[Zope-CMF] [dev] Unauthorized and CMFCoreExceptions: small proposal

[Yuppie]

Hi!


3 months ago I added CMFCoreExceptions to CVS HEAD. There were two 
reasons to do that:

1.) Exceptions are easier to handle and to make usable TTW if they are 
in one place like permissions.

2.) Hierarchically structured Exceptions provide additional 
possibilities to catch groups of them are add special code.


I still believe in reason one. Given the fact bare excepts are evil and 
(most) class exceptions need to be imported to catch them we have to 
make them available in Scripts. (We didn't need that with the old string 
exceptions.)

Based one the recent discussion I propose to add these aliases:

'AccessControl_Unauthorized' to raise Unauthorized
'zExceptions_Unauthorized' to catch Unauthorized
'CopyError' (already there)
'ResourceLockedError'
and other Zope error aliases and CMF errors if needed


There are not many people who like the complexity added by 
hierarchically structured Exceptions. I propose to remove the hierarchy 
again ('CMFError', 'CMFNotImplementedError', 'CMFUnauthorizedError', 
'CMFResourceLockedError'), at least for now.

These classes existed only in CVS HEAD and were not very useful because 
they are just some pieces of a hierarchy, so I think they can be removed 
without providing any backwards compatibility.


If there are no objections I'll soon make a checkin based on this proposal.

Cheers,
	Yuppie