private Vector get_hierarchy ( ) { synchronized ( this ) { final Vector h = new Vector ( ) ; final Iterator it = elements . iterator ( ) ; while ( it . hasNext ( ) ) { final GroupElement e = ( GroupElement ) it . next ( ) ; if ( e instanceof GroupDeviceElement ) { h . add ( e ) ; } else { h . add ( ( ( Group ) e ) . get_hierarchy ( ) ) ; } } return h ; } }
Returns the group s hierarchy