[Zope3-Users] Adapting a builtin?
Roger Ineichen
dev at projekt01.ch
Wed Dec 7 03:38:50 EST 2005
Hi Jim,
can you confirm that this is a valid concept for
the adapter registry or do we get trouble in the future?
I didn't find any sample in the README.txt files about adapting
builtin strings like a "principal_id").
Hi Michael and Mac
> -----Original Message-----
> From: zope3-users-bounces at zope.org
> [mailto:zope3-users-bounces at zope.org] On Behalf Of Michael Howitz
> Sent: Wednesday, December 07, 2005 8:59 AM
> To: Paul Winkler
> Cc: zope3-users at zope.org
> Subject: Re: [Zope3-Users] Adapting a builtin?
>
> On Tue, 2005-12-06 at 18:44 -0500, Paul Winkler wrote:
> > Hi,
> >
> > Is it possible to register an adapter for a builtin type
> > such as str? All the adapter examples I see use an
> interface for the
> > "for" attribute.
> >
> > Something like:
> >
> > <adapter for="str"
> > provides=".interfaces.IHTTPConnection"
> > factory="httplib.HTTPConnection"
> > />
>
> Hi,
>
> in plain Zope3 (I'm not using Five, but it may be similar there.) you
> can declare an interface for the buitin: (e.g. in interfaces.py)
>
> class interface IStr(Interface):
> # define the methods here which you need to access
> def upper():
> "upper ... as an example"
>
> In configure.zcml, you declare the interface for the builtin:
>
> <class class="str">
> <implements interface=".interfaces.IStr" />
> </class>
>
> <adapter
> for=".interfaces.IStr"
> provides=".interfaces.IHTTPConnection"
> factory="httplib.HTTPConnection"
> />
>
> Then you can do:
> IHTTPConnection('string') to get the adapter.
>
> HTH,
> mac
That's a interesting question. I do it also, but in a different
way. It works for me like this and the adapter registry and
persistence work well.
--------------
class PrincipalMessagesForPrincipalId(BaseMessages):
"""Base implementation for principal annotation based messages."""
adapts(IAttributeAnnotatable, str)
implements(IPrincipalMessages)
messageQueueKey = 'PrincipalMessages'
def __init__(self, context, principalId):
"""Initialize with a context."""
self.context = context
self.principalId = principalId
--------------
With adapts() and implements() you can use a simply registration
like:
--------------
<adapter factory=".adapters.PrincipalMessagesForPrincipalId" />
--------------
Regards
Roger Ineichen
Projekt01 GmbH
www.projekt01.ch
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