Source code: org/apache/commons/el/RelationalOperator.java
1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 1999 The Apache Software Foundation. All rights
5 * reserved.
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8 * modification, are permitted provided that the following conditions
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11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
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18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
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27 * Foundation" must not be used to endorse or promote products derived
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35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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55
56 package org.apache.commons.el;
57
58 import javax.servlet.jsp.el.ELException;
59 import java.math.BigDecimal;
60 import java.math.BigInteger;
61
62 /**
63 *
64 * <p>This is the superclass for all relational operators (except ==
65 * or !=)
66 *
67 * @author Nathan Abramson - Art Technology Group
68 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
69 **/
70
71 public abstract class RelationalOperator
72 extends BinaryOperator
73 {
74
75 //-------------------------------------
76 /**
77 *
78 * Applies the operator to the given value
79 **/
80 public Object apply (Object pLeft,
81 Object pRight,
82 Logger pLogger)
83 throws ELException
84 {
85 return Coercions.applyRelationalOperator (pLeft, pRight, this, pLogger);
86 }
87
88 //-------------------------------------
89 /**
90 *
91 * Applies the operator to the given double values
92 **/
93 public abstract boolean apply (double pLeft,
94 double pRight
95 );
96
97 //-------------------------------------
98 /**
99 *
100 * Applies the operator to the given long values
101 **/
102 public abstract boolean apply (long pLeft,
103 long pRight
104 );
105
106 //-------------------------------------
107 /**
108 *
109 * Applies the operator to the given String values
110 **/
111 public abstract boolean apply (String pLeft,
112 String pRight
113 );
114
115 //-------------------------------------
116
117
118 /**
119 * Applies the operator to the given BigDecimal values, returning a BigDecimal
120 **/
121 public abstract boolean apply(BigDecimal pLeft, BigDecimal pRight);
122
123 //-------------------------------------
124
125 /**
126 * Applies the operator to the given BigDecimal values, returning a BigDecimal
127 **/
128 public abstract boolean apply(BigInteger pLeft, BigInteger pRight);
129
130 //-------------------------------------
131
132
133 /**
134 * Test return value of BigInteger/BigDecimal A.compareTo(B).
135 * @param val - result of BigInteger/BigDecimal compareTo() call
136 * @return - true if result is less than 0, otherwise false
137 */
138 protected boolean isLess(int val) {
139 if (val < 0)
140 return true;
141 else
142 return false;
143 }
144
145 /**
146 * Test return value of BigInteger/BigDecimal A.compareTo(B).
147 * @param val - result of BigInteger/BigDecimal compareTo() call
148 * @return - true if result is equal to 0, otherwise false
149 */
150 protected boolean isEqual(int val) {
151 if (val == 0)
152 return true;
153 else
154 return false;
155 }
156
157 /**
158 * Test return value of BigInteger/BigDecimal A.compareTo(B).
159 * @param val - result of BigInteger/BigDecimal compareTo() call
160 * @return - true if result is greater than 0, otherwise false
161 */
162 protected boolean isGreater(int val) {
163 if (val > 0)
164 return true;
165 else
166 return false;
167 }
168 }