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Resolver.scala
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Resolver.scala
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package gql.resolver
import cats._
import cats.data._
import fs2.Stream
trait Resolver[F[_], -I, A] {
def mapK[G[_]: Functor](fk: F ~> G): Resolver[G, I, A]
def contramap[B](g: B => I): Resolver[F, B, A]
}
final case class FallibleResolver[F[_], I, A](resolve: I => F[Ior[String, A]]) extends Resolver[F, I, A] {
def mapK[G[_]: Functor](fk: F ~> G): FallibleResolver[G, I, A] =
FallibleResolver(resolve.andThen(fk.apply))
def contramap[B](g: B => I): FallibleResolver[F, B, A] =
FallibleResolver(g andThen resolve)
}
final case class EffectResolver[F[_], I, A](resolve: I => F[A]) extends Resolver[F, I, A] {
def mapK[G[_]: Functor](fk: F ~> G): EffectResolver[G, I, A] =
EffectResolver(resolve.andThen(fk.apply))
def contramap[B](g: B => I): EffectResolver[F, B, A] =
EffectResolver(g andThen resolve)
}
final case class PureResolver[F[_], I, A](resolve: I => A) extends Resolver[F, I, A] {
override def mapK[G[_]: Functor](fk: F ~> G): PureResolver[G, I, A] =
PureResolver(resolve)
def contramap[B](g: B => I): PureResolver[F, B, A] =
PureResolver(g andThen resolve)
}
final case class StreamResolver[F[_], I, R, A](
stream: I => Stream[F, IorNec[String, R]]
) extends Resolver[F, I, A] {
override def mapK[G[_]: Functor](fk: F ~> G): Resolver[G, I, A] =
StreamResolver(stream.andThen(_.translate(fk)))
override def contramap[B](g: B => I): Resolver[F, B, A] =
StreamResolver[F, B, R, A](i => stream(g(i)))
}
final case class CompositionResolver[F[_], I, A, O](
left: Resolver[F, I, A],
right: Resolver[F, A, O]
) extends Resolver[F, I, O] {
override def mapK[G[_]: Functor](fk: F ~> G): Resolver[G, I, O] =
CompositionResolver(left.mapK(fk), right.mapK(fk))
override def contramap[B](g: B => I): Resolver[F, B, O] =
CompositionResolver(left.contramap(g), right)
}