XSLTC extension function capabilities?

[Brian Hilst <br...@rainwave.com>]

I am attempting to convert some Xalan extension functions to work with
XSLTC.  I need the following functionality and wonder if someone can tell me
if it is possible.

1.  Pass an org.w3c.dom.NodeList param to an extension functions
2.  Conduct XPath queries within the extension function and return a
NodeList
3.  Call a non-static method on an object passed into the transformation as
a parameter

I tested NodeList params (#1 above), but get errors from the XSLTC compiler:

	Unable to resolve call to function 'http://xml.apache.org/xslt/java:eval'

The function is declared as follows:

	public static String eval(org.w3c.dom.NodeList nodeList, String pattern)

It works with methods that don't have NodeList params, so I know I've got
everything declared correctly.

I noticed in FunctionCall.java, there are mappings declared from internal to
org.w3c.dom.NodeList.  However, when it is trying to resolve the function
mapping the internal param is of ReferenceType and this doesn't map to
anything.

...Brian

Re: XSLTC extension function capabilities?

[Tom Amiro <To...@Sun.COM>]

Hi Brian,

I'll respond based on Sanitago's assessment. (He's having trouble 
getting mail on the xalan-dev alias).

#1 This seems like a reasonable enhancement. Would you file an 
   enhancement request in Bugzilla.

#2 This is not really doable giving the compile/runtime architecture
   of XSLTC.

#3 This is already supported for nonstatic external Java functions.
   There a few ways to call such a function. For example:

<xsl:stylesheet
        version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:xalan-java="http://xml.apache.org/xslt/java"
        xmlns:java="http://xml.apache.org/xslt/java"
        xmlns:xsltc-java="http://xml.apache.org/xalan/xsltc/java"
        xmlns:xalan-java-math="http://xml.apache.org/xslt/java/java.lang.Math"
        xmlns:xsltc-java-math="http://xml.apache.org/xalan/xsltc/java/java.lang.Math">

<xsl:template match="/">
    <xsl:value-of select="xalan-java:java.lang.Math.sin(1.2)"/>
    <xsl:value-of select="java:java.lang.Math.sin(1.2)"/>
    <xsl:value-of select="xsltc-java:java.lang.Math.sin(1.2)"/>
    <xsl:value-of select="xalan-java-math:sin(1.2)"/>
    <xsl:value-of select="xsltc-java-math:sin(1.2)"/>
    <!-- This instruction reports a warning at compile time
        <xsl:value-of select="xalan-java:nodeset()"/> 
    -->
</xsl:template>

</xsl:stylesheet>


Brian Hilst wrote:
> 
> I am attempting to convert some Xalan extension functions to work with
> XSLTC.  I need the following functionality and wonder if someone can tell me
> if it is possible.
> 
> 1.  Pass an org.w3c.dom.NodeList param to an extension functions
> 2.  Conduct XPath queries within the extension function and return a
> NodeList
> 3.  Call a non-static method on an object passed into the transformation as
> a parameter
> 
> I tested NodeList params (#1 above), but get errors from the XSLTC compiler:
> 
>         Unable to resolve call to function 'http://xml.apache.org/xslt/java:eval'
> 
> The function is declared as follows:
> 
>         public static String eval(org.w3c.dom.NodeList nodeList, String pattern)
> 
> It works with methods that don't have NodeList params, so I know I've got
> everything declared correctly.
> 
> I noticed in FunctionCall.java, there are mappings declared from internal to
> org.w3c.dom.NodeList.  However, when it is trying to resolve the function
> mapping the internal param is of ReferenceType and this doesn't map to
> anything.
> 
> ...Brian

-- 
 Tom Amiro -- SQA Engineer
 Sun XML Technology Development
 voice: 781-442-0589 Fax: 781-442-1437
 eMail: tom.amiro@.sun.com