Source code for fastr.utils.classproperty

# Copyright 2011-2014 Biomedical Imaging Group Rotterdam, Departments of
# Medical Informatics and Radiology, Erasmus MC, Rotterdam, The Netherlands
#
# 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.

"""
Module containing the code to create class properties.
"""


[docs]class ClassPropertyDescriptor(object): """ A descriptor that can act like a property for a class. """
[docs] def __init__(self, fget): self.fget = fget
[docs] def __get__(self, obj, cls=None): if cls is None: cls = type(obj) return self.fget.__get__(obj, cls)()
[docs]def classproperty(func): """ Decorator to create a "class property" :param func: the function to wrap :return: a class property :rtype: ClassPropertyDescriptor """ if not isinstance(func, (classmethod, staticmethod)): func = classmethod(func) return ClassPropertyDescriptor(func)