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.jbpm.jpdl.el.impl;
057:
058: import org.jbpm.jpdl.el.ELException;
059:
060: import java.math.BigDecimal;
061: import java.math.BigInteger;
062:
063: /**
064: *
065: * <p>This is the superclass for all relational operators (except ==
066: * or !=)
067: *
068: * @author Nathan Abramson - Art Technology Group
069: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
070: **/
071:
072: public abstract class RelationalOperator extends BinaryOperator {
073:
074: //-------------------------------------
075: /**
076: *
077: * Applies the operator to the given value
078: **/
079: public Object apply(Object pLeft, Object pRight, Logger pLogger)
080: throws ELException {
081: return Coercions.applyRelationalOperator(pLeft, pRight, this ,
082: pLogger);
083: }
084:
085: //-------------------------------------
086: /**
087: *
088: * Applies the operator to the given double values
089: **/
090: public abstract boolean apply(double pLeft, double pRight);
091:
092: //-------------------------------------
093: /**
094: *
095: * Applies the operator to the given long values
096: **/
097: public abstract boolean apply(long pLeft, long pRight);
098:
099: //-------------------------------------
100: /**
101: *
102: * Applies the operator to the given String values
103: **/
104: public abstract boolean apply(String pLeft, String pRight);
105:
106: //-------------------------------------
107:
108: /**
109: * Applies the operator to the given BigDecimal values, returning a BigDecimal
110: **/
111: public abstract boolean apply(BigDecimal pLeft, BigDecimal pRight);
112:
113: //-------------------------------------
114:
115: /**
116: * Applies the operator to the given BigDecimal values, returning a BigDecimal
117: **/
118: public abstract boolean apply(BigInteger pLeft, BigInteger pRight);
119:
120: //-------------------------------------
121:
122: /**
123: * Test return value of BigInteger/BigDecimal A.compareTo(B).
124: * @param val - result of BigInteger/BigDecimal compareTo() call
125: * @return - true if result is less than 0, otherwise false
126: */
127: protected boolean isLess(int val) {
128: if (val < 0)
129: return true;
130: else
131: return false;
132: }
133:
134: /**
135: * Test return value of BigInteger/BigDecimal A.compareTo(B).
136: * @param val - result of BigInteger/BigDecimal compareTo() call
137: * @return - true if result is equal to 0, otherwise false
138: */
139: protected boolean isEqual(int val) {
140: if (val == 0)
141: return true;
142: else
143: return false;
144: }
145:
146: /**
147: * Test return value of BigInteger/BigDecimal A.compareTo(B).
148: * @param val - result of BigInteger/BigDecimal compareTo() call
149: * @return - true if result is greater than 0, otherwise false
150: */
151: protected boolean isGreater(int val) {
152: if (val > 0)
153: return true;
154: else
155: return false;
156: }
157: }
|