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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   *
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: DefaultPathExpr.java 1261 2006-11-30 18:49:27Z elharo $
47   */
48  
49  package org.jaxen.expr;
50  
51  
52  import org.jaxen.Context;
53  import org.jaxen.JaxenException;
54  
55  
56  class DefaultPathExpr extends DefaultExpr implements PathExpr {
57  
58      private static final long serialVersionUID = -6593934674727004281L;
59      private Expr filterExpr;
60      private LocationPath locationPath;
61  
62      DefaultPathExpr(Expr filterExpr,
63                             LocationPath locationPath) {
64          this.filterExpr = filterExpr;
65          this.locationPath = locationPath;
66      }
67  
68      public Expr getFilterExpr() {
69          return this.filterExpr;
70      }
71  
72  
73      public void setFilterExpr(Expr filterExpr) {
74          this.filterExpr = filterExpr;
75      }
76  
77  
78      public LocationPath getLocationPath() {
79          return this.locationPath;
80      }
81  
82  
83      public String toString() {
84          if (getLocationPath() != null) {
85              return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]";
86          }
87  
88          return "[(DefaultPathExpr): " + getFilterExpr() + "]";
89      }
90  
91  
92      public String getText() {
93          StringBuffer buf = new StringBuffer();
94  
95          if (getFilterExpr() != null) {
96              buf.append(getFilterExpr().getText());
97          }
98  
99          if (getLocationPath() != null) {
100             if (!getLocationPath().getSteps().isEmpty()) buf.append("/");
101             buf.append(getLocationPath().getText());
102         }
103 
104         return buf.toString();
105     }
106 
107 
108     public Expr simplify() {
109         if (getFilterExpr() != null) {
110             setFilterExpr(getFilterExpr().simplify());
111         }
112 
113         if (getLocationPath() != null) {
114             getLocationPath().simplify();
115         }
116 
117         if (getFilterExpr() == null && getLocationPath() == null) {
118             return null;
119         }
120 
121 
122         if (getLocationPath() == null) {
123             return getFilterExpr();
124         }
125 
126         if (getFilterExpr() == null) {
127             return getLocationPath();
128         }
129 
130         return this;
131     }
132 
133     public Object evaluate(Context context) throws JaxenException {
134         Object results = null;
135         Context pathContext = null;
136         if (getFilterExpr() != null) {
137             results = getFilterExpr().evaluate(context);
138             pathContext = new Context(context.getContextSupport());
139             pathContext.setNodeSet(convertToList(results));
140         }
141         if (getLocationPath() != null) {
142             return getLocationPath().evaluate(pathContext);
143         }
144         return results;
145     }
146     
147 }
148