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# Copyright 2014-2015 MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Tools for specifying BSON codec options."""
from collections import MutableMapping, namedtuple
from bson.binary import (ALL_UUID_REPRESENTATIONS,
PYTHON_LEGACY,
UUID_REPRESENTATION_NAMES)
_options_base = namedtuple(
'CodecOptions', ('document_class', 'tz_aware', 'uuid_representation'))
class CodecOptions(_options_base):
"""Encapsulates BSON options used in CRUD operations.
:Parameters:
- `document_class`: BSON documents returned in queries will be decoded
to an instance of this class. Must be a subclass of
:class:`~collections.MutableMapping`. Defaults to :class:`dict`.
- `tz_aware`: If ``True``, BSON datetimes will be decoded to timezone
aware instances of :class:`~datetime.datetime`. Otherwise they will be
naive. Defaults to ``False``.
- `uuid_representation`: The BSON representation to use when encoding
and decoding instances of :class:`~uuid.UUID`. Defaults to
:data:`~bson.binary.PYTHON_LEGACY`.
"""
def __new__(cls, document_class=dict,
tz_aware=False, uuid_representation=PYTHON_LEGACY):
if not issubclass(document_class, MutableMapping):
raise TypeError("document_class must be dict, bson.son.SON, or "
"another subclass of collections.MutableMapping")
if not isinstance(tz_aware, bool):
raise TypeError("tz_aware must be True or False")
if uuid_representation not in ALL_UUID_REPRESENTATIONS:
raise ValueError("uuid_representation must be a value "
"from bson.binary.ALL_UUID_REPRESENTATIONS")
return tuple.__new__(
cls, (document_class, tz_aware, uuid_representation))
def __repr__(self):
document_class_repr = (
'dict' if self.document_class is dict
else repr(self.document_class))
uuid_rep_repr = UUID_REPRESENTATION_NAMES.get(self.uuid_representation,
self.uuid_representation)
return (
'CodecOptions(document_class=%s, tz_aware=%r, uuid_representation='
'%s)' % (document_class_repr, self.tz_aware, uuid_rep_repr))
DEFAULT_CODEC_OPTIONS = CodecOptions()
def _parse_codec_options(options):
"""Parse BSON codec options."""
return CodecOptions(
document_class=options.get(
'document_class', DEFAULT_CODEC_OPTIONS.document_class),
tz_aware=options.get(
'tz_aware', DEFAULT_CODEC_OPTIONS.tz_aware),
uuid_representation=options.get(
'uuidrepresentation', DEFAULT_CODEC_OPTIONS.uuid_representation))
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