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Java > Open Source Codes > org > archive > crawler > deciderules > PrerequisiteAcceptDecideRule


1 /* AcceptDecideRule
2 *
3 * $Id: PrerequisiteAcceptDecideRule.java,v 1.5.18.1 2007/01/13 01:31:15 stack-sf Exp $
4 *
5 * Created on Mar 3, 2005
6 *
7 * Copyright (C) 2005 Internet Archive.
8 *
9 * This file is part of the Heritrix web crawler (crawler.archive.org).
10 *
11 * Heritrix is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU Lesser Public License as published by
13 * the Free Software Foundation; either version 2.1 of the License, or
14 * any later version.
15 *
16 * Heritrix is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser Public License
22 * along with Heritrix; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25 package org.archive.crawler.deciderules;
26
27 import org.archive.crawler.datamodel.CandidateURI;
28 import org.archive.crawler.extractor.Link;
29
30
31 /**
32  * Rule which ACCEPTs all 'prerequisite' URIs (those with a 'P' in
33  * the last hopsPath position). Good in a late position to ensure
34  * other scope settings don't lock out necessary prerequisites.
35  *
36  * @author gojomo
37  */
38 public class PrerequisiteAcceptDecideRule extends AcceptDecideRule {
39
40     private static final long serialVersionUID = 2762042167111186142L;
41
42     public PrerequisiteAcceptDecideRule(String JavaDoc name) {
43         super(name);
44         setDescription("PrerequisiteAcceptDecideRule. ACCEPTs " +
45                 "all CrawlURIs discovered via a prerequisite " +
46                 "'link'.");
47     }
48
49     public Object JavaDoc decisionFor(Object JavaDoc object) {
50         try {
51             String JavaDoc hopsPath = ((CandidateURI)object).getPathFromSeed();
52             if (hopsPath != null && hopsPath.length() > 0 &&
53                     hopsPath.charAt(hopsPath.length()-1) == Link.PREREQ_HOP) {
54                 return ACCEPT;
55             }
56         } catch (ClassCastException JavaDoc e) {
57            // Do nothing
58 }
59         return PASS;
60     }
61 }
62
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