# Copyright (C) 2009, Tutorius.org
# Copyright (C) 2009, Vincent Vinet <vince.vinet@gmail.com>
#
# 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
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
"""
Services

This module supplies services to be used by States, FSMs, Actions and Filters.

Services provided are:
-Access to the running activity
-Access to the running tutorial

TODO: Passing the activity reference should be done by the Probe instead
of being a global variable.
"""


class ObjectStore(object):
    #Begin Singleton code
    instance=None
    def __new__(cls):
        if not ObjectStore.instance:
            ObjectStore.instance = ObjectStore.__ObjectStore()

        return ObjectStore.instance

    #End Singleton code
    class __ObjectStore(object):
        """
        The Object Store is a singleton class that allows access to
        the current runnign activity and tutorial.
        """
        def __init__(self):
            self._activity = None
            self._tutorial = None
            #self._fsm_path = []

        def set_activity(self, activity):
            """Setter for activity"""
            self._activity = activity

        def get_activity(self):
            """Getter for activity"""
            return self._activity

        activity = property(fset=set_activity,fget=get_activity,doc="activity")

        def set_tutorial(self, tutorial):
            """Setter for tutorial"""
            self._tutorial = tutorial

        def get_tutorial(self):
            """Getter for tutorial"""
            return self._tutorial

        tutorial = property(fset=set_tutorial,fget=get_tutorial,doc="tutorial")

    __doc__ = __ObjectStore.__doc__