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OpenStack Study: base_filter.py**** CubicPower OpenStack Study ****
# Copyright (c) 2011-2012 OpenStack Foundation. # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. """ Filter support """ from cinder.openstack.common.scheduler import base_handler
**** CubicPower OpenStack Study **** class BaseFilter(object): """Base class for all filter classes."""
**** CubicPower OpenStack Study **** def _filter_one(self, obj, filter_properties): """Return True if it passes the filter, False otherwise. Override this in a subclass. """ return True
**** CubicPower OpenStack Study **** def filter_all(self, filter_obj_list, filter_properties): """Yield objects that pass the filter. Can be overridden in a subclass, if you need to base filtering decisions on all objects. Otherwise, one can just override _filter_one() to filter a single object. """ for obj in filter_obj_list: if self._filter_one(obj, filter_properties): yield obj
**** CubicPower OpenStack Study **** class BaseFilterHandler(base_handler.BaseHandler): """Base class to handle loading filter classes. This class should be subclassed where one needs to use filters. """
**** CubicPower OpenStack Study **** def get_filtered_objects(self, filter_classes, objs, filter_properties): for filter_cls in filter_classes: objs = filter_cls().filter_all(objs, filter_properties) return list(objs)
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