RE: [xml-dev] Serialization with SAX

["Michael Kay" <mike@saxonica.com>]

You don't want to get the source of a serializer and modify it. You want to
add a SAX filter into a pipeline. Your filter should simply call the next
stage in the pipeline (that is, the serializer) for every event until the
threshold is reached, and do nothing for events after that threshold (except
of course for closing the outermost element and the document tidily).

You can write a SAX filter by subclassing XMLFilterImpl, and you can see how
to use it from a tutorial at
http://www.cafeconleche.org/slides/sd2000east/sax/74.html 

> -----Original Message-----
> From: Johannes Lichtenberger 
> [mailto:Johannes.Lichtenberger@uni-konstanz.de] 
> Sent: 15 January 2009 21:30
> To: xml-dev@lists.xml.org
> Subject: [xml-dev] Serialization with SAX
> 
> Hello,
> 
> I want to be able to serialize an input XML document to an 
> output document. It seems to be stupid, but I want to read 
> until the say 2000th page-element and then skip everything. 
> It seems I can serialize it with something like
> 
> SAXTransformerFactory fac = 
> (SAXTransformerFactory)TransformerFactory.newInstance();
> handler = fac.newTransformerHandler();
> Transformer t = handler.getTransformer(); 
> t.setOutputProperty(OutputKeys.METHOD, "xml"); 
> t.setOutputProperty(OutputKeys.INDENT, "yes"); 
> handler.setResult(new StreamResult(new FileOutputStream(filename)));
> 
> Now I'm not sure how to implement something like a check 
> against a counter within every callback-method. Something like
> 
> private long counter = 0;
> 
> /**
>  * {@inheritdoc}
>  */
> public void startElement(String namespaceURI, String 
> localName, String qName,
>       Attributes atts) throws SAXException {
>  
>   if (localName.equalsIgnoreCase("page")) {
>     counter++;
>   }
>     
>   if (counter < ARTICLES) {
>     // TODO: everything which really has to be done to 
> serialize the doc.
>   }
> }
> 
> I'm not sure where to get the source for a full serialization 
> implemention and add "if (counter < ARTICLES) {" to every 
> method. Or simply how to add such a check ;-) I simply want 
> to have 2000 pages (page-Elements with all descendants) in 
> the output and then skip everything else.
> 
> greetings,
> Johannes
> 
> 
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