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1: /** 2: * ========================================= 3: * LibFormula : a free Java formula library 4: * ========================================= 5: * 6: * Project Info: http://reporting.pentaho.org/libformula/ 7: * 8: * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 9: * 10: * This library is free software; you can redistribute it and/or modify it under the terms 11: * of the GNU Lesser General Public License as published by the Free Software Foundation; 12: * either version 2.1 of the License, or (at your option) any later version. 13: * 14: * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 15: * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 16: * See the GNU Lesser General Public License for more details. 17: * 18: * You should have received a copy of the GNU Lesser General Public License along with this 19: * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 20: * Boston, MA 02111-1307, USA. 21: * 22: * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 23: * in the United States and other countries.] 24: * 25: * 26: * ------------ 27: * $Id: ModFunction.java 3521 2007-10-16 10:55:14Z tmorgner $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.math; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.LibFormulaErrorValue; 36: import org.jfree.formula.function.Function; 37: import org.jfree.formula.function.ParameterCallback; 38: import org.jfree.formula.lvalues.TypeValuePair; 39: import org.jfree.formula.typing.Type; 40: import org.jfree.formula.typing.coretypes.NumberType; 41: import org.jfree.formula.util.NumberUtil; 42: 43: import java.math.BigDecimal; 44: 45: /** 46: * This function returns the remainder when one number is divided by another number. 47: * 48: * @author Cedric Pronzato 49: */ 50: public class ModFunction implements Function 51: { 52: public ModFunction() 53: { 54: } 55: 56: public TypeValuePair evaluate(final FormulaContext context, final ParameterCallback parameters) throws EvaluationException 57: { 58: final int parameterCount = parameters.getParameterCount(); 59: if (parameterCount != 2) 60: { 61: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 62: } 63: final Type type1 = parameters.getType(0); 64: final Object value1 = parameters.getValue(0); 65: final BigDecimal divided = NumberUtil.getAsBigDecimal(context.getTypeRegistry().convertToNumber(type1, value1)); 66: final Type type2 = parameters.getType(1); 67: final Object value2 = parameters.getValue(1); 68: final BigDecimal divisor = NumberUtil.getAsBigDecimal(context.getTypeRegistry().convertToNumber(type2, value2)); 69: if(divisor.signum() == 0) 70: { 71: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARITHMETIC_VALUE); 72: } 73: 74: final BigDecimal divide = new BigDecimal(divided.divide(divisor, 0, BigDecimal.ROUND_FLOOR).intValue()); 75: BigDecimal reminder = divided.subtract(divisor.multiply(divide)); 76: if(divide.signum() == 0) 77: { 78: if((divided.signum() == -1 && divisor.signum() != -1) || (divisor.signum() == -1 && divided.signum() != -1)) 79: { 80: reminder = divided.add(divisor); 81: } 82: } 83: 84: return new TypeValuePair(NumberType.GENERIC_NUMBER, reminder); 85: } 86: 87: public String getCanonicalName() 88: { 89: return "MOD"; 90: } 91: