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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: IsNaFunction.java,v 1.6 2007/06/06 17:07:52 taqua Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.information; 32: 33: import org.jfree.formula.ErrorValue; 34: import org.jfree.formula.EvaluationException; 35: import org.jfree.formula.FormulaContext; 36: import org.jfree.formula.LibFormulaErrorValue; 37: import org.jfree.formula.function.Function; 38: import org.jfree.formula.function.ParameterCallback; 39: import org.jfree.formula.lvalues.TypeValuePair; 40: import org.jfree.formula.typing.Type; 41: import org.jfree.formula.typing.coretypes.ErrorType; 42: import org.jfree.formula.typing.coretypes.LogicalType; 43: import org.jfree.util.Log; 44: 45: /** 46: * This function returns true if the parameter is of error type NA. 47: * 48: * @author Cedric Pronzato 49: */ 50: public class IsNaFunction implements Function 51: { 52: 53: private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 54: private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 55: 56: public IsNaFunction() 57: { 58: } 59: 60: public TypeValuePair evaluate(final FormulaContext context, 61: final ParameterCallback parameters) throws EvaluationException 62: { 63: if (parameters.getParameterCount() != 1) 64: { 65: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 66: } 67: 68: try 69: { 70: final Type type = parameters.getType(0); 71: final Object value = parameters.getValue(0); 72: 73: if (ErrorType.TYPE.equals(type) && value instanceof ErrorValue) 74: { 75: Log.warn ("Passing errors around is deprecated. Throw exceptions instead."); 76: final ErrorValue na = (ErrorValue) value; 77: if (na.getErrorCode() == LibFormulaErrorValue.ERROR_NA) 78: { 79: return RETURN_TRUE; 80: } 81: } 82: else 83: { 84: if (value == null) 85: { 86: return RETURN_TRUE; 87: } 88: } 89: } 90: catch (EvaluationException e) 91: { 92: if (e.getErrorValue().getErrorCode() == LibFormulaErrorValue.ERROR_NA) 93: { 94: return RETURN_TRUE; 95: } 96: } 97: 98: return RETURN_FALSE; 99: } 100: 101: public String getCanonicalName() 102: { 103: return "ISNA"; 104: } 105: 106: }