1 /***
2 * Redistribution and use of this software and associated documentation
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.
9 *
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11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
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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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31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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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 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 toString() {
106 StringBuffer result = new StringBuffer();
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 }