def build(cls, now=None, middle=None, long_ago=None, get_earliest=False):
"""
Create TimeGhost objects from triplets of events.
"""
timeghost = TimeGhost(now=now, middle=middle, long_ago=long_ago)
# Set the .now Event to "now" if not specified:
if timeghost.now is None:
timeghost.set(Event.now(), "now")
# Generate a .middle Event if not specified:
if timeghost.middle is None:
timeghost.set(Event.get_random(), "middle")
# Generate a .long_ago Event if not specified:
if timeghost.long_ago is None:
try:
long_ago = timeghost.find_best_long_ago(get_earliest)
except TimeGhostError:
long_ago = Event.get_earliest()
timeghost.set(long_ago, "long_ago")
# Return a new instance to insure the init validation is run properlhy:
return TimeGhost(timeghost.now, timeghost.middle, timeghost.long_ago)
def build_from_timeghost(cls, timeghost):
"""Return a completed TimeGhost based on the partial TimeGhost
request."""
logging.debug("TimeGhostFactory.build: %s", timeghost)
# Timeghost between now and a random event
if timeghost.middle is None:
timeghost.middle = Event.get_random()
# Timeghost for now and given middle, no long_ago
elif timeghost.now is not None and \
timeghost.middle is not None and \
timeghost.long_ago is None:
pass
# Fully specified timeghost. Just return it.
elif timeghost.now is not None and \
timeghost.middle is not None and \
timeghost.long_ago is not None:
return timeghost
# Otherwise error
else:
raise TimeGhostError("bad case in TimeGhostFactory.build for %s",
timeghost)
logging.debug("TimeGhostFactory.build: %s", timeghost)
try:
best_long_ago = timeghost.find_best_long_ago()
except TimeGhostError:
best_long_ago = Event.get_earliest()
logging.debug("TimeGhostFactory.build: %s", best_long_ago)
output_timeghost = TimeGhost(now=timeghost.now,
middle=timeghost.middle,
long_ago=best_long_ago)
logging.debug("TimeGhostFactory.build: %s", output_timeghost)
return output_timeghost
