geotrellis.server.HasRasterExtents.scala Maven / Gradle / Ivy

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GeoTrellis Server is a set of components designed to simplify viewing, processing, and serving raster data from arbitrary sources with an emphasis on doing so in a functional style.

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/*
 * Copyright 2020 Azavea
 *
 * 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 geotrellis.server

import geotrellis.raster.RasterExtent

import cats.Contravariant
import cats.data.{NonEmptyList => NEL}

trait HasRasterExtents[F[_], A] {
  def rasterExtents(self: A): F[NEL[RasterExtent]]
}

object HasRasterExtents {
  def apply[F[_], A](implicit ev: HasRasterExtents[F, A]): HasRasterExtents[F, A] = ev

  implicit def contravariantHasRasterExtents[F[_]]: Contravariant[HasRasterExtents[F, *]] =
    new Contravariant[HasRasterExtents[F, *]] {

      def contramap[A, B](fa: HasRasterExtents[F, A])(f: B => A): HasRasterExtents[F, B] = { self =>
        fa.rasterExtents(f(self))
      }
    }
}