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• OpenEnum.scala

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iozhik.OpenEnum.scala Maven / Gradle / Ivy

package iozhik

import io.circe.Encoder

/** Indicates that the enumeration is open and can accept values beyond those already specified.
  */
sealed trait OpenEnum[+T]

object OpenEnum {
  case class Known[T](value: T)        extends OpenEnum[T]
  case class Unknown[T](value: String) extends OpenEnum[T]

  def apply[T](value: T): OpenEnum[T] = Known(value)

  implicit def encoder[T: Encoder]: Encoder[OpenEnum[T]] = {
    case Known(value)   => Encoder[T].apply(value)
    case Unknown(value) => Encoder[String].apply(value)
  }

}