# -*- coding: utf-8 -*-
"""
    Null object
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Simple implementation of the Null Object Pattern.
    Taken from "Implementing the Null Object Pattern" recipe from
    the Python CookBook.

    :url:     https://www.safaribooksonline.com/library/view/python-cookbook/0596001673/ch05s24.html
    :credit:  Dinu C. Gherman

    :copyright: Copyright (c) 2012-2015 Scott Bahling, SUSE Linux GmbH
    :license: GPL-2.0, see COPYING for details
"""


class Null:
    """ Null objects always and reliably "do nothing." """

    def __init__(self, *args, **kwargs):
        pass

    def __call__(self, *args, **kwargs):
        return self

    def __repr__(self):
        return "Null(  )"

    def __str__(self):
        return ""

    def __nonzero__(self):
        return 0

    def __getattr__(self, name):
        return self

    def __setattr__(self, name, value):
        return self

    def __delattr__(self, name):
        return self