jpbetz / courscala

Core Scala classes used to build Coursera.

Courscala

Core Scala classes used to build Coursera.

Enum[T]

Defines "ADT" based Scala enumerations.

Each enumeration is composed of a sealed type plus case objects for each enum symbol, enabling exhaustive pattern matching.

Base traits are extended to provide convenience operations similar to those provided by scala.Enumeration.

Example usage:

sealed trait Color extends EnumSymbol

object Color extends Enum[Color] {
  case object RED extends Color
  case object AMBER extends Color
  case object GREEN extends Color
  case object BLUE extends Color
}

scala> Color.symbols
res1: Set[Color] = Set(RED, AMBER, GREEN, BLUE)

scala> Color.withName("RED")
res2: Color.RED.type = RED

Additional traits such as IndexedEnum and AliasedEnumSymbol are provided for cases where symbols need explicit ordering or alternate string names.

See the Enum Scaladoc for additional details.