# -*- coding: utf-8 -*-
"""The volume system factory."""
[docs]
class Factory(object):
"""Volume system factory."""
_volume_system_types = {}
[docs]
@classmethod
def DeregisterVolumeSystem(cls, volume_system_type):
"""Deregisters a path specification type.
Args:
volume_system_type (type): path specification type.
Raises:
KeyError: if path specification type is not registered.
"""
type_indicator = volume_system_type.TYPE_INDICATOR
if type_indicator not in cls._volume_system_types:
raise KeyError(f'Volume system type: {type_indicator:s} not set.')
del cls._volume_system_types[type_indicator]
[docs]
@classmethod
def NewVolumeSystem(cls, type_indicator):
"""Creates a new path specification for the specific type indicator.
Args:
type_indicator (str): type indicator.
Returns:
VolumeSystem: path specification.
Raises:
KeyError: if path specification is not registered.
"""
if type_indicator not in cls._volume_system_types:
raise KeyError(f'Volume system type: {type_indicator:s} not set.')
volume_system_type = cls._volume_system_types[type_indicator]
return volume_system_type()
[docs]
@classmethod
def RegisterVolumeSystem(cls, volume_system_type):
"""Registers a path specification type.
Args:
volume_system_type (type): path specification type.
Raises:
KeyError: if path specification type is already registered.
"""
type_indicator = volume_system_type.TYPE_INDICATOR
if type_indicator in cls._volume_system_types:
raise KeyError(f'Volume system type: {type_indicator:s} already set.')
cls._volume_system_types[type_indicator] = volume_system_type