problem using xslt-process on using extension functions which make use of my own Java classes.

darren hu <darren-isqyP6E2kY//[email protected]> Sun, 26 Dec 2004 01:30:12 +0800
Newsgroups	gmane.emacs.xslt-process.general
Message-ID	<[email protected]>
hi all:
  I have setup xslt-process properly(I think) because I can apply 
,debug. it also works fine with the *xsl and *xml included in 
/xslt-process-2.2/samples and test. but when I use extension funtions 
which make use of my own java classes problems arise.
  I just used a example from xalan and the files related are listed 
below which one can find at this 
link:http://xml.apache.org/xalan-j/extensions.html#ex-java;

I have setup xslt-process-additional-classpath and

> xslt-process-additional-classpath's value is
> ("~/workspace/classes")

and MyCounter.class is in ~/workspace/classes.


when I C-c C-x v  xslt-erros  shows:

cd

/home/darren/workspace/test.xsl:16:28: Fatal error: MyCounter
For extension function, could not find method 
java.lang.String.read([ExpressionContext,] ).

 I
  	

MyCounter.java

		
	

Import java.util.*;

public class MyCounter {
  Hashtable counters = new Hashtable ();

  public MyCounter () 
  {}

  public void init
             ( org.apache.xalan.extensions.XSLProcessorContext context,
               org.apache.xalan.templates.ElemExtensionCall extElem ) 
  {
    String name = extElem.getAttribute("name");
    String value = extElem.getAttribute("value");
    int val;
    try 
    {
      val = Integer.parseInt (value);
    } 
    catch (NumberFormatException e) 
    {
      e.printStackTrace ();
      val = 0;
    }
    counters.put (name, new Integer (val));
  }

  public int read(String name) 
  {
    Integer cval = (Integer) counters.get (name);
    return (cval == null) ? 0 : cval.intValue ();
  }

  public void incr
             ( org.apache.xalan.extensions.XSLProcessorContext context,
               org.apache.xalan.templates.ElemExtensionCall extElem) 
  {
    String name = extElem.getAttribute("name");
    Integer cval = (Integer) counters.get(name);
    int nval = (cval == null) ? 0 : (cval.intValue () + 1);
    counters.put (name, new Integer (nval));
  }
}
            

	
		

An XML source document:

		
	

<?xml version="1.0"?>
<doc>
  <name first="David" last="Marston"/>
  <name first="David" last="Bertoni"/>
  <name first="Donald" last="Leslie"/>
  <name first="Emily" last="Farmer"/>
  <name first="Jack" last="Donohue"/>
  <name first="Myriam" last="Midy"/>
  <name first="Paul" last="Dick"/>
  <name first="Robert" last="Weir"/>
  <name first="Scott" last="Boag"/>
  <name first="Shane" last="Curcuru"/>
</doc>

	
		

The stylesheet:

		
	

<?xml version="1.0"?> 
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:xalan="http://xml.apache.org/xalan"
                xmlns:counter="MyCounter"
                extension-element-prefixes="counter"
                version="1.0">

  <xalan:component prefix="counter"
                   elements="init incr" functions="read">
    <xalan:script lang="javaclass" src="xalan://MyCounter"/>
  </xalan:component>

  <xsl:template match="/">
    <HTML>
      <H1>Names in alphabetical order</H1>
      <counter:init name="index" value="1"/>
      <xsl:for-each select="doc/name">
        <xsl:sort select="@last"/>
        <xsl:sort select="@first"/>
        <p>
        <xsl:text>[</xsl:text>
        <xsl:value-of select="counter:read('index')"/>
        <xsl:text>]. </xsl:text>
        <xsl:value-of select="@last"/>
        <xsl:text>, </xsl:text>
        <xsl:value-of select="@first"/>
        </p>
        <counter:incr name="index"/>
      </xsl:for-each>
    </HTML>
  </xsl:template>
 
</xsl:stylesheet>

	
		

Transformation output(expected result which I do not get):

		
	

<HTML>
<H1>Names in alphabetical order</H1>
<p>[1]. Bertoni, David</p>
<p>[2]. Boag, Scott</p>
<p>[3]. Curcuru, Shane</p>
<p>[4]. Dick, Paul</p>
<p>[5]. Donohue, Jack</p>
<p>[6]. Farmer, Emily</p>
<p>[7]. Leslie, Donald</p>
<p>[8]. Marston, David</p>
<p>[9]. Midy, Myriam</p>
<p>[10]. Weir, Robert</p>
</HTML>

	
		




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