SAX2: Should SAXException extend IOException?

[twleung at sauria.com]

What about a SAX driver that spits out events by walking a DOM?  
If the DOM was created programatically, it doesn't really seem like an
IOException is the right thing to throw.

Ted
----- Original Message ----- 
From: David Megginson <david at megginson.com>
To: <xml-dev at ic.ac.uk>
Sent: Thursday, December 23, 1999 4:04 AM
Subject: Re: SAX2: Should SAXException extend IOException?


> Ray Waldin <rwaldin at pacbell.net> writes:
> 
> > from David's SAX2 Exceptions proposal:
> > > 5. Have all callbacks that formerly threw SAXException throw
> > >    IOException instead.  This should help to avoid a lot of exception
> > >    tunneling.
> > 
> > I don't see the point in a Handler throwing an IOException to a
> > Parser in most cases.  That is what this item implies, right?  What
> > could a DocumentHandler mean by throwing an IOException during a
> > call to startElement?  The I/O has already occurred before the
> > handler gets involved.
> 
> Well, that's really domain-specific.  It could be that a handler in an
> XML I/O library does additional I/O (such as retrieving an external
> bitmap) which, from the top-level application's point of view, is
> still part of the same I/O process.
> 
> In the end, though, this is a relatively minor point.  The important
> point, for me, is that SAXException extend IOException -- I think that 
> it would be convenient to have the callbacks throw IOException rather
> than SAXException (otherwise, other IOExceptions will have to tunnel), 
> but it's not a show-stopper if everyone else thinks it's a bad idea.
> 
> 
> All the best,
> 
> 
> David
> 
> -- 
> David Megginson                 david at megginson.com
>            http://www.megginson.com/
> 
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