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


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 java.util.List JavaDoc;
26
27 import org.xquark.extractor.common.Debug;
28 import org.xquark.extractor.sql.SqlExpression;
29
30 public class PseudoExpression extends Expression {
31     private static final String JavaDoc RCSRevision = "$Revision: 1.3 $";
32     private static final String JavaDoc RCSName = "$Name: $";
33
34     CollectionName _collectionName = null;
35
36     public PseudoExpression() {
37     }
38
39     public void setCollectionName(CollectionName collectionName)
40     {
41         _collectionName = collectionName;
42     }
43
44     public CollectionName getCollectionName()
45     {
46         return _collectionName;
47     }
48
49     public List JavaDoc getOperands()
50     {
51         return null;
52     }
53
54     public SqlExpression accept(GenSqlVisitor visitor) throws org.xquark.extractor.common.SqlWrapperException {
55         Debug.assertTrue(false, "internal logic error");
56         return null;
57     }
58     public void accept(AlgebraVisitor visitor) throws org.xquark.extractor.common.SqlWrapperException {
59         Debug.assertTrue(false, "internal logic error");
60     }
61     
62     /**
63      * @see Expression#deepEquals(Object)
64      */
65     public boolean deepEquals(Object JavaDoc o)
66     {
67         if (o instanceof PseudoExpression)
68         {
69             PseudoExpression cast = (PseudoExpression)o;
70             return _collectionName.equals(cast.getCollectionName());
71         }
72         return false;
73     }
74 }
75
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