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 1.1 2007-08-24 22:17:31 ewestfal 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 }