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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.util;

import java.io.IOException;

import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;

public class DocIdSetUtil {
  private DocIdSetUtil() {
  }

  public static String toString(DocIdSet docIdSet) throws IOException {
    DocIdSetIterator iter = docIdSet.iterator();
    StringBuffer buf = new StringBuffer();
    boolean firstTime = true;
    buf.append("[");
    int docid;
    while ((docid = iter.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
      if (firstTime) {
        firstTime = false;
      } else {
        buf.append(",");
      }
      buf.append(docid);
    }
    buf.append("]");
    return buf.toString();
  }
}