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1   /*
2    * $Header$
3    * $Revision: 1261 $
4    * $Date: 2006-11-30 10:49:27 -0800 (Thu, 30 Nov 2006) $
5    *
6    * ====================================================================
7    *
8    * Copyright 2000-2002 bob mcwhirter & James Strachan.
9    * All rights reserved.
10   *
11   * Redistribution and use in source and binary forms, with or without
12   * modification, are permitted provided that the following conditions are
13   * met:
14   * 
15   *   * Redistributions of source code must retain the above copyright
16   *     notice, this list of conditions and the following disclaimer.
17   * 
18   *   * Redistributions in binary form must reproduce the above copyright
19   *     notice, this list of conditions and the following disclaimer in the
20   *     documentation and/or other materials provided with the distribution.
21   * 
22   *   * Neither the name of the Jaxen Project nor the names of its
23   *     contributors may be used to endorse or promote products derived 
24   *     from this software without specific prior written permission.
25   * 
26   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
30   * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37   *
38   * ====================================================================
39   * This software consists of voluntary contributions made by many 
40   * individuals on behalf of the Jaxen Project and was originally 
41   * created by bob mcwhirter <bob@werken.com> and 
42   * James Strachan <jstrachan@apache.org>.  For more information on the 
43   * Jaxen Project, please see <http://www.jaxen.org/>.
44   * 
45   * $Id: DefaultNotEqualsExpr.java 1261 2006-11-30 18:49:27Z elharo $
46   */
47  
48  
49  
50  package org.jaxen.expr;
51  
52  import org.jaxen.function.NumberFunction;
53  
54  class DefaultNotEqualsExpr extends DefaultEqualityExpr 
55    {
56    /**
57       * 
58       */
59      private static final long serialVersionUID = -8001267398136979152L;
60  
61  DefaultNotEqualsExpr( Expr lhs, Expr rhs )
62      {
63      super( lhs, rhs );
64      }
65  
66    public String getOperator()
67      {
68      return "!=";
69      }
70  
71    public String toString()
72      {
73      return "[(DefaultNotEqualsExpr): " + getLHS() + ", " + getRHS() + "]";
74      }
75    
76      protected boolean evaluateObjectObject( Object lhs, Object rhs )
77      {
78          if( eitherIsNumber( lhs, rhs ) )
79          {
80      
81              if( NumberFunction.isNaN( (Double) lhs ) || NumberFunction.isNaN( (Double) rhs ) )
82              {
83                  return true;
84              }
85      
86          }
87          return !lhs.equals( rhs );
88      }
89      
90  }