class Updater(object):
"""Updates the shadow database and allows hand-correction of image ID
synchronization."""
reader = None
"""reader instance"""
shadow = None
"""persistence instance"""
# String -> Updater
def __init__(self, kpadir, shadow_path):
"""Takes the location of the KPA root directory and a relative path to
the shadow DB."""
db_path = os.path.abspath(os.path.join(kpadir, shadow_path))
self.shadow = Shadow(db_path)
self.reader = Reader(kpadir)
# -> Boolean
def update(self, force=False):
"""Update database and resolve any created, deleted, moved, or edited
files. Does not update if index file has not changed and force=False
(default). Returns boolean indicating whether an update was performed."""
new_checksum = self.reader.get_checksum() # will need either way
if force:
need_update = True
else:
old_checksum = self.shadow.get_checksum()
need_update = old_checksum != new_checksum
if not need_update:
return False
data = self.reader.read_latest_data() # imageID:None
self.shadow.apply_latest_data(data, new_checksum)
return True
