[xsl] How to call an external Java function

["Ylvisaker, Steve" <steve.j.ylvisaker@xxxxxxxxxxxxx>]

I have a working Java function that uses FontMetrics to determine the length
in points of a given character stream. I am able to call the function from the
windows command line and it runs just as I expect. Now I  want to call that
same function from my XSL stylesheet and I can't seem to get the correct
incantation.

I have set my classpath environment variable to include the path:
c:\maps-jars\FontWidth.jar

I have placed FontWidth.jar in folder c:\maps-jars

FontWidth is the Java class.

And I have run the following simple transformation with Saxon8:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet  version="2.0"
    xmlns:axf="http://www.antennahouse.com/names/XSL/Extensions";
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
    xmlns:med="java:FontWidth"
    extension-element-prefixes="med">

    <xsl:template match="/">

        <xsl:variable name="testJava">
            <xsl:value-of select="med:labelStringWidth('Helvetica World', 12,
'This is test text')"/>
        </xsl:variable>

        <xsl:message>result:<xsl:value-of select="$testJava"/></xsl:message>

    </xsl:template>

</xsl:stylesheet>

labelStringWidth is a method belonging to class FontWidth.

I have run this under <oxygen/> and stand alone from the command line with
Saxon8 and in both situations I receive the following error message:

Description: XPath syntax error at char 64 on line 11 in {...rld', 12, 'This
is test tex...}: Cannot find a matching 3-argument function named
{java:FontWidth}labelStringWidth()

Any help I can get on this would be very much appreciated.
Steve


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