001 /** 002 * ========================================= 003 * LibFormula : a free Java formula library 004 * ========================================= 005 * 006 * Project Info: http://reporting.pentaho.org/libformula/ 007 * 008 * (C) Copyright 2006-2007, by Pentaho Corporation and Contributors. 009 * 010 * This library is free software; you can redistribute it and/or modify it under the terms 011 * of the GNU Lesser General Public License as published by the Free Software Foundation; 012 * either version 2.1 of the License, or (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 016 * See the GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public License along with this 019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 020 * Boston, MA 02111-1307, USA. 021 * 022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 023 * in the United States and other countries.] 024 * 025 * 026 * ------------ 027 * $Id: IsErrFunction.java 2887 2007-06-06 17:07:52Z taqua $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.function.information; 032 033 import org.jfree.formula.ErrorValue; 034 import org.jfree.formula.EvaluationException; 035 import org.jfree.formula.FormulaContext; 036 import org.jfree.formula.LibFormulaErrorValue; 037 import org.jfree.formula.function.Function; 038 import org.jfree.formula.function.ParameterCallback; 039 import org.jfree.formula.lvalues.TypeValuePair; 040 import org.jfree.formula.typing.Type; 041 import org.jfree.formula.typing.coretypes.ErrorType; 042 import org.jfree.formula.typing.coretypes.LogicalType; 043 import org.jfree.util.Log; 044 045 /** 046 * This function returns true if the parameter is of error and not of error type NA. 047 * 048 * @author Cedric Pronzato 049 */ 050 public class IsErrFunction implements Function 051 { 052 053 private static final TypeValuePair RETURN_TRUE = new TypeValuePair(LogicalType.TYPE, Boolean.TRUE); 054 private static final TypeValuePair RETURN_FALSE = new TypeValuePair(LogicalType.TYPE, Boolean.FALSE); 055 056 public IsErrFunction() 057 { 058 } 059 060 public TypeValuePair evaluate(final FormulaContext context, 061 final ParameterCallback parameters) throws EvaluationException 062 { 063 if (parameters.getParameterCount() != 1) 064 { 065 throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 066 } 067 068 try 069 { 070 final Type type = parameters.getType(0); 071 final Object value = parameters.getValue(0); 072 073 if (ErrorType.TYPE.equals(type) && value instanceof ErrorValue) 074 { 075 Log.warn ("Passing errors around is deprecated. Throw exceptions instead."); 076 final ErrorValue na = (ErrorValue) value; 077 if (na.getErrorCode() == LibFormulaErrorValue.ERROR_NA) 078 { 079 return RETURN_FALSE; 080 } 081 else 082 { 083 return RETURN_TRUE; 084 } 085 } 086 } 087 catch (EvaluationException e) 088 { 089 if (e.getErrorValue().getErrorCode() == LibFormulaErrorValue.ERROR_NA) 090 { 091 return RETURN_FALSE; 092 } 093 else 094 { 095 return RETURN_TRUE; 096 } 097 } 098 099 return RETURN_FALSE; 100 } 101 102 public String getCanonicalName() 103 { 104 return "ISERR"; 105 } 106 107 }