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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.fusesource.hawtbuf.codec;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
 * Implementation of a Marshaller for Objects
 * 
 */
public class ObjectCodec extends VariableCodec {

    public void encode(Object object, DataOutput dataOut) throws IOException {
        ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
        ObjectOutputStream objectOut = new ObjectOutputStream(bytesOut);
        objectOut.writeObject(object);
        objectOut.close();
        byte[] data = bytesOut.toByteArray();
        dataOut.writeInt(data.length);
        dataOut.write(data);
    }

    public T decode(DataInput dataIn) throws IOException {
        int size = dataIn.readInt();
        byte[] data = new byte[size];
        dataIn.readFully(data);
        ByteArrayInputStream bytesIn = new ByteArrayInputStream(data);
        ObjectInputStream objectIn = new ObjectInputStream(bytesIn);
        try {
            return (T) objectIn.readObject();
        } catch (ClassNotFoundException e) {
            throw createIOException(e.getMessage(), e);
        }
    }

    private static IOException createIOException(String message, Throwable cause) {
        IOException answer = new IOException(message);
        answer.initCause(cause);
        return answer;
    }
    
}