runtime/src/main/java/org/echocat/jomon/runtime/CollectionUtils.java
@Nonnull
    public static <T> Set<T> addAllAndMakeImmutable(@Nonnull Set<T> original, @Nullable T... objects) {
        return unmodifiableSet(addAll(original, objects));
    }
@Nonnull
    public static <T> Set<T> addAllAndMakeImmutable(@Nonnull Set<T> original, @Nullable T... objects) {
        return unmodifiableSet(addAll(original, objects));
    }
Returns an unmodifiable {@link Set} containing the given <code>objects</code>.