Package jakarta.el

Class 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 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