enums.scala

package object enums {

  trait Day extends Comparable[Day] {
    def name(): String
    def ordinal(): Int
    override def compareTo(o: Day): Int = Integer.compare(this.ordinal(), o.ordinal())
  }

  private[enums] class DayImpl(n: String, i: Int) extends Day {
    def name(): String = n
    def ordinal(): Int = i
  }

  private val enumValues = Seq(
    new DayImpl("MON", 0),
    new DayImpl("TUE", 1),
    new DayImpl("WED", 2),
    new DayImpl("THU", 3),
    new DayImpl("FRI", 4),
    new DayImpl("SAT", 5),
    new DayImpl("SUN", 6)
  )

  object WorkDay {
    val MON: Day = enumValues(0)
    val TUE: Day = enumValues(1)
    val WED: Day = enumValues(2)
    val THU: Day = enumValues(3)
    val FRI: Day = enumValues(4)
    val SAT: Day = enumValues(5)
    val SUN: Day = enumValues(6)
    def find(name: String): Option[Day] = enumValues.find(_.name() == name)
    def valueOf(name: String): Day = enumValues.find(_.name() == name).get
    def values(): Seq[Day] = enumValues
  }
}