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


1 /**
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12  * following disclaimer in the documentation and/or other
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21  * nor may "Exolab" appear in their names without prior written
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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 JavaDoc 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 JavaDoc toString() {
89         return "(" + operator() + " " + _operand.toString() + ")";
90     }
91
92 } //-- UnaryOperator
93
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