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1
7
8 package org.dom4j.xpath;
9
10 import java.util.ArrayList  ;
11
12 import org.dom4j.InvalidXPathException;
13 import org.dom4j.Node;
14 import org.dom4j.XPathException;
15
16 import org.jaxen.Context;
17 import org.jaxen.ContextSupport;
18 import org.jaxen.JaxenException;
19 import org.jaxen.SimpleNamespaceContext;
20 import org.jaxen.SimpleVariableContext;
21 import org.jaxen.VariableContext;
22 import org.jaxen.XPathFunctionContext;
23 import org.jaxen.dom4j.DocumentNavigator;
24 import org.jaxen.pattern.Pattern;
25 import org.jaxen.pattern.PatternParser;
26 import org.jaxen.saxpath.SAXPathException;
27
28
37 public class XPathPattern implements org.dom4j.rule.Pattern {
38 private String text;
39
40 private Pattern pattern;
41
42 private Context context;
43
44 public XPathPattern(Pattern pattern) {
45 this.pattern = pattern;
46 this.text = pattern.getText();
47 this.context = new Context(getContextSupport());
48 }
49
50 public XPathPattern(String text) {
51 this.text = text;
52 this.context = new Context(getContextSupport());
53
54 try {
55 this.pattern = PatternParser.parse(text);
56 } catch (SAXPathException e) {
57 throw new InvalidXPathException(text, e.getMessage());
58 } catch (Throwable t) {
59 throw new InvalidXPathException(text, t);
60 }
61 }
62
63 public boolean matches(Node node) {
64 try {
65 ArrayList list = new ArrayList (1);
66 list.add(node);
67 context.setNodeSet(list);
68
69 return pattern.matches(node, context);
70 } catch (JaxenException e) {
71 handleJaxenException(e);
72
73 return false;
74 }
75 }
76
77 public String getText() {
78 return text;
79 }
80
81 public double getPriority() {
82 return pattern.getPriority();
83 }
84
85 public org.dom4j.rule.Pattern[] getUnionPatterns() {
86 Pattern[] patterns = pattern.getUnionPatterns();
87
88 if (patterns != null) {
89 int size = patterns.length;
90 XPathPattern[] answer = new XPathPattern[size];
91
92 for (int i = 0; i < size; i++) {
93 answer[i] = new XPathPattern(patterns[i]);
94 }
95
96 return answer;
97 }
98
99 return null;
100 }
101
102 public short getMatchType() {
103 return pattern.getMatchType();
104 }
105
106 public String getMatchesNodeName() {
107 return pattern.getMatchesNodeName();
108 }
109
110 public void setVariableContext(VariableContext variableContext) {
111 context.getContextSupport().setVariableContext(variableContext);
112 }
113
114 public String toString() {
115 return "[XPathPattern: text: " + text + " Pattern: " + pattern + "]";
116 }
117
118 protected ContextSupport getContextSupport() {
119 return new ContextSupport(new SimpleNamespaceContext(),
120 XPathFunctionContext.getInstance(),
121 new SimpleVariableContext(), DocumentNavigator.getInstance());
122 }
123
124 protected void handleJaxenException(JaxenException exception)
125 throws XPathException {
126 throw new XPathException(text, exception);
127 }
128 }
129
130
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