TLDIndexingFilter.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.indexer.tld;

import java.net.URL;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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.IndexingException;
import org.apache.nutch.indexer.IndexingFilter;
import org.apache.nutch.indexer.NutchDocument;
import org.apache.nutch.indexer.lucene.LuceneWriter;
import org.apache.nutch.parse.Parse;
import org.apache.nutch.util.URLUtil;
import org.apache.nutch.util.domain.DomainSuffix;

/**
 * Adds the Top level domain extensions to the index
 * @author Enis Soztutar <enis.soz.nutch@gmail.com>
 */
public class TLDIndexingFilter implements IndexingFilter {
  public static final Log LOG = LogFactory.getLog(TLDIndexingFilter.class);

  private Configuration conf;

  public NutchDocument filter(NutchDocument doc, Parse parse, Text urlText, CrawlDatum datum, Inlinks inlinks)
  throws IndexingException {

    try {
      URL url = new URL(urlText.toString());
      DomainSuffix d = URLUtil.getDomainSuffix(url);
      
      doc.add("tld", d.getDomain());
      
    }catch (Exception ex) {
      LOG.warn(ex);
    }

    return doc;
  }

  public void setConf(Configuration conf) {
    this.conf = conf;
  }

  public Configuration getConf() {
    return this.conf;
  }

  public void addIndexBackendOptions(Configuration conf) {
    // store, no index
    LuceneWriter.addFieldOptions("tld", LuceneWriter.STORE.YES,
                                 LuceneWriter.INDEX.NO, conf);
  }
}