package org.apache.ojb.broker.accesslayer.conversions;

 /* Copyright 2002-2005 The Apache Software Foundation

  *

  * 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.

  */

 import java.io.ByteArrayInputStream;

 import java.io.ByteArrayOutputStream;

 import java.io.ObjectInputStream;

 import java.io.ObjectOutputStream;

 import java.util.zip.GZIPInputStream;

 import java.util.zip.GZIPOutputStream;

 /**

  * This implementation of the FieldConversion interface converts

  * between java.lang.Objects values and byte[] values in the rdbms.

  * This conversion is useful to store serialized objects in database

  * columns.

  * <p/>

  * NOTE: This implementation use {@link java.util.zip.GZIPOutputStream} and

  * {@link java.util.zip.GZIPInputStream} to compress data.

  *

  * @see Object2ByteArrUncompressedFieldConversion

  * @author Thomas Mahler

  * @version $Id: Object2ByteArrFieldConversion.java,v 1.1 2007-08-24 22:17:31 ewestfal Exp $

  */

 public class Object2ByteArrFieldConversion implements FieldConversion

 {

     /*

      * @see FieldConversion#javaToSql(Object)

      */

     public Object javaToSql(Object source)

     {

         if (source == null)

             return null;

         try

         {

             ByteArrayOutputStream bao = new ByteArrayOutputStream();

             GZIPOutputStream gos = new GZIPOutputStream(bao);

             ObjectOutputStream oos = new ObjectOutputStream(gos);

             oos.writeObject(source);

             oos.close();

             gos.close();

             bao.close();

             byte[] result = bao.toByteArray();

             return result;

         }

         catch (Throwable t)

         {

             throw new ConversionException(t);

         }

     }

     /*

      * @see FieldConversion#sqlToJava(Object)

      */

     public Object sqlToJava(Object source)

     {

          if (source == null)

             return null;

         try

         {

             ByteArrayInputStream bais = new ByteArrayInputStream((byte[]) source);

             GZIPInputStream gis = new GZIPInputStream(bais);

             ObjectInputStream ois = new ObjectInputStream(gis);

             Object result = ois.readObject();

             ois.close();

             gis.close();

             bais.close();

             return result;

         }

         catch (Throwable t)

         {

             throw new ConversionException(t);

         }

     }

 }