001 /**
002 * =========================================
003 * LibFormula : a free Java formula library
004 * =========================================
005 *
006 * Project Info: http://reporting.pentaho.org/libformula/
007 *
008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 *
026 * ------------
027 * $Id: MultiplyOperator.java 2752 2007-04-10 14:10:41Z taqua $
028 * ------------
029 * (C) Copyright 2006-2007, by Pentaho Corporation.
030 */
031 package org.jfree.formula.operators;
032
033 import java.math.BigDecimal;
034
035 import org.jfree.formula.EvaluationException;
036
037 /**
038 * Creation-Date: 31.10.2006, 16:34:11
039 *
040 * @author Thomas Morgner
041 */
042 public class MultiplyOperator extends AbstractNumericOperator
043 {
044 public MultiplyOperator()
045 {
046 }
047
048 protected Number evaluate(final Number number1, final Number number2) throws EvaluationException
049 {
050 if ((number1 instanceof Integer || number1 instanceof Short) &&
051 (number2 instanceof Integer || number2 instanceof Short))
052 {
053 // this is still safe ..
054 return new BigDecimal(number1.longValue() * number2.longValue());
055 }
056
057 final BigDecimal bd1 = new BigDecimal(number1.toString());
058 final BigDecimal bd2 = new BigDecimal(number2.toString());
059 return bd1.multiply(bd2);
060 }
061
062 public int getLevel()
063 {
064 return 100;
065 }
066
067 public String toString()
068 {
069 return "*";
070 }
071
072 public boolean isLeftOperation()
073 {
074 return true;
075 }
076
077 /**
078 * Defines, whether the operation is associative. For associative operations,
079 * the evaluation order does not matter, if the operation appears more than
080 * once in an expression, and therefore we can optimize them a lot better than
081 * non-associative operations (ie. merge constant parts and precompute them
082 * once).
083 *
084 * @return true, if the operation is associative, false otherwise
085 */
086 public boolean isAssociative()
087 {
088 return true;
089 }
090
091 }