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Java > Open Source Codes > org > jacorb > notification > filter > etcl > DefaultOperator


1 package org.jacorb.notification.filter.etcl;
2
3 /*
4  * JacORB - a free Java ORB
5  *
6  * Copyright (C) 1999-2004 Gerald Brose
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public
19  * License along with this library; if not, write to the Free
20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  */
23
24 import org.jacorb.notification.filter.EvaluationContext;
25 import org.jacorb.notification.filter.EvaluationException;
26 import org.jacorb.notification.filter.EvaluationResult;
27 import org.omg.CORBA.Any JavaDoc;
28
29 import antlr.Token;
30
31 /** A simple node to represent DEFAULT operation */
32 public class DefaultOperator extends UnaryOperator {
33
34     public DefaultOperator(Token tok) {
35         super(tok);
36         setName("DefaultOperator");
37     }
38
39     public String JavaDoc toString() {
40         return "default";
41     }
42
43     public EvaluationResult evaluate(EvaluationContext context, EvaluationResult left)
44         throws EvaluationException {
45
46         Any JavaDoc _any = left.getAny();
47
48         if (context.getDynamicEvaluator().hasDefaultDiscriminator( _any )) {
49             return EvaluationResult.BOOL_TRUE;
50         }
51
52         return EvaluationResult.BOOL_FALSE;
53     }
54
55     public void acceptInOrder(AbstractTCLVisitor visitor) throws VisitorException {
56         left().acceptInOrder(visitor);
57         visitor.visitDefault(this);
58     }
59
60     public void acceptPreOrder(AbstractTCLVisitor visitor) throws VisitorException {
61         visitor.visitDefault(this);
62         left().acceptPreOrder(visitor);
63     }
64
65     public void acceptPostOrder(AbstractTCLVisitor visitor) throws VisitorException {
66         left().acceptPostOrder(visitor);
67         visitor.visitDefault(this);
68     }
69 }
70
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