| # Copyright 2014, Tresys Technology, LLC |
| # |
| # This file is part of SETools. |
| # |
| # SETools is free software: you can redistribute it and/or modify |
| # it under the terms of the GNU Lesser General Public License as |
| # published by the Free Software Foundation, either version 2.1 of |
| # the License, or (at your option) any later version. |
| # |
| # SETools is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU Lesser General Public License for more details. |
| # |
| # You should have received a copy of the GNU Lesser General Public |
| # License along with SETools. If not, see |
| # <http://www.gnu.org/licenses/>. |
| # |
| |
| |
| class PolicySymbol(object): |
| |
| """This is a base class for all policy objects.""" |
| |
| def __init__(self, policy, qpol_symbol): |
| """ |
| Parameters: |
| policy The low-level policy object. |
| qpol_symbol The low-level policy symbol object. |
| """ |
| |
| assert qpol_symbol |
| |
| self.policy = policy |
| self.qpol_symbol = qpol_symbol |
| |
| def __str__(self): |
| return self.qpol_symbol.name(self.policy) |
| |
| def __hash__(self): |
| return hash(self.qpol_symbol.name(self.policy)) |
| |
| def __eq__(self, other): |
| try: |
| return self.qpol_symbol.this == other.qpol_symbol.this |
| except AttributeError: |
| return str(self) == str(other) |
| |
| def __ne__(self, other): |
| return not self == other |
| |
| def __lt__(self, other): |
| """Comparison used by Python sorting functions.""" |
| return str(self) < str(other) |
| |
| def __repr__(self): |
| return "<{0.__class__.__name__}(<qpol_policy_t id={1}>,\"{0}\")>".format( |
| self, id(self.policy)) |
| |
| def __deepcopy__(self, memo): |
| # shallow copy as all of the members are immutable |
| cls = self.__class__ |
| newobj = cls.__new__(cls) |
| newobj.policy = self.policy |
| newobj.qpol_symbol = self.qpol_symbol |
| memo[id(self)] = newobj |
| return newobj |
| |
| def statement(self): |
| """ |
| A rendering of the policy statement. This should be |
| overridden by subclasses. |
| """ |
| raise NotImplementedError |
