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Java > Open Source Codes > org > xquark > xquery > parser > BinOpANDExpression


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
24 package org.xquark.xquery.parser;
25
26 import org.xquark.xquery.typing.TypeException;
27
28 public class BinOpANDExpression extends XQueryBooleanOperatorExpression implements Cloneable JavaDoc {
29     
30     private static final String JavaDoc RCSRevision = "$Revision: 1.7 $";
31     private static final String JavaDoc RCSName = "$Name: $";
32     
33     // #############################################################################
34 // VISITOR STUFF
35 // #############################################################################
36
37     public void accept(ParserVisitor visitor) throws XQueryException {
38         visitor.visit(this);
39     }
40     
41     // #############################################################################
42 // CONSTRUCTOR STUFF
43 // #############################################################################
44
45     public BinOpANDExpression(XQueryExpression expression1, XQueryExpression expression2, XQueryModule parentModule) throws TypeException, XQueryException {
46         super(expression1,expression2);
47         setParentModule(parentModule);
48         if (parentModule != null && parentModule.getStaticContext().getTypeVisitor() != null)
49             accept(parentModule.getStaticContext().getTypeVisitor());
50     }
51     
52     // #############################################################################
53 // OTHER STUFF
54 // #############################################################################
55 // only one level for now
56 public XQueryExpression erasePart(XQueryExpression expr) throws XQueryException {
57         if (this == expr)
58             return null;
59         if (expression1 == expr)
60             return expression2;
61         if (expression2 == expr)
62             return expression1;
63         XQueryExpression resexpr = expression1.erasePart(expr);
64         if (resexpr != expression1)
65             this.setExpression1(resexpr);
66         else {
67             resexpr = expression2.erasePart(expr);
68             if (resexpr != expression2)
69                 this.setExpression2(resexpr);
70         }
71         return this;
72     }
73
74 }
75
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