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import types, itkBase
not_loaded = 'not loaded'
class LazyITKModule(types.ModuleType):
"""Subclass of ModuleType that implements a custom __getattribute__ method
to allow lazy-loading of attributes from ITK sub-modules."""
def __init__(self, name, lazy_attributes):
types.ModuleType.__init__(self, name)
self.__lazy_attributes = lazy_attributes
for k in lazy_attributes:
setattr(self, k, not_loaded)
def __getattribute__(self, attr):
value = types.ModuleType.__getattribute__(self, attr)
if value is not_loaded:
module = self.__lazy_attributes[attr]
namespace = {}
itkBase.LoadModule(module, namespace)
# Load into 'namespace' first, then self.__dict__ (via setattr) to
# prevent the warnings about overwriting the 'NotLoaded' values already
# in in self.__dict__ we would get if we just passed self.__dict__ to
# itkBase.LoadModule.
for k, v in namespace.items():
setattr(self, k, v)
value = namespace[attr]
return value
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