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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.hyracks.dataflow.hadoop.mapreduce;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.Serializable;

import org.apache.hadoop.io.Writable;

public class MarshalledWritable implements Serializable {
    private static final long serialVersionUID = 1L;

    private byte[] bytes;

    public MarshalledWritable() {
    }

    public void set(T o) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeUTF(o.getClass().getName());
        o.write(dos);
        dos.close();
        bytes = baos.toByteArray();
    }

    public T get() throws Exception {
        ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
        DataInputStream dis = new DataInputStream(bais);
        String className = dis.readUTF();
        T o = (T) HadoopTools.newInstance(className);
        o.readFields(dis);
        return o;
    }
}