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The ActiveMQ Message Broker and Client implementations

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.activemq.kaha;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.activemq.command.Message;
import org.apache.activemq.util.ByteSequence;
import org.apache.activemq.wireformat.WireFormat;

/**
 * Implementation of a Marshaller for MessageIds
 * 
 * @version $Revision: 1.2 $
 */
public class MessageMarshaller implements Marshaller {

    private WireFormat wireFormat;

    /**
     * Constructor
     * 
     * @param wireFormat
     */
    public MessageMarshaller(WireFormat wireFormat) {
        this.wireFormat = wireFormat;
    }

    /**
     * Write the payload of this entry to the RawContainer
     * 
     * @param message
     * @param dataOut
     * @throws IOException
     */
    public void writePayload(Message message, DataOutput dataOut) throws IOException {
        ByteSequence packet = wireFormat.marshal(message);
        dataOut.writeInt(packet.length);
        dataOut.write(packet.data, packet.offset, packet.length);
    }

    /**
     * Read the entry from the RawContainer
     * 
     * @param dataIn
     * @return unmarshalled object
     * @throws IOException
     */
    public Message readPayload(DataInput dataIn) throws IOException {
        int size = dataIn.readInt();
        byte[] data = new byte[size];
        dataIn.readFully(data);
        return (Message)wireFormat.unmarshal(new ByteSequence(data));
    }
}