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 *
6 * 1. Redistributions of source code must retain copyright
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8 * copy of this document.
9 *
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
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 implements a '-' expression.
49 *
50 * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:44 $
51 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
52 * @see Expression
53 * @see MathOperator
54 * @see SNumber
55 */
56 class Subtract extends MathOperator {
57
58 /***
59 * Construct a new <code>Subtract</code> operator
60 *
61 * @param lhs the left hand side of the expression
62 * @param rhs the right hand side of the expression
63 */
64 public Subtract(final Expression lhs, final Expression rhs) {
65 super("-", lhs, rhs);
66 }
67
68 /***
69 * Evaluate the expression
70 *
71 * @param lhs the left hand side of the expression
72 * @param rhs the right hand side of the expression
73 * @return the value of <code>lhs - rhs</code>
74 */
75 protected final SNumber evaluate(final SNumber lhs, final SNumber rhs) {
76 return lhs.subtract(rhs);
77 }
78
79 }