src/net/lightstone/msg/handler/HandlerLookupService.java

/*
 * Copyright (c) 2010-2011 Graham Edgecombe.
 *
 * This file is part of Lightstone.
 *
 * Lightstone is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Lightstone is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Lightstone.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.lightstone.msg.handler;

import java.util.HashMap;
import java.util.Map;

import net.lightstone.msg.ChatMessage;
import net.lightstone.msg.HandshakeMessage;
import net.lightstone.msg.IdentificationMessage;
import net.lightstone.msg.KickMessage;
import net.lightstone.msg.Message;
import net.lightstone.msg.PositionMessage;
import net.lightstone.msg.PositionRotationMessage;
import net.lightstone.msg.RotationMessage;

public final class HandlerLookupService {

	private static final Map<Class<? extends Message>, MessageHandler<?>> handlers = new HashMap<Class<? extends Message>, MessageHandler<?>>();

	static {
		try {
			bind(IdentificationMessage.class, IdentificationMessageHandler.class);
			bind(HandshakeMessage.class, HandshakeMessageHandler.class);
			bind(ChatMessage.class, ChatMessageHandler.class);
			bind(PositionMessage.class, PositionMessageHandler.class);
			bind(RotationMessage.class, RotationMessageHandler.class);
			bind(PositionRotationMessage.class, PositionRotationMessageHandler.class);
			bind(KickMessage.class, KickMessageHandler.class);
		} catch (Exception ex) {
			throw new ExceptionInInitializerError(ex);
		}
	}

	private static <T extends Message> void bind(Class<T> clazz, Class<? extends MessageHandler<T>> handlerClass) throws InstantiationException, IllegalAccessException {
		MessageHandler<T> handler = handlerClass.newInstance();
		handlers.put(clazz, handler);
	}

	@SuppressWarnings("unchecked")
	public static <T extends Message> MessageHandler<T> find(Class<T> clazz) {
		return (MessageHandler<T>) handlers.get(clazz);
	}

	private HandlerLookupService() {

	}

}