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>The implementation of the less than operator
065: *
066: * @author Nathan Abramson - Art Technology Group
067: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
068: **/
069:
070: public class LessThanOperator extends RelationalOperator {
071: //-------------------------------------
072: // Singleton
073: //-------------------------------------
074:
075: public static final LessThanOperator SINGLETON = new LessThanOperator();
076:
077: //-------------------------------------
078: /**
079: *
080: * Constructor
081: **/
082: public LessThanOperator() {
083: }
084:
085: //-------------------------------------
086: // Expression methods
087: //-------------------------------------
088: /**
089: *
090: * Returns the symbol representing the operator
091: **/
092: public String getOperatorSymbol() {
093: return "<";
094: }
095:
096: //-------------------------------------
097: /**
098: *
099: * Applies the operator to the given value
100: **/
101: public Object apply(Object pLeft, Object pRight, Logger pLogger)
102: throws ELException {
103: if (pLeft == pRight) {
104: return Boolean.FALSE;
105: } else if (pLeft == null || pRight == null) {
106: return Boolean.FALSE;
107: } else {
108: return super .apply(pLeft, pRight, pLogger);
109: }
110: }
111:
112: //-------------------------------------
113: /**
114: *
115: * Applies the operator to the given double values
116: **/
117: public boolean apply(double pLeft, double pRight) {
118: return pLeft < pRight;
119: }
120:
121: //-------------------------------------
122: /**
123: *
124: * Applies the operator to the given long values
125: **/
126: public boolean apply(long pLeft, long pRight) {
127: return pLeft < pRight;
128: }
129:
130: //-------------------------------------
131: /**
132: *
133: * Applies the operator to the given String values
134: **/
135: public boolean apply(String pLeft, String pRight) {
136: return pLeft.compareTo(pRight) < 0;
137: }
138:
139: //-------------------------------------
140:
141: /**
142: *
143: * Applies the operator to the given BigDecimal values, returning a BigDecimal
144: **/
145: public boolean apply(BigDecimal pLeft, BigDecimal pRight) {
146: return isLess(pLeft.compareTo(pRight));
147: }
148:
149: //-------------------------------------
150:
151: /**
152: *
153: * Applies the operator to the given BigDecimal values, returning a BigDecimal
154: **/
155: public boolean apply(BigInteger pLeft, BigInteger pRight) {
156: return isLess(pLeft.compareTo(pRight));
157: }
158:
159: //-------------------------------------
160: }
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