xalan with pull parser 2007-03-16 - By Santiago Pericas-Geertsen
On Mar 16, 2007, at 1:54 PM, Eric J. Schwarzenbach wrote:
>
> Santiago Pericas-Geertsen wrote:
>> JAXP 1.4/JDK 6.0 has a new package called javax.xml.transform.stax,
>> in which you'll find a StAXSource class [1]. Note that internally
>> Xalan/XSLTC build a document model (DTM) from SAX events, so
>> there's a
>> StAX -> SAX conversion when starting from a StAXSource. Thus,
>> depending on the parsers in question, there may be no performance
>> advantage in using a StAXSource.
> FWIW, last time I tried (maybe six months ago, maybe 1 or 2
> versions of
> Xerces ago), I found absolutely no performance advantage to
> performing a
> transform from a SAX source over doing so from a stream source.
I wouldn't expect a different in that case, unless the SAXSource is
constructed from an XMLReader that has some performance advantage
over the one used by Xalan. When you pass a StreamSource, the XSLT
engine creates an XMLReader for it, so in essence this is similar to
a SAXSource.
When passing a SAXSource, however, you may have control over which
XMLReader to use. So, as I said above, you could pass an instance of
an XMLReader that is faster than the one used internally by Xalan
(i.e., typically Xerces).
-- Santiago
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