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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>Buffer</code> class into which this abstract
* class is mixed in. Class <code>ObservableBuffer</code> publishes
* events of the type <code>Message</code>.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
[_trait_] abstract class ObservableBuffer[A, This <: ObservableBuffer[A, This]]: This
extends Buffer[A]
with Publisher[Message[Pair[Location, A]] with Undoable, This] {
abstract override def +(element: A): Buffer[A] = {
super.+(element);
publish(new Include(Pair(End, element)) with Undoable {
def undo: Unit = trimEnd(1);
});
this
}
abstract override def +:(element: A): Buffer[A] = {
super.+:(element);
publish(new Include(Pair(Start, element)) with Undoable {
def undo: Unit = trimStart(1);
});
this
}
abstract override def insertAll(n: Int, iter: Iterable[A]): Unit = {
super.insertAll(n, iter);
var i = n;
val it = iter.elements;
while (it.hasNext) {
publish(new Include(Pair(Index(i), it.next)) with Undoable {
def undo: Unit = remove(i);
});
i = i + 1;
}
}
abstract override def update(n: Int, newelement: A): Unit = {
val oldelement = apply(n);
super.update(n, newelement);
publish(new Update(Pair(Index(n), newelement)) with Undoable {
def undo: Unit = update(n, oldelement);
});
}
abstract override def remove(n: Int): A = {
val oldelement = apply(n);
super.remove(n);
publish(new Remove(Pair(Index(n), oldelement)) with Undoable {
def undo: Unit = insert(n, oldelement);
});
oldelement
}
abstract override def clear: Unit = {
super.clear;
publish(new Reset with Undoable { def undo: Unit = error("cannot undo"); });
}
}
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