Source for org.jfree.formula.operators.LesserOperator

   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: LesserOperator.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: /**
  34:  * Creation-Date: 31.10.2006, 16:34:11
  35:  *
  36:  * @author Thomas Morgner
  37:  */
  38: public class LesserOperator extends AbstractCompareOperator
  39: {
  40:   public LesserOperator()
  41:   {
  42:   }
  43: 
  44:   protected boolean evaluate(final int compareResult)
  45:   {
  46:     return compareResult < 0;
  47:   }
  48: 
  49:   public int getLevel()
  50:   {
  51:     return 400;
  52:   }
  53: 
  54:   public boolean isLeftOperation()
  55:   {
  56:     return true;
  57:   }
  58: 
  59:   /**
  60:    * Defines, whether the operation is associative. For associative operations,
  61:    * the evaluation order does not matter, if the operation appears more than
  62:    * once in an expression, and therefore we can optimize them a lot better than
  63:    * non-associative operations (ie. merge constant parts and precompute them
  64:    * once).
  65:    *
  66:    * @return true, if the operation is associative, false otherwise
  67:    */
  68:   public boolean isAssociative()
  69:   {
  70:     return false;
  71:   }
  72: 
  73:   /**
  74:    * returns the string representation of this operator.
  75:    *
  76:    * @return string
  77:    */
  78:   public String toString()
  79:   {
  80:     return "<";
  81:   }
  82: }