private IgfsMode parseIgfsMode(String[] ss,int ix){
  if (ss.length <= ix)   return null;
 else {
    String s=ss[ix];
    return s.isEmpty() ? null : IgfsMode.valueOf(s);
  }
}

private IgfsMode parseIgfsMode ( String [ ] ss , int ix ) { if ( ss . length <= ix ) return null ; else { String s = ss [ ix ] ; return s . isEmpty ( ) ? null : IgfsMode . valueOf ( s ) ; } }
parse igfs mode from string .
