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#
# -------------------------------------------------------------------------
# Copyright (c) 2015-2017 AT&T Intellectual Property
#
# 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 Helpers"""
from conductor.i18n import _LE # pylint: disable=W0212
def get_class(kls):
"""Returns a class given a fully qualified class name"""
parts = kls.split('.')
module = ".".join(parts[:-1])
mod = __import__(module)
for comp in parts[1:]:
mod = getattr(mod, comp)
return mod
class abstractclassmethod(classmethod): # pylint: disable=C0103,R0903
"""Abstract Class Method Decorator from Python 3.3's abc module"""
__isabstractmethod__ = True
def __init__(self, callable): # pylint: disable=W0622
callable.__isabstractmethod__ = True
super(abstractclassmethod, self).__init__(callable)
class ClassPropertyDescriptor(object): # pylint: disable=R0903
"""Supports the notion of a class property"""
def __init__(self, fget, fset=None):
"""Initializer"""
self.fget = fget
self.fset = fset
def __get__(self, obj, klass=None):
"""Get attribute"""
if klass is None:
klass = type(obj)
return self.fget.__get__(obj, klass)()
def __set__(self, obj, value):
"""Set attribute"""
if not self.fset:
raise AttributeError(_LE("Can't set attribute"))
type_ = type(obj)
return self.fset.__get__(obj, type_)(value)
def setter(self, func):
"""Setter"""
if not isinstance(func, (classmethod, staticmethod)):
func = classmethod(func)
self.fset = func
return self
def classproperty(func):
"""Class Property decorator"""
if not isinstance(func, (classmethod, staticmethod)):
func = classmethod(func)
return ClassPropertyDescriptor(func)
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