public IndexBuilder addColumns(boolean ascending,String... names){
  if (names != null) {
    for (    String name : names) {
      _columns.add(new Column(name,ascending));
    }
  }
  return this;
}

public IndexBuilder addColumns ( boolean ascending , String ... names ) { if ( names != null ) { for ( String name : names ) { _columns . add ( new Column ( name , ascending ) ) ; } } return this ; }
adds the columns with the given ordering to the index .
