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


1 /*
2  * JacORB - a free Java ORB
3  *
4  * Copyright (C) 1999-2004 Gerald Brose
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public
17  * License along with this library; if not, write to the Free
18  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19  *
20  */
21 package org.jacorb.notification.filter.etcl;
22
23 import org.jacorb.notification.filter.EvaluationContext;
24 import org.jacorb.notification.filter.EvaluationException;
25 import org.jacorb.notification.filter.EvaluationResult;
26
27 import antlr.Token;
28
29 /** A simple node to represent NEQ operation */
30 public class NeqOperator extends BinaryOperator
31 {
32
33     public NeqOperator(Token tok)
34     {
35         super(tok);
36         setName("NeqOperator");
37     }
38
39     public EvaluationResult evaluate(EvaluationContext context, EvaluationResult left,
40             EvaluationResult right) throws EvaluationException
41     {
42
43         int _comp = left.compareTo(right);
44
45         if (_comp == 0)
46         {
47             return EvaluationResult.BOOL_FALSE;
48         }
49         return EvaluationResult.BOOL_TRUE;
50     }
51
52     public String JavaDoc toString()
53     {
54         return "!=";
55     }
56
57     public void acceptInOrder(AbstractTCLVisitor visitor) throws VisitorException
58     {
59         left().acceptInOrder(visitor);
60         visitor.visitNeq(this);
61         right().acceptInOrder(visitor);
62     }
63
64     public void acceptPostOrder(AbstractTCLVisitor visitor) throws VisitorException
65     {
66         left().acceptInOrder(visitor);
67         right().acceptInOrder(visitor);
68         visitor.visitNeq(this);
69     }
70
71     public void acceptPreOrder(AbstractTCLVisitor visitor) throws VisitorException
72     {
73         visitor.visitNeq(this);
74         left().acceptInOrder(visitor);
75         right().acceptInOrder(visitor);
76     }
77 }
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