def fetch_persistence_class(cls, object_type: CdmObjectType,
persistence_type: str) -> 'object':
object_name = object_type.name.lower() # CdmObjectType[object_type]
if object_name.endswith('def'):
object_name = object_name[0:-4]
elif object_name.endswith('ref'):
object_name += 'erence'
persistence_module_name = '{}_persistence'.format(object_name)
persistence_class_name = ''.join(
[x.title() for x in persistence_module_name.split('_')])
if persistence_class_name == 'ProjectionPersistence':
# Projection persistence class is in a nested folder
persistence_module = importlib.import_module(
'cdm.persistence.{}.projections.{}'.format(
persistence_type.lower(), persistence_module_name))
else:
persistence_module = importlib.import_module(
'cdm.persistence.{}.{}'.format(persistence_type.lower(),
persistence_module_name))
PersistenceClass = getattr(persistence_module, persistence_class_name,
None)
if not PersistenceClass:
raise CdmError(
'Persistence class for {} is not implemented in type {}.'.
format(persistence_class_name, persistence_type))
instance = PersistenceClass()
return instance
def _get_persistence_class(object_type: CdmObjectType,
persistence_type: str) -> object:
# persistence_layer: { [id: string]: IPersistence } = PersistenceTypes[persistence_type] as { [id: string]: IPersistence }
# if persistence_layer:
object_name = object_type.name.lower() # CdmObjectType[object_type]
if object_name.endswith('def'):
object_name = object_name[0:-4]
elif object_name.endswith('ref'):
object_name += 'erence'
persistence_module_name = '{}_persistence'.format(object_name)
persistence_class_name = ''.join(
[x.title() for x in persistence_module_name.split('_')])
TargetClass = getattr(
importlib.import_module('cdm.persistence.{}.{}'.format(
persistence_type.lower(), persistence_module_name)),
persistence_class_name)
instance = TargetClass()
if not instance:
raise CdmError(
'Persistence class {} not implemented for type {}'.format(
persistence_class_name, persistence_type))
return instance