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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: AbstractNumericOperator.java 2887 2007-06-06 17:07:52Z taqua $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: 32: package org.jfree.formula.operators; 33: 34: import org.jfree.formula.EvaluationException; 35: import org.jfree.formula.FormulaContext; 36: import org.jfree.formula.LibFormulaErrorValue; 37: import org.jfree.formula.lvalues.TypeValuePair; 38: import org.jfree.formula.typing.TypeRegistry; 39: import org.jfree.formula.typing.TypeRegistryUtility; 40: import org.jfree.formula.typing.coretypes.NumberType; 41: 42: /** 43: * Creation-Date: 10.04.2007, 15:02:39 44: * 45: * @author Thomas Morgner 46: */ 47: public abstract class AbstractNumericOperator implements InfixOperator 48: { 49: protected static final Number ZERO = new Integer(0); 50: 51: protected AbstractNumericOperator() 52: { 53: } 54: 55: public final TypeValuePair evaluate(final FormulaContext context, 56: final TypeValuePair value1, 57: final TypeValuePair value2) 58: throws EvaluationException 59: { 60: final TypeRegistry typeRegistry = context.getTypeRegistry(); 61: 62: if (value1 == null || value2 == null) 63: { 64: // If this happens, then one of the implementations has messed up. 65: throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE); 66: } 67: 68: final Object raw1 = value1.getValue(); 69: final Object raw2 = value2.getValue(); 70: if (raw1 == null || raw2 == null) 71: { 72: throw new EvaluationException (LibFormulaErrorValue.ERROR_NA_VALUE); 73: } 74: 75: final Number number1 = TypeRegistryUtility.convertToNumber(typeRegistry, value1.getType(), raw1, ZERO); 76: final Number number2 = TypeRegistryUtility.convertToNumber(typeRegistry, value2.getType(), raw2, ZERO); 77: return new TypeValuePair(NumberType.GENERIC_NUMBER, evaluate(number1, number2)); 78: } 79: 80: protected abstract Number evaluate (final Number number1, final Number number2) throws EvaluationException; 81: }