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Re: ModSAX (SAX 1.1) Proposal

From: James Clark <jjc@------.--->
To: xml-dev@--.--.--
Date: 2/23/1999 5:36:00 AM
Don Park wrote:

> >parser.setHandler("org.xml.sax.namespace", nsHandler);
> >
> >Now the handler org.xml.sax.namespace will need to be of some specific
> >type, org.xml.sax.NamespaceHandler, say.  What needs to be checked is
> >that nsHandler is of type org.xml.sax.NamespaceHandler.  Using
> >ModHandler doesn't do that.
> 
> It does if org.xml.sax.NamespaceHandler implements ModHandler.
> 
> public class NamespaceHandler implements ModHandler {}
> 
> ModParser parser;
> try
> {
>     parser.setHandler("org.xml.sax.namespace", new NamespaceHandler());
> }
> catch (Exception ex)
> {}

My point is it doesn't stop you doing:

public class PingHandler implements ModHandler { }

ModParser parser;

parser.setHandler("org.xml.sax.namespace", new PingHandler());

Declaring the second argument to be of type ModHandler doesn't ensure
that it is of the correct type.  It's not type-safe.

James



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