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


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
28 import antlr.Token;
29
30 /** A simple node to represent EXIST operation */
31 public class ExistOperator extends AbstractTCLNode {
32
33     public ExistOperator(Token tok) {
34         super(tok);
35     }
36
37     public String JavaDoc toString() {
38         return "exist";
39     }
40
41     public EvaluationResult evaluate(EvaluationContext context)
42         throws EvaluationException {
43
44         // Message _event = context.getCurrentMessage();
45
46         switch(left().getType()) {
47         case IDENTIFIER:
48             break;
49         case DOLLAR:
50             ETCLComponentName _op = (ETCLComponentName)left();
51             try {
52                 _op.evaluate(context);
53                 return EvaluationResult.BOOL_TRUE;
54             } catch (EvaluationException e) {
55                 return EvaluationResult.BOOL_FALSE;
56             }
57             // return _event.testExists(context,_op);
58 }
59         throw new RuntimeException JavaDoc();
60     }
61
62     public void acceptInOrder(AbstractTCLVisitor visitor) throws VisitorException {
63         left().acceptInOrder(visitor);
64         visitor.visitExist(this);
65     }
66
67     public void acceptPreOrder(AbstractTCLVisitor visitor) throws VisitorException {
68         visitor.visitExist(this);
69         left().acceptPreOrder(visitor);
70     }
71
72     public void acceptPostOrder(AbstractTCLVisitor visitor) throws VisitorException {
73         left().acceptPostOrder(visitor);
74         visitor.visitExist(this);
75     }
76 }
77
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