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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: MinusSignOperator.java 2887 2007-06-06 17:07:52Z taqua $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.operators; 32: 33: import java.math.BigDecimal; 34: 35: import org.jfree.formula.EvaluationException; 36: import org.jfree.formula.FormulaContext; 37: import org.jfree.formula.LibFormulaErrorValue; 38: import org.jfree.formula.lvalues.TypeValuePair; 39: import org.jfree.formula.typing.Type; 40: import org.jfree.formula.typing.TypeRegistry; 41: 42: /** 43: * Creation-Date: 02.11.2006, 10:27:03 44: * 45: * @author Thomas Morgner 46: */ 47: public class MinusSignOperator implements PrefixOperator 48: { 49: private static final BigDecimal ZERO = new BigDecimal(0); 50: 51: 52: public MinusSignOperator() 53: { 54: } 55: 56: public TypeValuePair evaluate(final FormulaContext context, 57: final TypeValuePair value1) 58: throws EvaluationException 59: { 60: final Type type = value1.getType(); 61: final Object val = value1.getValue(); 62: if (val == null) 63: { 64: throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE); 65: } 66: 67: if (type.isFlagSet(Type.NUMERIC_TYPE)) 68: { 69: final TypeRegistry typeRegistry = context.getTypeRegistry(); 70: // return the same as zero minus value. 71: final Number number = typeRegistry.convertToNumber(type, val); 72: final BigDecimal value = getAsBigDecimal(number); 73: return new TypeValuePair(type, ZERO.subtract(value)); 74: } 75: 76: if(val instanceof Number) 77: { 78: final BigDecimal value = getAsBigDecimal((Number)val); 79: return new TypeValuePair(type, ZERO.subtract(value)); 80: } 81: 82: throw new EvaluationException 83: (LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 84: } 85: 86: private BigDecimal getAsBigDecimal(final Number number) 87: { 88: if (number instanceof BigDecimal) 89: { 90: return (BigDecimal) number; 91: } 92: return new BigDecimal(number.toString()); 93: } 94: 95: public String toString() 96: { 97: return "-"; 98: } 99: }