RE: [xsl] How to retrieve global parameters names and their default values using Saxon?

["Michael Kay" <mike@xxxxxxxxxxxx>]

This conversation would be better conducted on the Saxon list...

You could pick up all constant expressions, of whatever type, using the test

if X instanceof Value
  return ((Value)X).getStringValue()

Note that if the expression is written as select="2+2", you will probably
get back the pre-evaluated result, "4".

You could pick up the special case of

<xsl:param>xyz</xsl:param>

using

if X instanceof TextFragmentValue
  return ((TextFragmentValue)X).getStringValue()

Michael Kay
http://www.saxonica.com/
 

> -----Original Message-----
> From: Abel Braaksma Online [mailto:abel.online@xxxxxxxxx] 
> Sent: 10 May 2006 14:37
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [xsl] How to retrieve global parameters names 
> and their default values using Saxon?
> 
> A follow up after some testing and trial and error. The 
> proposed solution works partially, thanks again for this 
> pointer, but we get (indeed Michael, you were right) strange 
> results for any <xsl:param> value that is not a quoted literal. So:
> 
> A. <xsl:param name="somenameA" select=" 'literal-string-A' " 
> /> B. <xsl:param name="somenameB" >literal-string-B</xsl:param>
> 
> (A) correctly returns "literal-string-A" (incl. quotes)
> (B) (in?) correctly returns 
> "net.sf.saxon.instruct.DocumentInstr@d1a34a" 
> (without quotes)
> 
> We have tried evaluateAsString (Expression and ComputedExpression
> classes) and some other things, basically all requiring an 
> XPathContext, and setting context to null did not help, 
> although the docs hint as if it should.
> 
> My guess is that the XSLT processor sees the content of (B) 
> as a node set, containing one node, namely a text node. I 
> wonder, is there a way of doing something like:
> 
> rootContext = compiledStylesheet.getRootContext();
> if(ParamB.canEvaluateToString())
>       return ParamB.evaluateToString(rootContext);
> else
>       return null;
> 
> So: I would like to know a way to get the normalized string 
> representation, unless the xsl:param is a node set (other 
> than a single text node) or an xpath instruction.
> 
> Any help on this follow up is greatly appreciated.
> 
> Cheers,
> Abel
> 
> 
> 
> andrew welch wrote:
> 
> >
> > compiledStylesheet = stf.newTemplates(new 
> > StreamSource(stylesheetPath));   
> >  Executable exec =
> > ((PreparedStylesheet)compiledStylesheet).getExecutable();
> >  IntHashMap map = exec.getCompiledGlobalVariables();
> >  Iterator iter = map.valueIterator();
> >  while (iter.hasNext()) {
> >    Object var = iter.next();
> >    if (var instanceof GlobalParam) {
> >      String name = ((GlobalParam)var).getVariableName();
> >      String value = 
> > ((GlobalParam)var).getSelectExpression().toString();
> >
> > cheers
> > andrew