public void registerShield(int worldId,SiegeShield shield){
  List<SiegeShield> mapShields=registeredShields.get(worldId);
  if (mapShields == null) {
    mapShields=new ArrayList<SiegeShield>();
    registeredShields.put(worldId,mapShields);
  }
  mapShields.add(shield);
}

public void registerShield ( int worldId , SiegeShield shield ) { List < SiegeShield > mapShields = registeredShields . get ( worldId ) ; if ( mapShields == null ) { mapShields = new ArrayList < SiegeShield > ( ) ; registeredShields . put ( worldId , mapShields ) ; } mapShields . add ( shield ) ; }
registers geo shield for zone lookup
