Re: Cannot find extension function using 10.x

You're right, I missed that the stylesheet was still being read by the
old SAXTransformerFactory code and not the S9 API code...

On Fri, Aug 7, 2020 at 8:37 PM Michael Kay <[email protected]> wrote:
>
> The code you've shown us is fine, so there's something wrong in the code you haven't shown us...
>
> I ran this JUnit test based on your code, and it worked fine:
>
> public void testIntegratedExtensionFunctionXslt3() {
>     try {
>         Processor proc = new Processor(false);
>         proc.registerExtensionFunction(new ConstructDocument(proc));
>         XsltCompiler comp = proc.newXsltCompiler();
>         StringReader sr = new StringReader(
>                 "<xsl:stylesheet version='2.0' xmlns:xsl='http://www.w3.org/1999/XSL/Transform' xmlns:f='https://w3id.org/atomgraph/client#' xmlns:xs='http://www.w3.org/2001/XMLSchema'>" +
>                         "<xsl:template name='go'><a name=\"{f:construct-doc(xs:anyURI('http://a/'), xs:anyURI('http://b/'), xs:anyURI('http://c/'))/*/name()}\"/></xsl:template>" +
>                         "</xsl:stylesheet>");
>         XsltExecutable exec = comp.compile(new StreamSource(sr));
>         XsltTransformer xsl = exec.load();
>         xsl.setInitialTemplate(new QName("go"));
>         StringWriter sw = new StringWriter();
>         Serializer out = proc.newSerializer();
>         out.setOutputWriter(sw);
>         xsl.setDestination(out);
>         xsl.transform();
>         assertTrue("out", sw.toString().contains("doc52"));
>     } catch (Exception e) {
>         e.printStackTrace();
>         fail(e.getMessage());
>     }
> }
>
>
> public static class ConstructDocument implements ExtensionFunction {
>
>     private final Processor processor;
>
>     public ConstructDocument(Processor processor) {
>         this.processor = processor;
>     }
>
>     @Override
>     public QName getName() {
>         return new QName("https://w3id.org/atomgraph/client#", "construct-doc");
>     }
>
>     @Override
>     public SequenceType getResultType() {
>         return SequenceType.makeSequenceType(ItemType.DOCUMENT_NODE,
>                                              OccurrenceIndicator.ZERO_OR_MORE);
>     }
>
>     @Override
>     public SequenceType[] getArgumentTypes() {
>         return new SequenceType[]
>                 {
>                         SequenceType.makeSequenceType(ItemType.ANY_URI,
>                                                       OccurrenceIndicator.ONE),
>                         SequenceType.makeSequenceType(ItemType.ANY_URI,
>                                                       OccurrenceIndicator.ZERO_OR_MORE),
>                         SequenceType.makeSequenceType(ItemType.ANY_URI,
>                                                       OccurrenceIndicator.ONE),
>                 };
>     }
>
>     @Override
>     public XdmValue call(XdmValue[] arguments) throws SaxonApiException {
>         return processor.newDocumentBuilder().build(new StreamSource(new StringReader("<doc52/>")));
>     }
>
>     public Processor getProcessor() {
>         return processor;
>     }
>
> }
>
> It could be for example that you have more than one Processor and you've registered the function with the wrong one; or perhaps you only registered it after compiling the stylesheet (without seeing all your code I can't rule out these possibilities).
>
> If you still can't get it to work, please provide a complete repro so we can actually reproduce the problem.
>
> The configuration option Feature.TRACE_EXTERNAL_FUNCTIONS can be useful for diagnostics on this kind of problem.
>
> Michael Kay
> Saxonica
>
> On 7 Aug 2020, at 13:06, Martynas Jusevičius <[email protected]> wrote:
>
> Hi,
>
> I've been trying to upgrade to Saxon 10.x and had to implement a few
> (simple) extension functions in the process. I've been following this
> guide:
> https://www.saxonica.com/html/documentation/extensibility/integratedfunctions/ext-simple-J.html
>
> However I get this error message when attempting to use one of them:
>
> Error near {...c:forClass, $ldt:base)/rdf:...} at char 0 in
> xsl:apply-templates/@select on line 650 column 135 of layout.xsl:
>  XPST0017: Cannot find a 3-argument function named
>  Q{https://w3id.org/atomgraph/client#}construct-doc()
>
> I've double-checked the namespaces.
>
> The function is registered on the Processor:
>
>        processor.registerExtensionFunction(new ConstructDocument(processor));
>
> The function itself looks like this:
>
> public class ConstructDocument implements ExtensionFunction
> {
>
>    private final Processor processor;
>
>    public ConstructDocument(Processor processor)
>    {
>        this.processor = processor;
>    }
>
>    @Override
>    public QName getName()
>    {
>        return new QName("https://w3id.org/atomgraph/client#", "construct-doc");
>   }
>
>    @Override
>    public SequenceType getResultType()
>    {
>        return SequenceType.makeSequenceType(ItemType.DOCUMENT_NODE,
> OccurrenceIndicator.ZERO_OR_MORE);
>    }
>
>    @Override
>    public SequenceType[] getArgumentTypes()
>    {
>        return new SequenceType[]
>        {
>            SequenceType.makeSequenceType(ItemType.ANY_URI,
> OccurrenceIndicator.ONE),
>            SequenceType.makeSequenceType(ItemType.ANY_URI,
> OccurrenceIndicator.ZERO_OR_MORE),
>            SequenceType.makeSequenceType(ItemType.ANY_URI,
> OccurrenceIndicator.ONE),
>        };
>    }
>
>    @Override
>    public XdmValue call(XdmValue[] arguments) throws SaxonApiException
>    {
>        ...
>    }
>
>    public Processor getProcessor()
>    {
>        return processor;
>    }
>
> }
>
> What am I missing here? Thanks.
>
>
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