src/plugin/tld/src/java/org/apache/nutch/scoring/tld/TLDScoringFilter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.nutch.scoring.tld;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.indexer.NutchField;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.scoring.AbstractScoringFilter;
import org.apache.nutch.scoring.ScoringFilterException;
import org.apache.nutch.util.domain.DomainSuffix;
import org.apache.nutch.util.domain.DomainSuffixes;

/**
 * Scoring filter to boost top-level domains (TLDs).
 */
public class TLDScoringFilter extends AbstractScoringFilter {

  private DomainSuffixes tldEntries;

  public TLDScoringFilter() {
    tldEntries = DomainSuffixes.getInstance();
  }

  @Override
  public float indexerScore(Text url, NutchDocument doc, CrawlDatum dbDatum,
      CrawlDatum fetchDatum, Parse parse, Inlinks inlinks, float initScore)
      throws ScoringFilterException {

    NutchField tlds = doc.getField("tld");
    float boost = 1.0f;

    if (tlds != null) {
      for (Object tld : tlds.getValues()) {
        DomainSuffix entry = tldEntries.get(tld.toString());
        if (entry != null)
          boost *= entry.getBoost();
      }
    }
    return initScore * boost;
  }

}