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# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the license found in the
# LICENSE file in the root directory of this source tree.
import logging
from abc import ABCMeta, abstractmethod
from mmengine.logging import print_log
class BaseStorageBackend(metaclass=ABCMeta):
"""Abstract class of storage backends.
All backends need to implement two apis: :meth:`get()` and
:meth:`get_text()`.
- :meth:`get()` reads the file as a byte stream.
- :meth:`get_text()` reads the file as texts.
"""
# a flag to indicate whether the backend can create a symlink for a file
# This attribute will be deprecated in future.
_allow_symlink = False
@property
def allow_symlink(self):
print_log(
'allow_symlink will be deprecated in future',
logger='current',
level=logging.WARNING)
return self._allow_symlink
@property
def name(self):
return self.__class__.__name__
@abstractmethod
def get(self, filepath):
pass
@abstractmethod
def get_text(self, filepath):
pass
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