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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.impl;

import java.util.List;
import java.util.NoSuchElementException;

import com.browseengine.bobo.api.BrowseFacet;
import com.browseengine.bobo.api.FacetIterator;

public class PathFacetIterator extends FacetIterator {

  private final BrowseFacet[] _facets;
  private int _index;

  /**
   * @param facets a value ascending sorted list of BrowseFacets
   */
  public PathFacetIterator(List facets) {
    _facets = facets.toArray(new BrowseFacet[facets.size()]);
    _index = -1;
    facet = null;
    count = 0;
  }

  /*
   * (non-Javadoc)
   * @see com.browseengine.bobo.api.FacetIterator#next()
   */
  @Override
  public Comparable next() {
    if ((_index >= 0) && !hasNext()) throw new NoSuchElementException(
        "No more facets in this iteration");
    _index++;
    facet = _facets[_index].getValue();
    count = _facets[_index].getFacetValueHitCount();
    return facet;
  }

  /*
   * (non-Javadoc)
   * @see java.util.Iterator#hasNext()
   */
  @Override
  public boolean hasNext() {
    return ((_index >= 0) && (_index < (_facets.length - 1)));
  }

  /*
   * (non-Javadoc)
   * @see java.util.Iterator#remove()
   */
  @Override
  public void remove() {
    throw new UnsupportedOperationException("remove() method not supported for Facet Iterators");
  }

  /*
   * (non-Javadoc)
   * @see com.browseengine.bobo.api.FacetIterator#next(int)
   */
  @Override
  public Comparable next(int minHits) {
    while (++_index < _facets.length) {
      if (_facets[_index].getFacetValueHitCount() >= minHits) {
        facet = _facets[_index].getValue();
        count = _facets[_index].getFacetValueHitCount();
        return facet;
      }
    }
    facet = null;
    count = 0;
    return facet;
  }

  /**
   * The string from here should be already formatted. No need to reformat.
   * @see com.browseengine.bobo.api.FacetIterator#format(java.lang.Object)
   */
  @Override
  public String format(Object val) {
    return (String) val;
  }
}