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   Re: Announcement: SAX2 1999-06-01 alpha release for Java

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Wed, 02 Jun 1999 11:38:56 -0400

David Megginson wrote:

> 1. Do we need a filter *interface* at all, or can a filter just be a
>    class that happens to implement Parser, Configurable,
>    EntityResolver, DTDHandler, DocumentHandler, and ErrorHandler?

Actually, a parser filter only *has* to implement Parser.  Whether
it implements the other things, or delegates their implementation
to private objects, is a detail.

>  (In
>    other words, is it enough to set the parent parser/filter in the
>    constructor?)

IMHO yes.  One could use reflection to determine whether there is
such a constructor, at least in the Java domain.
> 2. Actually, just last night I wrote an
>    org.xml.sax.helpers.FilterAdapter base class that filters can
>    easily be derived from (though they wouldn't have to be); by
>    default, it just lets all events sink down to the application,
>    and all configuration bubble up to the parser, but subclasses can
>    simply override methods to make changes in either direction.

I suggest you look at my P.D. code at
http://www.ccil.org/~cowan/XML/ParserFilter.java; it would be easy to
enhance it for SAX2, and it handles some subtle points.

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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