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Diffstat (limited to 'interface.py')
-rw-r--r-- | interface.py | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/interface.py b/interface.py new file mode 100644 index 0000000..f4800f0 --- /dev/null +++ b/interface.py @@ -0,0 +1,47 @@ +# Copyright (c) 2000-2004 LOGILAB S.A. (Paris, FRANCE). +# http://www.logilab.fr/ -- mailto:contact@logilab.fr +# +# 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., +# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. +""" + bases class for interfaces + + TODO: + _ implements a check method which check that an object implements the + interface + _ Attribute objects + + This module requires at least python 2.2 +""" + +__revision__ = "$Id: interface.py,v 1.6 2004-05-10 14:40:50 syt Exp $" + +from types import ListType, TupleType + +class Interface: + """base class for interfaces""" + def is_implemented_by(cls, instance): + return implements(instance, cls) + is_implemented_by = classmethod(is_implemented_by) + +def implements(instance, interface): + """return true if the instance implements the interface + """ + if hasattr(instance, "__implements__") and \ + (interface is instance.__implements__ or + (type(instance.__implements__) in (ListType, TupleType) and \ + interface in instance.__implements__)): + return 1 + return 0 + + |