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Scala example source code file (RevertibleHistory.scala)

This example Scala source code file (RevertibleHistory.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

history, history, pub, pub, revertiblehistory, serializable, undoable, undoable, unit, unit

The Scala RevertibleHistory.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.collection
package mutable


/** A revertible history is a `History` object which supports
 *  an undo operation. Type variable `Evt` refers to the type
 *  of the published events, `Pub` denotes the publisher type.
 *  Type `Pub` is typically a subtype of `Publisher`.
 *  
 *  @tparam Evt   type of the events
 *  @tparam Pub   type of the publisher
 *  
 *  @author  Matthias Zenger
 *  @version 1.0, 08/07/2003
 *  @since   2.8
 */
class RevertibleHistory[Evt <: Undoable, Pub] extends History[Evt, Pub] with Undoable with Serializable {

  /** Rollback the full history.
   */
  def undo(): Unit = {
    val old = log.toList.reverse
    clear
    old.foreach { case (sub, event) => event.undo }
  }
}

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