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PreparedQuery.scala
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PreparedQuery.scala
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/*
* Copyright 2023 Valdemar Grange
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package gql.preparation
import cats.data._
import cats.implicits._
import gql.resolver._
import io.circe._
import gql.parser.{QueryAst => QA}
import gql.parser.AnyValue
import gql.Arg
import cats.Eval
import gql.ast
sealed trait PreparedField[+F[_], A] extends Product with Serializable
sealed trait PreparedStep[+F[_], -I, +O] extends Product with Serializable
object PreparedStep {
final case class Lift[F[_], I, O](f: I => O) extends AnyRef with PreparedStep[F, I, O]
final case class EmbedEffect[F[_], I](stableUniqueEdgeName: UniqueEdgeCursor) extends AnyRef with PreparedStep[F, F[I], I]
final case class EmbedStream[F[_], I](signal: Boolean, stableUniqueEdgeName: UniqueEdgeCursor)
extends AnyRef
with PreparedStep[F, fs2.Stream[F, I], I]
final case class EmbedError[F[_], I]() extends AnyRef with PreparedStep[F, Ior[String, I], I]
final case class Compose[F[_], I, A, O](left: PreparedStep[F, I, A], right: PreparedStep[F, A, O])
extends AnyRef
with PreparedStep[F, I, O]
final case class GetMeta[F[_], I](meta: Eval[PreparedMeta[F]]) extends AnyRef with PreparedStep[Nothing, I, FieldMeta[F]]
final case class First[F[_], I, O, C](step: PreparedStep[F, I, O]) extends AnyRef with PreparedStep[F, (I, C), (O, C)]
final case class Batch[F[_], K, V](id: Step.BatchKey[K, V], globalEdgeId: UniqueBatchInstance[K, V])
extends AnyRef
with PreparedStep[F, Set[K], Map[K, V]]
final case class InlineBatch[F[_], K, V](run: Set[K] => F[Map[K, V]], stableUniqueEdgeName: UniqueEdgeCursor)
extends PreparedStep[F, Set[K], Map[K, V]]
final case class Choose[F[_], A, B, C, D](
fac: PreparedStep[F, A, C],
fbc: PreparedStep[F, B, D]
) extends PreparedStep[F, Either[A, B], Either[C, D]]
}
sealed trait Prepared[+F[_], I]
final case class PreparedCont[+F[_], I, A](
edges: PreparedStep[F, I, A],
cont: Prepared[F, A]
)
final case class Selection[F[_], I](
fields: List[PreparedField[F, I]],
source: ast.Selectable[F, I]
) extends Prepared[F, I]
final case class PreparedList[F[_], A, C, B](of: PreparedCont[F, A, B], toSeq: C => Seq[A]) extends Prepared[F, C]
final case class PreparedOption[F[_], I, O](of: PreparedCont[F, I, O]) extends Prepared[F, Option[I]]
final case class PreparedLeaf[F[_], I](name: String, encode: I => Json) extends Prepared[F, I]
final case class PreparedDataField[+F[_], A, B](
name: String,
alias: Option[String],
cont: PreparedCont[F, A, B],
source: ast.Field[F, A, B],
parsedArgs: Map[Arg[?], Any]
) extends PreparedField[F, A] {
lazy val outputName = alias.getOrElse(name)
def arg[C](a: Arg[C]): Option[C] =
parsedArgs.get(a).asInstanceOf[Option[C]]
}
sealed trait Specialization[F[_], A, B] {
def specify(a: A): Ior[String, Option[B]]
def source: ast.Selectable[F, A]
def target: ast.Type[F, B]
def typename = target.name
}
object Specialization {
final case class Type[F[_], A](
source: ast.Type[F, A]
) extends Specialization[F, A, A] {
def target: ast.Type[F, A] = source
def specify(a: A): Ior[String, Option[A]] = a.rightIor.map(_.some)
}
final case class Union[F[_], A, B](
source: ast.Union[F, A],
variant: ast.Variant[F, A, B]
) extends Specialization[F, A, B] {
def target = variant.tpe.value
def specify(a: A): Ior[String, Option[B]] = variant.specify(a)
}
final case class Interface[F[_], A, B](
target: ast.Type[F, B],
impl: ast.Implementation[F, B, A]
) extends Specialization[F, A, B] {
def source = impl.implementation.value
def specify(a: A): Ior[String, Option[B]] = impl.specify(a)
}
}
final case class PreparedSpecification[F[_], I, A](
specialization: Specialization[F, I, A],
selection: List[PreparedDataField[F, A, ?]]
) extends PreparedField[F, I]
final case class PreparedMeta[+F[_]](
variables: VariableMap[Unit],
args: Option[QA.Arguments[Unit, AnyValue]],
pdf: PreparedDataField[F, ?, ?]
)
final case class UniqueBatchInstance[K, V](id: NonEmptyList[Int]) extends AnyVal {
def alpha(i: Int): UniqueBatchInstance[K, V] = UniqueBatchInstance(i :: id)
}
final case class UniqueEdgeCursor(path: NonEmptyChain[String]) {
def append(name: String): UniqueEdgeCursor = UniqueEdgeCursor(path append name)
lazy val asString: String = path.mkString_(".")
}
object UniqueEdgeCursor {
def apply(name: String): UniqueEdgeCursor = UniqueEdgeCursor(NonEmptyChain.one(name))
}