Add wrapper for villager data

Fixes #637

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

@@ -82,6 +82,7 @@ public class BukkitCloner implements Cloner {
 		fromWrapper(MinecraftReflection::getIChatBaseComponentClass, WrappedChatComponent::fromHandle);
 		fromManual(ComponentConverter::getBaseComponentArrayClass, source ->
 				ComponentConverter.clone((BaseComponent[]) source));
+		fromWrapper(WrappedVillagerData::getNmsClass, WrappedVillagerData::fromHandle);
 	}
 
 	private Function<Object, Object> findCloner(Class<?> type) {

src/main/java/com/comphenix/protocol/reflect/cloning/ImmutableDetector.java

@@ -60,19 +60,24 @@ public class ImmutableDetector implements Cloner {
 	static {
 		add(MinecraftReflection::getGameProfileClass);
 		add(MinecraftReflection::getDataWatcherSerializerClass);
-		add(() -> MinecraftReflection.getMinecraftClass("SoundEffect"));
 		add(MinecraftReflection::getBlockClass);
 		add(MinecraftReflection::getItemClass);
+		add("SoundEffect");
 
 		if (MinecraftVersion.atOrAbove(MinecraftVersion.AQUATIC_UPDATE)) {
-			add(() -> MinecraftReflection.getMinecraftClass("Particle"));
 			add(MinecraftReflection::getFluidTypeClass);
 			add(MinecraftReflection::getParticleTypeClass);
+			add("Particle");
 		}
 
 		if (MinecraftVersion.atOrAbove(MinecraftVersion.VILLAGE_UPDATE)) {
-			add(() -> MinecraftReflection.getMinecraftClass("EntityTypes"));
+			add("EntityTypes");
+			add("VillagerType");
+			add("VillagerProfession");
 		}
+
+		// TODO automatically detect the technically-not-an-enum enums that Mojang is so fond of
+		// Would also probably go in tandem with having the FieldCloner use this
 	}
 
 	private static void add(Supplier<Class<?>> getClass) {
@@ -83,6 +88,15 @@ public class ImmutableDetector implements Cloner {
 			}
 		} catch (RuntimeException ignored) { }
 	}
+
+	private static void add(String className) {
+		try {
+			Class<?> clazz = MinecraftReflection.getMinecraftClass(className);
+			if (clazz != null) {
+				immutableNMS.add(clazz);
+			}
+		} catch (RuntimeException ignored) { }
+	}
 	
 	@Override
 	public boolean canClone(Object source) {

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

@@ -1,19 +1,22 @@
 package com.comphenix.protocol.wrappers;
 
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Locale;
+import java.util.Map;
+
 import com.comphenix.protocol.PacketType;
 import com.comphenix.protocol.PacketType.Protocol;
 import com.comphenix.protocol.ProtocolLogger;
 import com.comphenix.protocol.reflect.EquivalentConverter;
 import com.comphenix.protocol.reflect.FuzzyReflection;
+import com.comphenix.protocol.reflect.accessors.Accessors;
 import com.comphenix.protocol.utility.MinecraftReflection;
 import com.google.common.collect.Maps;
 
+import org.apache.commons.lang.Validate;
 import org.bukkit.GameMode;
 
-import java.util.HashMap;
-import java.util.Locale;
-import java.util.Map;
-
 /**
  * Represents a generic enum converter.
  * @author Kristian
@@ -693,4 +696,98 @@ public abstract class EnumWrappers {
 			this.genericType = genericType;
 		}
 	}
+
+	/**
+	 * Used for classes where it's an enum in everything but name
+	 * @param <T> Generic type
+	 */
+	public static class FauxEnumConverter<T extends Enum<T>> implements EquivalentConverter<T> {
+		private final Class<T> specificClass;
+		private final Class<?> genericClass;
+		private final Map<Object, T> lookup;
+
+		public FauxEnumConverter(Class<T> specific, Class<?> generic) {
+			Validate.notNull(specific,"specific class cannot be null");
+			Validate.notNull(generic,"generic class cannot be null");
+
+			this.specificClass = specific;
+			this.genericClass = generic;
+			this.lookup = new HashMap<>();
+		}
+
+		@Override
+		public Object getGeneric(T specific) {
+			Validate.notNull(specific, "specific object cannot be null");
+
+			return Accessors
+					.getFieldAccessor(genericClass, specific
+							.name(), false)
+					.get(null);
+		}
+
+		@Override
+		public T getSpecific(Object generic) {
+			Validate.notNull(generic, "generic object cannot be null");
+
+			return lookup.computeIfAbsent(generic, x -> {
+				for (Field field : genericClass.getFields()) {
+					try {
+						if (!field.isAccessible()) {
+							field.setAccessible(true);
+						}
+
+						if (field.get(null) == generic) {
+							return Enum.valueOf(specificClass, field.getName().toUpperCase());
+						}
+					} catch (ReflectiveOperationException ignored) { }
+				}
+
+				throw new IllegalArgumentException("Could not find ProtocolLib wrapper for " + generic);
+			});
+		}
+
+		@Override
+		public Class<T> getSpecificType() {
+			return specificClass;
+		}
+	}
+
+	public static class IndexedEnumConverter<T extends Enum<T>> implements EquivalentConverter<T> {
+		private Class<T> specificClass;
+		private Class<?> genericClass;
+
+		public IndexedEnumConverter(Class<T> specificClass, Class<?> genericClass) {
+			this.specificClass = specificClass;
+			this.genericClass = genericClass;
+		}
+
+		@Override
+		public Object getGeneric(T specific) {
+			int ordinal = specific.ordinal();
+			for (Object elem : genericClass.getEnumConstants()) {
+				if (((Enum<?>) elem).ordinal() == ordinal) {
+					return elem;
+				}
+			}
+
+			return null;
+		}
+
+		@Override
+		public T getSpecific(Object generic) {
+			int ordinal = ((Enum<?>) generic).ordinal();
+			for (T elem : specificClass.getEnumConstants()) {
+				if (elem.ordinal() == ordinal) {
+					return elem;
+				}
+			}
+
+			return null;
+		}
+
+		@Override
+		public Class<T> getSpecificType() {
+			return specificClass;
+		}
+	}
 }

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

@@ -0,0 +1,68 @@
+package com.comphenix.protocol.wrappers;
+
+import com.comphenix.protocol.reflect.EquivalentConverter;
+import com.comphenix.protocol.reflect.StructureModifier;
+import com.comphenix.protocol.reflect.accessors.Accessors;
+import com.comphenix.protocol.utility.MinecraftReflection;
+
+public class WrappedVillagerData extends AbstractWrapper implements ClonableWrapper {
+    private static final Class<?> NMS_CLASS = MinecraftReflection.getMinecraftClass("VillagerData");
+    private static final Class<?> TYPE_CLASS = MinecraftReflection.getMinecraftClass("VillagerType");
+    private static final Class<?> PROF_CLASS = MinecraftReflection.getMinecraftClass("VillagerProfession");
+
+    private static final EquivalentConverter<Type> TYPE_CONVERTER = new EnumWrappers.FauxEnumConverter<>(Type.class, TYPE_CLASS);
+    private static final EquivalentConverter<Profession> PROF_CONVERTER = new EnumWrappers.FauxEnumConverter<>(Profession.class, PROF_CLASS);
+
+    public enum Type {
+        DESERT, JUNGLE, PLAINS, SAVANNA, SNOW, SWAMP, TAIGA;
+    }
+
+    public enum Profession {
+        NONE, ARMORER, BUTCHER, CARTOGRAPHER, CLERIC, FARMER, FISHERMAN,
+        FLETCHER, LEATHERWORKER, LIBRARIAN, MASON, NITWIT, SHEPHERD,
+        TOOLSMITH, WEAPONSMITH;
+    }
+
+    private StructureModifier<Object> modifier;
+
+    private WrappedVillagerData(Object handle) {
+        super(NMS_CLASS);
+        setHandle(handle);
+
+        modifier = new StructureModifier<>(NMS_CLASS).withTarget(handle);
+    }
+
+    public static WrappedVillagerData fromHandle(Object handle) {
+        return new WrappedVillagerData(handle);
+    }
+
+    public static WrappedVillagerData fromValues(Type type, Profession profession, int level) {
+        Object genericType = TYPE_CONVERTER.getGeneric(type);
+        Object genericProf = PROF_CONVERTER.getGeneric(profession);
+
+        Object handle = Accessors.getConstructorAccessor(NMS_CLASS, TYPE_CLASS, PROF_CLASS, int.class)
+                .invoke(genericType, genericProf, level);
+        return fromHandle(handle);
+    }
+
+    public static Class<?> getNmsClass() {
+        return NMS_CLASS;
+    }
+
+    public int getLevel() {
+        return modifier.<Integer>withType(int.class).read(0);
+    }
+
+    public Type getType() {
+        return modifier.withType(TYPE_CLASS, TYPE_CONVERTER).read(0);
+    }
+
+    public Profession getProfession() {
+        return modifier.withType(PROF_CLASS, PROF_CONVERTER).read(0);
+    }
+
+    @Override
+    public WrappedVillagerData deepClone() {
+        return WrappedVillagerData.fromValues(getType(), getProfession(), getLevel());
+    }
+}

src/test/java/com/comphenix/protocol/events/PacketContainerTest.java

@@ -535,7 +535,9 @@ public class PacketContainerTest {
 									"String"),
 							new WrappedWatchableObject(new WrappedDataWatcherObject(0, Registry.get(Float.class)), 1.0F),
 							new WrappedWatchableObject(new WrappedDataWatcherObject(0, Registry.getChatComponentSerializer(true)),
-							                           com.google.common.base.Optional.of(ComponentConverter.fromBaseComponent(TEST_COMPONENT).getHandle()))
+							                           com.google.common.base.Optional.of(ComponentConverter.fromBaseComponent(TEST_COMPONENT).getHandle())),
+							new WrappedWatchableObject(new WrappedDataWatcherObject(0, Registry.get(VillagerData.class)),
+							                           new VillagerData(VillagerType.SNOW, VillagerProfession.ARMORER, 69))
 					));
 				} else if (type == PacketType.Play.Server.CHAT) {
 					constructed.getChatComponents().write(0, ComponentConverter.fromBaseComponent(TEST_COMPONENT));