org.apache.jasper.runtime

Class ProtectedFunctionMapper

public final class ProtectedFunctionMapper extends FunctionMapper implements 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
static ProtectedFunctionMappergetInstance()
Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper.
static ProtectedFunctionMappergetMapForFunction(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.
voidmapFunction(String fnQName, Class c, String methodName, Class[] args)
Stores a mapping from the given EL function prefix and name to the given Java method.
MethodresolveFunction(String prefix, String localName)
Resolves the specified local name and prefix into a Java.lang.Method.

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.

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.

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.

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.

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.

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