Hi,
I'm trying to pre-process an XSL stylesheet with another stylesheet,
before using the result to transform an XML document. i.e.:
stylesheet(xsl) --> preprocessor(xsl) --> temp(xsl)
input(xml) --> temp(xsl) --> output(xml)
but I'm getting an error when I try. I'm not 100% sure exactly what
is going on here, so if someone could help I'd be grateful.
I've been working through the Xalan examples, and so
far have the following:
File input = new File("input.xml");
File stylesheet = new File("stylesheet.xsl");
File preprocessor = new File("preprocess.xsl");
SAXTransformerFactory stf =
(SAXTransformerFactory)TransformerFactory.newInstance();
// parse preprocessor stylesheet into templates handler
TemplatesHandler tmpltHand = stf.newTemplatesHandler();
XMLReader reader = XMLReaderFactory.createXMLReader();
reader.setContentHandler(tmpltHand);
reader.parse(new InputSource(new FileInputStream(preprocessor)));
// create transformer handler based on templates handler
Templates templates = tmpltHand.getTemplates();
TransformerHandler transHand =
stf.newTransformerHandler(templates);
// parse page stylesheet through proprocessor
reader.setContentHandler(transHand);
reader.setProperty("http://xml.org/sax/properties/lexical-handler";,
transHand);
transHand.setResult(new StreamResult(System.out));
reader.parse(new InputSource(new FileInputStream(stylesheet)));
This all works fine, and displays the modified stylesheet. It's when I
try to use this stylesheet it all goes wrong. I thought I could just
redirect the output of the last stage, via a SAXResult. into a new
TemplatesContentHandler, and then use this to transform the actual
input.
replace:
transHand.setResult(new StreamResult(System.out));
with:
TemplatesHandler tmpltHand2 = stf.newTemplatesHandler();
transHand.setResult(new SAXResult(tmpltHand2));
However, when I run this I get a NullPointerException in
TransformerHandlerImpl.endDocument.
Can anybody see what is wrong here, or suggest a better way of doing
this?
Cheers,
Barney
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