org.openanzo.glitter.expression
Class FunctionRegistry

java.lang.Object
  org.openanzo.glitter.expression.FunctionRegistry

public class FunctionRegistry
extends java.lang.Object

A singleton class that maintains a mapping from function URIs to Functions

Author:

lee

Method Summary

Function	getFunction(java.lang.String name)
Function	getFunction(java.net.URI name)
static FunctionRegistry	getRegistry()
void	registerFunction(java.net.URI name, Function f) Register a function.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

getRegistry

public static FunctionRegistry getRegistry()

Returns:

The singleton FunctionRegistry instance.

registerFunction

public void registerFunction(java.net.URI name,
                             Function f)

Register a function. It is a parse error if a query is received that references a function not registered in the FunctionRegistry.

Parameters:

name - Identifies the function

f - The function itself

getFunction

public Function getFunction(java.net.URI name)

Parameters:

name - Identifies the desired function

Returns:

The function associated with the given name, or null if no such function is registered.

getFunction

public Function getFunction(java.lang.String name)

Parameters:

name - Identifies the desired function

Returns:

The function associated with the given name, or null if no such function is registered.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object