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


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 import java.util.Map JavaDoc;
27
28 import org.xquark.extractor.common.SqlWrapperException;
29 import org.xquark.extractor.sql.SqlExpression;
30
31 public final class LitList extends Expression
32 {
33     private static final String JavaDoc RCSRevision = "$Revision: 1.4 $";
34     private static final String JavaDoc RCSName = "$Name: $";
35
36     private List JavaDoc _litList = null;
37
38
39     public LitList(List JavaDoc litList) {
40         setLitList(litList);
41     }
42
43     synchronized Object JavaDoc clone(Map JavaDoc clonedExprs) throws CloneNotSupportedException JavaDoc
44     {
45         //Trace.enter(this, "clone(Map clonedExprs)");
46
47         LitList retVal = (LitList)super.clone(clonedExprs);
48
49         retVal.setLitList( AlgebraTools.clone(getLitList(),clonedExprs) );
50
51         clonedExprs.put(this, retVal);
52         //Trace.exit(this, "clone(Map clonedExprs)");
53 return retVal;
54     }
55
56
57     public List JavaDoc getLitList() {
58         return _litList;
59     }
60
61     public void setLitList(List JavaDoc litList) {
62         _litList = litList;
63     }
64
65     public String JavaDoc pprint() {
66         StringBuffer JavaDoc retVal = new StringBuffer JavaDoc();
67         retVal.append('(');
68
69         if (null != _litList && !_litList.isEmpty()){
70             for (int i = 0; i < _litList.size()-1; i++) {
71                 retVal.append(((Expression)_litList.get(i)).pprint());
72                 retVal.append(", ");
73             }
74             retVal.append(((Expression)_litList.get( _litList.size()-1)).pprint());
75         }
76         retVal.append(')');
77         return retVal.toString();
78     }
79
80     public List JavaDoc getOperands() {
81         return null ;
82     }
83
84     public SqlExpression accept (GenSqlVisitor visitor) throws SqlWrapperException
85     {
86         return visitor.visit(this);
87     }
88
89     public void accept (AlgebraVisitor visitor) throws SqlWrapperException
90     {
91         visitor.visit(this);
92     }
93     
94     /**
95      * @see Expression#deepEquals(Object)
96      */
97     public boolean deepEquals(Object JavaDoc o)
98     {
99         if (o instanceof LitList)
100             return AlgebraTools.areExprListEquivalent(_litList, ((LitList)o).getLitList());
101         return false;
102     }
103 }
104
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