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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2014 Andy Jefferson and others. All rights reserved.
Licensed 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.

Contributors:
    ...
**********************************************************************/
package org.datanucleus.store.types.converters;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.nio.ByteBuffer;

import org.datanucleus.exceptions.NucleusException;
import org.datanucleus.store.types.converters.TypeConverter;

/**
 * Convenience class to handle Java serialisation of a Serializable object to/from ByteBuffer.
 */
public class SerializableByteBufferConverter implements TypeConverter
{

    private static final long serialVersionUID = 585211414298721468L;

    /* (non-Javadoc)
     * @see org.datanucleus.store.types.converters.TypeConverter#toDatastoreType(java.lang.Object)
     */
    public ByteBuffer toDatastoreType(Serializable memberValue)
    {
        if (memberValue == null)
        {
            return null;
        }
        byte[] bytes = null;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = null;
        try
        {
            try
            {
                oos = new ObjectOutputStream(baos);
                oos.writeObject(memberValue);
                bytes = baos.toByteArray();
            }
            finally
            {
                try
                {
                    baos.close();
                }
                finally
                {
                    if (oos != null)
                    {
                        oos.close();
                    }
                }
            }
        }
        catch (IOException ioe)
        {
            throw new NucleusException("Error serialising object of type " + memberValue.getClass().getName() + " to ByteBuffer", ioe);
        }

        ByteBuffer byteBuffer = ByteBuffer.allocate(bytes.length);
        byteBuffer.put(bytes);
        return byteBuffer;
    }

    /* (non-Javadoc)
     * @see org.datanucleus.store.types.converters.TypeConverter#toMemberType(java.lang.Object)
     */
    public Serializable toMemberType(ByteBuffer datastoreValue)
    {
        if (datastoreValue == null)
        {
            return null;
        }
        Serializable obj = null;
        ByteArrayInputStream bais = new ByteArrayInputStream(datastoreValue.array());
        ObjectInputStream ois = null;
        try
        {
            try
            {
                ois = new ObjectInputStream(bais);
                obj = (Serializable)ois.readObject();
            }
            finally
            {
                try
                {
                    bais.close();
                }
                finally
                {
                    if (ois != null)
                    {
                        ois.close();
                    }
                }
            }
        }
        catch (Exception e)
        {
            throw new NucleusException("Error deserialising " + datastoreValue, e);
        }
        return obj;
    }

}