javax.el

Class FunctionMapper

java.lang.Object

javax.el.FunctionMapper

public abstract class FunctionMapper
extends Object

The interface to a map between Jakarta Expression Language function names and methods.

A FunctionMapper maps ${prefix:name()} style functions to a static method that can execute that function.

Since:

Jakarta Server Pages 2.1

Constructor Summary

Constructors

Constructor and Description
FunctionMapper()

Method Summary

Modifier and Type	Method and Description
void	mapFunction(String prefix, String localName, Method meth) Adds a static method that can be used as a function.
abstract Method	resolveFunction(String prefix, String localName) Resolves the specified prefix and local name into a java.lang.Method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FunctionMapper

public FunctionMapper()

Method Detail

resolveFunction

public abstract Method resolveFunction(String prefix,
                                       String localName)

Resolves the specified prefix and local name into a java.lang.Method.

Returns null if no function could be found that matches the given prefix and local name.

Parameters:

prefix - the prefix of the function, or "" if no prefix. For example, "fn" in ${fn:method()}, or "" in ${method()}.

localName - the short name of the function. For example, "method" in ${fn:method()}.

Returns:

the static method to invoke, or null if no match was found.

mapFunction

public void mapFunction(String prefix,
                        String localName,
                        Method meth)

Adds a static method that can be used as a function.

Parameters:

prefix - the prefix of the function, or "" if no prefix. For example, "fn" in ${fn:method()}, or "" in ${method()}.

localName - the short name of the function. For example, "method" in ${fn:method()}.

meth - The static method that is to be invoked, when the function is referenced. The null value causes the function to be removed from the map.

Since:

Jakarta Expression Language 3.0