Source for org.jfree.formula.typing.ExtendedComparator

   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: ExtendedComparator.java,v 1.4 2007/04/01 13:51:58 taqua Exp $
  28:  * ------------
  29:  * (C) Copyright 2006-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.formula.typing;
  32: 
  33: /**
  34:  * A comparator, that offers type support. Unlike the plain Java-Comparator,
  35:  * this class is able to compare
  36:  *
  37:  * @author Thomas Morgner
  38:  */
  39: public interface ExtendedComparator
  40: {
  41:   public boolean isEqual(final Type type1,
  42:                          final Object value1,
  43:                          final Type type2,
  44:                          final Object value2);
  45: 
  46:   /**
  47:    * Returns null, if the types are not comparable and are not convertible at
  48:    * all.
  49:    *
  50:    * @param type1
  51:    * @param value1
  52:    * @param type2
  53:    * @param value2
  54:    * @return
  55:    */
  56:   public Integer compare(final Type type1,
  57:                          final Object value1,
  58:                          final Type type2,
  59:                          final Object value2);
  60: }