[Zope] object manager - getOb(...) - parameter '_marker'

[friedrich steindl]

the parameter being so easy makes my problem more complicated :-))

but through this i know now where i lost my way


thank you


fritz
(-:fs)

========================================================

Am Dienstag, 7. Dezember 2004 12:42 tippte Pascal Peregrina:
> If the object is not found, this raises an Exception unless you have
> explicitely given a default value (in that case that value is returned).
>
> So _marker is just used to know if a default value has been given by the
> caller (and that value can be None).
>
> Pascal
>
>
> -----Message d'origine-----
> De : zope-bounces at zope.org [mailto:zope-bounces at zope.org]De la part de
> friedrich steindl
> Envoyé : mardi 7 décembre 2004 12:47
> À : zope at zope.org
> Objet : [Zope] object manager - getOb(...) - parameter '_marker'
>
>
> hi,
>
> can somebody give me a hint what the parameter '_marker' is meant for in
> this
> code of the zope object manager -
>
>     def _getOb(self, id, default=_marker):
>         # FIXME: what we really need to do here is ensure that only
>         # sub-items are returned. That could have a measurable hit
>         # on performance as things are currently implemented, so for
>         # the moment we just make sure not to expose private attrs.
>         if id[:1] != '_' and hasattr(aq_base(self), id):
>             return getattr(self, id)
>         if default is _marker:
>             raise AttributeError, id
>         return default
>
>
> _marker ist declared as an empty list at the beginning of the module, but
> outside of the object manager class
>
> ... and as i believe has something to do with the path to (container of)
> the
>
> object ???
>
>
> thx for any hints
>
> steindl friedrich
>        (-:fs)
>
>
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