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Java > Open Source Codes > org > apache > ojb > broker > accesslayer > conversions > Int2IntegerFieldConversion


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  * int to Integer, Integer to int. If the int is zero, then
21  * we don't have a value for the key and it must be set to null, not
22  * zero.
23  * @author Aaron Oathout
24  * @version $Id: Int2IntegerFieldConversion.java,v 1.5.2.1 2005/12/21 22:23:38 tomdz Exp $
25  */
26 public class Int2IntegerFieldConversion implements FieldConversion
27 {
28
29     private static final Integer JavaDoc NULL_INTEGER = null;
30     private static final Integer JavaDoc ZERO = new Integer JavaDoc(0);
31
32     public Object JavaDoc javaToSql(Object JavaDoc obj) throws ConversionException
33     {
34         if (obj instanceof Integer JavaDoc)
35         {
36             Integer JavaDoc instance = (Integer JavaDoc) obj;
37             if (instance.equals(ZERO))
38             {
39                 return NULL_INTEGER;
40             }
41             else
42             {
43                 return obj;
44             }
45         }
46         else
47         {
48             return obj;
49         }
50     }
51
52     public Object JavaDoc sqlToJava(Object JavaDoc obj) throws ConversionException
53     {
54         return obj;
55     }
56 }
57
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