Source code for openmdao.utils.class_util

"""Various utils dealing with classes."""

import weakref

[docs]def overrides_method(method_name, obj, base): """ Return True if the named base class method is overridden by obj. Parameters ---------- method_name : str Name of the method to search for. obj : object An object that is assumed to inherit from base. base : class The base class that contains the base version of the named method. Returns ------- bool True if the named base clas is overridden by the given obj, otherwise False. """ for klass in obj.__class__.__mro__: if method_name in klass.__dict__: return klass is not base return False
[docs]class WeakMethodWrapper(object): """ A class to contain a weak ref to a method. weakerf.ref(obj.method) doesn't work, so this class will wrap a weak ref to the method's parent object, look the method up in that instance by name, and call it. Parameters ---------- obj : object The instance object. fname : str The name of the method. Attributes ---------- _ref : weakerf The weakref to the method's owning instance. __name__ : str The name of the method. """
[docs] def __init__(self, obj, fname): """ Initialize the wrapper. """ self._ref = weakref.ref(obj) self.__name__ = fname
def __call__(self, *args, **kwargs): """ Call the named method on the object. Parameters ---------- *args : tuple of obj Positional args. **kwargs : dict Named args. Returns ------- object The return value of the wrapped method called with the given args. """ return getattr(self._ref(), self.__name__)(*args, **kwargs)