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


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.Attribute;
27 import nu.xom.Builder;
28 import nu.xom.Element;
29 import nu.xom.NodeFactory;
30 import nu.xom.Nodes;
31 import nu.xom.ParsingException;
32
33 /**
34  * <p>
35  * Demonstrates using the <code>Builder</code> and a custom
36  * <code>NodeFactory</code> to list the comments in a document
37  * that contains very little else, thus saving
38  * memory, and avoiding the overhead of building
39  * lots of objects we don't actually need.
40  * </p>
41  *
42  * @author Elliotte Rusty Harold
43  * @version 1.0
44  *
45  */
46 public class StreamingCommentReader extends NodeFactory {
47
48     private Nodes empty = new Nodes();
49
50     // We don't really need the comments. We just want to print them.
51 public Nodes makeComment(String JavaDoc data) {
52         System.out.println(data);
53         return empty;
54     }
55
56     // We don't need text nodes at all
57 public Nodes makeText(String JavaDoc data) {
58         return empty;
59     }
60
61     public Element makeRootElement(String JavaDoc name, String JavaDoc namespace) {
62         return new Element(name, namespace);
63     }
64     
65     public Element startMakingElement(String JavaDoc name, String JavaDoc namespace) {
66         return null;
67     }
68
69     public Nodes makeAttribute(String JavaDoc name, String JavaDoc URI,
70       String JavaDoc value, Attribute.Type type) {
71         return empty;
72     }
73
74     public Nodes makeDocType(String JavaDoc rootElementName,
75       String JavaDoc publicID, String JavaDoc systemID) {
76         return empty;
77     }
78
79     public Nodes makeProcessingInstruction(
80       String JavaDoc target, String JavaDoc data) {
81         return empty;
82     }
83
84     public static void main(String JavaDoc[] args) {
85   
86         if (args.length <= 0) {
87           System.out.println("Usage: java nu.xom.samples.CommentReader URL");
88           return;
89         }
90         
91         try {
92           Builder parser = new Builder(new StreamingCommentReader());
93           parser.build(args[0]);
94         }
95         catch (ParsingException ex) {
96           System.out.println(args[0] + " is not well-formed.");
97           System.out.println(ex.getMessage());
98         }
99         catch (IOException JavaDoc ex) {
100           System.out.println(
101            "Due to an IOException, the parser could not read "
102            + args[0]
103           );
104         }
105   
106     }
107
108 }
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