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   RE: Possible parse() overloading bug in XMLFilterImpl

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  • From: Miles Sabin <msabin@cromwellmedia.co.uk>
  • To: Elliotte Rusty Harold <elharo@metalab.unc.edu>, xml-dev@xml.org
  • Date: Thu, 9 Mar 2000 15:59:17 -0000

Elliotte Rusty Harold wrote,
> What I suspect it should do is:
>     public void parse (String systemId)
>         throws SAXException, IOException
>     {
>         parse(new InputSource(systemId));
>     }
> No similar constraint is given in the Java docs for
> XMLFilterImpl, which does not implement XMLReader, so maybe 
> there's a reason for these two to behave differently. But it 
> seems suspicious to me. Since XMLFilterImpl implements 
> XMLFilter which extends XMLReader, I'd expect the constraints 
> to inherit through.

No doubt about it: you're right, it's a bug and your solution
is the right one.

The XMLReader interface made a behavioural contract, and all 
it's implementers, XMLFilterImpl included must honour it, on 
pain of violating the Liskov Substitution Princlple (qv).



Miles Sabin                       Cromwell Media
Internet Systems Architect        5/6 Glenthorne Mews
+44 (0)20 8817 4030               London, W6 0LJ, England
msabin@cromwellmedia.com          http://www.cromwellmedia.com/

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