+ self._process_refresh(addressbook, added, removed, changed)
+
+ def _is_on_list(self, number):
+ return True
+
+ def _is_on_list_changed(self, number):
+ return (number in self.__members) ^ (self._is_on_list(number))
+
+ def _is_now_on_list(self, number):
+ return number not in self.__members and self._is_on_list(number)