View Javadoc

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   *
12   * Redistribution and use in source and binary forms, with or without
13   * modification, are permitted provided that the following conditions are
14   * met:
15   * 
16   *   * Redistributions of source code must retain the above copyright
17   *     notice, this list of conditions and the following disclaimer.
18   * 
19   *   * Redistributions in binary form must reproduce the above copyright
20   *     notice, this list of conditions and the following disclaimer in the
21   *     documentation and/or other materials provided with the distribution.
22   * 
23   *   * Neither the name of the Jaxen Project nor the names of its
24   *     contributors may be used to endorse or promote products derived 
25   *     from this software without specific prior written permission.
26   * 
27   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
28   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
30   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
31   * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
32   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
33   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
34   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
35   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
36   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
37   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
38   *
39   * ====================================================================
40   * This software consists of voluntary contributions made by many
41   * individuals on behalf of the Jaxen Project and was originally
42   * created by bob mcwhirter <bob@werken.com> and
43   * James Strachan <jstrachan@apache.org>.  For more information on the
44   * Jaxen Project, please see <http://www.jaxen.org/>.
45   *
46   * $Id: DefaultMinusExpr.java 1261 2006-11-30 18:49:27Z elharo $
47   */
48  
49  
50  package org.jaxen.expr;
51  
52  import org.jaxen.Context;
53  import org.jaxen.JaxenException;
54  import org.jaxen.function.NumberFunction;
55  
56  class DefaultMinusExpr extends DefaultAdditiveExpr
57  {
58      /**
59       * 
60       */
61      private static final long serialVersionUID = 6468563688098527800L;
62  
63      DefaultMinusExpr(Expr lhs,
64                              Expr rhs)
65      {
66          super( lhs,
67                 rhs );
68      }
69  
70      public String getOperator()
71      {
72          return "-";
73      }
74  
75      public Object evaluate(Context context) throws JaxenException
76      {
77          Number lhsValue = NumberFunction.evaluate( getLHS().evaluate( context ),
78                                                     context.getNavigator() );
79          Number rhsValue = NumberFunction.evaluate( getRHS().evaluate( context ),
80                                                     context.getNavigator() );
81  
82          double result = lhsValue.doubleValue() - rhsValue.doubleValue();
83          return new Double( result );
84      }
85  
86  }