Source for org.jfree.formula.operators.PlusSignOperator

   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: PlusSignOperator.java 2887 2007-06-06 17:07:52Z taqua $
  28:  * ------------
  29:  * (C) Copyright 2006-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.formula.operators;
  32: 
  33: import org.jfree.formula.EvaluationException;
  34: import org.jfree.formula.FormulaContext;
  35: import org.jfree.formula.LibFormulaErrorValue;
  36: import org.jfree.formula.lvalues.TypeValuePair;
  37: 
  38: /**
  39:  * This is a no-op-operator which is equal to "zero plus x".
  40:  *
  41:  * @author Thomas Morgner
  42:  */
  43: public class PlusSignOperator implements PrefixOperator
  44: {
  45:   public PlusSignOperator()
  46:   {
  47:   }
  48: 
  49:   public TypeValuePair evaluate(final FormulaContext context,
  50:                                 final TypeValuePair value1) throws EvaluationException
  51:   {
  52:     if (value1 == null)
  53:     {
  54:       // This is fatal, but should never happen.
  55:       throw new EvaluationException(LibFormulaErrorValue.ERROR_UNEXPECTED_VALUE);
  56:     }
  57:     return value1;
  58:   }
  59: 
  60:   public String toString()
  61:   {
  62:     return "+";
  63:   }
  64: 
  65: }