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Standard library for the Scala Programming Language
/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala
package collection
package mutable
import script._
/** This class is typically used as a mixin. It adds a subscription
* mechanism to the `Buffer` class into which this abstract
* class is mixed in. Class `ObservableBuffer` publishes
* events of the type `Message`.
*
* @author Matthias Zenger
* @since 1
*/
@deprecated("observables are deprecated because scripting is deprecated", "2.11.0")
trait ObservableBuffer[A] extends Buffer[A] with Publisher[Message[A] with Undoable] {
type Pub <: ObservableBuffer[A]
abstract override def +=(element: A): this.type = {
super.+=(element)
publish(new Include(End, element) with Undoable {
def undo() { trimEnd(1) }
})
this
}
abstract override def ++=(xs: TraversableOnce[A]): this.type = {
for (x <- xs) this += x
this
}
abstract override def +=:(element: A): this.type = {
super.+=:(element)
publish(new Include(Start, element) with Undoable {
def undo() { trimStart(1) }
})
this
}
abstract override def update(n: Int, newelement: A): Unit = {
val oldelement = apply(n)
super.update(n, newelement)
publish(new Update(Index(n), newelement) with Undoable {
def undo() { update(n, oldelement) }
})
}
abstract override def remove(n: Int): A = {
val oldelement = apply(n)
super.remove(n)
publish(new Remove(Index(n), oldelement) with Undoable {
def undo() { insert(n, oldelement) }
})
oldelement
}
abstract override def clear(): Unit = {
super.clear()
publish(new Reset with Undoable {
def undo() { throw new UnsupportedOperationException("cannot undo") }
})
}
abstract override def insertAll(n: Int, elems: scala.collection.Traversable[A]) {
super.insertAll(n, elems)
var curr = n - 1
val msg = elems.foldLeft(new Script[A]() with Undoable {
def undo() { throw new UnsupportedOperationException("cannot undo") }
}) {
case (msg, elem) =>
curr += 1
msg += Include(Index(curr), elem)
}
publish(msg)
}
}