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setter.py
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46 lines (38 loc) · 1.51 KB
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# Copyright 2008-2015 Nokia Networks
# Copyright 2016- Robot Framework Foundation
#
# 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.
class setter:
def __init__(self, method):
self.method = method
self.attr_name = '_setter__' + method.__name__
self.__doc__ = method.__doc__
def __get__(self, instance, owner):
if instance is None:
return self
try:
return getattr(instance, self.attr_name)
except AttributeError:
raise AttributeError(self.method.__name__)
def __set__(self, instance, value):
if instance is None:
return
setattr(instance, self.attr_name, self.method(instance, value))
class SetterAwareType(type):
def __new__(cls, name, bases, dct):
slots = dct.get('__slots__')
if slots is not None:
for item in dct.values():
if isinstance(item, setter):
slots.append(item.attr_name)
return type.__new__(cls, name, bases, dct)