How to ensure completeness in an enum switch at compile time?

Question

I have several switch statements which test an enum. All enum values must be handled in the switch statements by a case s

Answer 1

The Enum Mapper project provides an an annotation processor which will make sure at compile-time that all enum constants are handled.
Moreover it supports reverse lookup and paritial mappers.

Usage example:

@EnumMapper
public enum Seasons {
  SPRING, SUMMER, FALL, WINTER
}

The annotation processor will generate a java class Seasons_MapperFull, which can be used to map all enum constants to arbitrary values.

Here is an example use where we map each enum constant to a string.

EnumMapperFull germanSeasons = Seasons_MapperFull
     .setSPRING("Fruehling")
     .setSUMMER("Sommer")
     .setFALL("Herbst")
     .setWINTER("Winter");

You can now use the mapper to get the values, or do reverse lookup

String germanSummer = germanSeasons.getValue(Seasons.SUMMER); // returns "Sommer"
ExtremeSeasons.getEnumOrNull("Sommer");                 // returns the enum-constant SUMMER
ExtremeSeasons.getEnumOrRaise("Fruehling");             // throws an IllegalArgumentException