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import abc
from pip._vendor.six import add_metaclass
@add_metaclass(abc.ABCMeta)
class AbstractDistribution(object):
"""A base class for handling installable artifacts.
The requirements for anything installable are as follows:
- we must be able to determine the requirement name
(or we can't correctly handle the non-upgrade case).
- for packages with setup requirements, we must also be able
to determine their requirements without installing additional
packages (for the same reason as run-time dependencies)
- we must be able to create a Distribution object exposing the
above metadata.
"""
def __init__(self, req):
super(AbstractDistribution, self).__init__()
self.req = req
@abc.abstractmethod
def get_pkg_resources_distribution(self):
raise NotImplementedError()
@abc.abstractmethod
def prepare_distribution_metadata(self, finder, build_isolation):
raise NotImplementedError()
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