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