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Editing: defaultquery.py

# Copyright 2014-2015, Tresys Technology, LLC
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import logging
import re
from typing import cast, Iterable

from .query import PolicyQuery
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .mixins import MatchObjClass
from .policyrep import AnyDefault, DefaultRange, DefaultRuletype, DefaultValue, DefaultRangeValue

class DefaultQuery(MatchObjClass, PolicyQuery):

"""
    Query default_* statements.

Parameter:
    policy          The policy to query.

Keyword Parameters/Class attributes:
    ruletype        The rule type(s) to match.
    tclass          The object class(es) to match.
    tclass_regex    If true, use a regular expression for
                    matching the rule's object class.
    default         The default to base new contexts (e.g. "source" or "target")
    default_range   The range to use on new context, default_range only
                    ("low", "high", "low_high")
    """

ruletype = CriteriaSetDescriptor(enum_class=DefaultRuletype)
    default = CriteriaDescriptor(enum_class=DefaultValue)
    default_range = CriteriaDescriptor(enum_class=DefaultRangeValue)

def __init__(self, policy, **kwargs) -> None:
        super(DefaultQuery, self).__init__(policy, **kwargs)
        self.log = logging.getLogger(__name__)

def results(self) -> Iterable[AnyDefault]:
        """Generator which yields all matching default_* statements."""
        self.log.info("Generating default_* results from {0.policy}".format(self))
        self.log.debug("Ruletypes: {0.ruletype!r}".format(self))
        self._match_object_class_debug(self.log)
        self.log.debug("Default: {0.default!r}".format(self))
        self.log.debug("Range: {0.default_range!r}".format(self))

for d in self.policy.defaults():
            if self.ruletype and d.ruletype not in self.ruletype:
                continue

if not self._match_object_class(d):
                continue

if self.default and d.default != self.default:
                continue

if self.default_range:
                try:
                    if cast(DefaultRange, d).default_range != self.default_range:
                        continue
                except AttributeError:
                    continue

yield d

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