mirror of
https://github.com/clinton-hall/nzbToMedia.git
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6bb4ae56bd
Dependencies: * backports.functools-lru-cache 1.2.1 * jaraco.classes 1.3 * jaraco.collections 1.3.2 * jaraco.functools 1.11 * jaraco.structures 1.0 * jaraco.text 1.7 * jaraco.ui 1.4 * jaraco.windows 3.6 * more-itertools 2.2 * path.py 8.2.1 * six 1.10.0
40 lines
942 B
Python
40 lines
942 B
Python
"""
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meta.py
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Some useful metaclasses.
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"""
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from __future__ import unicode_literals
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class LeafClassesMeta(type):
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"""
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A metaclass for classes that keeps track of all of them that
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aren't base classes.
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"""
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_leaf_classes = set()
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def __init__(cls, name, bases, attrs):
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if not hasattr(cls, '_leaf_classes'):
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cls._leaf_classes = set()
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leaf_classes = getattr(cls, '_leaf_classes')
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leaf_classes.add(cls)
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# remove any base classes
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leaf_classes -= set(bases)
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class TagRegistered(type):
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"""
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As classes of this metaclass are created, they keep a registry in the
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base class of all classes by a class attribute, indicated by attr_name.
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"""
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attr_name = 'tag'
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def __init__(cls, name, bases, namespace):
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super(TagRegistered, cls).__init__(name, bases, namespace)
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if not hasattr(cls, '_registry'):
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cls._registry = {}
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meta = cls.__class__
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attr = getattr(cls, meta.attr_name, None)
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if attr:
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cls._registry[attr] = cls
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