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1   /*
2    * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultPathExpr.java,v 1.10 2003/08/26 19:54:15 ssanders Exp $
3    * $Revision: 1.10 $
4    * $Date: 2003/08/26 19:54:15 $
5    *
6    * ====================================================================
7    *
8    * Copyright (C) 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
13   * are met:
14   *
15   * 1. Redistributions of source code must retain the above copyright
16   *    notice, this list of conditions, and the following disclaimer.
17   *
18   * 2. Redistributions in binary form must reproduce the above copyright
19   *    notice, this list of conditions, and the disclaimer that follows
20   *    these conditions in the documentation and/or other materials
21   *    provided with the distribution.
22   *
23   * 3. The name "Jaxen" must not be used to endorse or promote products
24   *    derived from this software without prior written permission.  For
25   *    written permission, please contact license@jaxen.org.
26   *
27   * 4. Products derived from this software may not be called "Jaxen", nor
28   *    may "Jaxen" appear in their name, without prior written permission
29   *    from the Jaxen Project Management (pm@jaxen.org).
30   *
31   * In addition, we request (but do not require) that you include in the
32   * end-user documentation provided with the redistribution and/or in the
33   * software itself an acknowledgement equivalent to the following:
34   *     "This product includes software developed by the
35   *      Jaxen Project (http://www.jaxen.org/)."
36   * Alternatively, the acknowledgment may be graphical using the logos
37   * available at http://www.jaxen.org/
38   *
39   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42   * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50   * SUCH DAMAGE.
51   *
52   * ====================================================================
53   * This software consists of voluntary contributions made by many
54   * individuals on behalf of the Jaxen Project and was originally
55   * created by bob mcwhirter <bob@werken.com> and
56   * James Strachan <jstrachan@apache.org>.  For more information on the
57   * Jaxen Project, please see <http://www.jaxen.org/>.
58   *
59   * $Id: DefaultPathExpr.java,v 1.10 2003/08/26 19:54:15 ssanders Exp $
60   */
61  
62  package org.jaxen.expr;
63  
64  
65  import org.jaxen.Context;
66  import org.jaxen.JaxenException;
67  
68  
69  class DefaultPathExpr extends DefaultExpr implements PathExpr {
70  
71      private Expr filterExpr;
72      private LocationPath locationPath;
73  
74      public DefaultPathExpr(Expr filterExpr,
75                             LocationPath locationPath) {
76          this.filterExpr = filterExpr;
77          this.locationPath = locationPath;
78      }
79  
80      public Expr getFilterExpr() {
81          return this.filterExpr;
82      }
83  
84  
85      public void setFilterExpr(Expr filterExpr) {
86          this.filterExpr = filterExpr;
87      }
88  
89  
90      public LocationPath getLocationPath() {
91          return this.locationPath;
92      }
93  
94  
95      public String toString() {
96          if (getLocationPath() != null) {
97              return "[(DefaultPathExpr): " + getFilterExpr() + ", " + getLocationPath() + "]";
98          }
99  
100         return "[(DefaultPathExpr): " + getFilterExpr() + "]";
101     }
102 
103 
104     public String getText() {
105         StringBuffer buf = new StringBuffer();
106 
107         if (getFilterExpr() != null) {
108             buf.append(getFilterExpr().getText());
109         }
110 
111         if (getLocationPath() != null) {
112             buf.append(getLocationPath().getText());
113         }
114 
115         return buf.toString();
116     }
117 
118 
119     public Expr simplify() {
120         if (getFilterExpr() != null) {
121             setFilterExpr(getFilterExpr().simplify());
122         }
123 
124         if (getLocationPath() != null) {
125             getLocationPath().simplify();
126         }
127 
128         if (getFilterExpr() == null && getLocationPath() == null) {
129             return null;
130         }
131 
132 
133         if (getLocationPath() == null) {
134             return getFilterExpr();
135         }
136 
137         if (getFilterExpr() == null) {
138             return getLocationPath();
139         }
140 
141         return this;
142     }
143 
144     public Object evaluate(Context context) throws JaxenException {
145         Object results = null;
146         Context pathContext = null;
147         if (getFilterExpr() != null) {
148             results = getFilterExpr().evaluate(context);
149             pathContext = new Context(context.getContextSupport());
150             pathContext.setNodeSet(convertToList(results));
151         }
152         if (getLocationPath() != null) {
153             return getLocationPath().evaluate(pathContext);
154         }
155         return results;
156     }
157 
158     public void accept(Visitor visitor) {
159         visitor.visit(this);
160     }
161 }
162