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Java > Open Source Codes > org > mr > api > jms > selector > syntax > BinaryOperator


1 /*
2  * Copyright 2002 by
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7  * 1.1 (the "License"); you may not use this file except in compliance with the
8  * License. You may obtain a copy of the License at
9  * http://www.mozilla.org/MPL/
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13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is "MantaRay" (TM).
17  *
18  * The Initial Developer of the Original Code is Coridan.
19  * Portions created by the Initial Developer are Copyright (C) 2006
20  * Coridan Inc. All Rights Reserved.
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25  * Alternatively, the contents of this file may be used under the terms of the
26  * LGPL license (the "GNU LESSER GENERAL PUBLIC LICENSE"), in which case the
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33  * of this file under either the MPL or the GNU LESSER GENERAL PUBLIC LICENSE.
34  
35  *
36  * This library is free software; you can redistribute it and/or modify it
37  * under the terms of the MPL as stated above or under the terms of the GNU
38  * Lesser General Public License as published by the Free Software Foundation;
39  * either version 2.1 of the License, or any later version.
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41  * This library is distributed in the hope that it will be useful, but WITHOUT
42  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
43  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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45  */
46 package org.mr.api.jms.selector.syntax;
47
48
49 /**
50  * This class is the base class for all expressions that are binary
51  * operators.
52  *
53  */
54 abstract class BinaryOperator extends Operator {
55
56     
57     /**
58      * The left-hand side of the binary expression
59      */
60     private final Expression leftHand;
61
62     
63     /**
64      * The right-hand side of the binary expression
65      */
66     private final Expression rightHand;
67
68     /**
69      * Construct a new BinaryOperator
70      *
71      * @param operator the operator
72      * @param leftHand the left hand side of the expression
73      * @param rightHand the right hand side of the expression
74      */
75     public BinaryOperator(final String JavaDoc operator, final Expression leftHand,final Expression rightHand) {
76         super(operator);
77         this.leftHand = leftHand;
78         this.rightHand = rightHand;
79     }//BinaryOperator
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 leftHand;
89     }//left
90
91     
92     /**
93      * Returns the right hand side of the expression
94      *
95      * @return the right hand side of the expression
96      */
97     public final Expression right() {
98         return rightHand;
99     }//right
100
101     
102     /**
103      * Returns a stringified version of the expression
104      *
105      * @return a stringified version of the expression
106      */
107     public final String JavaDoc toString() {
108         
109         StringBuffer JavaDoc result = new StringBuffer JavaDoc();
110         result.append('(');
111         result.append(leftHand.toString());
112         result.append(' ');
113         result.append(operator());
114         result.append(' ');
115         result.append(rightHand.toString());
116         result.append(')');
117         return result.toString();
118     }//toString
119 }//BinaryOperator
120
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