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


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 /**
31  * A simple node to represent OR operation
32  *
33  * @version $Id: OrOperator.java,v 1.5 2005/02/14 00:07:08 alphonse.bendt Exp $
34  */
35
36 public class OrOperator extends UnaryOperator
37 {
38     private static final String JavaDoc NAME = "OrOperator";
39
40     private static final String JavaDoc OR = "or";
41
42     public OrOperator(Token tok)
43     {
44         super(tok);
45         setName(NAME);
46     }
47
48     public String JavaDoc toString()
49     {
50         return OR;
51     }
52
53     public EvaluationResult evaluate(EvaluationContext context, EvaluationResult left)
54             throws EvaluationException
55     {
56         if (left.getBool())
57         {
58             return EvaluationResult.BOOL_TRUE;
59         }
60
61         if (right().evaluate(context).getBool())
62         {
63             return EvaluationResult.BOOL_TRUE;
64         }
65
66         return EvaluationResult.BOOL_FALSE;
67     }
68
69     public void acceptInOrder(AbstractTCLVisitor visitor) throws VisitorException
70     {
71         left().acceptInOrder(visitor);
72         visitor.visitOr(this);
73         right().acceptInOrder(visitor);
74     }
75
76     public void acceptPreOrder(AbstractTCLVisitor visitor) throws VisitorException
77     {
78         visitor.visitOr(this);
79         left().acceptPreOrder(visitor);
80         right().acceptPreOrder(visitor);
81     }
82
83     public void acceptPostOrder(AbstractTCLVisitor visitor) throws VisitorException
84     {
85         left().acceptPostOrder(visitor);
86         right().acceptPostOrder(visitor);
87         visitor.visitOr(this);
88     }
89 }
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