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"
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033: * permission of the Apache Group.
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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
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045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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049: * This software consists of voluntary contributions made by many
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054: */
055:
056: package org.apache.commons.el;
057:
058: import javax.servlet.jsp.el.ELException;
059: import java.math.BigInteger;
060:
061: /**
062: *
063: * <p>The implementation of the modulus 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 ModulusOperator extends BinaryOperator {
070: //-------------------------------------
071: // Singleton
072: //-------------------------------------
073:
074: public static final ModulusOperator SINGLETON = new ModulusOperator();
075:
076: //-------------------------------------
077: /**
078: *
079: * Constructor
080: **/
081: public ModulusOperator() {
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 ((pLeft != null && (Coercions.isFloatingPointType(pLeft) || Coercions
111: .isFloatingPointString(pLeft)))
112: || Coercions.isBigDecimal(pLeft)
113: || (pRight != null && (Coercions
114: .isFloatingPointType(pRight)
115: || Coercions.isFloatingPointString(pRight) || Coercions
116: .isBigDecimal(pRight)))) {
117: double left = Coercions.coerceToPrimitiveNumber(pLeft,
118: Double.class, pLogger).doubleValue();
119: double right = Coercions.coerceToPrimitiveNumber(pRight,
120: Double.class, pLogger).doubleValue();
121:
122: try {
123: return PrimitiveObjects.getDouble(left % right);
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 if (Coercions.isBigInteger(pLeft)
132: || Coercions.isBigInteger(pRight)) {
133: BigInteger left = (BigInteger) Coercions
134: .coerceToPrimitiveNumber(pLeft, BigInteger.class,
135: pLogger);
136: BigInteger right = (BigInteger) Coercions
137: .coerceToPrimitiveNumber(pRight, BigInteger.class,
138: pLogger);
139:
140: try {
141: return left.remainder(right);
142: } catch (Exception exc) {
143: if (pLogger.isLoggingError()) {
144: pLogger.logError(Constants.ARITH_ERROR,
145: getOperatorSymbol(), "" + left, "" + right);
146: }
147: return PrimitiveObjects.getInteger(0);
148: }
149: } else {
150: long left = Coercions.coerceToPrimitiveNumber(pLeft,
151: Long.class, pLogger).longValue();
152: long right = Coercions.coerceToPrimitiveNumber(pRight,
153: Long.class, pLogger).longValue();
154:
155: try {
156: return PrimitiveObjects.getLong(left % right);
157: } catch (Exception exc) {
158: if (pLogger.isLoggingError()) {
159: pLogger.logError(Constants.ARITH_ERROR,
160: getOperatorSymbol(), "" + left, "" + right);
161: }
162: return PrimitiveObjects.getInteger(0);
163: }
164: }
165: }
166:
167: //-------------------------------------
168: }
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