XSL (Extensible Stylesheet Language) - Implementation in JDK

<< XSL (Extensible Stylesheet Language)

<< JDK (Java Development Kit) Tutorials

This section provides a tutorial example on how to write a simple program, XSLClassChecker.java, to view implementation classes of XSL (Extensible Stylesheet Language) in JDK.

JDK (J2SDK) 1.4.1_01 offers the following interfaces to support XSL (Extensible Stylesheet Language):

• javax.xml.transform.TransformerFactory: The transformer factory class to help to create a transformer object.
• javax.xml.transform.Transformer: The abstract class representing a transformer.
• javax.xml.transform.Source: The interface representing source objects for the transformer to process.
• javax.xml.transform.Result: The interface representing result objects produced by the transformer.

One thing is missing here: who represents the transformation style rules? The answer is that javax.xml.transform.Source also represents transformation style rules, because they written in XML.

I have a simple program here, XSLClassChecker.java, to show what are the XSL implementation classes:

/**
 * XSLClassChecker.java
 * Copyright (c) 2002 by Dr. Herong Yang
 */
import javax.xml.transform.Source;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.stream.StreamSource;
import javax.xml.transform.stream.StreamResult;
class XSLClassChecker {
   public static void main(String[] args) {
      try {
         TransformerFactory f = TransformerFactory.newInstance();
         System.out.println(f.toString());
         Transformer t = f.newTransformer();
         System.out.println(t.toString());
         Source s = new StreamSource();
         System.out.println(s.toString());
         Result r = new StreamResult();
         System.out.println(r.toString());
         t.transform(s,r);
      } catch (TransformerConfigurationException e) {
         System.out.println(e.toString()); 	
      } catch (TransformerException e) {
         System.out.println(e.toString()); 	
      }
   }
}

Output:

org.apache.xalan.processor.TransformerFactoryImpl@119298d
org.apache.xalan.transformer.TransformerIdentityImpl@1f33675
javax.xml.transform.stream.StreamSource@1690726
javax.xml.transform.stream.StreamResult@9931f5
javax.xml.transform.TransformerException: No output specified

Note that:

• So J2SDK 1.4.1_01 is using the org.apache.xalan package for XSL transformation.
• The Identity transformer was used, because the program is specify any transformation rules.
• I got the "No output specified" exception, because the program was transforming from nothing (empty source object) to nowhere (empty result object).

Last update: 2006.

Sections in This Chapter

XSL (Extensible Stylesheet Language) - Implementation in JDK

XSLTransformer.java - XML Transformer