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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: DefaultUnaryExpr.java 1261 2006-11-30 18:49:27Z elharo $
46   */
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 DefaultUnaryExpr extends DefaultExpr implements UnaryExpr
57  {
58      /**
59       * 
60       */
61      private static final long serialVersionUID = 2303714238683092334L;
62      private Expr expr;
63  
64      DefaultUnaryExpr(Expr expr)
65      {
66          this.expr = expr;
67      }
68  
69      public Expr getExpr()
70      {
71          return this.expr;
72      }
73  
74      public String toString()
75      {
76          return "[(DefaultUnaryExpr): " + getExpr() + "]";
77      }
78  
79      public String getText()
80      {
81          return "-(" + getExpr().getText() + ")";
82      }
83  
84      public Expr simplify()
85      {
86          expr = expr.simplify();
87  
88          return this;
89      }
90  
91      public Object evaluate(Context context) throws JaxenException
92      {
93          Number number = NumberFunction.evaluate( getExpr().evaluate( context ),
94                                                   context.getNavigator() );
95  
96          return new Double( number.doubleValue() * -1 );
97      }
98      
99  }