org.squeryl.internals.PosoLifecycleEvent.scala Maven / Gradle / Ivy

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A Scala ORM and DSL for talking with Databases using minimum verbosity and maximum type safety
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package org.squeryl.internals

import org.squeryl.{View, Schema}

object PosoLifecycleEvent extends Enumeration {
  type PosoLifeCycleEvent = Value
  val  BeforeInsert, AfterInsert,
       BeforeDelete, AfterDelete,
       BeforeUpdate, AfterUpdate,
       AfterSelect, Create = Value
}


class LifecycleEventInvoker(i:Iterable[LifecycleEvent], owner: View[_]) extends PosoLifecycleEventListener {

  import PosoLifecycleEvent._

  private val _beforeInsert = i.filter(_.e == BeforeInsert).map(_.callback)
  private val _afterInsert = i.filter(_.e == AfterInsert).map(_.callback)
  private val _beforeDelete = i.filter(_.e == BeforeDelete).map(_.callback)
  private val _afterDelete = i.filter(_.e == AfterDelete).map(_.callback)
  private val _beforeUpdate = i.filter(_.e == BeforeUpdate).map(_.callback)
  private val _afterUpdate = i.filter(_.e == AfterUpdate).map(_.callback)
  private val _afterSelect = i.filter(_.e == AfterSelect).map(_.callback)

  private val _factory: AnyRef=>AnyRef = {

    val f = i.filter(_.e == Create).map(_.callback)
    if(f.size > 1) org.squeryl.internals.Utils.throwError(owner.name + " has more than one factory defined.")
    f.headOption.getOrElse((r:AnyRef) => {null})
  }

  override def hasBeforeDelete = _beforeDelete != Nil
  override def hasAfterDelete = _afterDelete != Nil

  private def applyFuncs(fs: Traversable[AnyRef=>AnyRef], a: AnyRef) = {

    var res = a

    for(f <- fs) {
      res = f(res)
    }

    res
  }


  def create: AnyRef = _factory(null)

  def beforeInsert(a: AnyRef) = applyFuncs(_beforeInsert, a)
  def afterInsert(a: AnyRef) = applyFuncs(_afterInsert, a)
  def beforeDelete(a: AnyRef) = applyFuncs(_beforeDelete, a)
  def afterDelete(a: AnyRef) = applyFuncs(_afterDelete, a)
  def beforeUpdate(a: AnyRef) = applyFuncs(_beforeUpdate, a)
  def afterUpdate(a: AnyRef) = applyFuncs(_afterUpdate, a)
  def afterSelect(a: AnyRef) = applyFuncs(_afterSelect, a)
}

trait BaseLifecycleEventPercursor {

  protected def createLCEMap[A](t: Traversable[View[_]], e: PosoLifecycleEvent.Value, f: A=>A) =
    new LifecycleEvent(t, e, f.asInstanceOf[AnyRef=>AnyRef])

  protected def createLCECall[A](t: Traversable[View[_]], e: PosoLifecycleEvent.Value, f: A=>Unit) =
    createLCEMap[A](
      t,
      e,
      (ar:A) => {
        f(ar.asInstanceOf[A])
        ar
      }
    )
}

class PosoFactoryPercursorTable[A](target: View[_]) extends BaseLifecycleEventPercursor {
  def is(f: =>A) = new LifecycleEvent(Seq(target), PosoLifecycleEvent.Create,
    (r:AnyRef) => {
      val a = f
      a.asInstanceOf[AnyRef]
    }
  )
}

class LifecycleEventPercursorTable[A](target: View[_], e: PosoLifecycleEvent.Value) extends BaseLifecycleEventPercursor {

  def call(f:  A=>Unit) = createLCECall(Seq(target), e, f)

  def map(a:  A=>A) = createLCEMap(Seq(target), e, a)
}

class LifecycleEventPercursorClass[A](target: Class[_], schema: Schema, e: PosoLifecycleEvent.Value) extends BaseLifecycleEventPercursor {

  def call(f:  A=>Unit) = createLCECall(schema.findAllTablesFor(target), e, f)

  def map(a:  A=>A) = createLCEMap(schema.findAllTablesFor(target), e, a)

}

class LifecycleEvent(val target: Traversable[View[_]], val e: PosoLifecycleEvent.Value, val callback: AnyRef=>AnyRef)


trait PosoLifecycleEventListener {

  def hasBeforeDelete = false
  def hasAfterDelete = false
  def create: AnyRef
  def beforeInsert(a:AnyRef): AnyRef
  def afterInsert(a:AnyRef): AnyRef
  def beforeDelete(a:AnyRef): AnyRef
  def afterDelete(a:AnyRef): AnyRef
  def beforeUpdate(a:AnyRef): AnyRef
  def afterUpdate(a:AnyRef): AnyRef
  def afterSelect(a:AnyRef): AnyRef
}


object NoOpPosoLifecycleEventListener extends PosoLifecycleEventListener {
  def create: AnyRef = null
  def beforeInsert(a:AnyRef) = a
  def afterInsert(a:AnyRef) = a
  def beforeDelete(a:AnyRef) = a
  def afterDelete(a:AnyRef) = a
  def beforeUpdate(a:AnyRef) = a
  def afterUpdate(a:AnyRef) = a
  def afterSelect(a:AnyRef) = a
}