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:
061: /**
062: *
063: * <p>The implementation of the divide operator
064: *
065: * @author Nathan Abramson - Art Technology Group
066: * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: luehe $
067: **/
068:
069: public class DivideOperator extends BinaryOperator {
070: //-------------------------------------
071: // Singleton
072: //-------------------------------------
073:
074: public static final DivideOperator SINGLETON = new DivideOperator();
075:
076: //-------------------------------------
077: /**
078: *
079: * Constructor
080: **/
081: public DivideOperator() {
082: }
083:
084: //-------------------------------------
085: // Expression methods
086: //-------------------------------------
087: /**
088: *
089: * Returns the symbol representing the operator
090: **/
091: public String getOperatorSymbol() {
092: return "/";
093: }
094:
095: //-------------------------------------
096: /**
097: *
098: * Applies the operator to the given value
099: **/
100: public Object apply(Object pLeft, Object pRight, Logger pLogger)
101: throws ELException {
102: if (pLeft == null && pRight == null) {
103: if (pLogger.isLoggingWarning()) {
104: pLogger.logWarning(Constants.ARITH_OP_NULL,
105: getOperatorSymbol());
106: }
107: return PrimitiveObjects.getInteger(0);
108: }
109:
110: if (Coercions.isBigDecimal(pLeft)
111: || Coercions.isBigInteger(pLeft)
112: || Coercions.isBigDecimal(pRight)
113: || Coercions.isBigInteger(pRight)) {
114:
115: BigDecimal left = (BigDecimal) Coercions
116: .coerceToPrimitiveNumber(pLeft, BigDecimal.class,
117: pLogger);
118: BigDecimal right = (BigDecimal) Coercions
119: .coerceToPrimitiveNumber(pRight, BigDecimal.class,
120: pLogger);
121:
122: try {
123: return left.divide(right, BigDecimal.ROUND_HALF_UP);
124: } catch (Exception exc) {
125: if (pLogger.isLoggingError()) {
126: pLogger.logError(Constants.ARITH_ERROR,
127: getOperatorSymbol(), "" + left, "" + right);
128: }
129: return PrimitiveObjects.getInteger(0);
130: }
131: } else {
132:
133: double left = Coercions.coerceToPrimitiveNumber(pLeft,
134: Double.class, pLogger).doubleValue();
135: double right = Coercions.coerceToPrimitiveNumber(pRight,
136: Double.class, pLogger).doubleValue();
137:
138: try {
139: return PrimitiveObjects.getDouble(left / right);
140: } catch (Exception exc) {
141: if (pLogger.isLoggingError()) {
142: pLogger.logError(Constants.ARITH_ERROR,
143: getOperatorSymbol(), "" + left, "" + right);
144: }
145: return PrimitiveObjects.getInteger(0);
146: }
147: }
148: }
149:
150: //-------------------------------------
151: }
|