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See the GNU General Public License for # more details. # # You should have received a copy of the GNU General Public License along with # this program. If not, see . from __future__ import absolute_import, print_function, unicode_literals __metaclass__ = type __all__ = [ 'Plugin', ] from janitor.plugincore.exceptions import UnimplementedMethod class Plugin: """Base class for plugins. These plugins only do one thing: identify cruft. See the 'get_cruft' method for details. """ # XXX BAW 2012-06-08: For historical reasons, we do not set # self._condition or self.app in a constructor. This needs to be fixed. @property def condition(self): return (self._condition if hasattr(self, '_condition') else []) @condition.setter def condition(self, condition): self._condition = condition def set_application(self, app): """Set the Application instance this plugin belongs to.""" self.app = app def do_cleanup_cruft(self): """Find cruft and clean it up. This is a helper method. """ for cruft in self.get_cruft(): cruft.cleanup() self.post_cleanup() def get_cruft(self): """Find some cruft in the system. This method MUST return an iterator (see 'yield' statement). This interface design allows cruft to be collected piecemeal, which makes it easier to show progress in the user interface. The base class default implementation of this raises an exception. Subclasses MUST override this method. """ raise UnimplementedMethod(self.get_cruft) @property def cruft(self): for cruft in self.get_cruft(): yield cruft def post_cleanup(self): """Do plugin-wide cleanup after the individual cleanup was performed. This is useful for stuff that needs to be processed in batches (e.g. for performance reasons) like package removal. """ pass