def __init__(self, pilot_data_service=None, pilot_data_description=None, pd_url=None):
"""
1.) create a new Pilot Data: pilot_data_service and pilot_data_description required
2.) reconnect to an existing Pilot Data: pd_url required
"""
if pd_url==None:
self.id = self.PD_ID_PREFIX + str(uuid.uuid1())
self.pilot_data_description = pilot_data_description
self.pilot_stores=[]
self.url = CoordinationAdaptor.add_pd(pilot_data_service.url, self)
self.state = State.New
self.data_units = DataUnit.create_data_unit_list(self, self.pilot_data_description["file_urls"])
CoordinationAdaptor.update_pd(self)
else:
self.id = self.__get_pd_id(pd_url)
self.url = pd_url
self.__restore_state()
