def resolve_topic(topic):
"""Return class described by given topic.
Args:
topic: A string describing a class.
Returns:
A class.
Raises:
TopicResolutionError: If there is no such class.
"""
# Substitute one topic for another, if so defined.
# - this allows classes to be moved and renamed
topic = substitutions.get(topic, topic)
# Partition topic into module and class names.
module_name, _, class_name = topic.partition('#')
# Import the module.
try:
module = importlib.import_module(module_name)
except ImportError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
# Identify the class.
try:
cls = resolve_attr(module, class_name)
except AttributeError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
return cls
def resolve_topic(topic: str) -> Any:
"""
Resolves topic to the object it references.
:param topic: A string describing a code object (e.g. an object class).
:raises TopicResolutionError: If there is no such class.
:return: Code object that the topic references.
"""
# Substitute one topic for another, if so defined.
# - this allows classes to be moved and renamed
topic = substitutions.get(topic, topic)
# Partition topic into module and class names.
module_name, _, class_name = topic.partition("#")
# Import the module.
try:
module = importlib.import_module(module_name)
except ImportError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
# Identify the class.
try:
cls = resolve_attr(module, class_name)
except AttributeError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
return cls
def resolve_domain_topic(topic):
"""Return domain class described by given topic.
Args:
topic: A string describing a domain class.
Returns:
A domain class.
Raises:
TopicResolutionError: If there is no such domain class.
"""
try:
module_name, _, class_name = topic.partition('#')
module = importlib.import_module(module_name)
except ImportError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
try:
cls = resolve_attr(module, class_name)
except AttributeError as e:
raise TopicResolutionError("{}: {}".format(topic, e))
return cls