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""" The default base class for extension providers. """
# Enthought library imports.
from enthought.traits.api import Event, HasTraits, implements
# Local imports.
from extension_point_changed_event import ExtensionPointChangedEvent
from i_extension_provider import IExtensionProvider
class ExtensionProvider(HasTraits):
""" The default base class for extension providers. """
implements(IExtensionProvider)
#### 'IExtensionProvider' interface #######################################
# The event fired when one of the provider's extension points has been
# changed (where 'changed' means that the provider has added or removed
# contributions to or from an extension point).
extension_point_changed = Event(ExtensionPointChangedEvent)
def get_extension_points(self):
""" Return the extension points offered by the provider. """
return []
def get_extensions(self, extension_point_id):
""" Return the provider's extensions to an extension point. """
return []
##### Protected 'ExtensionProvider' interface #############################
def _fire_extension_point_changed(
self, extension_point_id, added, removed, index
):
""" Fire an extension point changed event. """
self.extension_point_changed = ExtensionPointChangedEvent(
extension_point_id = extension_point_id,
added = added,
removed = removed,
index = index
)
return
#### EOF ######################################################################
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