A generic class that describe data with a status used Sealed classes in Kotlin (rather than using enum)

Resource.kt

import java.util.*

sealed class Resource {
    class Success<out T>(val data: T, val date: Date?): Resource()
    class Error(val message: String, val date: Date?): Resource()
    class Loading<out T>(val data: T): Resource()
    class Cached<out T>(val data: T, val date: Date?): Resource()
    object ReAuthenticate : Resource()
    object Logout: Resource()
}



/* 
Usage:
  Resource.Success(response.body(), Date())
  Resource.Logout()
*/