/*
* Copyright 2004-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sf.cindy.encoder;
import java.util.Collection;
import java.util.Iterator;
import net.sf.cindy.Packet;
import net.sf.cindy.PacketEncoder;
import net.sf.cindy.Session;
import edu.emory.mathcs.backport.java.util.concurrent.CopyOnWriteArrayList;
/**
* <code>PacketEncoder</code> chain.
*
* @author <a href="chenrui@gmail.com">Roger Chen</a>
* @version $id$
*/
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;
}
}