Ticket.kt

fun main(args : Array<String>) {
}

enum class TicketStatus {
  OPEN
  FIXED
}

trait Ticket {
  val id: Long
  val title: String
  val status: TicketStatus
}

data class Issue(override val id: Long,
                 override val title: String,
                 override val status: TicketStatus = TicketStatus.OPEN): Ticket

data class Bug(override val id: Long,
               override val title: String,
               val description: String,
               override val status: TicketStatus = TicketStatus.OPEN): Ticket

object TicketRepo {
  val map: Map<Long, Ticket> = mapOf(
    1L to Issue(1L, "1"),
    2L to Bug(2L, "2", "hoge"),
    3L to Issue(3L, "3", TicketStatus.FIXED),
    4L to Bug(4L, "4", "fuga", TicketStatus.FIXED)
  )
}