ClassFunctions (Commons JXPath 1.3 API)

java.lang.Object
- org.apache.commons.jxpath.ClassFunctions

All Implemented Interfaces:

Functions
```
public class ClassFunctions
extends Object
implements Functions
```
Extension functions provided by a Java class. Let's say we declared a ClassFunction like this:
```
     new ClassFunctions(Integer.class, "int")
 
```
We can now use XPaths like:

"int:new(3)"

Equivalent to new Integer(3)

"int:getInteger('foo')"

Equivalent to Integer.getInteger("foo")

"int:floatValue(int:new(4))"

Equivalent to new Integer(4).floatValue()

If the first argument of a method is ExpressionContext, the expression context in which the function is evaluated is passed to the method.
Version:

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

Author:

Dmitri Plotnikov

Constructor Summary

Constructors
Constructor Description

ClassFunctions(Class functionClass, String namespace)
Create a new ClassFunctions.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Function`	`getFunction(String namespace, String name, Object[] parameters)`	Returns a `Function`, if any, for the specified namespace, name and parameter types.
`Set`	`getUsedNamespaces()`	Returns a set of one namespace - the one specified in the constructor.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ClassFunctions
```
public ClassFunctions(Class functionClass,
                      String namespace)
```
    Create a new ClassFunctions.
    
    Parameters:
    
    functionClass - Class providing the functions
    
    namespace - assigned ns
- Method Detail
  - getUsedNamespaces
```
public Set getUsedNamespaces()
```
    Returns a set of one namespace - the one specified in the constructor.
    
    Specified by:
    
    getUsedNamespaces in interface Functions
    
    Returns:
    
    a singleton
  - getFunction
```
public Function getFunction(String namespace,
                            String name,
                            Object[] parameters)
```
    Returns a Function, if any, for the specified namespace, name and parameter types.
    
    Specified by:
    
    getFunction in interface Functions
    
    Parameters:
    
    namespace - if it is not the namespace specified in the constructor, the method returns null
    
    name - is a function name or "new" for a constructor.
    
    parameters - Object[] of parameters
    
    Returns:
    
    a MethodFunction, a ConstructorFunction or null if there is no such function.