
+			for (Method method : FuzzyReflection.fromClass(MinecraftReflection.getIntHashMapClass()).
 					getMethodListByParameters(Object.class, new Class<?>[] { int.class })) {
 				
 				// Initialize a value
@@ -183,12 +176,4 @@ public class WrappedIntHashMap {
 				throw new IllegalStateException("Unable to find appropriate GET_METHOD for IntHashMap.");
 		}
 	}
-
-	/**
-	 * Retrieve the underlying IntHashMap object.
-	 * @return The underlying object.
-	 */
-	public Object getHandle() {
-		return handle;
-	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/wrappers/WrappedWatchableObject.java

@@ -33,8 +33,7 @@ import com.google.common.base.Objects;
  * 
  * @author Kristian
  */
-public class WrappedWatchableObject {
-
+public class WrappedWatchableObject extends AbstractWrapper {
 	// Whether or not the reflection machinery has been initialized
 	private static boolean hasInitialized;
 	
@@ -47,7 +46,6 @@ public class WrappedWatchableObject {
 	// The watchable object class type
 	private static Class<?> watchableObjectClass;
 	
-	protected Object handle;
 	protected StructureModifier<Object> modifier;
 	
 	// Type of the stored value
@@ -58,6 +56,7 @@ public class WrappedWatchableObject {
 	 * @param handle - the raw watchable object to wrap.
 	 */
 	public WrappedWatchableObject(Object handle) {
+		super(MinecraftReflection.getWatchableObjectClass());
 		load(handle);
 	}
 	
@@ -67,6 +66,8 @@ public class WrappedWatchableObject {
 	 * @param value - non-null value of specific types.
 	 */
 	public WrappedWatchableObject(int index, Object value) {
+		super(MinecraftReflection.getWatchableObjectClass());
+		
 		if (value == null)
 			throw new IllegalArgumentException("Value cannot be NULL.");
 		
@@ -107,14 +108,6 @@ public class WrappedWatchableObject {
 		}
 	}
 	
-	/**
-	 * Retrieves the underlying watchable object.
-	 * @return The underlying watchable object.
-	 */
-	public Object getHandle() {
-		return handle;
-	}
-	
 	/**
 	 * Initialize reflection machinery.
 	 */

ProtocolLib/src/test/java/com/comphenix/protocol/wrappers/WrappedChunkCoordinateTest.java

@@ -0,0 +1,24 @@
+package com.comphenix.protocol.wrappers;
+
+import static org.junit.Assert.*;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.comphenix.protocol.BukkitInitialization;
+
+public class WrappedChunkCoordinateTest {
+	@BeforeClass
+	public static void initializeBukkit() throws IllegalAccessException {
+		BukkitInitialization.initializePackage();
+	}
+	
+	@Test
+	public void test() {
+		WrappedChunkCoordinate coordinate = new WrappedChunkCoordinate(1, 2, 3);
+		
+		assertEquals(1, coordinate.getX());
+		assertEquals(2, coordinate.getY());
+		assertEquals(3, coordinate.getZ());
+	}
+}

ProtocolLib/src/test/java/com/comphenix/protocol/wrappers/WrappedIntHashMapTest.java

@@ -0,0 +1,24 @@
+package com.comphenix.protocol.wrappers;
+
+import static org.junit.Assert.*;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import com.comphenix.protocol.BukkitInitialization;
+
+public class WrappedIntHashMapTest {
+	@BeforeClass
+	public static void initializeBukkit() throws IllegalAccessException {
+		BukkitInitialization.initializePackage();
+	}
+	
+	@Test
+	public void testIntMap() {
+		WrappedIntHashMap test = WrappedIntHashMap.newMap();
+		test.put(1, "hello");
+		
+		assertNull(test.get(0));
+		assertEquals(test.get(1), "hello");
+	}
+}