All the following are great, especially the (SF) ones ;-)
Tres Seaver wrote:
>>> from zope.interface import Interface, Attribute
>>> from zope.interface import implements, directlyProvides
>>> from zope.component import provideUtility, provideAdapter, adapts
>>> class IFoo(Interface):
... name = Attribute(u'Name')
>>> class FooUtil:
... implements(IFoo)
... def __init__(self, name):
... self.name = name
>>> fooUtil = FooUtil('default')
>>> provideUtility(fooUtil)
>>> fooUtilNamed = FooUtil('named')
>>> provideUtility(fooUtilNamed, name='named')
>>> class FooAdapter:
... implements(IFoo)
... adapts(None)
... name = 'default'
... def __init__(self, context,*args):
... self.context = context
>>> class FooAdapterNamed(FooAdapter):
... name = 'named'
>>> provideAdapter(FooAdapter)
>>> provideAdapter(FooAdapterNamed, name='named')
Now the usage. Things which *don't* work today are marked '(SF)'.
Interfaces called with *no* context argument return
utilities, not adapters (SF)::
>>> u_default = IFoo() # return the default utility
>>> u_default.__class__.__name__, u_default.name
('FooUtil', 'default')
Named utilities can also be looked up (SF)::
>>> u_named = IFoo(name='named')
>>> u_named.__class__.__name__, u_named.name
('FooUtil', 'named')
Default adapter lookup works as expected::
>>> context = object()
>>> a_default = IFoo(context)
>>> a_default.__class__.__name__, a_default.name
('FooAdapter', 'default')
But we can also do named adapter lookup (SF)::
>>> a_named = IFoo(context, name='named')
>>> a_named.__class__.__name__, a_named.name
('FooAdapterNamed', 'named')
I'll note that none of these appear to do contextual lookup.
Would we want a spelling like this which worked with contextual lookup?
One thing I think I mentioned before would be the ability to use
"calling the interface" to get a multi-adapter:
provideAdapter(FooAdapter,adapts=(None,None))
a_default = IFoo(objects=(context,context))
a_default.__class__.__name__, a_default.name
('FooAdapter', 'default')
One other thing, where is the code that gets called when you do
ISomething(..etc...)? I had a look in interface.py and couldn't find
anything :-S
I'd be interested in knocking the above set of extras up on a branch and
seeing what people think...
cheers,
Chris
--
Simplistix - Content Management, Zope & Python Consulting
- http://www.simplistix.co.uk
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