BlankString2NullFieldConversion


1   package org.apache.ojb.broker.accesslayer.conversions;
2   
3   /* Copyright 2002-2005 The Apache Software Foundation
4    *
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  /**
19   * this implementation of the FieldConversion interface converts
20   * between blank strings ("") and nulls values in the rdbms. This is to make
21   * oracle and SQL Server compatible, as Oracle stores blank strings as nulls,
22   * which makes comparisons on re-materialized objects problematic.
23   * @author      Matthew Baird
24   * @version $Id: BlankString2NullFieldConversion.java,v 1.5.2.1 2005/12/21 22:23:38 tomdz Exp $
25   */
26  public class BlankString2NullFieldConversion implements FieldConversion
27  {
28  
29      /*
30       * @see FieldConversion#javaToSql(Object)
31       */
32      public Object   javaToSql(Object   source)
33      {
34          if (source instanceof String  )
35          {
36              if (((String  )source).trim().length() == 0)
37                  return null;
38          }
39          return source;
40      }
41  
42      /*
43       * @see FieldConversion#sqlToJava(Object)
44       */
45      public Object   sqlToJava(Object   source)
46      {
47          return source;
48      }
49  
50  }
51

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