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# File name: dependency.py
# Date: 2008/04/18
# Author: Martin Sivak
#
# Copyright (C) Red Hat 2008
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program 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
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# in a file called COPYING along with this program; if not, write to
# the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA
# 02139, USA.
import logging
import copy
from errors import *
Logger=logging.getLogger("firstaidkit")
class Dependencies(object):
"""Encapsulate flags used to control the dependencies between plugins"""
def __init__(self):
self._provide = None
self._known = set()
self.reset()
def provide(self, id, setactionflag = True):
"""Add flag"""
Logger.info("Setting dependency flag %s", id)
self._provide.add(id)
#Action flags denote activity happening on some regular flag
if setactionflag: self._provide.add(id+"?")
def unprovide(self, id, setactionflag = True):
"""Remove flag"""
Logger.info("Resetting dependency flag %s", id)
try:
self._provide.remove(id)
except KeyError: #not there
pass
if setactionflag: self._provide.add(id+"?")
donotprovide = unprovide #alias
failed = unprovide #alias
def require(self, id):
"""Return True if flag is present, otherwise false"""
return id in self._provide
def introduce(self, s):
"""Notifies the system about dep names used in the plugins.
This allows us to list them in help"""
self._known = self._known.union(s)
def known(self):
"""Returns list of known flags"""
return list(self._known.union(self._provide))
def valid(self):
"""Returns list of valid/provided flags"""
return list(self._provide)
def reset(self):
self._provide = set()
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