public LengthFilter(TokenStream in,
    int min,
    int max) 
{
    super(in);
    this.min = min;
    this.max = max;
}

Build a filter that removes words that are too long or too short from the text.

 public final Token next(Token result) throws IOException 
{
    // return the first non-stop word found
    for (Token token = input.next(result); token != null; token = input.next(result))
    {
      int len = token.termLength();
      if (len  >= min && len < = max) {
          return token;
      }
      // note: else we ignore it but should we index each part of it?
    }
    // reached EOS -- return null
    return null;
}

Returns the next input Token whose termText() is the right len