SAX2: Should SAXException extend IOException?
david at megginson.com
Thu Dec 23 12:05:36 GMT 1999
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 Megginson david at megginson.com
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