[Zope3-dev] Re: adaptation based on class rather than interface

[Rocky Burt]

On Thu, 2006-09-11 at 11:13 +0000, Chris Withers wrote:
> I find myself often having to define pure marker interfaces for each 
> class that I define, purely so I can register adapters for objects of 
> that class.

I do this frequently when I want to adapt classes I have no control over
(such as in Products.CMFPlone, etc).

Personally I'm a little pragmatic ... 
  1) I tend to adapt the classes first
  2) as more flexibility is required, I introduce a new marker interface
and apply it to the previous class
  3) then change the ZCML/adapter mapping to apply to the marker
interface

Since the consumers of the adapters never need to be changed no matter
how the adapters are rigged up, I'm safe.

- Rocky

-- 
Rocky Burt
ServerZen Software -- http://www.serverzen.com
News About The Server (blog) -- http://www.serverzen.net
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