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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: DateFunction.java,v 1.15 2007/05/21 18:57:59 mimil Exp $ 28: * ------------ 29: * (C) Copyright 2006-2007, by Pentaho Corporation. 30: */ 31: package org.jfree.formula.function.datetime; 32: 33: import org.jfree.formula.EvaluationException; 34: import org.jfree.formula.FormulaContext; 35: import org.jfree.formula.LibFormulaErrorValue; 36: import org.jfree.formula.LocalizationContext; 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.TypeRegistry; 41: import org.jfree.formula.typing.coretypes.DateTimeType; 42: import org.jfree.formula.util.DateUtil; 43: 44: /** 45: * Creation-Date: 04.11.2006, 18:59:11 46: * 47: * @author Thomas Morgner 48: */ 49: public class DateFunction implements Function 50: { 51: public DateFunction() 52: { 53: } 54: 55: public String getCanonicalName() 56: { 57: return "DATE"; 58: } 59: 60: public TypeValuePair evaluate(final FormulaContext context, 61: final ParameterCallback parameters) throws EvaluationException 62: { 63: if (parameters.getParameterCount() != 3) 64: { 65: throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE); 66: } 67: 68: final TypeRegistry typeRegistry = context.getTypeRegistry(); 69: 70: final Number n1 = typeRegistry.convertToNumber(parameters.getType(0), 71: parameters.getValue(0)); 72: final Number n2 = typeRegistry.convertToNumber(parameters.getType(1), 73: parameters.getValue(1)); 74: final Number n3 = typeRegistry.convertToNumber(parameters.getType(2), 75: parameters.getValue(2)); 76: 77: if (n1 == null || n2 == null || n3 == null) 78: { 79: throw new EvaluationException( 80: LibFormulaErrorValue.ERROR_INVALID_ARGUMENT_VALUE); 81: } 82: 83: final LocalizationContext localizationContext = context 84: .getLocalizationContext(); 85: final java.sql.Date date = DateUtil.createDate(n1.intValue(), 86: n2.intValue(), n3.intValue(), localizationContext); 87: 88: return new TypeValuePair(DateTimeType.DATE_TYPE, date); 89: } 90: }