contenttypematchesregexpdeciderule.java

这是个爬虫和lucece相结合最好了

/* $Id:  $
 *
 * Copyright (C) 2007 Olaf Freyer
 *
 * This file is part of the Heritrix web crawler (crawler.archive.org).
 *
 * Heritrix is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * any later version.
 *
 * Heritrix is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser Public License
 * along with Heritrix; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.archive.crawler.deciderules;

import org.archive.crawler.datamodel.CrawlURI;
import org.archive.util.TextUtils;

/**
 * DecideRule whose decision is applied if the URI's content-type 
 * is present and matches the supplied regular expression. 
 * 
 * @author Olaf Freyer
 */
public class ContentTypeMatchesRegExpDecideRule extends MatchesRegExpDecideRule{
    private static final long serialVersionUID = -2066930281015155843L;

    public ContentTypeMatchesRegExpDecideRule(String name) {
        super(name);
        setDescription("ContentTypeMatchesRegExpDecideRule. Applies the " +
            "configured decision to URIs matching the supplied regular " +
            "expression. Cannot be used until after fetcher processors. " +
            "Only then is the Content-Type known. A good place for this " +
            "rule is at the writer step processing.  If the content-type " +
            "is null, 301s usually have no content-type, this deciderule " +
            "will PASS.");
    }
    
    @Override
    protected boolean evaluate(Object o) {
            if (!(o instanceof CrawlURI)) {
                return false;
            }
            String content_type = ((CrawlURI)o).getContentType();
            String regexp = getRegexp(o);
            return (regexp == null || content_type == null)? false:
                    TextUtils.matches(getRegexp(o), content_type);
        }
}