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##############################################################################
#
# 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
class adapter:
"""
Decorator that declares that the decorated object adapts the given
*interfaces*.
This is commonly used in conjunction with :obj:`zope.interface.implementer`
to declare what adapting the *interfaces* will provide.
"""
def __init__(self, *interfaces):
self.interfaces = interfaces
def __call__(self, ob):
if isinstance(ob, type):
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 the *interfaces* that *ob* will adapt, as declared by
:obj:`adapter`.
"""
return getattr(ob, '__component_adapts__', None)
def getName(ob):
return getattr(ob, '__component_name__', '')
class _adapts_descr:
def __init__(self, interfaces):
self.interfaces = interfaces
def __get__(self, inst, cls):
if inst is None:
return self.interfaces
raise AttributeError('__component_adapts__')
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