1*795d594fSAndroid Build Coastguard Worker# Copyright (C) 2015 The Android Open Source Project 2*795d594fSAndroid Build Coastguard Worker# 3*795d594fSAndroid Build Coastguard Worker# Licensed under the Apache License, Version 2.0 (the "License"); 4*795d594fSAndroid Build Coastguard Worker# you may not use this file except in compliance with the License. 5*795d594fSAndroid Build Coastguard Worker# You may obtain a copy of the License at 6*795d594fSAndroid Build Coastguard Worker# 7*795d594fSAndroid Build Coastguard Worker# http://www.apache.org/licenses/LICENSE-2.0 8*795d594fSAndroid Build Coastguard Worker# 9*795d594fSAndroid Build Coastguard Worker# Unless required by applicable law or agreed to in writing, software 10*795d594fSAndroid Build Coastguard Worker# distributed under the License is distributed on an "AS IS" BASIS, 11*795d594fSAndroid Build Coastguard Worker# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*795d594fSAndroid Build Coastguard Worker# See the License for the specific language governing permissions and 13*795d594fSAndroid Build Coastguard Worker# limitations under the License. 14*795d594fSAndroid Build Coastguard Worker 15*795d594fSAndroid Build Coastguard Worker 16*795d594fSAndroid Build Coastguard Workerclass ImmutableDict(dict): 17*795d594fSAndroid Build Coastguard Worker def __setitem__(self, key, value): 18*795d594fSAndroid Build Coastguard Worker raise RuntimeError("Cannot modify ImmutableDict") 19*795d594fSAndroid Build Coastguard Worker 20*795d594fSAndroid Build Coastguard Worker def __delitem__(self, key): 21*795d594fSAndroid Build Coastguard Worker raise RuntimeError("Cannot modify ImmutableDict") 22*795d594fSAndroid Build Coastguard Worker 23*795d594fSAndroid Build Coastguard Worker def copy_with(self, key, value): 24*795d594fSAndroid Build Coastguard Worker new_dict = ImmutableDict(self) 25*795d594fSAndroid Build Coastguard Worker dict.__setitem__(new_dict, key, value) 26*795d594fSAndroid Build Coastguard Worker return new_dict 27