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"""AuthroityStringTransformer."""
from users_text_manager import AUTHORITY
class AuthorityStringTransformerError(Exception):
"""Error raised by AuthorityStringTransformer."""
pass
class AuthorityStringTransformer: # pylint:disable=W0232
"""Transforms authority between number and strin format."""
@staticmethod
def to_string(authority):
"""Transform number authority value to string value.
Args:
authority: Authority in number format.
Returns:
authority: Corrosponding authority in string format.
"""
if authority == AUTHORITY.READONLY:
return 'RO'
elif authority == AUTHORITY.READWRITE:
return 'RW'
raise AuthorityStringTransformerError('Invalid number.')
@staticmethod
def to_number(string):
"""Transform string authority value to number value.
Args:
authority: Authority in string format.
Returns:
authority: Corrosponding authority in number format.
"""
if string == 'RO':
return AUTHORITY.READONLY
elif string == 'RW':
return AUTHORITY.READWRITE
raise AuthorityStringTransformerError('Invalid string.')
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