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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 org.archive.modules.CrawlURI;

/**
 * Rule which applies the configured decision only if a 
 * test evaluates to true. Subclasses override evaluate()
 * to establish the test. 
 *
 * @author gojomo
 */
public abstract class PredicatedDecideRule extends DecideRule {
    private static final long serialVersionUID = 1L;

    {
        setDecision(DecideResult.ACCEPT);
    }
    public DecideResult getDecision() {
        return (DecideResult) kp.get("decision");
    }
    public void setDecision(DecideResult decision) {
        kp.put("decision",decision);
    }
    
    public PredicatedDecideRule() {
    }

    @Override
    protected DecideResult innerDecide(CrawlURI uri) {
        if (evaluate(uri)) {
            return getDecision();
        }
        return DecideResult.NONE;
    }

    @Override
    public DecideResult onlyDecision(CrawlURI uri) {
        return getDecision();
    }

    protected abstract boolean evaluate(CrawlURI object);
}