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:
062: /**
063: *
064: * <p>The implementation of the divide operator
065: *
066: * @author Nathan Abramson - Art Technology Group
067: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
068: **/
069:
070: public class DivideOperator extends BinaryOperator {
071: //-------------------------------------
072: // Singleton
073: //-------------------------------------
074:
075: public static final DivideOperator SINGLETON = new DivideOperator();
076:
077: //-------------------------------------
078: /**
079: *
080: * Constructor
081: **/
082: public DivideOperator() {
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 == null && pRight == null) {
104: if (pLogger.isLoggingWarning()) {
105: pLogger.logWarning(Constants.ARITH_OP_NULL,
106: getOperatorSymbol());
107: }
108: return PrimitiveObjects.getInteger(0);
109: }
110:
111: if (Coercions.isBigDecimal(pLeft)
112: || Coercions.isBigInteger(pLeft)
113: || Coercions.isBigDecimal(pRight)
114: || Coercions.isBigInteger(pRight)) {
115:
116: BigDecimal left = (BigDecimal) Coercions
117: .coerceToPrimitiveNumber(pLeft, BigDecimal.class,
118: pLogger);
119: BigDecimal right = (BigDecimal) Coercions
120: .coerceToPrimitiveNumber(pRight, BigDecimal.class,
121: pLogger);
122:
123: try {
124: return left.divide(right, BigDecimal.ROUND_HALF_UP);
125: } catch (Exception exc) {
126: if (pLogger.isLoggingError()) {
127: pLogger.logError(Constants.ARITH_ERROR,
128: getOperatorSymbol(), "" + left, "" + right);
129: }
130: return PrimitiveObjects.getInteger(0);
131: }
132: } else {
133:
134: double left = Coercions.coerceToPrimitiveNumber(pLeft,
135: Double.class, pLogger).doubleValue();
136: double right = Coercions.coerceToPrimitiveNumber(pRight,
137: Double.class, pLogger).doubleValue();
138:
139: try {
140: return PrimitiveObjects.getDouble(left / right);
141: } catch (Exception exc) {
142: if (pLogger.isLoggingError()) {
143: pLogger.logError(Constants.ARITH_ERROR,
144: getOperatorSymbol(), "" + left, "" + right);
145: }
146: return PrimitiveObjects.getInteger(0);
147: }
148: }
149: }
150:
151: //-------------------------------------
152: }
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