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 2887 2007-06-06 17:07:52Z 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 import org.jfree.formula.FormulaContext; 037 import org.jfree.formula.LibFormulaErrorValue; 038 import org.jfree.formula.lvalues.TypeValuePair; 039 import org.jfree.formula.typing.Type; 040 import org.jfree.formula.typing.TypeRegistry; 041 042 /** 043 * Creation-Date: 02.11.2006, 10:27:03 044 * 045 * @author Thomas Morgner 046 */ 047 public class PercentageOperator implements PostfixOperator 048 { 049 private static final BigDecimal HUNDRED = new BigDecimal(100); 050 051 052 public PercentageOperator() 053 { 054 } 055 056 057 public TypeValuePair evaluate(final FormulaContext context, final TypeValuePair value1) 058 throws EvaluationException 059 { 060 final Object rawValue = value1.getValue(); 061 if (rawValue == null) 062 { 063 throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 064 } 065 066 final Type type = value1.getType(); 067 final TypeRegistry typeRegistry = context.getTypeRegistry(); 068 069 if (type.isFlagSet(Type.NUMERIC_TYPE) == false && 070 type.isFlagSet(Type.ANY_TYPE) == false) 071 { 072 throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 073 } 074 075 // return the same as zero minus value. 076 final Number number = typeRegistry.convertToNumber(type, rawValue); 077 final BigDecimal value = OperatorUtility.getAsBigDecimal(number); 078 final BigDecimal divide = value.divide(HUNDRED, value.scale()+2,BigDecimal.ROUND_HALF_UP); 079 return new TypeValuePair(type, divide); 080 } 081 082 public String toString() 083 { 084 return "%"; 085 } 086 087 } 088