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import abc
from pip._internal.index.package_finder import PackageFinder
from pip._internal.metadata.base import BaseDistribution
from pip._internal.req import InstallRequirement
class AbstractDistribution(metaclass=abc.ABCMeta):
"""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: InstallRequirement) -> None:
super().__init__()
self.req = req
@abc.abstractmethod
def get_metadata_distribution(self) -> BaseDistribution:
raise NotImplementedError()
@abc.abstractmethod
def prepare_distribution_metadata(
self, finder: PackageFinder, build_isolation: bool
) -> None:
raise NotImplementedError()