Method asImmutable

output/java_guava/1.4.18/ImmutableEnumSet.java:35–45

(EnumSet set)

@SuppressWarnings("serial") // we're overriding default serialization
final class ImmutableEnumSet<E extends Enum<E>> extends ImmutableSet<E> {
  @SuppressWarnings("rawtypes") // necessary to compile against Java 8
  static ImmutableSet asImmutable(EnumSet set) {
    switch (set.size()) {
      case 0:
        return ImmutableSet.of();
      case 1:
        return ImmutableSet.of(Iterables.getOnlyElement(set));
      default:
        return new ImmutableEnumSet(set);
    }
  }

  /*
   * Notes on EnumSet and <E extends Enum<E>>: