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.kahadb.util;
018    
019    import java.io.ByteArrayInputStream;
020    import java.io.ByteArrayOutputStream;
021    import java.io.DataInput;
022    import java.io.DataOutput;
023    import java.io.IOException;
024    import java.io.ObjectInputStream;
025    import java.io.ObjectOutputStream;
026    
027    /**
028     * Implementation of a Marshaller for Objects
029     * 
030     * @version $Revision: 777209 $
031     */
032    public class ObjectMarshaller extends VariableMarshaller<Object> {
033    
034        public void writePayload(Object object, DataOutput dataOut) throws IOException {
035            ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
036            ObjectOutputStream objectOut = new ObjectOutputStream(bytesOut);
037            objectOut.writeObject(object);
038            objectOut.close();
039            byte[] data = bytesOut.toByteArray();
040            dataOut.writeInt(data.length);
041            dataOut.write(data);
042        }
043    
044        public Object readPayload(DataInput dataIn) throws IOException {
045            int size = dataIn.readInt();
046            byte[] data = new byte[size];
047            dataIn.readFully(data);
048            ByteArrayInputStream bytesIn = new ByteArrayInputStream(data);
049            ObjectInputStream objectIn = new ObjectInputStream(bytesIn);
050            try {
051                return objectIn.readObject();
052            } catch (ClassNotFoundException e) {
053                throw new IOException(e.getMessage());
054            }
055        }
056        
057    }