packetencoderchain.java

银行项目为后台ｓｏｃｋｅｔ通信写的程序

/****************************************************************************
 * Package		: com.ecSolutions.ecAppServer.server.encoder
 * File			: PacketEncoderChain.java
 * Create Date  : 2007-7-20
 * Author		: Steven Chen
 * 
 * Copyright(C) 2006 ecSolutions(shanghai) Co.,Limited.All Rights Reserved.
 *			
 ***************************************************************************/
package com.ecSolutions.ecAppServer.server.encoder;

import java.util.Collection;
import java.util.Iterator;

import com.ecSolutions.ecAppServer.server.Packet;
import com.ecSolutions.ecAppServer.server.PacketEncoder;
import com.ecSolutions.ecAppServer.server.Session;
import edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList;

/**
 * <code>PacketEncoder</code> chain.
 * 
 * @author Steven Chen
 * @version $Id: PacketEncoderChain.java,v 1.2 2007/07/26 03:19:40 stevenchen Exp $
 */
public class PacketEncoderChain implements PacketEncoder {

    private final Collection chain = new CopyOnWriteArrayList();

    public PacketEncoderChain addPacketEncoder(PacketEncoder encoder) {
        if (encoder != null)
            chain.add(encoder);
        return this;
    }

    public PacketEncoderChain removePacketEncoder(PacketEncoder encoder) {
        chain.remove(encoder);
        return this;
    }

    public Packet encode(Session session, Object obj) throws Exception {
        for (Iterator iter = chain.iterator(); iter.hasNext();) {
            PacketEncoder encoder = (PacketEncoder) iter.next();
            Packet packet = encoder.encode(session, obj);
            if (packet != null)
                return packet;
        }
        return null;
    }
}