}

  private boolean isExpired(Timestamped<V> stamped) {
    if ((expireAfterAccess == UNSET_INT) && (expireAfterWrite == UNSET_INT)) {
      return false;
    }

    boolean expireWrite = stamped.getWriteTimestamp() + expireAfterWrite <= currentTimeNanos();
    boolean expireAccess = stamped.getAccessTimestamp() + expireAfterAccess <= currentTimeNanos();

    if (expireAfterAccess == UNSET_INT) {
      return expireWrite;