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: DateFunction.java 2847 2007-05-21 18:57:59Z mimil $ 028 * ------------ 029 * (C) Copyright 2006-2007, by Pentaho Corporation. 030 */ 031 package org.jfree.formula.function.datetime; 032 033 import org.jfree.formula.EvaluationException; 034 import org.jfree.formula.FormulaContext; 035 import org.jfree.formula.LibFormulaErrorValue; 036 import org.jfree.formula.LocalizationContext; 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.TypeRegistry; 041 import org.jfree.formula.typing.coretypes.DateTimeType; 042 import org.jfree.formula.util.DateUtil; 043 044 /** 045 * Creation-Date: 04.11.2006, 18:59:11 046 * 047 * @author Thomas Morgner 048 */ 049 public class DateFunction implements Function 050 { 051 public DateFunction() 052 { 053 } 054 055 public String getCanonicalName() 056 { 057 return "DATE"; 058 } 059 060 public TypeValuePair evaluate(final FormulaContext context, 061 final ParameterCallback parameters) throws EvaluationException 062 { 063 if (parameters.getParameterCount() != 3) 064 { 065 throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 066 } 067 068 final TypeRegistry typeRegistry = context.getTypeRegistry(); 069 070 final Number n1 = typeRegistry.convertToNumber(parameters.getType(0), 071 parameters.getValue(0)); 072 final Number n2 = typeRegistry.convertToNumber(parameters.getType(1), 073 parameters.getValue(1)); 074 final Number n3 = typeRegistry.convertToNumber(parameters.getType(2), 075 parameters.getValue(2)); 076 077 if (n1 == null || n2 == null || n3 == null) 078 { 079 throw new EvaluationException( 080 LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 081 } 082 083 final LocalizationContext localizationContext = context 084 .getLocalizationContext(); 085 final java.sql.Date date = DateUtil.createDate(n1.intValue(), 086 n2.intValue(), n3.intValue(), localizationContext); 087 088 return new TypeValuePair(DateTimeType.DATE_TYPE, date); 089 } 090 }