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Direktori : /lib/python2.7/site-packages/zope/component/ |
Current File : //lib/python2.7/site-packages/zope/component/_declaration.py |
############################################################################## # # Copyright (c) 2001, 2002 Zope Foundation and Contributors. # All Rights Reserved. # # This software is subject to the provisions of the Zope Public License, # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS # FOR A PARTICULAR PURPOSE. # ############################################################################## """Adapter declarations """ import sys from zope.component._compat import CLASS_TYPES class adapter(object): def __init__(self, *interfaces): self.interfaces = interfaces def __call__(self, ob): if isinstance(ob, CLASS_TYPES): ob.__component_adapts__ = _adapts_descr(self.interfaces) else: ob.__component_adapts__ = self.interfaces return ob def adapts(*interfaces): frame = sys._getframe(1) locals = frame.f_locals # Ensure we were called from a class def. if locals is frame.f_globals or '__module__' not in locals: raise TypeError("adapts can be used only from a class definition.") if '__component_adapts__' in locals: raise TypeError("adapts can be used only once in a class definition.") locals['__component_adapts__'] = _adapts_descr(interfaces) def adaptedBy(ob): return getattr(ob, '__component_adapts__', None) class _adapts_descr(object): def __init__(self, interfaces): self.interfaces = interfaces def __get__(self, inst, cls): if inst is None: return self.interfaces raise AttributeError('__component_adapts__')