org.apache.commons.jxpath
Interface Function

All Known Implementing Classes:

MethodFunction, ConstructorFunction

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: 1.5 $ $Date: 2003/03/11 00:59:12 $

Author:

Dmitri Plotnikov

Method Summary

java.lang.Object

invoke(ExpressionContext context, java.lang.Object[] parameters) Computes the value of the function.

Method Detail

invoke

public 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.