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


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 java.io.IOException JavaDoc;
25
26 import nu.xom.Builder;
27 import nu.xom.Element;
28 import nu.xom.Nodes;
29 import nu.xom.ParsingException;
30
31 /**
32  * <p>
33  * Print just the headlines from an RSS feed
34  * </p>
35  *
36  * @author Elliotte Rusty Harold
37  * @version 1.0
38  */
39 public class RSSHeadlines extends MinimalNodeFactory {
40
41     private boolean inTitle = false;
42     private Nodes empty = new Nodes();
43
44     public Element startMakingElement(String JavaDoc name, String JavaDoc namespace) {
45         if ("title".equals(name) ) {
46             inTitle = true;
47         }
48         return new Element(name, namespace);
49     }
50
51     public Nodes makeText(String JavaDoc data) {
52         if (inTitle) System.out.print(data);
53         return empty;
54     }
55
56     public Nodes finishMakingElement(Element element) {
57         if ("title".equals(element.getQualifiedName()) ) {
58             System.out.println();
59             inTitle = false;
60         }
61         return new Nodes(element);
62     }
63
64     public static void main(String JavaDoc[] args) {
65   
66         String JavaDoc url = "http://www.bbc.co.uk/syndication/feeds/news/ukfs_news/world/rss091.xml";
67         if (args.length > 0) {
68           url = args[0];
69         }
70         
71         try {
72           Builder parser = new Builder(new RSSHeadlines());
73           parser.build(url);
74         }
75         catch (ParsingException ex) {
76           System.out.println(url + " is not well-formed.");
77           System.out.println(ex.getMessage());
78         }
79         catch (IOException JavaDoc ex) {
80           System.out.println(
81            "Due to an IOException, the parser could not read " + url
82           );
83         }
84   
85     }
86
87 }
88
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