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"""
Application data stored by virtualenv.
"""
from __future__ import absolute_import, unicode_literals

from abc import ABCMeta, abstractmethod
from contextlib import contextmanager

import six

from virtualenv.info import IS_ZIPAPP


@six.add_metaclass(ABCMeta)
class AppData(object):
    """Abstract storage interface for the virtualenv application"""

    @abstractmethod
    def close(self):
        """called before virtualenv exits"""

    @abstractmethod
    def reset(self):
        """called when the user passes in the reset app data"""

    @abstractmethod
    def py_info(self, path):
        raise NotImplementedError

    @abstractmethod
    def py_info_clear(self):
        raise NotImplementedError

    @property
    def can_update(self):
        raise NotImplementedError

    @abstractmethod
    def embed_update_log(self, distribution, for_py_version):
        raise NotImplementedError

    @property
    def house(self):
        raise NotImplementedError

    @property
    def transient(self):
        raise NotImplementedError

    @abstractmethod
    def wheel_image(self, for_py_version, name):
        raise NotImplementedError

    @contextmanager
    def ensure_extracted(self, path, to_folder=None):
        """Some paths might be within the zipapp, unzip these to a path on the disk"""
        if IS_ZIPAPP:
            with self.extract(path, to_folder) as result:
                yield result
        else:
            yield path

    @abstractmethod
    @contextmanager
    def extract(self, path, to_folder):
        raise NotImplementedError

    @abstractmethod
    @contextmanager
    def locked(self, path):
        raise NotImplementedError


@six.add_metaclass(ABCMeta)
class ContentStore(object):
    @abstractmethod
    def exists(self):
        raise NotImplementedError

    @abstractmethod
    def read(self):
        raise NotImplementedError

    @abstractmethod
    def write(self, content):
        raise NotImplementedError

    @abstractmethod
    def remove(self):
        raise NotImplementedError

    @abstractmethod
    @contextmanager
    def locked(self):
        pass