Berin Loritsch wrote:
I have a Java object I am using to generate links. It would make my
life easier if I could use it directly in my XSLT--even though it is
created outside of the XSLT system. Is it as easy as passing it in as a
parameter? Or is there some extra leg work necessary?
It's not *that* easy, but Xalan offers various extension mechanism for
your XSLT (sometimes you have no other choice... apart waiting for XSLT
2.0, of course).
Here's an example using Java [1]:
The Java class:
---------------
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));
}
}
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>
Regards,
[1] http://xml.apache.org/xalan-j/extensions.html#ex-java
--------------------
Luca Morandini
www.lucamorandini.it
--------------------
