fs2.data.csv.generic.internal.DerivedRowDecoder.scala Maven / Gradle / Ivy

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Generic CSV row decoder generation

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/*
 * Copyright 2024 fs2-data Project
 *
 * 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 fs2.data.csv.generic.internal

import fs2.data.csv.{DecoderResult, Row, RowDecoder}
import shapeless._

trait DerivedRowDecoder[T] extends RowDecoder[T]

object DerivedRowDecoder {

  final implicit def productDecoder[T, Repr <: HList](implicit
      gen: Generic.Aux[T, Repr],
      cc: Lazy[SeqShapedRowDecoder[Repr]]): DerivedRowDecoder[T] =
    new DerivedRowDecoder[T] {

      def apply(row: Row): DecoderResult[T] =
        cc.value(row).map(gen.from(_))
    }

}