mapping between two string arrays

[Arjun Shastry]

We have input as array of strings. Based on some rule output string needs to be created.
For example- take the statuses of Order.{"Created","Confirmed","Shipped","Out for Delivery","Cancelled"} . Final status will be calculated based on combination of inputs. So there are rules given which defined this. For example (Created + Confirmed -> Confirmed) etc.Output Status is given by another team.
Is there any rule engine to do like this ?

[Stephan van Hulst]

What should the result of "Out for Delivery" + "Cancelled" be?

[Arjun Shastry]

Consider it for the time being as 'Cancelled" . These rules will be given by other team. How should we include these in Java programs? Rules Engine?

[Stephan van Hulst]

Honestly, it completely depends on how complex the rules are gonna be. For now, it seems as you only need one rule:

enum OrderStatus {

  CREATED,
  CONFIRMED,
  SHIPPED,
  OUT_FOR_DELIVERY,
  CANCELLED;

  static OrderStatus conflate(Collection<OrderStatus> statuses) {
    return statuses.stream().max(naturalOrder()).get();
  }
}