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# Copyright 2015-2016 Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import obnamlib
class Bag(object):
def __init__(self):
self._bag_id = None
self._blobs = []
self._blobs_bytes = 0
def get_id(self):
return self._bag_id
def set_id(self, bag_id):
assert isinstance(bag_id, (int, long, str))
self._bag_id = bag_id
def append(self, blob):
if self.get_id() is None:
raise BagIdNotSetError()
self._blobs.append(blob)
self._blobs_bytes += len(blob)
return obnamlib.make_object_id(self.get_id(), len(self) - 1)
def __len__(self):
return len(self._blobs)
def get_bytes(self):
return self._blobs_bytes
def __getitem__(self, index):
return self._blobs[index]
class BagIdNotSetError(obnamlib.ObnamError):
msg = 'Bag id not set: cannot append a blob (programming error)'
def make_object_id(bag_id, object_index):
if isinstance(bag_id, str):
assert object_index == 0
return '%s.%d' % (bag_id, object_index)
return '%016x.%d' % (bag_id, object_index)
def parse_object_id(object_id):
parts = object_id.split('.', 1)
return int(parts[0], 16), int(parts[1])
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