1 /* HasViaDecideRule
2 *
3 * $Id: HasViaDecideRule.java 4649 2006-09-25 17:16:55Z paul_jack $
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 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 object) {
59 try {
60 CandidateURI curi = (CandidateURI)object;
61 return curi.getVia() != null;
62 } catch (ClassCastException e) {
63 // if not CrawlURI, always disregard
64 return false;
65 }
66 }
67 }