114 lines
3.4 KiB
Java
114 lines
3.4 KiB
Java
/*
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* ProtocolLib - Bukkit server library that allows access to the Minecraft protocol.
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* Copyright (C) 2012 Kristian S. Stangeland
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with this program;
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* if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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package com.comphenix.protocol.injector;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.Collection;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import com.comphenix.protocol.injector.PacketConstructor.Unwrapper;
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import com.comphenix.protocol.reflect.instances.DefaultInstances;
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/**
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* Represents an object capable of converting wrapped Bukkit objects into NMS objects.
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* <p>
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* Typical conversions include:
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* <ul>
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* <li>org.bukkit.entity.Player -> net.minecraft.server.EntityPlayer</li>
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* <li>org.bukkit.World -> net.minecraft.server.WorldServer</li>
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* </ul>
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*
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* @author Kristian
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*/
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public class BukkitUnwrapper implements Unwrapper {
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private static Map<Class<?>, Method> cache = new ConcurrentHashMap<Class<?>, Method>();
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@SuppressWarnings("unchecked")
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@Override
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public Object unwrapItem(Object wrappedObject) {
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// Special case
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if (wrappedObject instanceof Collection) {
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return handleCollection((Collection<Object>) wrappedObject);
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}
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Class<?> currentClass = wrappedObject.getClass();
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Method cachedMethod = initializeCache(currentClass);
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try {
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// Retrieve the handle
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if (cachedMethod != null)
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return cachedMethod.invoke(wrappedObject);
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else
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return null;
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} catch (IllegalArgumentException e) {
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// Impossible
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return null;
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} catch (IllegalAccessException e) {
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return null;
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} catch (InvocationTargetException e) {
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// This is REALLY bad
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throw new RuntimeException("Minecraft error.", e);
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}
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}
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private Object handleCollection(Collection<Object> wrappedObject) {
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@SuppressWarnings("unchecked")
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Collection<Object> copy = DefaultInstances.DEFAULT.getDefault(wrappedObject.getClass());
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if (copy != null) {
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// Unwrap every element
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for (Object element : wrappedObject) {
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copy.add(unwrapItem(element));
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}
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return copy;
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} else {
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// Impossible
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return null;
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}
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}
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private Method initializeCache(Class<?> type) {
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// See if we're already determined this
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if (cache.containsKey(type)) {
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// We will never remove from the cache, so this ought to be thread safe
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return cache.get(type);
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}
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try {
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Method find = type.getMethod("getHandle");
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// It's thread safe, as getMethod should return the same handle
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cache.put(type, find);
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return find;
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} catch (SecurityException e) {
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return null;
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} catch (NoSuchMethodException e) {
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return null;
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}
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}
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}
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