What does TFEI stand for?  Thanks.

Bob Jarvis
The Timken Company

> -----Original Message-----
> From:	Norton, Chris [SMTP:chrisn at Kronos.com]
> Sent:	Monday, August 16, 1999 4:29 PM
> To:	'squeak at cs.uiuc.edu'
> Subject:	RE: Re: Exception Hierarchies
> 
> Hi Folks.
> 
> This response was written with the philosophy: "1) open mouth. 2) insert
> foot to kneecap."  So, Alan, I am NOT trying to criticize you.  :-)
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Alan Lovejoy [sourcery at pacbell.net] wrote:
> [...snip...]
> > Ah, then perhaps the problem is simply that "Error" is misnamed.
> > 
> > I suggest the following hierarchy:
> > 
> > Exception (the root class, takes no action if no handler is found,
> > proceedable by default)
> > 	DefaultHandlerException (takes some default action if no handler is
> > found)
> > 		HandlerRequiredException (raises NoHandlerException if no
> > handler)
> > 			ErrorException (root of all errors, not proceedable
> > by default)
> > 			WarningException 
> > 		NoHandlerException	(raised when no handler is found for
> > a 
> > 					HandlerRequiredException, opens
> > 					default "UnhandledException"
> > notifier
> > 					if no handler found for NoHandler
> > exception)
> > 		ControlException 
> > 			HaltException
> > 			UserInterruptException 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> I'm not an expert on Exception handling, but I sure find it handy to say:
> 
>     ["some risky code"] on: Error do: ["clean up after my code died"].
> 
> I think that Error is a good "catch all" name for (near-)fatal exceptions.
> Having said that, I'd like to point out that in VSE, there is an exception
> handler called KeyboardInterrupt() that happens when you hit Ctrl-Break.
> This interrupt is subclassed from Notification(), which is not subclassed
> from Error.  Perhaps the Halt and UserInterrupt should be subclassed from
> Notification() in Squeak.  After all, they aren't really errors.  They are
> simply interruptions that can (usually) be resumed.
> 
> Just my $0.02.  Cheers to Craig Latta, the folks at TFEI and to Steven
> Pope
> for making Exceptions happen in Squeak!!
> 
> ---==> Chris