XPathFunctionContext (werken.xpath API)

java.lang.Object
- com.werken.xpath.XPathFunctionContext

All Implemented Interfaces:

FunctionContext
```
public class XPathFunctionContext
extends java.lang.Object
implements FunctionContext
```
Implementation of FunctionContext which matches the core function library as described by the W3C XPath Specification.

May be directly instantiated or subclassed. A Singleton is provided for ease-of-use in the default case of bare XPaths.

Author:

bob mcwhirter (bob @ werken.com)

Constructor Summary

Constructors
Constructor Description

XPathFunctionContext()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`addFunction(java.lang.String name, Function func)`	Add a function to this FunctionContext
`Function`	`getFunction(java.lang.String name)`	Retrieve a named function
`static XPathFunctionContext`	`getInstance()`	Get the XPathFunctionContext singleton.

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

- Constructor Detail
  - XPathFunctionContext
```
public XPathFunctionContext()
```
- Method Detail
  - getInstance
```
public static XPathFunctionContext getInstance()
```
    Get the XPathFunctionContext singleton.
    
    Returns:
    
    The global, immutable FunctionContext which matches the functions as described by the W3C XPath specification.
  - addFunction
```
protected void addFunction(java.lang.String name,
                           Function func)
```
    Add a function to this FunctionContext
    
    Parameters:
    
    name - The name of the function.
    
    func - The implementing Function Object.
  - getFunction
```
public Function getFunction(java.lang.String name)
```
    Retrieve a named function
    Retrieve the named function object, or null if no such function exists.
    
    Specified by:
    
    getFunction in interface FunctionContext
    
    Parameters:
    
    name - The name of the function sought.
    
    Returns:
    
    The Function matching the specified name.
    
    See Also:
    
    com.werken.xpath.ContextHelper#setFunctionContext