Class ProtectedFunctionMapper

  • All Implemented Interfaces:
    FunctionMapper

    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 Detail

      • getInstance

        public static ProtectedFunctionMapper getInstance()
        Generated Servlet and Tag Handler implementations call this method to retrieve an instance of the ProtectedFunctionMapper.
        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
        Returns:
        the mapped function
        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 interface FunctionMapper
        Specified by:
        resolveFunction in class 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.