[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: multiple handlers
David Megginson wrote: > Michael Kay writes: > > > >In a private message, one SAX user raised the issue again of multiple > > >handlers > > >Any further thoughts on this issue? > > > > > I've implemented a layer on top of SAX that provides not only multiple > > handlers, but also per-element-type handlers. Since it is trivial to > > implement this on top of SAX, I suggest it shouldn't go into SAX itself. > > I had this same thought when I was walking my girls to school after > lunch. Unlike a GUI, which spends most of its time waiting for the > user to do something interesting, an XML parser has to deal with > hundreds or thousands of events each second, and perhaps millions of > events in a hefty XML document. > > Upon reflection, I am becoming more inclined to agree with the > arguments that people made in the first round, that the overhead of > walking through a vector of handlers and delivering each event to each > one can be excessive. Besides, as Michael rightly points out, > implementing a multi-listener interface on top of SAX is trivial if > you really need it. You don't need to actually use a Vector, but you could instead use an array or just a single object if the Vector was of length one. You may initially use a Vector to store your the handlers, but when you are about to parse you could just turn this into an array of handlers or else just a single handler. There are a lot of ways to go about this so any performance loss would be a function of how many handlers you are using. Nevertheless, SAX could just have a standard MulticastHandler implementation that dispatches events to multiple handlers. I think it would be useful to include in the Java SAX distribution a generic class to do this sort of thing. Tyler 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/ 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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