scala enumeratum enum 사용하기

enumeratum 을 사용해 보자

 

build.sbt 에 라이브러리를 추가한다.

libraryDependencies ++= Seq(
  "com.beachape" %% "enumeratum"           % "1.7.0",
  "com.beachape" %% "enumeratum-play-json" % "1.7.0"
)

 

간단한 경우

import enumeratum._
import play.api.libs.json.Json

import scala.collection.immutable

sealed abstract class Country extends EnumEntry
object Country extends Enum[Country] with PlayJsonEnum[Country] {
  override def values: immutable.IndexedSeq[Country] = findValues

  case object Kr extends Country
  case object Jp extends Country
}

object SimpleTest {
  def main(args: Array[String]): Unit = {
    val country: Country = Country.withName("Kr")
    Country.withName("kr") // java.util.NoSuchElementException

    println(country.entryName)               // Kr
    println(country.toString)                // Kr
    println(Json.toJson(country).toString()) // "Kr"
  }
}

 

복잡한 경우

import enumeratum._
import play.api.libs.json.Json

import scala.collection.immutable

sealed abstract class Country(val lang: String) extends EnumEntry
object Country extends Enum[Country] with PlayJsonEnum[Country] {
  override def values: immutable.IndexedSeq[Country] = findValues

  case object Kr extends Country("ko") {
    override def entryName: String = "kr"
  }

  case object Jp extends Country("ja") {
    override def entryName: String = "jp"
  }
}

object ComplexTest {
  def main(args: Array[String]): Unit = {
    val country: Country = Country.withName("kr")
    Country.withName("Kr")      // java.util.NoSuchElementException

    println(country.lang)       // ko
    println(country.entryName)  // kr
    println(country.toString)   // Kr
    println(Json.toJson(country).toString()) // "kr"   
  }
}