Java tutorial
/* * The contents of this file are subject to the terms * of the Common Development and Distribution License * (the License). You may not use this file except in * compliance with the License. * * You can obtain a copy of the License at * https://javaserverfaces.dev.java.net/CDDL.html or * legal/CDDLv1.0.txt. * See the License for the specific language governing * permission and limitations under the License. * * When distributing Covered Code, include this CDDL * Header Notice in each file and include the License file * at legal/CDDLv1.0.txt. * If applicable, add the following below the CDDL Header, * with the fields enclosed by brackets [] replaced by * your own identifying information: * "Portions Copyrighted [year] [name of copyright owner]" * * [Name of File] [ver.__] [Date] * * Copyright 2006 Sun Microsystems Inc. All Rights Reserved */ /* * The Apache Software License, Version 1.1 * * Copyright (c) 1999 The Apache Software Foundation. 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For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package com.sun.faces.el.impl; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import java.math.BigDecimal; /** * <p>The implementation of the divide operator * * @author Nathan Abramson - Art Technology Group * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: ofung $ */ public class DivideOperator extends BinaryOperator { //------------------------------------- // Constants //------------------------------------- private static Log log = LogFactory.getLog(DivideOperator.class); //------------------------------------- // Singleton //------------------------------------- public static final DivideOperator SINGLETON = new DivideOperator(); //------------------------------------- /** * Constructor */ public DivideOperator() { } //------------------------------------- // Expression methods //------------------------------------- /** * Returns the symbol representing the operator */ public String getOperatorSymbol() { return "/"; } //------------------------------------- /** * Applies the operator to the given value */ public Object apply(Object pLeft, Object pRight) throws ElException { if (pLeft == null && pRight == null) { if (log.isWarnEnabled()) { log.warn(MessageUtil.getMessageWithArgs(Constants.ARITH_OP_NULL, getOperatorSymbol())); } return PrimitiveObjects.getInteger(0); } if (Coercions.isBigDecimal(pLeft) || Coercions.isBigInteger(pLeft) || Coercions.isBigDecimal(pRight) || Coercions.isBigInteger(pRight)) { BigDecimal left = (BigDecimal) Coercions.coerceToPrimitiveNumber(pLeft, BigDecimal.class); BigDecimal right = (BigDecimal) Coercions.coerceToPrimitiveNumber(pRight, BigDecimal.class); try { return left.divide(right, BigDecimal.ROUND_HALF_UP); } catch (Exception exc) { if (log.isErrorEnabled()) { String message = MessageUtil.getMessageWithArgs(Constants.ARITH_ERROR, getOperatorSymbol(), "" + left, "" + right); log.error(message); throw new ElException(message); } return PrimitiveObjects.getInteger(0); } } else { double left = Coercions.coerceToPrimitiveNumber(pLeft, Double.class).doubleValue(); double right = Coercions.coerceToPrimitiveNumber(pRight, Double.class).doubleValue(); try { return PrimitiveObjects.getDouble(left / right); } catch (Exception exc) { if (log.isErrorEnabled()) { String message = MessageUtil.getMessageWithArgs(Constants.ARITH_ERROR, getOperatorSymbol(), "" + left, "" + right); log.error(message); throw new ElException(message); } return PrimitiveObjects.getInteger(0); } } } //------------------------------------- }