SAX: towards a solution
ak117 at freenet.carleton.ca
Sun Jan 4 01:03:33 GMT 1998
James Clark writes:
> I don't think using java.util.Dictionary is a good idea:
> 1. JDK 1.2 provides a new Map interface which replaces Dictionary.
> 2. java.util.Dictionary is an abstract base class not an interface.
> 3. java.util.dictionary is weakly typed: it doesn't enforce the
> requirement that keys be strings, and it requires values to be cast to
> I think it would be much better to have an Attributes interface and also
> a convenience adapter class that provides a Dictionary implementation in
> terms of that interface.
I would like to avoid java.util.Map to keep SAX applet-friendly (it
will be years before most browsers deployed support even 1.1). I
agree that Dictionary is far less than ideal -- what do you imagine
the attributes interface looking like?
> > charData (char ch, int length)
> I think there should be an offset argument as well. Most of the Java
> String operations that operate on a subarray take 3 arguments: char
> array, offset and count.
Agreed. I will change it to
charData (char ch, int start, int length);
> > I am also assuming that we will provide not only a callback interface,
> > but also an (optional) base class with stub methods that implementors
> > can override as needed; that means that novice users will not have to
> > implement all of SAX, even if we do end up with nine or ten methods.
> I agree we should provide these. JDK 1.1 does this extensively in AWT:
> it calls the base classes Adapters. I think we should follow this
Will the terminology translate well to other OO languages? If so,
then I will be happy to use it.
All the best, and thank you for the comments,
David Megginson ak117 at freenet.carleton.ca
Microstar Software Ltd. dmeggins at microstar.com
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