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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
** $Id$
\* */
package scala.collection.mutable;
/** This class is typically used as a mixin. It adds a subscription
* mechanism to the <code>Set</code> class into which this abstract
* class is mixed in. Class <code>ObservableSet</code> publishes
* events of the type <code>Message</code>.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
mixin class ObservableSet[A, This <: ObservableSet[A, This]]
requires This
extends scala.collection.mutable.Set[A]
with Publisher[Message[A] with Undoable, This] {
abstract override def +=(elem: A): Unit = if (!contains(elem)) {
super.+=(elem);
publish(new Include(elem) with Undoable { def undo = -=(elem); });
}
abstract override def -=(elem: A): Unit = if (contains(elem)) {
super.-=(elem);
publish(new Remove(elem) with Undoable { def undo = +=(elem); });
}
abstract override def clear: Unit = {
super.clear;
publish(new Reset with Undoable { def undo: Unit = error("cannot undo"); });
}
}
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