RE: [xsl] Saxon custom extensions problem

["Michael Kay" <mhkay at iclway dot co dot uk>]

The most likely explanation is that the ReverseString class is not on the
classpath.

Mike Kay

> -----Original Message-----
> From: owner-xsl-list@lists.mulberrytech.com
> [mailto:owner-xsl-list@lists.mulberrytech.com]On Behalf Of Gustaf
> Liljegren
> Sent: 16 October 2001 11:14
> To: XSL List
> Subject: [xsl] Saxon custom extensions problem
>
>
> Finally upgraded to Saxon 6.4.3. :-)
>
> Now I have some questions on the documentation for custom
> extensions to
> Saxon, namely the extensibility.html document:
>
>  'With the short-cut technique, the URI for the namespace identifies
>   the class where the external function will be found. The namespace
>   URI must either be "java:" followed by the fully-qualified class
>   name (for example xmlns:date="java:java.util.Date"), [...] The class
>   must be on the classpath.'
>
> Okay, here's my custom Java extension function:
>
> class ReverseString {
>   public static String reverseIt(String source) {
>     int i, len = source.length();
>     StringBuffer dest = new StringBuffer(len);
>     for (i = (len - 1); i >= 0; i--) {
>       dest.append(source.charAt(i));
>     }
>     return dest.toString();
>   }
> }
>
> I can take Java syntax, but I'm not so familiar with terminology like
> "fully-qualified class name". I have no class library, just a single
> function, and in the same directory as the stylesheet. So if
> I want to use
> it as an extension for an FO transformation, I guess I should write:
>
> <?xml version="1.0" encoding="iso-8859-1"?>
> <xsl:stylesheet version="1.0"
>   xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
>   xmlns:fo="http://www.w3.org/1999/XSL/Format";
>   xmlns:my="java:ReverseString">
>
> And later on, I use it like this:
>
> <xsl:value-of select="my:reverseIt(.)"/>
>
> Something is clearly wrong, and it seems to happen at the namespace
> declaration already:
>
>   The URI java:ReverseString does not identify an external Java class
> Transformation failed: run-time errors were reported
>
> For the future, it would be helpful to include two tiny (but complete)
> examples in the documentation: one for importing, and another
> for exporting
> content from the stylesheet to a Java application.
>
> Gustaf Liljegren
>
>
>
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>


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