Function

All Known Implementing Classes:

ConstructorFunction, MethodFunction
```
public interface Function
```
Extension function interface. Extension functions are grouped into Functions objects, which are installed on JXPathContexts using the JXPathContext.setFunctions() call.
The Function interface can be implemented directly. However, most of the time JXPath's built-in implementations should suffice. See ClassFunctions and PackageFunctions.

Version:

$Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.Object`	`invoke(ExpressionContext context, java.lang.Object[] parameters)`	Computes the value of the function.

- Method Detail
  - invoke
```
java.lang.Object invoke(ExpressionContext context,
                        java.lang.Object[] parameters)
```
    Computes the value of the function. Each implementation of Function is responsible for conversion of supplied parameters to the required argument types.
    
    Parameters:
    
    context - can be used to acquire the context in which the function is being evaluted.
    
    parameters - function arguments
    
    Returns:
    
    Object result