Method map

src/main/java/net/minecraftforge/fml/OptionalMod.java:142–149

If a mod object is present, apply the provided mapping function to it, and if the result is non-null, return an Optional describing the result. Otherwise return an empty Optional. @apiNote This method supports post-processing on optional values, without the need to explicitly check

(Function<? super T, ? extends U> mapper)

     * @throws NullPointerException if the mapping function is null
     */
    public<U> Optional<U> map(Function<? super T, ? extends U> mapper) {
        Objects.requireNonNull(mapper);
        if (!isPresent())
            return Optional.empty();
        else {
            return Optional.ofNullable(mapper.apply(getValue()));
        }
    }

    /**
     * If a value is present, apply the provided {@code Optional}-bearing