enum class mapping issue when enum not found

user_4033050 0
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I have a class in kotlin which is an enum class as below

enum class Status {
  @SerializedName("open")
  OPEN,
  @SerializedName("close")
  CLOSE,
  UNKNOWN
}

I have another class called ticket using the status enum class

class Order(
    var id: String,
    var status: Status = Status.UNKNOWN,
}

When the GSON map the value received, I have an exception because the status field now contains a new value in_progress. As this state is not declared in the Status class, the exception happened.

How can I avoid the exception to make sure that if a new status is set in the GSON but not defined in the Status class, I got status UNKNOWN?

Any idea on how to return a default value UNKNOWN in my case when nothing match ?

Thanks

kotlin gson json java
1 Answers

If you want to go down this road then your problem is the enum. GSON is waiting for an enum value so if in_progress isn't a value GSON will say no.

What you can do is creating a new datatyp and wrap your enum in it, but the generell Idea for using a enum is lost.

A different approach is to get rid of the enum completely. Implementing an interface called status and implement a class for every type of Status. This is kinda a enum+. You can than send your Order with something like Var Status : OrderStatus = In_Progress() Var Status: OrderStatus = Unkonwn() Later you can call something like instanceof to get the type of OrderStatus checked.

After your edit: You must say GSON exactly what you are waiting for (see GSON Adapters) if you want the behaviour from your description you should look for an other way to communicate.

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