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     */
017    package org.apache.activemq.kaha;
018    
019    import java.io.DataInput;
020    import java.io.DataOutput;
021    import java.io.IOException;
022    import org.apache.activemq.command.Message;
023    import org.apache.activemq.util.ByteSequence;
024    import org.apache.activemq.wireformat.WireFormat;
025    
026    /**
027     * Implementation of a Marshaller for MessageIds
028     * 
029     * 
030     */
031    public 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    }