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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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/**
 *
 */
package com.browseengine.bobo.search.section;

import java.io.IOException;

import org.apache.lucene.index.AtomicReader;
import org.apache.lucene.index.DocsAndPositionsEnum;
import org.apache.lucene.index.DocsEnum;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.DocIdSetIterator;

/**
 * An abstract class for terminal nodes of SectionSearchQueryPlan
 */
public abstract class AbstractTerminalNode extends SectionSearchQueryPlan {
  protected DocsAndPositionsEnum _dp;
  protected int _posLeft;
  protected int _curPos;

  public AbstractTerminalNode(Term term, AtomicReader reader) throws IOException {
    super();
    _dp = reader.termPositionsEnum(term);
    _posLeft = 0;
  }

  @Override
  public int fetchDoc(int targetDoc) throws IOException {
    if (targetDoc <= _curDoc) targetDoc = _curDoc + 1;

    if ((_curDoc = _dp.advance(targetDoc)) != DocsEnum.NO_MORE_DOCS) {
      _posLeft = _dp.freq();
      _curSec = -1;
      _curPos = -1;
      return _curDoc;
    } else {
      _curDoc = DocIdSetIterator.NO_MORE_DOCS;
      return _curDoc;
    }
  }

  @Override
  abstract public int fetchSec(int targetSec) throws IOException;
}