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

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/**
 * Iterator to iterate over facets
 */
package com.browseengine.bobo.api;

import java.util.Iterator;

/**
 * @author nnarkhed
 *
 */
public abstract class FacetIterator implements Iterator> {

  public int count;
  @SuppressWarnings("rawtypes")
  public Comparable facet;

  /**
   * Moves the iteration to the next facet
   * @return	 the next facet value
   */
  @Override
  public abstract Comparable next();

  /**
   * Moves the iteration to the next facet whose hitcount >= minHits. returns null if there is no facet whose hitcount >= minHits.
   * Hence while using this method, it is useless to use hasNext() with it.
   * After the next() method returns null, calling it repeatedly would result in undefined behavior
   * @return   The next facet value. It returns null if there is no facet whose hitcount >= minHits.
   */
  public abstract Comparable next(int minHits);

  public abstract String format(Object val);
}