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# Copyright 2016, Tresys Technology, LLC
# Copyright 2018, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
from typing import Optional
from ..exception import MLSDisabled
from ..policyrep import Context
from .difference import Wrapper
from .mls import RangeWrapper
from .roles import role_wrapper_factory
from .types import type_wrapper_factory
from .users import user_wrapper_factory
class ContextWrapper(Wrapper[Context]):
"""Wrap contexts to allow comparisons."""
__slots__ = ("user", "role", "type_", "range_")
def __init__(self, ctx: Context) -> None:
self.origin = ctx
self.user = user_wrapper_factory(ctx.user)
self.role = role_wrapper_factory(ctx.role)
self.type_ = type_wrapper_factory(ctx.type_)
try:
self.range_: Optional[RangeWrapper] = RangeWrapper(ctx.range_)
except MLSDisabled:
self.range_ = None
def __hash__(self):
return hash(self.origin)
def __eq__(self, other):
return self.user == other.user and \
self.role == other.role and \
self.type_ == other.type_ and \
self.range_ == other.range_
def __lt__(self, other):
return self.user < other.user and \
self.role < other.role and \
self.type_ < other.type_ and \
self.range_ < other.range_