001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: */
055:
056: package org.apache.commons.el;
057:
058: import javax.servlet.jsp.el.ELException;
059: import java.math.BigDecimal;
060: import java.math.BigInteger;
061:
062: /**
063: *
064: * <p>This is the superclass for all relational operators (except ==
065: * or !=)
066: *
067: * @author Nathan Abramson - Art Technology Group
068: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
069: **/
070:
071: public abstract class RelationalOperator extends BinaryOperator {
072:
073: //-------------------------------------
074: /**
075: *
076: * Applies the operator to the given value
077: **/
078: public Object apply(Object pLeft, Object pRight, Logger pLogger)
079: throws ELException {
080: return Coercions.applyRelationalOperator(pLeft, pRight, this ,
081: pLogger);
082: }
083:
084: //-------------------------------------
085: /**
086: *
087: * Applies the operator to the given double values
088: **/
089: public abstract boolean apply(double pLeft, double pRight);
090:
091: //-------------------------------------
092: /**
093: *
094: * Applies the operator to the given long values
095: **/
096: public abstract boolean apply(long pLeft, long pRight);
097:
098: //-------------------------------------
099: /**
100: *
101: * Applies the operator to the given String values
102: **/
103: public abstract boolean apply(String pLeft, String pRight);
104:
105: //-------------------------------------
106:
107: /**
108: * Applies the operator to the given BigDecimal values, returning a BigDecimal
109: **/
110: public abstract boolean apply(BigDecimal pLeft, BigDecimal pRight);
111:
112: //-------------------------------------
113:
114: /**
115: * Applies the operator to the given BigDecimal values, returning a BigDecimal
116: **/
117: public abstract boolean apply(BigInteger pLeft, BigInteger pRight);
118:
119: //-------------------------------------
120:
121: /**
122: * Test return value of BigInteger/BigDecimal A.compareTo(B).
123: * @param val - result of BigInteger/BigDecimal compareTo() call
124: * @return - true if result is less than 0, otherwise false
125: */
126: protected boolean isLess(int val) {
127: if (val < 0)
128: return true;
129: else
130: return false;
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 equal to 0, otherwise false
137: */
138: protected boolean isEqual(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 greater than 0, otherwise false
149: */
150: protected boolean isGreater(int val) {
151: if (val > 0)
152: return true;
153: else
154: return false;
155: }
156: }
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