Improve WrappedDataWatcher hasIndex performance

Use the map to check for indices instead of getting the object

Addresses #850

Author: dmulloy2

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

@@ -243,7 +243,7 @@ public WrappedWatchableObject remove(int index) {
 	 * @return True if it does, false if not
 	 */
 	public boolean hasIndex(int index) {
-		return getObject(index) != null;
+		return getMap().containsKey(index);
 	}
 
 	/**
@@ -388,7 +388,7 @@ public Object getObject(WrappedDataWatcherObject object) {
 	 * @param value New value
 	 * @param update Whether or not to inform the client
 	 * 
-	 * @see {@link #setObject(WrappedDataWatcherObject, Object, boolean)}
+	 * @see WrappedDataWatcher#setObject(WrappedDataWatcherObject, Object, boolean)
 	 * @throws IllegalArgumentException in 1.9 and up if there isn't already an
 	 * 		object at this index
 	 */
@@ -415,7 +415,7 @@ public void setObject(int index, Object value) {
 	 * @param value New value
 	 * @param update Whether or not to inform the client
 	 * 
-	 * @see {@link #setObject(WrappedDataWatcherObject, Object)}
+	 * @see WrappedDataWatcher#setObject(WrappedDataWatcherObject, Object)
 	 */
 	public void setObject(int index, Serializer serializer, Object value, boolean update) {
 		setObject(new WrappedDataWatcherObject(index, serializer), value, update);
@@ -435,7 +435,7 @@ public void setObject(int index, Serializer serializer, Object value) {
 	 * @param value New value
 	 * @param update Whether or not to inform the client
 	 * 
-	 * @see {@link #setObject(int, Object, boolean)}
+	 * @see WrappedDataWatcher#setObject(int, Object, boolean)
 	 */
 	public void setObject(int index, WrappedWatchableObject value, boolean update) {
 		setObject(index, value.getRawValue(), update);

src/test/java/com/comphenix/protocol/wrappers/WrappedDataWatcherTest.java

@@ -40,7 +40,7 @@ public class WrappedDataWatcherTest {
 
 	@BeforeClass
 	public static void prepare() {
-		BukkitInitialization.initializePackage();
+		BukkitInitialization.initializeItemMeta();
 	}
 
 	@Test
@@ -94,4 +94,14 @@ public void testSerializers() {
 		// assertNull(Registry.get(ItemStack.class, false));
 		assertNotNull(Registry.get(UUID.class, true));
 	}
+
+	@Test
+	public void testHasIndex() {
+		WrappedDataWatcher watcher = new WrappedDataWatcher();
+		Serializer serializer = Registry.get(Integer.class);
+
+		assertFalse(watcher.hasIndex(0));
+		watcher.setObject(0, serializer, 1);
+		assertTrue(watcher.hasIndex(0));
+	}
 }