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: AbstractNumericOperator.java 2887 2007-06-06 17:07:52Z taqua $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 032 package org.jfree.formula.operators; 033 034 import org.jfree.formula.EvaluationException; 035 import org.jfree.formula.FormulaContext; 036 import org.jfree.formula.LibFormulaErrorValue; 037 import org.jfree.formula.lvalues.TypeValuePair; 038 import org.jfree.formula.typing.TypeRegistry; 039 import org.jfree.formula.typing.TypeRegistryUtility; 040 import org.jfree.formula.typing.coretypes.NumberType; 041 042 /** 043 * Creation-Date: 10.04.2007, 15:02:39 044 * 045 * @author Thomas Morgner 046 */ 047 public abstract class AbstractNumericOperator implements InfixOperator 048 { 049 protected static final Number ZERO = new Integer(0); 050 051 protected AbstractNumericOperator() 052 { 053 } 054 055 public final TypeValuePair evaluate(final FormulaContext context, 056 final TypeValuePair value1, 057 final TypeValuePair value2) 058 throws EvaluationException 059 { 060 final TypeRegistry typeRegistry = context.getTypeRegistry(); 061 062 if (value1 == null || value2 == null) 063 { 064 // If this happens, then one of the implementations has messed up. 065 throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE); 066 } 067 068 final Object raw1 = value1.getValue(); 069 final Object raw2 = value2.getValue(); 070 if (raw1 == null || raw2 == null) 071 { 072 throw new EvaluationException (LibFormulaErrorValue.ERROR_NA_VALUE); 073 } 074 075 final Number number1 = TypeRegistryUtility.convertToNumber(typeRegistry, value1.getType(), raw1, ZERO); 076 final Number number2 = TypeRegistryUtility.convertToNumber(typeRegistry, value2.getType(), raw2, ZERO); 077 return new TypeValuePair(NumberType.GENERIC_NUMBER, evaluate(number1, number2)); 078 } 079 080 protected abstract Number evaluate (final Number number1, final Number number2) throws EvaluationException; 081 }