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


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
25 import java.io.IOException JavaDoc;
26
27 import nu.xom.Attribute;
28 import nu.xom.Builder;
29 import nu.xom.Document;
30 import nu.xom.Element;
31 import nu.xom.Elements;
32 import nu.xom.ParsingException;
33
34
35 /**
36  *
37  * <p>
38  * Demonstrates recursive descent through a document,
39  * and reading and setting of attributes on elements.
40  * </p>
41  *
42  * @author Elliotte Rusty Harold
43  * @version 1.0
44  *
45  */
46 public class IDTagger {
47
48   private static int id = 1;
49
50   public static void processElement(Element element) {
51     
52     if (element.getAttribute("ID") == null) {
53       element.addAttribute(new Attribute("ID", "_" + id));
54       id = id + 1;
55     }
56     
57     // recursion
58 Elements children = element.getChildElements();
59     for (int i = 0; i < children.size(); i++) {
60       processElement(children.get(i));
61     }
62     
63   }
64
65   public static void main(String JavaDoc[] args) {
66      
67     Builder builder = new Builder();
68     
69     for (int i = 0; i < args.length; i++) {
70         
71       try {
72         // Read the entire document into memory
73 Document document = builder.build(args[i]);
74        
75         processElement(document.getRootElement());
76         
77         System.out.println(document.toXML());
78       }
79       catch (ParsingException ex) {
80         System.err.println(ex);
81         continue;
82       }
83       catch (IOException JavaDoc ex) {
84         System.err.println(ex);
85         continue;
86       }
87       
88     }
89   
90   } // end main
91
92 }
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