Method filter

src/main/java/net/minecraftforge/fml/OptionalMod.java:119–125

If a mod object is present, and the mod object matches the given predicate, return an OptionalMod describing the value, otherwise return an empty OptionalMod. @param predicate a predicate to apply to the mod object, if present @return an OptionalMod describing the value of t

(Predicate<? super T> predicate)

     * @throws NullPointerException if the predicate is null
     */
    public OptionalMod<T> filter(Predicate<? super T> predicate) {
        Objects.requireNonNull(predicate);
        if (!isPresent())
            return this;
        else
            return predicate.test(getValue()) ? this : empty();
    }

    /**
     * If a mod object is present, apply the provided mapping function to it,