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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.facets;

import java.util.LinkedList;
import java.util.List;

import com.browseengine.bobo.api.BrowseFacet;
import com.browseengine.bobo.api.FacetAccessible;
import com.browseengine.bobo.util.BigSegmentedArray;

/**
 *  Collects facet counts for a given browse request
 */
public interface FacetCountCollector extends FacetAccessible {
  /**
   * Collect a hit. This is called for every hit, thus the implementation needs to be super-optimized.
   * @param docid doc
   */
  void collect(int docid);

  /**
   * Collects all hits. This is called once per request by the facet engine in certain scenarios. 
   */
  void collectAll();

  /**
   * Gets the name of the facet
   * @return facet name
   */
  String getName();

  /**
   * Returns an integer array representing the distribution function of a given facet.
   * @return integer array of count values representing distribution of the facet values.
   */
  BigSegmentedArray getCountDistribution();

  /**
   * Empty facet list. 
   */
  public static List EMPTY_FACET_LIST = new LinkedList();

}