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


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 import nu.xom.Attribute;
25 import nu.xom.Document;
26 import nu.xom.Element;
27 import nu.xom.NodeFactory;
28 import nu.xom.Nodes;
29
30 /**
31  * <p>
32  * Demonstrates a custom <code>NodeFactory</code> that adds
33  * ID attributes to all elements that don't already have one.
34  * This is inspired by Example 8-12 in
35  * <cite>Processing XML with Java</cite>.
36  * In brief, it demonstrates that major modifications
37  * may have to take place in <code>endElement</code> but can still
38  * be effectively streamed.
39  * </p>
40  *
41  * @author Elliotte Rusty Harold
42  * @version 1.0
43  *
44  */
45 public class IDFilter extends NodeFactory {
46
47     private int counter = 0;
48     
49     public Document startMakingDocument() {
50         counter = 0;
51         return super.startMakingDocument();
52     }
53
54     public Nodes finishMakingElement(Element element) {
55         Attribute id = element.getAttribute("id");
56         if (id == null) {
57             id = new Attribute("id", "p" + counter);
58             element.addAttribute(id);
59         }
60         counter++;
61         return new Nodes(element);
62     }
63
64 }
65
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