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Java > Open Source Codes > org > apache > ojb > broker > query > NullCriteria


1 package org.apache.ojb.broker.query;
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  * SelectionCriteria for 'is null' and 'is not null'
20  *
21  * @author <a HREF="mailto:jbraeuchi@gmx.ch">Jakob Braeuchi</a>
22  * @version $Id: NullCriteria.java,v 1.9.2.1 2005/12/21 22:27:09 tomdz Exp $
23  */
24 public class NullCriteria extends ValueCriteria
25 {
26     NullCriteria(String JavaDoc anAttribute, String JavaDoc aClause, String JavaDoc anAlias)
27     {
28         super(anAttribute, null, aClause, anAlias);
29     }
30
31     NullCriteria(String JavaDoc anAttribute, String JavaDoc aClause, UserAlias anAlias)
32     {
33         super(anAttribute, null, aClause, anAlias);
34     }
35
36     public String JavaDoc toString()
37     {
38         return getAttribute() + getClause();
39     }
40
41     /**
42      * @see SelectionCriteria#isBound()
43      */
44     public boolean isBound()
45     {
46         return true;
47     }
48
49     /**
50      * @see SelectionCriteria#isBindable()
51      */
52     protected boolean isBindable()
53     {
54         return false;
55     }
56
57 }
58
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