Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
JavaBeanXPath |
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1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/javabean/JavaBeanXPath.java,v 1.6 2006/06/03 20:36:00 elharo Exp $ | |
3 | * $Revision: 1.6 $ | |
4 | * $Date: 2006/06/03 20:36:00 $ | |
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: JavaBeanXPath.java,v 1.6 2006/06/03 20:36:00 elharo Exp $ | |
46 | */ | |
47 | ||
48 | package org.jaxen.javabean; | |
49 | ||
50 | import org.jaxen.Context; | |
51 | import org.jaxen.BaseXPath; | |
52 | import org.jaxen.JaxenException; | |
53 | ||
54 | import java.util.List; | |
55 | import java.util.ArrayList; | |
56 | import java.util.Collection; | |
57 | import java.util.Iterator; | |
58 | ||
59 | /** An XPath implementation for JavaBeans. | |
60 | * | |
61 | * <p>This is the main entry point for matching an XPath against a JavaBean | |
62 | * tree. You create a compiled XPath object, then match it against | |
63 | * one or more context nodes using the {@link #selectNodes(Object)} | |
64 | * method, as in the following example:</p> | |
65 | * | |
66 | * <pre> | |
67 | * Node node = ...; | |
68 | * XPath path = new JavaBeanXPath("a/b/c"); | |
69 | * List results = path.selectNodes(node); | |
70 | * </pre> | |
71 | * | |
72 | * @see BaseXPath | |
73 | * | |
74 | * @author <a href="mailto:bob@werken.com">bob mcwhirter</a> | |
75 | * | |
76 | * @version $Revision: 1.6 $ | |
77 | */ | |
78 | public class JavaBeanXPath extends BaseXPath | |
79 | { | |
80 | /** | |
81 | * | |
82 | */ | |
83 | private static final long serialVersionUID = -1567521943360266313L; | |
84 | ||
85 | /** Construct given an XPath expression string. | |
86 | * | |
87 | * @param xpathExpr The XPath expression. | |
88 | * | |
89 | * @throws JaxenException if there is a syntax error while | |
90 | * parsing the expression | |
91 | */ | |
92 | public JavaBeanXPath(String xpathExpr) throws JaxenException | |
93 | { | |
94 | 2 | super( xpathExpr, DocumentNavigator.getInstance() ); |
95 | 2 | } |
96 | ||
97 | protected Context getContext(Object node) | |
98 | { | |
99 | 2 | if ( node instanceof Context ) |
100 | { | |
101 | 0 | return (Context) node; |
102 | } | |
103 | ||
104 | 2 | if ( node instanceof Element ) |
105 | { | |
106 | 0 | return super.getContext( node ); |
107 | } | |
108 | ||
109 | 2 | if ( node instanceof List ) |
110 | { | |
111 | 0 | List newList = new ArrayList(); |
112 | ||
113 | 0 | for ( Iterator listIter = ((List)node).iterator(); |
114 | 0 | listIter.hasNext(); ) |
115 | { | |
116 | 0 | newList.add( new Element( null, "root", listIter.next() ) ); |
117 | 0 | } |
118 | ||
119 | 0 | return super.getContext( newList ); |
120 | } | |
121 | ||
122 | 2 | return super.getContext( new Element( null, "root", node ) ); |
123 | } | |
124 | ||
125 | public Object evaluate(Object node) | |
126 | throws JaxenException | |
127 | { | |
128 | 2 | Object result = super.evaluate( node ); |
129 | ||
130 | 2 | if ( result instanceof Element ) |
131 | { | |
132 | 0 | return ((Element)result).getObject(); |
133 | } | |
134 | 2 | else if ( result instanceof Collection ) |
135 | { | |
136 | 2 | List newList = new ArrayList(); |
137 | ||
138 | 2 | for ( Iterator listIter = ((Collection)result).iterator(); |
139 | 8 | listIter.hasNext(); ) |
140 | { | |
141 | 6 | Object member = listIter.next(); |
142 | ||
143 | 6 | if ( member instanceof Element ) |
144 | { | |
145 | 6 | newList.add( ((Element)member).getObject() ); |
146 | 6 | } |
147 | else | |
148 | { | |
149 | 0 | newList.add( member ); |
150 | } | |
151 | 6 | } |
152 | ||
153 | 2 | return newList; |
154 | } | |
155 | ||
156 | 0 | return result; |
157 | } | |
158 | } |