01: package org.apache.ojb.broker.query;
02:
03: /* Copyright 2002-2005 The Apache Software Foundation
04: *
05: * Licensed under the Apache License, Version 2.0 (the "License");
06: * you may not use this file except in compliance with the License.
07: * You may obtain a copy of the License at
08: *
09: * 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: private boolean m_negative = false;
26:
27: /**
28: * Constructor for ExistsCriteria.
29: * @param subQuery
30: * @param negative use negative form
31: */
32: ExistsCriteria(Query subQuery, boolean negative) {
33: super ("", subQuery, (String) null);
34: m_negative = negative;
35: }
36:
37: /*
38: * @see SelectionCriteria#getClause()
39: */
40: public String getClause() {
41: if (m_negative) {
42: return " NOT EXISTS";
43: } else {
44: return " EXISTS";
45: }
46: }
47: }
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