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.

  */

 /**

  * this implementation of the FieldConversion interface converts

  * between blank strings ("") and nulls values in the rdbms. This is to make

  * oracle and SQL Server compatible, as Oracle stores blank strings as nulls,

  * which makes comparisons on re-materialized objects problematic.

  * @author                Matthew Baird

  * @version $Id: BlankString2NullFieldConversion.java,v 1.1 2007-08-24 22:17:31 ewestfal Exp $

  */

 public class BlankString2NullFieldConversion implements FieldConversion

 {

     /*

      * @see FieldConversion#javaToSql(Object)

      */

     public Object javaToSql(Object source)

     {

         if (source instanceof String)

         {

             if (((String)source).trim().length() == 0)

                      return null;

         }

         return source;

     }

     /*

      * @see FieldConversion#sqlToJava(Object)

      */

     public Object sqlToJava(Object source)

     {

         return source;

     }

 }