def outerClassesOf()

in chill-scala/src/main/scala/com/twitter/chill/ClosureCleaner.scala [96:115]

• 12 lines of code
• 3 McCabe index (conditional complexity)

  def outerClassesOf(cls: Class[_]): List[Class[_]] =
    outerClassHier.getOrElseUpdate(cls, getOuterClassesFn(cls))

  /**
   * returns the (Class, AnyRef) pair from highest level to lowest level so result.last is the outer of obj.
   */
  @tailrec
  def getOutersOf(obj: AnyRef, hierarchy: List[(Class[_], AnyRef)] = Nil): List[(Class[_], AnyRef)] =
    outerFieldOf(obj.getClass) match {
      case None    => hierarchy // We have finished
      case Some(f) =>
        // f is the $outer of obj
        f.setAccessible(true)
        // myOuter = obj.$outer
        val myOuter = f.get(obj)
        // This is (Class[T], T) into the hierarchy:
        // Note that if you use f.getType you might get an interface. No good
        val outerType = myOuter.getClass
        getOutersOf(myOuter, (outerType, myOuter) :: hierarchy)
    }