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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.deciderules;

import java.util.regex.Pattern;

import org.archive.modules.CrawlURI;

/**
 * Rule applies configured decision to any CrawlURIs whose String URI
 * matches the supplied regex.
 *
 * @author gojomo
 */
public class MatchesRegexDecideRule extends PredicatedDecideRule {

    private static final long serialVersionUID = 2L;
    
    {
        setRegex(Pattern.compile("."));
    }
    public Pattern getRegex() {
        return (Pattern) kp.get("regex");
    }
    public void setRegex(Pattern regex) {
        kp.put("regex",regex); 
    }
    
    /**
     * Usual constructor. 
     */
    public MatchesRegexDecideRule() {
    }
    
    
    /**
     * Evaluate whether given object's string version
     * matches configured regex
     * 
     * @param uri
     * @return true if regex is matched
     */
    @Override
    protected boolean evaluate(CrawlURI uri) {
        Pattern p = getRegex();
        return p.matcher(getString(uri)).matches();
    }
    
    protected String getString(CrawlURI uri) {
        return uri.toString();
    }
}