SAX RFD: ModSAX Predefined Features
David Megginson
david at megginson.com
Mon Mar 8 19:52:05 GMT 1999
John Cowan writes:
> David Megginson wrote:
>
> > public abstract void setFeature (String featureID, boolean state)
> > throws SAXNotSupportedException;
>
> I want to propose a restriction and an extension:
>
> 1) This method cannot be called after any other parser method
> has been invoked.
Wouldn't it be better to allow the parser/filter make that decision?
If the user attempts to change something during a parse that should
*not* be changed during a parse, the parser/filter can throw a
SAXNotSupportedException.
> 2) This method is allowed to throw a SAXNewParserException, which
> encapsulates a replacement parser. The application should use
> the parser inside the exception in place of the original parser.
> This allows parsers to push filters on top of themselves, which
> complements the ability of applications to push them.
I think that this could be layered on top of SAX, simply by
subclassing SAXNotSupportedException.
All the best,
David
--
David Megginson david at megginson.com
http://www.megginson.com/
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