001    /** 
002     * 
003     * Copyright 2004 Protique Ltd
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * You may obtain a copy of the License at 
008     * 
009     * http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS, 
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
014     * See the License for the specific language governing permissions and 
015     * limitations under the License. 
016     * 
017     **/
018    
019    package org.activemq.message;
020    
021    import java.io.Externalizable;
022    import java.io.IOException;
023    import java.io.ObjectInput;
024    import java.io.ObjectOutput;
025    
026    import javax.jms.JMSException;
027    
028    import org.activemq.io.WireFormat;
029    import org.activemq.io.impl.DefaultWireFormat;
030    import org.activemq.util.JMSExceptionHelper;
031    
032    /**
033     * A helper class for using Packet instances with object serialization
034     * 
035     * @version $Revision: 1.1.1.1 $
036     */
037    public class PacketFacade implements Externalizable {
038    
039        private static final long serialVersionUID = -4687188386605805496L;
040    
041        private static final WireFormat wireFormat = new DefaultWireFormat();
042    
043        private transient Packet packet;
044    
045        public PacketFacade() {
046        }
047    
048        public PacketFacade(Packet packet) {
049            this.packet = packet;
050        }
051    
052        public Packet getPacket() {
053            return packet;
054        }
055    
056        public void writeExternal(ObjectOutput out) throws IOException {
057            try {
058                wireFormat.writePacket(packet, out);
059            }
060            catch (JMSException e) {
061                throw JMSExceptionHelper.newIOException(e);
062            }
063        }
064    
065        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
066            int type = in.readByte();
067            packet = wireFormat.readPacket(type, in);
068        }
069    }