Source for org.jfree.formula.function.information.NaFunction

   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: NaFunction.java,v 1.5 2007/04/01 13:51:52 taqua Exp $
  28:  * ------------
  29:  * (C) Copyright 2006-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.formula.function.information;
  32: 
  33: import org.jfree.formula.EvaluationException;
  34: import org.jfree.formula.FormulaContext;
  35: import org.jfree.formula.LibFormulaErrorValue;
  36: import org.jfree.formula.function.Function;
  37: import org.jfree.formula.function.ParameterCallback;
  38: import org.jfree.formula.lvalues.TypeValuePair;
  39: 
  40: /**
  41:  * This function class represents the constant error NA.
  42:  *
  43:  * @author Cedric Pronzato
  44:  *
  45:  */
  46: public class NaFunction implements Function
  47: {
  48:   public NaFunction()
  49:   {
  50:   }
  51: 
  52:   public TypeValuePair evaluate(FormulaContext context, ParameterCallback parameters) throws EvaluationException
  53:   {
  54:     if(parameters.getParameterCount() != 0)
  55:     {
  56:       throw new EvaluationException(LibFormulaErrorValue.ERROR_ARGUMENTS_VALUE);
  57:     }
  58: 
  59:     throw new EvaluationException(LibFormulaErrorValue.ERROR_NA_VALUE);
  60:   }
  61: 
  62:   public String getCanonicalName()
  63:   {
  64:     return "NA";
  65:   }
  66: 
  67: }