49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
|
|
#
|
|
# 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.
|
|
# ==============================================================================
|
|
"""Immutable mapping."""
|
|
|
|
import collections.abc
|
|
|
|
|
|
# WARNING: this class is used internally by extension types (tf.ExtensionType),
|
|
# and may be deleted if/when extension types transition to a different encoding
|
|
# in the future.
|
|
class ImmutableDict(collections.abc.Mapping):
|
|
"""Immutable `Mapping`."""
|
|
# Note: keys, items, values, get, __eq__, and __ne__ are implemented by
|
|
# the `Mapping` base class.
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self._dict = dict(*args, **kwargs)
|
|
|
|
def __getitem__(self, key):
|
|
return self._dict[key]
|
|
|
|
def __contains__(self, key):
|
|
return key in self._dict
|
|
|
|
def __iter__(self):
|
|
return iter(self._dict)
|
|
|
|
def __len__(self):
|
|
return len(self._dict)
|
|
|
|
def __repr__(self):
|
|
return f'ImmutableDict({self._dict})'
|
|
|
|
# This supresses a warning that tf.nest woud otherwise generate.
|
|
__supported_by_tf_nest__ = True
|
|
|