def update(self, buddy_sns=[]):
''' The general 'update' logic for a plotter. Subclasses override
draw() in order to provide unique behavior.
@param buddy_sns A list of strings representing buddy screen names.
'''
self.current_buddy_sn_list = buddy_sns
# TODO: decide how we feel about the view looking stuff up in the db
ble_entries = BuddyLogEntry.get_cumu_logs_for_set(buddy_sns)
self.figure.clear()
self.figure.gca().clear()
if len(buddy_sns) == 0: buddy_sns = ['representative sample']
self.draw(buddy_sns=buddy_sns, ble_entries=ble_entries)
