code: public void setMinTokenLength(int minTokenLength)
      {
          if(minTokenLength < 0)
              throw new IllegalArgumentException("Minimum token length must be non negative, not " + minTokenLength);
          if(minTokenLength > maxTokenLength)
              throw new IllegalArgumentException("Minimum token length can not exced the maximum token length");
          this.minTokenLength = minTokenLength;
      }
docs: Sets the minimum allowed token length. Any token discovered shorter than
  the minimum length will not be accepted and skipped over. The default
  is 0.
  @param minTokenLength the minimum length for a token to be used