[Zope3-Users] Contained File object

[Dominik Huber]

Hi Tom,

>
> Should zope.app.file.File implement IContained?  Why / Why not?
> Here's a comparison b/w adding a Folder and File...

The container framework does not require mandatory ILocation or 
IContained for its containment. In absent of ILocation or IContained a 
contained proxy is used (comparable to zope 2's context wrappers) to 
provided
IContained. (See ../src/zope/app/container/contained.py -> function 
containedEvent())

Example:
An object providing IContained can be called both ways:
 >>> root['folder'] = folder = Folder()
 >>> zapi.getName(folder)
u'b'

 >>> zapi.getName(root['folder'])
u'b'

An object that does not provid IContained. Has a different behavior.
Calling the original object whitout the contained proxy:
 >>> root['file'] = file = File()
 >>> zapi.getName(file)
Traceback (most recent call last):
...
TypeError: ('Could not adapt', <zope.app.file.file.File object at 
0x00E23970>, <
InterfaceClass zope.app.traversing.interfaces.IPhysicallyLocatable>)

Calling the contain proxied object:

 >>> zapi.getName(root['file'])
u'a'

Regards,
Dominik Huber

Projekt01 GmbH
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