[Zope-CMF] how to check whether an object is in a catalog

[robert rottermann]

Hi there,
is there a way to check whether an object is indexed?

I would like to dump the state of an object to disk. One of an objects 
attributes is the fact whether it is indexed or not.

I thougth of using a catalog search like
portal_catalog(path="/".join(list(obj.getPhysicalPath())), id=oj.getId())

But this not general since I do not know for sure whether there is a 
path index. And it seems rather expensive.

Robert