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83 lines
3.0 KiB
83 lines
3.0 KiB
#!/usr/bin/env python
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# -*- encoding: utf-8 -*-
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from types import ModuleType
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from typing import List
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class Registry:
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"""This is a registry class used to register classes and modules so that a universal
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object builder can be enabled.
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Args:
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name (str): The name of the registry .
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third_party_library (list, optional):
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List of third party libraries which are used in the initialization of the register module.
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"""
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def __init__(self, name: str, third_party_library: List[ModuleType] = None):
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self._name = name
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self._registry = dict()
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self._third_party_lib = third_party_library
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@property
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def name(self):
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return self._name
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def register_module(self, module_class):
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"""Registers a module represented in `module_class`.
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Args:
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module_class (class): The module to be registered.
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Returns:
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class: The module to be registered, so as to use it normally if via importing.
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Raises:
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AssertionError: Raises an AssertionError if the module has already been registered before.
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"""
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module_name = module_class.__name__
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assert module_name not in self._registry, f"{module_name} not found in {self.name}"
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self._registry[module_name] = module_class
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# return so as to use it normally if via importing
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return module_class
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def get_module(self, module_name: str):
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"""Retrieves a module with name `module_name` and returns the module if it has
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already been registered before.
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Args:
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module_name (str): The name of the module to be retrieved.
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Returns:
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:class:`object`: The retrieved module or None.
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Raises:
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NameError: Raises a NameError if the module to be retrieved has neither been
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registered directly nor as third party modules before.
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"""
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if module_name in self._registry:
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return self._registry[module_name]
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elif self._third_party_lib is not None:
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for lib in self._third_party_lib:
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if hasattr(lib, module_name):
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return getattr(lib, module_name)
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raise NameError(f"Module {module_name} not found in the registry {self.name}")
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def has(self, module_name: str):
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"""Searches for a module with name `module_name` and returns a boolean value indicating
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whether the module has been registered directly or as third party modules before.
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Args:
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module_name (str): The name of the module to be searched for.
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Returns:
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bool: A boolean value indicating whether the module has been registered directly or
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as third party modules before.
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"""
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found_flag = module_name in self._registry
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if self._third_party_lib:
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for lib in self._third_party_lib:
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if hasattr(lib, module_name):
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found_flag = True
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break
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return found_flag
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