public static  void main(String[] args) throws Exception 
{
    IndexReader reader = null;
    boolean noFreqs = false;
    int count = 100;
    String usage = "HighFreqTerms [-count < n >] [-nofreqs] < index dir >";
    if (args.length == 0) {
      System.err.println(usage);
      System.exit(-1);
    }
    for (int i = 0; i <  args.length; i++) {       // parse command line
      if (args[i].equals("-count")) {		  // found -count option
        count = Integer.parseInt(args[++i]);
      } else if (args[i].equals("-nofreqs")) {    // found -nofreqs option
        noFreqs = true;
      } else {
        reader = IndexReader.open(args[i]);
      }
    }
    TermFreqQueue tiq = new TermFreqQueue(count);
    TermEnum terms = reader.terms();
    int minFreq = 0;
    while (terms.next()) {
      if (terms.docFreq()  > minFreq) {
        tiq.put(new TermFreq(terms.term(), terms.docFreq()));
        if (tiq.size()  >= count) {                 // if tiq overfull
          tiq.pop();                              // remove lowest in tiq
          minFreq = ((TermFreq)tiq.top()).docFreq; // reset minFreq
        }
      }
    }
    OutputStreamWriter out = new OutputStreamWriter(System.out, "UTF-8");
    while (tiq.size() != 0) {
      TermFreq termInfo = (TermFreq)tiq.pop();
      out.write(termInfo.term.toString());
      if (!noFreqs) {
        out.write(" ");
        out.write(Integer.toString(termInfo.docFreq));
      }
      out.write("\n");
    }
    out.flush();
    reader.close();
}