code: public void visitEnum(String name, String desc, String value) {
          if (av != null) {
              av.visitEnum(name, desc, value);
          }
      }
docs: Visits an enumeration value of the annotation.
  
  @param name
  the value name.
  @param desc
  the class descriptor of the enumeration class.
  @param value
  the actual enumeration value.