46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
from .extension import ExtensionManager
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class NamedExtensionManager(ExtensionManager):
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"""Loads only the named extensions.
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This is useful for explictly enabling extensions in a
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configuration file, for example.
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:param namespace: The namespace for the entry points.
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:type namespace: str
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:param names: The names of the extensions to load.
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:type names: str
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:param invoke_on_load: Boolean controlling whether to invoke the
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object returned by the entry point after the driver is loaded.
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:type invoke_on_load: bool
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:param invoke_args: Positional arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_args: tuple
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:param invoke_kwds: Named arguments to pass when invoking
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the object returned by the entry point. Only used if invoke_on_load
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is True.
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:type invoke_kwds: dict
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"""
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def __init__(self, namespace, names,
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invoke_on_load=False, invoke_args=(), invoke_kwds={}):
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self._names = names
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super(NamedExtensionManager, self).__init__(
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namespace,
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invoke_on_load=invoke_on_load,
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invoke_args=invoke_args,
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invoke_kwds=invoke_kwds,
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)
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def _load_one_plugin(self, ep, invoke_on_load, invoke_args, invoke_kwds):
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# Check the name before going any further to prevent
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# undesirable code from being loaded at all if we are not
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# going to use it.
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if ep.name not in self._names:
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return None
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return super(NamedExtensionManager, self)._load_one_plugin(
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ep, invoke_on_load, invoke_args, invoke_kwds,
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)
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