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import json
from abc import abstractmethod, ABC
from typing import TypeVar, Type, Union, AnyStr, TextIO
_T = TypeVar('_T', bound='Config')
class InvalidConfigTypingException(Exception):
pass
class ConfigValueMissingException(Exception):
pass
class Config(ABC):
@classmethod
@abstractmethod
def get_name(cls) -> str:
pass
@classmethod
@abstractmethod
def parse_dict(cls: Type[_T], data: dict) -> _T:
pass
@classmethod
def load(cls: Type[_T], file: Union[AnyStr, TextIO]) -> _T:
if hasattr(file, 'read'):
return cls.loads(file.read())
with open(file) as fp:
return cls.load(fp)
@classmethod
def loads(cls: Type[_T], text: str) -> _T:
return cls.parse_dict(json.loads(text))
@classmethod
def get_instance(cls: Type[_T]) -> _T:
return cls
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