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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.docidset;

import java.io.IOException;

import org.apache.lucene.search.DocIdSet;

/**
 * Represents a sorted integer set
 */

public abstract class DocSet extends DocIdSet {
  /**
   * Add a doc id to the set
   * @param docid
   */
  public abstract void addDoc(int docid) throws IOException;

  /**
     * Add an array of sorted docIds to the set
     * @param docids
     * @param start
     * @param len
     */
  public void addDocs(int[] docids, int start, int len) throws IOException {
    int i = start;
    while (i < len) {
      addDoc(docids[i++]);
    }
  }

  /**
     * Return the set size
     * @return true if present, false otherwise
     */
  public boolean find(int target) throws IOException {
    return findWithIndex(target) > -1 ? true : false;
  }

  /**
     * Return the set size
     * @return index if present, -1 otherwise
     */
  public int findWithIndex(int target) throws IOException {
    return -1;
  }

  /**
     * Gets the number of ids in the set
     * @return size of the docset
     */
  public int size() throws IOException {
    return 0;
  }

  /**
   * Return the set size in bytes
   * @return index if present, -1 otherwise
   */
  public long sizeInBytes() throws IOException {
    return 0;
  }

  /**
   * Optimize by trimming underlying data structures
   */
  public void optimize() throws IOException {
    return;
  }

}