AnchorIndexingFilter.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.anchor;

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;

/**
 * Indexing filter that indexes all inbound anchor text for a document. 
 */
public class AnchorIndexingFilter
  implements IndexingFilter {

  public static final Log LOG = LogFactory.getLog(AnchorIndexingFilter.class);
  private Configuration conf;

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

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

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

    String[] anchors = (inlinks != null ? inlinks.getAnchors()
      : new String[0]);
    for (int i = 0; i < anchors.length; i++) {
      doc.add("anchor", anchors[i]);
    }

    return doc;
  }

  public void addIndexBackendOptions(Configuration conf) {
    LuceneWriter.addFieldOptions("anchor", LuceneWriter.STORE.NO,
        LuceneWriter.INDEX.TOKENIZED, conf);
  }

}