Source code for zope.component._declaration

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"""Adapter declarations
"""
import sys


[docs] 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
[docs] 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)
[docs] 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__')