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


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 import java.io.IOException JavaDoc;
25
26 import nu.xom.Builder;
27 import nu.xom.Document;
28 import nu.xom.Element;
29 import nu.xom.Elements;
30 import nu.xom.Node;
31 import nu.xom.ParentNode;
32 import nu.xom.ParsingException;
33
34 /**
35  * <p>
36  * Demonstrates removing elements from a tree
37  * while retaining their children.
38  * </p>
39  *
40  * @author Elliotte Rusty Harold
41  * @version 1.0
42  *
43  */
44 public class RDDLStripper {
45
46     public final static String JavaDoc RDDL_NAMESPACE
47        = "http://www.rddl.org/";
48
49     public static void main(String JavaDoc[] args) {
50
51         if (args.length <= 0) {
52           System.out.println("Usage: java nu.xom.samples.RDDLStripper URL");
53           return;
54         }
55         
56         try {
57             Builder parser = new Builder();
58             Document doc = parser.build(args[0]);
59           
60             strip(doc.getRootElement());
61           
62
63             System.out.println(doc.toXML());
64         }
65         catch (ParsingException ex) {
66           System.out.println(args[0] + " is not well-formed.");
67           System.out.println(ex.getMessage());
68         }
69         catch (IOException JavaDoc ex) {
70           System.out.println(
71            "Due to an IOException, the parser could not read "
72            + args[0]
73           );
74         }
75         
76     }
77     
78     public static void strip(Element element) {
79         
80        if (element.getNamespaceURI().equals(RDDL_NAMESPACE)) {
81             
82             ParentNode parent = element.getParent();
83             int position = 0;
84             for (; position < parent.getChildCount(); position++) {
85                 if (parent.getChild(position) == element) break;
86             }
87             parent.removeChild(position);
88             while (element.getChildCount() > 0) {
89                 Node child = element.getChild(0);
90                 element.removeChild(0);
91                 parent.insertChild(child, position);
92                 position++;
93                 if (child instanceof Element) strip((Element) child);
94             }
95             
96         }
97         else {
98             Elements elements = element.getChildElements();
99             for (int i = 0; i < elements.size(); i++) {
100                 strip(elements.get(i));
101             }
102         }
103         
104     }
105     
106 }
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