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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: IsLogicalFunction.java,v 1.6 2007/05/07 23:00:37 mimil Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.information; 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: * This function checks whatever the given value is of Logical type. 44: * 45: * @author Cedric Pronzato 46: * 47: */ 48: public class IsLogicalFunction implements Function 49: { 50: private static final TypeValuePair RETURN_TRUE = new TypeValuePair( 51: LogicalType.TYPE, Boolean.TRUE); 52: 53: private static final TypeValuePair RETURN_FALSE = new TypeValuePair( 54: LogicalType.TYPE, Boolean.FALSE); 55: 56: public IsLogicalFunction() 57: { 58: } 59: 60: public TypeValuePair evaluate(FormulaContext context, 61: ParameterCallback parameters) throws EvaluationException 62: { 63: final int parameterCount = parameters.getParameterCount(); 64: if (parameterCount < 1) 65: { 66: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 67: } 68: 69: final Type type1 = parameters.getType(0); 70: final Object value1 = parameters.getValue(0); 71: if(value1 instanceof Boolean || type1.isFlagSet(Type.LOGICAL_TYPE)) 72: { 73: return RETURN_TRUE; 74: } 75: 76: // we don't want the auto convertion of paramaters (paramerter.getValue) so 77: // we run the evaluate method ourself 78: // final TypeValuePair eval = parameters.getRaw(0).evaluate(); 79: // if (eval.getType().isFlagSet(Type.LOGICAL_TYPE)) 80: // { 81: // return RETURN_TRUE; 82: // } 83: 84: return RETURN_FALSE; 85: } 86: 87: public String getCanonicalName() 88: { 89: return "ISLOGICAL"; 90: } 91: 92: }