org.apache.jasper.runtime

Class ProtectedFunctionMapper

java.lang.Object

javax.el.FunctionMapper

org.apache.jasper.runtime.ProtectedFunctionMapper

public final class ProtectedFunctionMapper
extends javax.el.FunctionMapper

Maps EL functions to their Java method counterparts. Keeps the actual Method objects protected so that JSP pages can't indirectly do reflection.

Author:

Mark Roth, Kin-man Chung

Method Summary

Methods

Modifier and Type	Method and Description
static ProtectedFunctionMapper	getInstance() Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper.
static ProtectedFunctionMapper	getMapForFunction(String fnQName, Class<?> c, String methodName, Class<?>[] args) Creates an instance for this class, and stores the Method for the given EL function prefix and name.
void	mapFunction(String fnQName, Class<?> c, String methodName, Class<?>[] args) Stores a mapping from the given EL function prefix and name to the given Java method.
Method	resolveFunction(String prefix, String localName) Resolves the specified local name and prefix into a Java.lang.Method.

Methods inherited from class java.lang.Object

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

Method Detail

getInstance

public static ProtectedFunctionMapper getInstance()

Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper. This is necessary since generated code does not have access to create instances of classes in this package.

Returns:

A new protected function mapper.

mapFunction

public void mapFunction(String fnQName,
               Class<?> c,
               String methodName,
               Class<?>[] args)

Stores a mapping from the given EL function prefix and name to the given Java method.

Parameters:

fnQName - The EL function qualified name (including prefix)

c - The class containing the Java method

methodName - The name of the Java method

args - The arguments of the Java method

Throws:

RuntimeException - if no method with the given signature could be found.

getMapForFunction

public static ProtectedFunctionMapper getMapForFunction(String fnQName,
                                        Class<?> c,
                                        String methodName,
                                        Class<?>[] args)

Creates an instance for this class, and stores the Method for the given EL function prefix and name. This method is used for the case when there is only one function in the EL expression.

Parameters:

fnQName - The EL function qualified name (including prefix)

c - The class containing the Java method

methodName - The name of the Java method

args - The arguments of the Java method

Throws:

RuntimeException - if no method with the given signature could be found.

resolveFunction

public Method resolveFunction(String prefix,
                     String localName)

Resolves the specified local name and prefix into a Java.lang.Method. Returns null if the prefix and local name are not found.

Specified by:

resolveFunction in class javax.el.FunctionMapper

Parameters:

prefix - the prefix of the function

localName - the short name of the function

Returns:

the result of the method mapping. Null means no entry found.