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


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 [not] exists(sub query)
20  *
21  * @author <a HREF="mailto:jbraeuchi@gmx.ch">Jakob Braeuchi</a>
22  * @version $Id: ExistsCriteria.java,v 1.7.2.1 2005/12/21 22:27:09 tomdz Exp $
23  */
24 public class ExistsCriteria extends SelectionCriteria
25 {
26     private boolean m_negative = false;
27     /**
28      * Constructor for ExistsCriteria.
29      * @param subQuery
30      * @param negative use negative form
31      */
32     ExistsCriteria(Query subQuery, boolean negative)
33     {
34         super("", subQuery, (String JavaDoc)null);
35         m_negative = negative;
36     }
37
38     /*
39      * @see SelectionCriteria#getClause()
40      */
41     public String JavaDoc getClause()
42     {
43         if (m_negative)
44         {
45             return " NOT EXISTS";
46         }
47         else
48         {
49             return " EXISTS";
50         }
51     }
52 }
53
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