def __init__(cls, what, bases=None, dict=None):
super(AdapterMeta, cls).__init__(what, bases, dict)
if not is_abstract(cls):
for protocol in getattr(cls, 'supported_protocols', ()):
# Note that we will not overwrite existing registered adapters.
adapter_registry.setdefault(protocol, cls)
def __init__(cls, what, bases=None, dict=None):
super(CommandMeta, cls).__init__(what, bases, dict)
if not is_abstract(cls):
command = getattr(cls, 'command')
if command:
command_registry[command] = cls
def __init__(cls, what, bases=None, dict=None):
super(AdapterMeta, cls).__init__(what, bases, dict)
if not is_abstract(cls):
for protocol in getattr(cls, 'supported_protocols', ()):
# Note that we will not overwrite existing registered adapters.
adapter_registry.setdefault(protocol, cls)
def __init__(cls, what, bases=None, dict=None):
super(CommandMeta, cls).__init__(what, bases, dict)
if not is_abstract(cls):
command = getattr(cls, 'command')
if command:
command_registry[command] = cls
def is_filter_type(target: typing.Any) -> typing.Union[bool, str]:
"""
Returns whether the specified object can be registered as a filter.
:return:
Returns ``True`` if the object is a filter.
Otherwise, returns a string indicating why it is not valid.
"""
if not is_class(target):
return 'not a class'
if not issubclass(target, BaseFilter):
return 'does not extend BaseFilter'
if is_abstract(target):
return 'abstract class'
return True
def __init__(self, cls_name, bases, attrs):
super(_metaclass, self) \
.__init__(cls_name, bases, attrs)
if not is_abstract(self):
tag_registry.register(self)
def __init__(self, what, bases=None, attrs=None):
super(_metaclass, self).__init__(what, bases, attrs)
if not is_abstract(self):
registry.register(self)
