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This project contains some of the configurable modules used within the Heritrix application to crawl the web. The modules in this project can be used in applications other than Heritrix, however.

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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.modules.net;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.httpclient.URIException;
import org.archive.modules.CrawlURI;

/**
 * RobotsPolicy represents the strategy used by the crawler 
 * for determining how robots.txt files will be honored. 
 *
 * @author gojomo
 */
abstract public class RobotsPolicy {
    public static Map STANDARD_POLICIES = new HashMap();
    static {
        STANDARD_POLICIES.put("obey", ObeyRobotsPolicy.INSTANCE);
        // the obey policy has also historically been called 'classic'
        STANDARD_POLICIES.put("classic", ObeyRobotsPolicy.INSTANCE);
        STANDARD_POLICIES.put("ignore", IgnoreRobotsPolicy.INSTANCE); 
    }

    public abstract boolean allows(String userAgent, CrawlURI curi, Robotstxt robotstxt);
    
    public abstract boolean obeyMetaRobotsNofollow();
    
    public String getPathQuery(CrawlURI curi) {
        try {
            return curi.getUURI().getPathQuery();
        } catch (URIException e) {
            // unlikely
            return "";
        }
    }
}