Source for org.jfree.formula.function.datetime.DateFunction

   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: }