Stream<Egg> validatedEggStream = eggs.stream().map(egg -> validate(egg));

private <what-should-I-return?> validate(Egg egg) {
  boolean isValid = false;
  if (!egg.isRotten()) {
    if (egg.getYellow() != null) {
      try {
        makeHalfBoiledOmelette(egg); // My Fav
        isValid = true;
      } catch (EggException e) {
        return <How-to-return-exception?>; // case 1
      }
    } else if (egg.getEggWhite() != null) {
      eggWhiteDefect = examineEggWhite(egg); // case 2
      isValid = (eggWhiteDefect == null);
    } else {
      return <not-an-egg>; // case 3
    }
  }
  return isValid ? egg : <How-to-return-defect?>;
}