iparser.java

java写的qq代码实现qq的部分功能

/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma <[e-mail]>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package edu.tsinghua.lumaqq.qq.packets;

import java.nio.ByteBuffer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import edu.tsinghua.lumaqq.qq.PacketParseException;
import edu.tsinghua.lumaqq.qq.beans.QQUser;

/**
 * 包解析器
 * 
 * @author luma
 */
public interface IParser {
    // Log对象
    static Log log = LogFactory.getLog(IParser.class);
    
	/**
	 * 判断此parser是否可以处理这个包，判断不能影响到buf的指针位置
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @return
	 * 		true表示这个parser可以处理这个包
	 */
	public boolean accept(ByteBuffer buf);
	
	/**
	 * @return
	 * 		包的总长度
	 */
	public int getLength();
	
	/**
	 * 从buf当前位置解析出一个输入包对象，解析完毕后指针位于length之后
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @param length
	 * 		包长度
	 * @param user
	 * 		QQ用户对象
	 * @return
	 * 		InPacket子类，如果解析不了返回null
	 * @throws PacketParseException
	 */
	public InPacket parseIncoming(ByteBuffer buf, int length, QQUser user) throws PacketParseException;
	
	/**
	 * 从buf当前位置解析出一个输出包对象，解析完毕后指针位于length之后
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @param length
	 * 		包长度
	 * @param user
	 * 		QQ用户对象
	 * @return
	 * 		OutPacket子类，如果解析不了，返回null
	 * @throws PacketParseException
	 */
	public OutPacket parseOutcoming(ByteBuffer buf, int length, QQUser user) throws PacketParseException;
	
	/**
	 * 得到buf中下一个包的hash值
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @return
	 * 		hash值
	 */
	public int getHash(ByteBuffer buf);
	
	/**
	 * 判断buf中的包是否是输入包，判断不能改变buf的指针位置
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @return
	 * 		true表示是输入包
	 */
	public boolean isIncoming(ByteBuffer buf);
	
	/**
	 * 判断buf中的包是否是UDP方式包，判断不能改变buf的指针位置
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @return
	 * 		true表示是UDP方式包
	 */
	public boolean isUdp(ByteBuffer buf);
	
	/**
	 * 检查包是否重复
	 * 
	 * @param buf
	 * 		ByteBuffer
	 * @return
	 * 		true表示重复
	 */
	public boolean isDuplicated(ByteBuffer buf);
	
	/**
	 * @return
	 * 		true表示即使这个包是重复包也要回复
	 */
	public boolean isDuplicatedNeedReply();
}