Java Integration (Java Language Binding) 

Use

Allows method invocation upon existing Java classes and objects (that is invocation of static and instance methods) and object creation (constructor invocation) upon existing classes.

To implement an extension function in Java, stylesheet developers associate an implementation to their extension function namespace prefix using an xsl:script element with language=”java” as in the following example:

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
xmlns:date="uri.any">

<xsl:script implements-prefix="date" language="java"
src="java:com.example.datestuff.DateRoutines"/>

<xsl:template match="/">
<OrderDate>
<xsl:value-of select="date:format(/order/date,'MM/DD/YY')"/>
</OrderDate>
</xsl:template>
</xsl:stylesheet>

For Java, the value of the srcattribute on xsl:script is a URI reference identifying a Java class. The methods of this class implement the functions, which expanded names, have the namespace URI specified by the implements-prefix attribute. The URI specified by the src attribute may use the java: URI scheme: src="java:fully.qualified.ClassName"; the XSLT processor may also allow the URI to use other URI schemes to locate a resource containing the Java class file.

Here is an example XSL document that uses Java Language Binding:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   xmlns:myobj="com.sap.engine.lib.xml.parser.Myobj">

<xsl:param name="myobj"/>

<xsl:template match = "/">
   At this moment:<xsl:value-of select="string(myobj:getToday())"/>
   we offer:
   <xsl:apply-templates/>
  
   <xsl:value-of select="myobj:callNodeList($myobj, /)"/>
 
</xsl:template>
</xsl:stylesheet>

Applying the latter to the following XML document:

<?xml version="1.0"?>
<grocery name = "The red tomato">
  <fruit>
    <article> Apples</article>
     <article> Pears </article>
     <article> Bananas </article>
  </fruit>
  <vegetables>
    <article>Cucumbers </article>
    <article> Tomatoes </article>
     <article>  Peppers </article>
  </vegetables>
  </grocery>

Results in:

<?xml version='1.0' encoding='utf-8'?>
   At this moment:Wed Oct 17 17:48:53 EEST 2001
   we offer:
   
    Apples
   
    Pears
  
    Bananas

    Cucumbers

    Tomatoes
  
     Peppers

In order to run this example, a parameter should be added to the transformer, prior to transformation in the following way:

Myobj my = new Myobj();
transformer.setParameter("myobj", my);

Where the class definition of the class Myobjlooks like:

import org.w3c.dom.*;

public class Myobj {
   
  public void callNodeList(Node n) {
    System.out.println(n);   
  }

  public static java.util.Date getToday() {
    java.util.Calendar cal =
    ava.util.Calendar.getInstance();
    return cal.getTime();
   
  }
 
}