How to Implement Functions for All Other Components

For Oracle BPEL Process Manager, Oracle Mediator, and human workflow functions, you must implement either the oracle.fabric.common.xml.xpath.IXPathFunction interface (defined in the fabric-runtime.jar file) or javax.xml.xpath.XPathFunction.

To implement functions for all other components:

Implement the oracle.fabric.common.xml.xpath.IXPathFunction interface for your XPath function. The IXPathFunction interface has one method named call(context, args). The signature of this method is as shown in the following example:

 package oracle.fabric.common.xml.xpath;
 public interface IXPathFunction
 {
    /** Call this function.
    *
    *  @param context The context at the point in the
    *         expression when the function is called.
    *  @param args List of arguments provided during
    *         the call of the function.
    */
    public Object call(IXPathContext context, List args) throws
 XPathFunctionException;
 }

where:

context: The context at the point in the expression when the function is called.
args: The list of arguments provided during the call of the function.

For the following example, a function named getNodeValue(arg1) is implemented that gets a value of w3c node:

package com.collaxa.cube.xml.xpath.dom.functions;
 import oracle.fabric.common.xml.xpath.IXPathFunction;
 import oracle.fabric.common.xml.xpath.IXPathFunction
 . . .

 public class GetNodeValue implements IXPathFunction {
    Object call(IXPathContext context, List args) throws XPathFunctionException
 {
        org.w3c.dom.Node node = (org.w3c.dom.Node) args.get(0);
        return node.getNodeValue()
    }
 }