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1
9
10 package org.dom4j.samples;
11
12 import java.io.BufferedReader  ;
13 import java.io.InputStreamReader ;
14 import java.util.Iterator ;
15 import java.util.List ;
16
17 import org.dom4j.Document;
18 import org.dom4j.Element;
19 import org.dom4j.Node;
20 import org.dom4j.io.OutputFormat;
21 import org.dom4j.io.XMLWriter;
22
23
30 public class XPathTool extends SAXDemo {
31
32 protected Document document;
33
34 protected XMLWriter xmlWriter;
35
36 protected boolean verbose;
37
38 public static void main(String [] args) {
39 run(new XPathTool(), args);
40 }
41
42 public XPathTool() {
43 }
44
45 public void run(String [] args) throws Exception {
46 if (args.length < 1) {
47 printUsage("{options} <xml file>");
48 return;
49 }
50
51 for (int i = 0, size = args.length; i < size; i++) {
52 String arg = args[i];
53 if (arg.startsWith("-")) {
54 readOptions(arg);
55 } else {
56 println("Parsing: " + arg);
57 document = parse(arg);
58 break;
59 }
60 }
61
62 xmlWriter = new XMLWriter(System.out, new OutputFormat(" ", true));
63 userLoop();
64 }
65
66 protected void userLoop() throws Exception {
67 println("Enter XPath expressions to evaluate or 'quit' to stop");
68
69 BufferedReader reader = new BufferedReader (new InputStreamReader (
70 System.in));
71
72 while (true) {
73 print("XPath> ");
74 String line = reader.readLine();
75 if (line == null) {
76 break;
77 }
78 line = line.trim();
79 if (line.equalsIgnoreCase("quit")) {
80 break;
81 }
82 evaluateCommand(line);
83 }
84
85 println("Bye");
86 }
87
88 protected void evaluateCommand(String xpath) throws Exception {
89 println("Results...");
90 Object results = document.selectObject(xpath);
91 printResult(results);
92 xmlWriter.flush();
93 }
94
95 protected void printResult(Object results) throws Exception {
96 if (results instanceof Node) {
97 Node node = (Node) results;
98 if (node instanceof Document) {
99 Document document = (Document) node;
100 println("Document: " + document.getName());
101 } else if (node instanceof Element) {
102 Element element = (Element) node;
103 xmlWriter.writeOpen(element);
104 xmlWriter.println();
105 } else {
106 xmlWriter.write(node);
107 xmlWriter.println();
108 }
109 } else if (results instanceof List ) {
110 List list = (List ) results;
111 println("List of " + list.size() + " item(s)");
112 for (Iterator iter = list.iterator(); iter.hasNext();) {
113 printResult(iter.next());
114 }
115 } else {
116 if (results == null) {
117 println("null");
118 } else {
119 println(results + " (" + results.getClass().getName() + ")");
120 }
121 }
122 }
123
124 protected void readOptions(String arg) {
125 if (arg.indexOf('v') >= 0) {
126 verbose = true;
127 }
128 }
129 }
130
131
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