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Java > Open Source Codes > org > xquark > extractor > algebra > UnOpExists


1 /*
2  * This file belongs to the XQuark distribution.
3  * Copyright (C) 2003 Universite de Versailles Saint-Quentin.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307.
18  * You can also get it at http://www.gnu.org/licenses/lgpl.html
19  *
20  * For more information on this software, see http://www.xquark.org.
21  */
22
23 package org.xquark.extractor.algebra;
24
25 import org.xquark.extractor.common.SqlWrapperException;
26 import org.xquark.extractor.sql.SqlExpression;
27
28 public final class UnOpExists extends UnaryAtomicOp
29 {
30
31     private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
32     private static final String JavaDoc RCSName = "$Name: $";
33
34
35     private boolean _notExists ;
36     public UnOpExists(Expression query )
37     {
38         super ( query ) ;
39         setNot ( false ) ;
40     }
41     public UnOpExists(Expression query , boolean notExists)
42     {
43         super ( query ) ;
44         setNot ( notExists ) ;
45     }
46
47     public void setNot ( boolean notExists)
48     {
49         _notExists = notExists ;
50     }
51
52     public boolean getNot ()
53     {
54         return _notExists ;
55     }
56
57     public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
58     {
59         return visitor.visit(this);
60     }
61
62     public void accept (AlgebraVisitor visitor) throws SqlWrapperException
63     {
64         visitor.visit(this);
65     }
66
67     /**
68      * @see Expression#deepEquals(Object)
69      */
70     public boolean deepEquals(Object JavaDoc o)
71     {
72         if (o instanceof UnOpExists)
73         {
74             UnOpExists cast = (UnOpExists)o;
75             return _notExists == cast.getNot() && super.deepEquals(o);
76         }
77         return false;
78     }
79 }
80
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