code: public static <S, T extends Event, U extends T> InputMapTemplate<S, U> ignore(
              EventPattern<? super T, ? extends U> eventPattern) {
          return new PatternActionTemplate<>(eventPattern, PatternActionTemplate.CONST_IGNORE);
      }
docs: If the given {@link EventPattern} matches the given event type, does nothing and does not attempt
  to match additional {@code InputMap}s (if they exist).