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 is the base class for all unary operators.
49 *
50 * @version $Revision: 1.1 $ $Date: 2004/11/26 01:50:45 $
51 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
52 * @see Expression
53 * @see Operator
54 */
55 abstract class UnaryOperator extends Operator {
56
57 /***
58 * The operand to apply the operator to
59 */
60 private final Expression _operand;
61
62
63 /***
64 * Construct a new <code>UnaryOperator</code>
65 *
66 * @param operator the operator
67 * @param operand the operand
68 */
69 public UnaryOperator(final String operator, final Expression operand) {
70 super(operator);
71 _operand = operand;
72 }
73
74 /***
75 * Returns the operand
76 *
77 * @return the operand
78 */
79 public final Expression operand() {
80 return _operand;
81 }
82
83 /***
84 * Return a string representation of this expression.
85 *
86 * @return a string representation of this expression
87 */
88 public final String toString() {
89 return "(" + operator() + " " + _operand.toString() + ")";
90 }
91
92 }