io.circe.generic.extras.decoding.UnwrappedDecoder.scala Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of circe-generic-extras_2.10 Show documentation

circe generic extras

The newest version!

package io.circe.generic.extras.decoding

import io.circe.{Decoder, HCursor}
import shapeless.{::, Generic, HNil, Lazy}

abstract class UnwrappedDecoder[A] extends Decoder[A]

final object UnwrappedDecoder {
  implicit def decodeUnwrapped[A <: AnyVal, R](
    implicit
    gen:    Lazy[Generic.Aux[A, R :: HNil]],
    decode: Decoder[R]
  ): UnwrappedDecoder[A] = new UnwrappedDecoder[A] {
    override def apply(c: HCursor): Decoder.Result[A] =
      decode(c) match {
        case Right(unwrapped) => Right(gen.value.from(unwrapped :: HNil))
        case l @ Left(_) => l.asInstanceOf[Decoder.Result[A]]
      }
  }
}