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# Copyright 2014-2015, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from abc import ABC, abstractmethod
from logging import Logger
from typing import Iterable
from .policyrep import SELinuxPolicy
class PolicyQuery(ABC):
"""Abstract base class for SELinux policy queries."""
log: Logger
policy: SELinuxPolicy
def __init__(self, policy: SELinuxPolicy, **kwargs) -> None:
self.policy = policy
# keys are sorted in reverse order so regex settings
# are set before the criteria, e.g. name_regex
# is set before name. This ensures correct behavior
# since the criteria descriptors are sensitve to
# regex settings.
for name in sorted(kwargs.keys(), reverse=True):
attr = getattr(self, name, None) # None is not callable
if callable(attr):
raise ValueError("Keyword parameter {0} conflicts with a callable.".format(name))
setattr(self, name, kwargs[name])
@abstractmethod
def results(self) -> Iterable:
"""
Generator which returns the matches for the query. This method
should be overridden by subclasses.
"""
pass