returns a method corresponding to the given java methoddeclaration . concode_field_sep String name concode_elem_sep Map DESCRIPTORS concode_elem_sep String desc concode_field_sep String getDescriptor concode_elem_sep Type[] getArgumentTypes concode_elem_sep String getName concode_elem_sep Type getReturnType concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep String toString concode_elem_sep String map