code: public void setInputFile (final File value)
    {
      if (value != null && !value.isAbsolute ())
      {
        throw new IllegalArgumentException ("path is not absolute: " + value);
      }
      this.inputFile = value;
    }
docs: Sets the absolute path to the grammar file to pass into JTB for
  preprocessing.
  
  @param value
  The absolute path to the grammar file to pass into JTB for
  preprocessing.