1 /*
2 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultUnaryExpr.java,v 1.16 2006/11/30 18:49:27 elharo Exp $
3 * $Revision: 1.16 $
4 * $Date: 2006/11/30 18:49:27 $
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,v 1.16 2006/11/30 18:49:27 elharo Exp $
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 }