[Zope3-dev] Re: adapter registration question

[Chris Withers]

Philipp von Weitershausen wrote:
>   >>> IZopeDublinCore(obj)
> 
> is a flexible version of
> 
>   >>> ZDCAnnotatableAdapter(obj)
> 
> Flexible, because a different implementation that ZDCAnnotatableAdapter 
> might be used. That's dispatched through the adapter registry.

Right, exactly.

>> IZopeDublinCore(myobj) does an adapter lookup based on the type of 
>> 'myobj' 
> 
> That's the lookup in the registry (part 1 of the adapter call)
> 
>> and returns an adapter instance with myobj as context, ready to be used.
> 
> That's the instantiation a la str(123) (part 2 of the adapter call)

Ah, I think this is becoming clearer...

So, as another example, I could register the following as a factory for 
turning instances of DateTime instances into datetime instances:

def convert_dates(date):
    return datetime(year=date.Year(),month=date.Month(),day=date.Month())

The important thing here, for me, is that the adapted value is not an 
instance of the adapter factory.

Am I getting this now?

cheers,

Chris

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