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: MinusSignOperator.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 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 import org.jfree.formula.typing.coretypes.NumberType; 042 043 /** 044 * Creation-Date: 02.11.2006, 10:27:03 045 * 046 * @author Thomas Morgner 047 */ 048 public class MinusSignOperator implements PrefixOperator 049 { 050 private static final BigDecimal ZERO = new BigDecimal(0); 051 052 053 public MinusSignOperator() 054 { 055 } 056 057 public TypeValuePair evaluate(final FormulaContext context, 058 final TypeValuePair value1) 059 throws EvaluationException 060 { 061 final Type type = value1.getType(); 062 final Object val = value1.getValue(); 063 if (val == null) 064 { 065 throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 066 } 067 068 if (type.isFlagSet(Type.NUMERIC_TYPE)) 069 { 070 final TypeRegistry typeRegistry = context.getTypeRegistry(); 071 // return the same as zero minus value. 072 final Number number = typeRegistry.convertToNumber(type, val); 073 final BigDecimal value = getAsBigDecimal(number); 074 return new TypeValuePair(NumberType.GENERIC_NUMBER, ZERO.subtract(value)); 075 } 076 077 if(val instanceof Number) 078 { 079 final BigDecimal value = getAsBigDecimal((Number)val); 080 return new TypeValuePair(type, ZERO.subtract(value)); 081 } 082 083 throw new EvaluationException 084 (LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 085 } 086 087 private BigDecimal getAsBigDecimal(final Number number) 088 { 089 if (number instanceof BigDecimal) 090 { 091 return (BigDecimal) number; 092 } 093 return new BigDecimal(number.toString()); 094 } 095 096 public String toString() 097 { 098 return "-"; 099 } 100 }