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


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
29 public class TempValue extends UnaryOperator {
30
31     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
32     private static final String JavaDoc RCSName = "$Name: $";
33
34     
35     Literal _value = null;
36
37     public TempValue() {
38     }
39
40     public TempValue(Expression operand) {
41         super(operand);
42     }
43
44     public boolean replaceChild(Expression oldChild, Expression newChild)
45     {
46         //Trace.enter(this, "replaceChild(Expression oldChild, Expression newChild)");
47
48         boolean retVal = false;
49         if (getOperand() == oldChild) {
50             setOperand(newChild);
51             retVal = true;
52         }
53
54         //Trace.exit(this, "replaceChild(Expression oldChild, Expression newChild)");
55 return retVal;
56     }
57
58     public void setValue(Literal value) {
59         _value = value;
60     }
61
62     public Literal getValue() {
63         return _value;
64     }
65
66     public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
67     {
68         return visitor.visit(this);
69     }
70
71     public void accept (AlgebraVisitor visitor) throws SqlWrapperException
72     {
73         visitor.visit(this);
74     }
75
76     /**
77      * @see Expression#deepEquals(Object)
78      */
79     public boolean deepEquals(Object JavaDoc o)
80     {
81         if (o instanceof TempValue)
82         {
83             TempValue cast = (TempValue)o;
84             return super.deepEquals(o) && _value.equals(cast.getValue());
85         }
86         return false;
87     }
88 }
89
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