Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
JXPathExtractor |
|
| 2.2;2.2 |
1 | /* | |
2 | * $Id: JXPathExtractor.java 7963 2007-08-21 08:53:15Z dirk.olmes $ | |
3 | * -------------------------------------------------------------------------------------- | |
4 | * Copyright (c) MuleSource, Inc. All rights reserved. http://www.mulesource.com | |
5 | * | |
6 | * The software in this package is published under the terms of the CPAL v1.0 | |
7 | * license, a copy of which has been included with this distribution in the | |
8 | * LICENSE.txt file. | |
9 | */ | |
10 | ||
11 | package org.mule.transformers.xml; | |
12 | ||
13 | import org.mule.transformers.AbstractTransformer; | |
14 | import org.mule.umo.transformer.TransformerException; | |
15 | ||
16 | import java.util.ArrayList; | |
17 | import java.util.List; | |
18 | ||
19 | import org.apache.commons.jxpath.JXPathContext; | |
20 | import org.dom4j.Document; | |
21 | import org.dom4j.DocumentHelper; | |
22 | import org.dom4j.Node; | |
23 | import org.dom4j.XPath; | |
24 | ||
25 | /** | |
26 | * The JXPathExtractor is a simple transformer that evaluates an xpath expression | |
27 | * against the given bean and that returns the result. <p/> By default, a single | |
28 | * result will be returned. If multiple values are expected, set the | |
29 | * {@link #singleResult} property to <code>false</code>. In this case a | |
30 | * {@link List} of values will be returned. Note the property is currently ignored | |
31 | * for non-String/XML payloads. | |
32 | */ | |
33 | 6 | public class JXPathExtractor extends AbstractTransformer |
34 | { | |
35 | ||
36 | private volatile String expression; | |
37 | ||
38 | 6 | private volatile boolean singleResult = true; |
39 | ||
40 | /** | |
41 | * Evaluate the expression in the context of the given object and returns the | |
42 | * result. If the given object is a string, it assumes it is an valid xml and | |
43 | * parses it before evaluating the xpath expression. | |
44 | */ | |
45 | public Object doTransform(Object src, String encoding) throws TransformerException | |
46 | { | |
47 | try | |
48 | { | |
49 | Object result; | |
50 | 6 | if (src instanceof String) |
51 | { | |
52 | 6 | Document doc = DocumentHelper.parseText((String)src); |
53 | 6 | if (singleResult) |
54 | { | |
55 | 2 | result = doc.valueOf(expression); |
56 | } | |
57 | else | |
58 | { | |
59 | 4 | XPath xpath = doc.createXPath(expression); |
60 | // TODO handle non-list cases, see | |
61 | // http://www.dom4j.org/apidocs/org/dom4j/XPath.html#evaluate(java.lang.Object) | |
62 | 4 | List obj = (List)xpath.evaluate(doc); |
63 | 4 | result = new ArrayList(obj.size()); |
64 | 18 | for (int i = 0; i < obj.size(); i++) |
65 | { | |
66 | 14 | final Node node = (Node)obj.get(i); |
67 | 14 | ((List)result).add(node.getText()); |
68 | } | |
69 | } | |
70 | 6 | } |
71 | else | |
72 | { | |
73 | 0 | JXPathContext context = JXPathContext.newContext(src); |
74 | 0 | result = context.getValue(expression); |
75 | } | |
76 | 6 | return result; |
77 | } | |
78 | 0 | catch (Exception e) |
79 | { | |
80 | 0 | throw new TransformerException(this, e); |
81 | } | |
82 | } | |
83 | ||
84 | /** | |
85 | * @return Returns the expression. | |
86 | */ | |
87 | public String getExpression() | |
88 | { | |
89 | 2 | return expression; |
90 | } | |
91 | ||
92 | /** | |
93 | * @param expression The expression to set. | |
94 | */ | |
95 | public void setExpression(String expression) | |
96 | { | |
97 | 6 | this.expression = expression; |
98 | 6 | } |
99 | ||
100 | /** | |
101 | * Should a single value be returned. | |
102 | * | |
103 | * @return value | |
104 | */ | |
105 | public boolean isSingleResult() | |
106 | { | |
107 | 0 | return singleResult; |
108 | } | |
109 | ||
110 | /** | |
111 | * If multiple results are expected from the {@link #expression} evaluation, set | |
112 | * this to false. | |
113 | * | |
114 | * @param singleResult flag | |
115 | */ | |
116 | public void setSingleResult(boolean singleResult) | |
117 | { | |
118 | 4 | this.singleResult = singleResult; |
119 | 4 | } |
120 | } |