XOM API for Processing XML with Java

[Elliotte Harold <elharo AT metalab.unc.edu>]

Wolfgang Hoschek wrote:


> 3) Verifier.checkPCDATA
>
> FYI, there are still Unicode calculations (multiplications, etc) in 
> decodeSurrogatePair that are entirely unnecessary. Actually the entire 
> method is unnecessary. My fastest version is as follows (retaining 
> semantics unchanged):

I see what you're getting at here, but I find it really hard to believe 
decodeSurrogatePair has any practical impact. This is only going to come 
up if the text contains characters from beyond the basic multilingual 
plane. Does Lawrence Berkeley Labs really do that much processing on 
Tengwar and Cirth? :-)

I suspect the speed-ups you see here are based on using charAt instead 
of toCharArray, not eliminating the extra operations in 
decodeSurrogatePair. This is the sort of thing that is very VM specific, 
and perhaps even document specific. The reason I'm using toCharArray 
here is that in my tests on both Linux and Mac OS X this was faster. I 
can easily believe this could have turned around again in Java 1.5 or 
some other variation.

--
Elliotte Rusty Harold  elharo AT metalab.unc.edu
XML in a Nutshell 3rd Edition Just Published!
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