io.youi.persist.Persistence.scala Maven / Gradle / Ivy

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Core functionality leveraged and shared by most other sub-projects of YouI.

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package io.youi.persist

import io.circe.Json

trait Persistence[T] {
  protected def identifier: String
  protected def parentPersistence: Option[Persistence[_ >: T]]
  protected def create(): T
  protected def saveInfo(t: T): Json
  protected def loadInfo(t: T, json: Json): Unit

  def save(t: T): Json = {
    val identifierJson = Json.obj("identifier" -> Json.fromString(identifier))
    val parentJson = parentPersistence.map(_.save(t)).getOrElse(Json.obj())
    val json = saveInfo(t)
    parentJson.deepMerge(identifierJson).deepMerge(json)
  }

  def load(json: Json): T = {
    val t: T = create()
    parentPersistence.foreach(_.loadInfo(t, json))
    loadInfo(t, json)
    t
  }
}