sjsonnew.JsonKeyFormat.scala Maven / Gradle / Ivy

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A Scala library for JSON (de)serialization

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package sjsonnew

import scala.annotation.implicitNotFound

/** A typeclass for converting values of type `A` to strings, used for encoding instances of `Map[A, ?]`. */
@implicitNotFound(msg = "Cannot find JsonKeyWriter or JsonKeyFormat type class for ${A}")
trait JsonKeyWriter[A] {
  def write(key: A): String
}

/** A typeclass for converting strings to values of type `A`, used for decoding instances of `Map[A, ?]`. */
@implicitNotFound(msg = "Cannot find JsonKeyReader or JsonKeyFormat type class for ${A}")
trait JsonKeyReader[A] {
  def read(key: String): A
}

/** A typeclasses for encoding and decoding instances of `Map[A, ?]`. */
trait JsonKeyFormat[A] extends JsonKeyWriter[A] with JsonKeyReader[A]

object JsonKeyFormat {
  def apply[A](w: A => String, r: String => A): JsonKeyFormat[A] = new JsonKeyFormat[A] {
    def write(key: A) = w(key)
    def read(key: String) = r(key)
  }
}