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Singleton.py

#!/usr/bin/env python

# Copyright (C) 2009,2010 Junta de Andalucia
# 
# Authors:
#   Roberto Majadas <roberto.majadas at openshine.com>
#   Cesar Garcia Tapia <cesar.garcia.tapia at openshine.com>
#   Luis de Bethencourt <luibg at openshine.com>
#   Pablo Vieytes <pvieytes at openshine.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, 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 Street, Fifth Floor, Boston, MA  02110-1301
# USA

import gobject

class Singleton(gobject.GObjectMeta):
    def __init__(cls, name, bases, dict):
        super(Singleton, cls).__init__(name, bases, dict)
        cls.instance = None
        
    def __call__(cls, *args, **kw):
        if cls.instance is None:
            cls.instance = super(Singleton, cls).__call__(*args, **kw)
        return cls.instance


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