def get_time_not_schedulable(self, start, end, blackouts=True):
"""
What is the set of time ([(start, end)]) in the given time window
where this session is not schedulable?
Here we consolidate all events so that we can use them to make
calculations of the percentage of time available.
"""
# WTF?
if self.project is None:
return []
dts = set([])
dts = dts.union(self.get_receiver_blackout_ranges(start, end))
dts = dts.union(self.project.get_prescheduled_times(start, end))
if blackouts:
dts = dts.union(self.project.get_blackout_times(start, end))
# the call to unions won't accept the None used
# sometimes by get_receiver_blackout_range, so substitue in
# the given boundries for these
newDts = []
for (s, e) in list(dts):
if s is None:
s = start
if e is None:
e = end
newDts.append((s, e))
return sorted(AnalogSet.unions(newDts))
