code: @SuppressWarnings("unchecked")
      @Override
  	public <T extends ApiRoom> List<T> getRoomsInGroup(String groupId) {
  	    List<Room> sfsRooms = getZone().getRoomListFromGroup(groupId);
  	    List<T> answer = new ArrayList<>();
  	    for(Room sfsRoom : sfsRooms) {
  	        if(sfsRoom.containsProperty(APIKey.ROOM))
  	            answer.add((T) sfsRoom.getProperty(APIKey.ROOM));
  	    }
  	    return answer;
  	}
docs: /* (non-Javadoc)
  @see com.tvd12.ezyfox.core.entities.ApiZone#getRoomsInGroup(java.lang.String)