swaydb.KeyOrderConverter.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2020 Simer JS Plaha ([email protected] - @simerplaha)
 *
 * This file is a part of SwayDB.
 *
 * SwayDB is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * SwayDB is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with SwayDB. If not, see .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7:
 * If you modify this Program or any covered work, only by linking or
 * combining it with separate works, the licensors of this Program grant
 * you additional permission to convey the resulting work.
 */

package swaydb

import swaydb.core.util.Eithers
import swaydb.data.order.KeyOrder
import swaydb.data.slice.Slice
import swaydb.serializers.Serializer

protected object KeyOrderConverter {

  def typedToBytesNullCheck[K](byteKeyOrder: KeyOrder[Slice[Byte]], typedKeyOrder: KeyOrder[K])(implicit serializer: Serializer[K]): KeyOrder[Slice[Byte]] =
    typedToBytes(
      Eithers.nullCheck(
        left = byteKeyOrder,
        right = typedKeyOrder,
        default = KeyOrder.default
      )
    )

  def typedToBytes[K](keyOrder: Either[KeyOrder[Slice[Byte]], KeyOrder[K]])(implicit serializer: Serializer[K]): KeyOrder[Slice[Byte]] =
    keyOrder match {
      case Left(bytesKeyOrder) =>
        bytesKeyOrder

      case Right(typedKeyOrder) =>
        new KeyOrder[Slice[Byte]] {
          override def compare(key1: Slice[Byte], key2: Slice[Byte]): Int = {
            val typedKey1 = serializer.read(key1)
            val typedKey2 = serializer.read(key2)
            typedKeyOrder.compare(typedKey1, typedKey2)
          }

          private[swaydb] override def comparableKey(key: Slice[Byte]): Slice[Byte] = {
            val typedData = serializer.read(key)
            val comparableKeyTyped = typedKeyOrder.comparableKey(typedData)
            serializer.write(comparableKeyTyped)
          }
        }
    }
}