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RE: [xsl] Calling a Java extension from XSLT using Saxon B

2009-06-23 17:58:28

It's always useful to use the -TJ option when debugging this kind of
problem.

I think your problem is that you used the -jar option on the command line.
This causes the classpath to be ignored. You need to use the

java -cp ... net.sf.saxon.Transform

way of invoking the transformation.

I'm afraid this is an elephant trap that many people fall into. However
prominently I put the warnings in the documentation, they still fall in.

Incidentally, questions about specific XSLT products are best asked on a
product specific list. For Saxon that's the saxon-help list which you can
find via the saxon project on SourceForge.

Regards,

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

-----Original Message-----
From: Blaine McNutt (rbmcnutt) [mailto:rbmcnutt(_at_)cisco(_dot_)com] 
Sent: 23 June 2009 20:20
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Calling a Java extension from XSLT using Saxon B

I am not a Java programmer, but I would like to use an 
extension to check for the existence of an image file 
referenced by an XML file (as I believe that is the only way 
to check for the existence of a non-XML file). This topic has 
been discussed a lot on various aliases, and despite my best 
efforts, I'm unable to unravel the mystery.  

I've included what I believe to be relevant information.

Error Message:
--------------
Error at xsl:value-of on line 15 column 48 of 
nxs-test-image-exists.xsl:
  XPST0017: XPath syntax error at char 20 on line 15 in 
{nxs:fileExist(@osrc)}:
    Cannot find a matching 1-argument function named 
{java:FileExist}fileExist() Failed to compile stylesheet. 1 
error detected.

Saxon-B 9.1.7 J stored in xmlsrc/xTools/saxon9.
-----------------------------------------------

Java program (compiled and the FileExist.class file stored in 
xmlsrc/xTools/saxon9/classes)

/* Source: 
http://p2p.wrox.com/xslt/71563-xslt-check-if-directory-exist.html */

import java.io.File;

public class FileExist {

    private static boolean exist;

    public static boolean fileExist(String myfile) {

        exist = new File(myfile).exists();

        return exist;

    }
}

XML Snippet for img element
---------------------------

...
<img osrc="../../images/1982.jpg" />

...

XSLT
------

<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet version="2.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:nxs="java:FileExist">

<xsl:output method="xml"/>

<xsl:template match="/">
                <xsl:apply-templates /> </xsl:template>

<xsl:template match="img">
                <xsl:value-of select="nxs:fileExist(@osrc)" 
/> </xsl:template>
     
</xsl:stylesheet>

Korn Shell script/command line call:
------------------------------------

# define saxon command line
saxon="java -classpath xTools/saxon9/classes; -jar -Xmx1G 
xTools/saxon9/saxon9.jar -tree:tiny -dtd:off -ext:on "
# call transform
$saxon deliverables/help/helpFile.xml  
xslt/nxs-test-image-exists.xsl > imageerror.xml


Thank you for any insights you might offer.

Blaine

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