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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: IsNumberFunction.java,v 1.1 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 retruns true if the given value is of type Number. 44: * 45: * @author Cedric Pronzato 46: * 47: */ 48: public class IsNumberFunction implements Function 49: { 50: private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 51: private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 52: 53: public IsNumberFunction() 54: { 55: } 56: 57: public TypeValuePair evaluate(FormulaContext context, ParameterCallback parameters) throws EvaluationException 58: { 59: final int parameterCount = parameters.getParameterCount(); 60: if (parameterCount < 1) 61: { 62: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 63: } 64: 65: final Type type1 = parameters.getType(0); 66: if(type1.isFlagSet(Type.NUMERIC_TYPE)) 67: { 68: return RETURN_TRUE; 69: } 70: 71: return RETURN_FALSE; 72: } 73: 74: public String getCanonicalName() 75: { 76: return "ISNUMBER"; 77: } 78: 79: }