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Java > Open Source Codes > org > exolab > jms > selector > BinaryOperator


1 /**
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3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
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8  * copy of this document.
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10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
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16  * products derived from this Software without prior written
17  * permission of Exoffice Technologies. For written permission,
18  * please contact info@exolab.org.
19  *
20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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40  *
41  * Copyright 2000-2001,2003 (C) Exoffice Technologies Inc. All Rights Reserved.
42  */
43
44 package org.exolab.jms.selector;
45
46
47 /**
48  * This class is the base class for all expressions that are binary
49  * operators.
50  *
51  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
52  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
53  * @see Expression
54  * @see Operator
55  */
56 abstract class BinaryOperator extends Operator {
57
58     /**
59      * The left-hand side of the binary expression
60      */
61     private final Expression _lhs;
62
63     /**
64      * The right-hand side of the binary expression
65      */
66     private final Expression _rhs;
67
68     /**
69      * Construct a new <code>BinaryOperator</code>
70      *
71      * @param operator the operator
72      * @param lhs the left hand side of the expression
73      * @param rhs the right hand side of the expression
74      */
75     public BinaryOperator(final String JavaDoc operator, final Expression lhs,
76                           final Expression rhs) {
77         super(operator);
78         _lhs = lhs;
79         _rhs = rhs;
80     }
81
82     /**
83      * Returns the left hand side of the expression
84      *
85      * @return the left hand side of the expression
86      */
87     public final Expression left() {
88         return _lhs;
89     }
90
91     /**
92      * Returns the right hand side of the expression
93      *
94      * @return the right hand side of the expression
95      */
96     public final Expression right() {
97         return _rhs;
98     }
99
100     /**
101      * Returns a stringified version of the expression
102      *
103      * @return a stringified version of the expression
104      */
105     public final String JavaDoc toString() {
106         StringBuffer JavaDoc result = new StringBuffer JavaDoc();
107         result.append('(');
108         result.append(_lhs.toString());
109         result.append(' ');
110         result.append(operator());
111         result.append(' ');
112         result.append(_rhs.toString());
113         result.append(')');
114         return result.toString();
115     }
116
117 } //-- BinaryOperator
118
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