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


1 /* HasViaDecideRule
2 *
3 * $Id: HasViaDecideRule.java,v 1.1.4.1 2007/01/13 01:31:14 stack-sf Exp $
4 *
5 * Created on Aug 11, 2006
6 *
7 * Copyright (C) 2006 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
29
30
31 /**
32  * Rule applies the configured decision for any URI which has a 'via'
33  * (essentially, any URI that was a seed or some kinds of mid-crawl adds).
34  *
35  * @author gojomo
36  */
37 public class HasViaDecideRule extends PredicatedDecideRule {
38
39     private static final long serialVersionUID = 1670292311303097735L;
40
41     /**
42      * Usual constructor.
43      * @param name Name of this DecideRule.
44      */
45     public HasViaDecideRule(String JavaDoc name) {
46         super(name);
47         setDescription("HasViaDecideRule. Applies configured decision " +
48                 "to any URI that has a 'via'.");
49     }
50
51     /**
52      * Evaluate whether given object is over the threshold number of
53      * hops.
54      *
55      * @param object
56      * @return true if the mx-hops is exceeded
57      */
58     protected boolean evaluate(Object JavaDoc object) {
59         try {
60             CandidateURI curi = (CandidateURI)object;
61             return curi.getVia() != null;
62         } catch (ClassCastException JavaDoc e) {
63             // if not CrawlURI, always disregard
64 return false;
65         }
66     }
67 }
68
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