• Chapter 1: Getting Started with Stylus Studio®
• Chapter 2: Editing and Querying XML
• Chapter 3: Converting Non-XML Files to XML
• Chapter 4: Working with XSLT
  • Getting Started with XSLT
  • Tutorial: Understanding How Templates Work
  • Working with Stylesheets
  • Creating Stylesheets That Generate HTML
  • Specifying Extension Functions in Stylesheets
    • Using an Extension Function in Stylus Studio
    • Basic Data Types
    • Declaring an XSLT Extension Function
    • Working with XPath Data Types
    • Declaring an Extension Function Namespace
    • Invoking Extension Functions
    • Finding Classes and Finding Java
    • Debugging Stylesheets That Contain Extension Functions
  • Working with Templates
  • Using Third-Party XSLT Processors
  • Validating Result Documents
  • Post-processing Result Documents
  • Generating Formatting Objects
  • Generating Scalable Vector Graphics
  • Generating Java Code for XSLT
  • XSLT Instructions Quick Reference
• Chapter 5: Creating XSLT Using the XSLT Mapper
• Chapter 6: Debugging Stylesheets
• Chapter 7: Defining XML Schemas
• Chapter 8: Defining Document Type Definitions
• Chapter 9: Writing XPath Expressions
• Chapter 10: Working with XQuery in Stylus Studio
• Chapter 11: Composing Web Service Calls
• Chapter 12: Accessing Relational Data as XML
• Chapter 13: Building XML Pipelines
• Chapter 14: Publishing XML Data
• Chapter 15: Integrating with Third-Party File Systems
• Chapter 16: Extending Stylus Studio
• Chapter 17: The Stylus Studio Java API
• Chapter 18: Stylus Studio GUI Reference

Home > Online Product Documentation > Table of Contents > Declaring an XSLT Extension Function

Declaring an XSLT Extension Function

Extension functions must have one of the following signatures:

public Object FxnName()
       
public Object FxnName(Type1 var1, Type2 var2,...)
       
public static Object FxnName()
       
public static Object FxnName(Type1 var1, Type2 var2,...)
       

    

A class that contains an extension function might look like the following:

import org.w3c.dom.*;
               
import java.lang.Double;
               
public class NumberUtils
               
{ 
               
  public Object Average(NodeList nl)
               
  {
               
    double nSum = 0;
               
  for (int i = nl.getLength() - 1; i >= 0; i--)
               
   {
               
    nSum += 
               
    Double.valueOf(nl.item(i).
               
    getNodeValue()).doubleValue();
               
   }
               
  return new Double(nSum / nl.getLength());
               
  }
               
}