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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: XorFunction.java,v 1.7 2007/04/01 13:51:53 taqua Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.logical; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.LibFormulaErrorValue; 36: import org.jfree.formula.function.Function; 37: import org.jfree.formula.function.ParameterCallback; 38: import org.jfree.formula.lvalues.TypeValuePair; 39: import org.jfree.formula.typing.Type; 40: import org.jfree.formula.typing.coretypes.LogicalType; 41: 42: /** 43: * Creation-Date: 04.11.2006, 18:28:15 44: * 45: * @author Thomas Morgner 46: */ 47: public class XorFunction implements Function 48: { 49: private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 50: private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 51: 52: 53: public XorFunction() 54: { 55: } 56: 57: public String getCanonicalName() 58: { 59: return "XOR"; 60: } 61: 62: 63: public TypeValuePair evaluate(FormulaContext context, 64: ParameterCallback parameters) 65: throws EvaluationException 66: { 67: if(parameters.getParameterCount() < 1) 68: { 69: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 70: } 71: int count = 0; 72: final int parameterCount = parameters.getParameterCount(); 73: for (int i = 0; i < parameterCount; i++) 74: { 75: final Type conditionType = parameters.getType(i); 76: final Object conditionValue = parameters.getValue(i); 77: final Boolean condition = context.getTypeRegistry().convertToLogical(conditionType, conditionValue); 78: if(condition == null) 79: { 80: throw new EvaluationException(LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 81: } 82: if (Boolean.TRUE.equals(condition)) 83: { 84: count += 1; 85: } 86: } 87: if (count == 1) 88: { 89: return RETURN_TRUE; 90: } 91: else 92: { 93: return RETURN_FALSE; 94: } 95: 96: } 97: }