View Javadoc

    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  }