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


1 /* Copyright 2002-2004 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
25 import java.io.IOException JavaDoc;
26
27 import nu.xom.Builder;
28 import nu.xom.Document;
29 import nu.xom.Element;
30 import nu.xom.Node;
31 import nu.xom.ParsingException;
32
33
34 /**
35  *
36  * <p>
37  * Demonstrates recursive descent through a document
38  * using the <code>Node</code> class.
39  * </p>
40  *
41  * @author Elliotte Rusty Harold
42  * @version 1.0
43  *
44  */
45 public class NodeLister {
46
47     
48   public static void main(String JavaDoc[] args) {
49   
50     if (args.length == 0) {
51       System.out.println("Usage: java nu.xom.samples.NodeLister URL");
52       return;
53     }
54       
55     Builder builder = new Builder();
56      
57     try {
58       Document doc = builder.build(args[0]);
59       Element root = doc.getRootElement();
60       listChildren(root, 0);
61     }
62     // indicates a well-formedness error
63 catch (ParsingException ex) {
64       System.out.println(args[0] + " is not well-formed.");
65       System.out.println(ex.getMessage());
66     }
67     catch (IOException JavaDoc ex) {
68       System.out.println(ex);
69     }
70   
71   }
72   
73   
74   public static void listChildren(Node current, int depth) {
75    
76     printSpaces(depth);
77     String JavaDoc name = "";
78     if (current instanceof Element) {
79         Element temp = (Element) current;
80         name = ": " + temp.getQualifiedName();
81     }
82     System.out.println(current.getClass().getName() + name);
83     for (int i = 0; i < current.getChildCount(); i++) {
84       listChildren(current.getChild(i), depth+1);
85     }
86     
87   }
88   
89   
90   private static void printSpaces(int n) {
91     
92     for (int i = 0; i < n; i++) {
93       System.out.print(' ');
94     }
95     
96   }
97
98 }
99
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