Rewrite BukkitCloner to be more dynamic, fix some NPEs

Fixes #66

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/cloning/BukkitCloner.java

@@ -1,4 +1,4 @@
-/*
+/**
  *  ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
  *  Copyright (C) 2012 Kristian S. Stangeland
  *
@@ -14,18 +14,19 @@
  *  if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  *  02111-1307 USA
  */
-
 package com.comphenix.protocol.reflect.cloning;
 
-import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
 
 import com.comphenix.protocol.reflect.EquivalentConverter;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.wrappers.BlockPosition;
 import com.comphenix.protocol.wrappers.BukkitConverters;
 import com.comphenix.protocol.wrappers.ChunkPosition;
 import com.comphenix.protocol.wrappers.WrappedDataWatcher;
 import com.comphenix.protocol.wrappers.WrappedServerPing;
-import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
 
 /**
  * Represents an object that can clone a specific list of Bukkit- and Minecraft-related objects.
@@ -34,35 +35,39 @@ import com.google.common.collect.Lists;
  */
 public class BukkitCloner implements Cloner {
 	// List of classes we support
-	private Class<?>[] clonableClasses;
+	private final Map<Integer, Class<?>> clonableClasses = Maps.newConcurrentMap();
 
 	public BukkitCloner() {
-		List<Class<?>> classes = Lists.newArrayList();
-		
-		classes.add(MinecraftReflection.getItemStackClass());
-		classes.add(MinecraftReflection.getDataWatcherClass());
+		addClass(0, MinecraftReflection.getItemStackClass());
+		addClass(1, MinecraftReflection.getDataWatcherClass());
 
 		// Try to add position classes
 		try {
-			classes.add(MinecraftReflection.getBlockPositionClass());
-		} catch (Throwable ex) { }
-
-		try {
-			classes.add(MinecraftReflection.getChunkPositionClass());
-		} catch (Throwable ex) { }
-
-		if (MinecraftReflection.isUsingNetty()) {
-			classes.add(MinecraftReflection.getServerPingClass());
+			addClass(2, MinecraftReflection.getBlockPositionClass());
+		} catch (Throwable ex) {
 		}
 
-		this.clonableClasses = classes.toArray(new Class<?>[0]);
+		try {
+			addClass(3, MinecraftReflection.getChunkPositionClass());
+		} catch (Throwable ex) {
+		}
+
+		if (MinecraftReflection.isUsingNetty()) {
+			addClass(4, MinecraftReflection.getServerPingClass());
+		}
+	}
+
+	private void addClass(int id, Class<?> clazz) {
+		if (clazz != null)
+			clonableClasses.put(id, clazz);
 	}
 
 	private int findMatchingClass(Class<?> type) {
 		// See if is a subclass of any of our supported superclasses
-		for (int i = 0; i < clonableClasses.length; i++) {
-			if (clonableClasses[i].isAssignableFrom(type))
-				return i;
+		for (Entry<Integer, Class<?>> entry : clonableClasses.entrySet()) {
+			if (entry.getValue().isAssignableFrom(type)) {
+				return entry.getKey();
+			}
 		}
 
 		return -1;
@@ -86,14 +91,17 @@ public class BukkitCloner implements Cloner {
 			case 0:
 				return MinecraftReflection.getMinecraftItemStack(MinecraftReflection.getBukkitItemStack(source).clone());
 			case 1:
-				EquivalentConverter<ChunkPosition> chunkConverter = ChunkPosition.getConverter();
-				return chunkConverter.getGeneric(clonableClasses[1], chunkConverter.getSpecific(source));
-			case 2:
 				EquivalentConverter<WrappedDataWatcher> dataConverter = BukkitConverters.getDataWatcherConverter();
-				return dataConverter.getGeneric(clonableClasses[2], dataConverter.getSpecific(source).deepClone());
+				return dataConverter.getGeneric(clonableClasses.get(1), dataConverter.getSpecific(source).deepClone());
+			case 2:
+				EquivalentConverter<BlockPosition> blockConverter = BlockPosition.getConverter();
+				return blockConverter.getGeneric(clonableClasses.get(2), blockConverter.getSpecific(source));
 			case 3:
+				EquivalentConverter<ChunkPosition> chunkConverter = ChunkPosition.getConverter();
+				return chunkConverter.getGeneric(clonableClasses.get(3), chunkConverter.getSpecific(source));
+			case 4:
 				EquivalentConverter<WrappedServerPing> serverConverter = BukkitConverters.getWrappedServerPingConverter();
-				return serverConverter.getGeneric(clonableClasses[3], serverConverter.getSpecific(source).deepClone());
+				return serverConverter.getGeneric(clonableClasses.get(4), serverConverter.getSpecific(source).deepClone());
 			default:
 				throw new IllegalArgumentException("Cannot clone objects of type " + source.getClass());
 		}