org.archive.crawler.frontier.AntiCalendarCostAssignmentPolicy Maven / Gradle / Ivy
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/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.archive.crawler.frontier;
import java.util.regex.Matcher;
import org.archive.modules.CrawlURI;
import org.archive.util.TextUtils;
/**
* CostAssignmentPolicy that further penalizes URIs with
* calendar-suggestive strings in them, with an extra unit
* of cost.
*
* Will catch some 'innocent' URIs, but only when uncaught
* large-volume chaff is ranked higher than caught 'wheat'
* will this cause notable problems.
*
* @author gojomo
*/
public class AntiCalendarCostAssignmentPolicy extends UnitCostAssignmentPolicy {
private static final long serialVersionUID = 3L;
public static String CALENDARISH =
"(?i)(calendar)|(year)|(month)|(day)|(date)|(viewcal)" +
"|(\\D19\\d\\d\\D)|(\\D20\\d\\d\\D)|(event)|(yr=)" +
"|(calendrier)|(jour)";
/* (non-Javadoc)
* @see org.archive.crawler.frontier.CostAssignmentPolicy#costOf(org.archive.crawler.datamodel.CrawlURI)
*/
public int costOf(CrawlURI curi) {
int cost = super.costOf(curi);
Matcher m = TextUtils.getMatcher(CALENDARISH, curi.toString());
if (m.find()) {
cost++;
// TODO: consider if multiple occurrences should cost more
}
TextUtils.recycleMatcher(m);
return cost;
}
}