001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  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 */
017package org.apache.activemq.kaha;
018
019import java.io.DataInput;
020import java.io.DataOutput;
021import java.io.IOException;
022import org.apache.activemq.command.Message;
023import org.apache.activemq.util.ByteSequence;
024import org.apache.activemq.wireformat.WireFormat;
025
026/**
027 * Implementation of a Marshaller for MessageIds
028 * 
029 * 
030 */
031public class MessageMarshaller implements Marshaller<Message> {
032
033    private WireFormat wireFormat;
034
035    /**
036     * Constructor
037     * 
038     * @param wireFormat
039     */
040    public MessageMarshaller(WireFormat wireFormat) {
041        this.wireFormat = wireFormat;
042    }
043
044    /**
045     * Write the payload of this entry to the RawContainer
046     * 
047     * @param message
048     * @param dataOut
049     * @throws IOException
050     */
051    public void writePayload(Message message, DataOutput dataOut) throws IOException {
052        ByteSequence packet = wireFormat.marshal(message);
053        dataOut.writeInt(packet.length);
054        dataOut.write(packet.data, packet.offset, packet.length);
055    }
056
057    /**
058     * Read the entry from the RawContainer
059     * 
060     * @param dataIn
061     * @return unmarshalled object
062     * @throws IOException
063     */
064    public Message readPayload(DataInput dataIn) throws IOException {
065        int size = dataIn.readInt();
066        byte[] data = new byte[size];
067        dataIn.readFully(data);
068        return (Message)wireFormat.unmarshal(new ByteSequence(data));
069    }
070}