1# Copyright (C) 2015 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#   http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15class ImmutableDict(dict):
16  def __setitem__(self, key, value):
17    raise RuntimeError("Cannot modify ImmutableDict")
18
19  def __delitem__(self, key):
20    raise RuntimeError("Cannot modify ImmutableDict")
21
22  def copyWith(self, key, value):
23    newDict = ImmutableDict(self)
24    dict.__setitem__(newDict, key, value)
25    return newDict
26