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----- Original Message ----- From: David Megginson <david@m...> To: John Wilson <tug@w...> Cc: XML Developers' List <xml-dev@i...> Sent: 09 March 1999 17:19 Subject: Re: SAX: ModSAX addition, general property query >John Wilson writes: > > > I don't think that it's unreasonable to insist that objects representing a > > Feature, Handler or Property should either implement a distinct interface or > > subclass a distinct class. If this is so the Parser can tell what Feature, > > Handler or Property is being set by enquiring of the type of the object. (I > > favour insisting that they subclass distinct classes because (in Java) that > > naturally imposes the restriction that a single object can only represent a > > single Property.) > >We wouldn't want to have to rely on discovering the class at runtime, >so we'd have to have a method in the interface that reports a string >ID anyway -- at lot more work for the same result. Testing the type at run time is a tivial operation in Java so I'm not sure why you say that we wouldn't want to rely on descovering the class at run time. If there was some worry about the performance hit on iterating through all the supported interfaces (which I strongly doubt) the interface would have a method that reported a Class rather than a String. However, Glen Vanderburg has suggested an amendment to my idea which seems to me to address you concerns. John Wilson The Wilson Partnership 5 Market Hill, Whitchurch, Aylesbury, Bucks HP22 4JB, UK +44 1296 641072, +44 976 611010(mobile), +44 1296 641874(fax) Mailto: tug@w... xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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