doobie.enum.fetchdirection.scala Maven / Gradle / Ivy

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Pure functional JDBC layer for Scala.

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package doobie.enum

import doobie.util.invariant._

import java.sql.ResultSet._

import scalaz.Equal
import scalaz.std.anyVal.intInstance

object fetchdirection {

  /** @group Implementation */
  sealed abstract class FetchDirection(val toInt: Int)

  /** @group Values */ case object Forward extends FetchDirection(FETCH_FORWARD)
  /** @group Values */ case object Reverse extends FetchDirection(FETCH_REVERSE)
  /** @group Values */ case object Unknown extends FetchDirection(FETCH_UNKNOWN)

  /** @group Implementation */
  object FetchDirection {

    def fromInt(n: Int): Option[FetchDirection] =
      Some(n) collect {
        case Forward.toInt => Forward
        case Reverse.toInt => Reverse
        case Unknown.toInt => Unknown
      }

    def unsafeFromInt(n: Int): FetchDirection =
      fromInt(n).getOrElse(throw InvalidOrdinal[FetchDirection](n))

    implicit val EqualFetchDirection: Equal[FetchDirection] =
      Equal.equalBy(_.toInt)

  }

}