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Java > Open Source Codes > net > nutch > parse > HtmlParseFilters


1 /* Copyright (c) 2003 The Nutch Organization. All rights reserved. */
2 /* Use subject to the conditions in http://www.nutch.org/LICENSE.txt. */
3
4 package net.nutch.parse;
5
6 import net.nutch.protocol.Content;
7 import net.nutch.plugin.*;
8
9 import org.w3c.dom.DocumentFragment JavaDoc;
10
11 /** Creates and caches {@link HtmlParseFilter} implementing plugins.*/
12 public class HtmlParseFilters {
13
14   private static final HtmlParseFilter[] CACHE;
15   static {
16     try {
17       ExtensionPoint point = PluginRepository.getInstance()
18         .getExtensionPoint(HtmlParseFilter.X_POINT_ID);
19       if (point == null)
20         throw new RuntimeException JavaDoc(HtmlParseFilter.X_POINT_ID+" not found.");
21       Extension[] extensions = point.getExtentens();
22       CACHE = new HtmlParseFilter[extensions.length];
23       for (int i = 0; i < extensions.length; i++) {
24         Extension extension = extensions[i];
25         CACHE[i] = (HtmlParseFilter)extension.getExtensionInstance();
26       }
27     } catch (PluginRuntimeException e) {
28       throw new RuntimeException JavaDoc(e);
29     }
30   }
31
32   private HtmlParseFilters() {} // no public ctor
33
34   /** Run all defined filters. */
35   public static Parse filter(Content content,Parse parse,DocumentFragment JavaDoc doc)
36     throws ParseException {
37
38     for (int i = 0 ; i < CACHE.length; i++) {
39       parse = CACHE[i].filter(content, parse, doc);
40     }
41
42     return parse;
43   }
44 }
45
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