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Java > Open Source Codes > nu > xom > samples > ElementLister


1 /* Copyright 2002, 2003 Elliotte Rusty Harold
2    
3    This library is free software; you can redistribute it and/or modify
4    it under the terms of version 2.1 of the GNU Lesser General Public
5    License as published by the Free Software Foundation.
6    
7    This library is distributed in the hope that it will be useful,
8    but WITHOUT ANY WARRANTY; without even the implied warranty of
9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10    GNU Lesser General Public License for more details.
11    
12    You should have received a copy of the GNU Lesser General Public
13    License along with this library; if not, write to the
14    Free Software Foundation, Inc., 59 Temple Place, Suite 330,
15    Boston, MA 02111-1307 USA
16    
17    You can contact Elliotte Rusty Harold by sending e-mail to
18    elharo@metalab.unc.edu. Please include the word "XOM" in the
19    subject line. The XOM home page is located at http://www.xom.nu/
20 */
21
22 package nu.xom.samples;
23
24 import java.io.IOException JavaDoc;
25
26 import nu.xom.Builder;
27 import nu.xom.Document;
28 import nu.xom.Element;
29 import nu.xom.Elements;
30 import nu.xom.ParsingException;
31
32
33 /**
34  * <p>
35  * Demonstrates walking the element hierarchy of
36  * an XML document.
37  * </p>
38  *
39  * @author Elliotte Rusty Harold
40  * @version 1.0
41  *
42  */
43 public class ElementLister {
44
45   public static void main(String JavaDoc[] args) {
46   
47     if (args.length == 0) {
48       System.out.println("Usage: java nu.xom.samples.ElementLister URL");
49       return;
50     }
51       
52     Builder builder = new Builder();
53      
54     try {
55       Document doc = builder.build(args[0]);
56       Element root = doc.getRootElement();
57       listChildren(root, 0);
58     }
59     // indicates a well-formedness error
60 catch (ParsingException ex) {
61       System.out.println(args[0] + " is not well-formed.");
62       System.out.println(ex.getMessage());
63     }
64     catch (IOException JavaDoc ex) {
65       System.out.println(ex);
66     }
67   
68   }
69   
70   
71   public static void listChildren(Element current, int depth) {
72    
73     printSpaces(depth);
74     System.out.println(current.getQualifiedName());
75     Elements children = current.getChildElements();
76     for (int i = 0; i < children.size(); i++) {
77       listChildren(children.get(i), depth+1);
78     }
79     
80   }
81   
82   private static void printSpaces(int n) {
83     
84     for (int i = 0; i < n; i++) {
85       System.out.print(' ');
86     }
87     
88   }
89
90 }
91
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