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: PercentageOperator.java 4100 2007-11-26 21:04:25Z dkincade $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.operators; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.LibFormulaErrorValue; 036 import org.jfree.formula.lvalues.TypeValuePair; 037 import org.jfree.formula.typing.Type; 038 import org.jfree.formula.typing.TypeRegistry; 039 import org.jfree.formula.typing.coretypes.NumberType; 040 041 import java.math.BigDecimal; 042 043 /** 044 * Creation-Date: 02.11.2006, 10:27:03 045 * 046 * @author Thomas Morgner 047 */ 048 public class PercentageOperator implements PostfixOperator 049 { 050 private static final BigDecimal HUNDRED = new BigDecimal(100); 051 052 053 public PercentageOperator() 054 { 055 } 056 057 058 public TypeValuePair evaluate(final FormulaContext context, final TypeValuePair value1) 059 throws EvaluationException 060 { 061 final Object rawValue = value1.getValue(); 062 if (rawValue == null) 063 { 064 throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 065 } 066 067 final Type type = value1.getType(); 068 final TypeRegistry typeRegistry = context.getTypeRegistry(); 069 070 if (type.isFlagSet(Type.NUMERIC_TYPE) == false && 071 type.isFlagSet(Type.ANY_TYPE) == false) 072 { 073 throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 074 } 075 076 // return the same as zero minus value. 077 final Number number = typeRegistry.convertToNumber(type, rawValue); 078 final BigDecimal value = OperatorUtility.getAsBigDecimal(number); 079 final BigDecimal divide = value.divide(HUNDRED, value.scale()+2,BigDecimal.ROUND_HALF_UP); 080 return new TypeValuePair(NumberType.GENERIC_NUMBER, divide); 081 } 082 083 public String toString() 084 { 085 return "%"; 086 } 087 088 } 089