code: public void setEncoding( String encoding )
      {
          if ( NATIVE_ENCODING.equals( encoding ) )
          {
              encoding = null;
          }
          this.encoding = encoding;
      }
docs: Sets the encoding to assume for file names and comments.
  <p/>
  <p>
  Set to <code>native-encoding</code> if you want your platform's native encoding, defaults to UTF8.
  </p>