Scala example source code file (ReferenceWrapper.scala)

This example Scala source code file (ReferenceWrapper.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

anyref, anyref, none, none, nosuchelementexception, proxy, reference, referencewithwrapper, referencewithwrapper, referencewrapper, referencewrapper, some, t

The Scala ReferenceWrapper.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2006-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala.ref

/**
 *  @author Sean McDirmid
 */
trait ReferenceWrapper[+T <: AnyRef] extends Reference[T] with Proxy {
  val underlying: java.lang.ref.Reference[_ <: T]
  override def get = {
    val ret = underlying.get
    if (ret eq null) None else Some(ret)
  }
  def apply() = {
    val ret = underlying.get
    if (ret eq null) throw new NoSuchElementException
    ret
  }
  def clear = underlying.clear
  def enqueue = underlying.enqueue
  def isEnqueued = underlying.isEnqueued
  
  def self = underlying
}

/**
 *  @author Philipp Haller
 */
private trait ReferenceWithWrapper[T <: AnyRef] {
  val wrapper: ReferenceWrapper[T]
}