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 }