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