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From: James Clark <jjc@j...>
>> Parser filters are
>> just parsers that have a "parser(Parser)" constructor.
>
>This makes a lot of sense to me.
>
>With the setParent(Parser parser) idea, what's a filter supposed to do
>if the app fails to call setParent()? A filter has to have a parent
>Parser. Your suggestion captures this nicely.
Its a problem for MDSAX, which constructs ParserFilters in the other direction,
Sink to Source, rather than Source to Sink.
On the other hand, as long as a ParserFilter can be constructed with a
null Parser, it can be subclassed to subsequently set the parent.
The interface MDSAX in now using is
public interface MDFilter
extends Parser, DocumentHandler, DTDHandler, EntityResolver, ErrorHandler
{
public void
setParser(Parser eventSource);
}
All of the filters in MDSAX subclass org.ccil.cowan.sax.ParserFilter,
but depend on being able to pass a null Parser parameter in the constructor.
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