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RE: Converting Document object (DOM) into inputsource for XS

Subject: RE: Converting Document object (DOM) into inputsource for XSL process ing in XT
From: "Maxime Levesque" <maximel@xxxxxxxxxxxxxx>
Date: Fri, 27 Aug 1999 10:20:20 -0700
domsource to inputsource
 The better approach is to use John Cowan's DOMParser

 (http://www.ccil.org/~cowan/XML/) (* thanks for the link Michael)

  InputSource domSource = new org.ccil.cowan.sax.DOMSource(yourDocument);

  Parser inputParser = new org.ccil.cowan.sax.DOMParser();

  Parser sheetParser = "... your favorite XML parser ...";

  XSLProcessorImpl xt = new XSLProcessorImpl();

  xt.setParser(inputParser, sheetParser);


 This will avoid the unnecessary 'flattening' and parsing.

> Do you mean that for small document (less than 10Kb), it's faster to
> transform DOM into byte[] and then reparse it  ? Did I understand
> well?

  Flattening the DOM tree onto byte[]s and reparsing it will always
be costly, what Dan was suggesting was to 'pipe' :

 (1)  DOM -> DOMWriter -> InputStreamWriter -> PipedOutputStream ->
PipedInputStream -> SAXParser

instead of  :


  flattening :

  DOM -> DOMWriter -> InputStreamWriter -> byte[]

  and then inflating :

  byte[] -> ByteArrayInputStream -> SAXParser

  in two separate steps.

 (1) has the advantage of being memory efficient (the memory usage is the
     of the PipedInputStream's buffer).

  The overhead of (1) is that there is a that the threads are 'waiting' and
  a lot, but for big enough documents (2) will bust your memory.

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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