On Fri, 2003-06-20 at 12:22, Schwartz, Rechell R, ALABS wrote:
How do I tranform the document using SAX-- i.e., how do I change this
line?
transformer.transform(new DOMSource(document), new StreamResult(out));
This is kind of more a java question than an XSLT question. Here is a
snip-it that I use in one of my programs - it's a touch kludgey but if
you know java you can decipher the needed parts - if you can't I
recommend "Java & XML" second edition by Brett McLaughlin from O'Reilly
public long transform(java.io.InputStream xmlin, java.io.InputStream
xslin, java.io.OutputStream output, java.io.File xslURI, java.io.File
xmlURI) throws Exception {
strResult = null;
if(params == null)
params = new Vector();
String media = null;
//set the factory to the specified one
System.setProperty("javax.xml.transform.TransformerFactory",
XSLTFactory);
//get an instance and make a result object
tfactory = javax.xml.transform.TransformerFactory.newInstance();
strResult = new javax.xml.transform.stream.StreamResult(output);
stf = (javax.xml.transform.sax.SAXTransformerFactory) tfactory;
StreamSource ss = new StreamSource(xslin);
if(xslURI != null) ss.setSystemId(xslURI);
stylesheet = tfactory.newTemplates(ss);
transformer = stylesheet.newTransformer();
//set params
for(int i=0; i < params.size()-1; i++)
transformer.setParameter((String) params.elementAt(i),
(String)params.elementAt(i+1));
//do the transformation
StreamSource input = new StreamSource(xmlin);
if(xmlURI != null) input.setSystemId(xmlURI);
transformer.transform(input, strResult);
....
Rechell Schwartz
-----Original Message-----
From: J.Pietschmann [mailto:j3322ptm(_at_)yahoo(_dot_)de]
Sent: Friday, June 20, 2003 3:13 PM
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] Optimizing Trax
Schwartz, Rechell R, ALABS wrote:
I am using Trax to transform my xml files, and am finding the
performance
very slow especially for large files. Are there any ways of optimizing
the
performance such as by pre-compiling the stylesheets?
Yes, but your time is probably wasted elsewhere.
> transformer = tFactory.newTransformer(new
StreamSource(getClass().getResourceAsStream(xsl)));
> transformer.transform(new DOMSource(document), new
StreamResult(out));
^^^^^^^^^^^^^^^^
Use a profiler to check where your program wastes time:
- DB access or whereever you get your raw data
- DOM construction
- transformation
If it is the latter, check your XSL for inefficient constructs.
If it is DOM construction, use SAX. Also DOM uses a lot of memory,
which may be a problem in itself (more GC).
J.Pietschmann
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