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# Copyright (c) 2017-present, Facebook, 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.
##############################################################################
"""A simple attribute dictionary used for representing configuration options."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
class AttrDict(dict):
IMMUTABLE = '__immutable__'
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.__dict__[AttrDict.IMMUTABLE] = False
def __getattr__(self, name):
if name in self.__dict__:
return self.__dict__[name]
elif name in self:
return self[name]
else:
raise AttributeError(name)
def __setattr__(self, name, value):
if not self.__dict__[AttrDict.IMMUTABLE]:
if name in self.__dict__:
self.__dict__[name] = value
else:
self[name] = value
else:
raise AttributeError(
'Attempted to set "{}" to "{}", but AttrDict is immutable'.format(name, value)
)
def immutable(self, is_immutable):
"""Set immutability to is_immutable and recursively apply the setting
to all nested AttrDicts.
"""
self.__dict__[AttrDict.IMMUTABLE] = is_immutable
# Recursively set immutable state
for v in self.__dict__.values():
if isinstance(v, AttrDict):
v.immutable(is_immutable)
for v in self.values():
if isinstance(v, AttrDict):
v.immutable(is_immutable)
def is_immutable(self):
return self.__dict__[AttrDict.IMMUTABLE]
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