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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection.mutable
import Predef._
/** Class <code>Message</code> represents messages that are issued by observable
* collection classes whenever a data structure is changed. Class <code>Message</code>
* has several subclasses for the various kinds of events: <code>Update</code>
* <code>Remove</code>, <code>Include</code>, <code>Reset</code>, and
* <code>Script</code>.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
trait Message[+A]
/** This observable update refers to inclusion operations that add new elements
* to collection classes.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
case class Include[+I](elem: I) extends Message[I]
/** This observable update refers to destructive modification operations
* of elements from collection classes.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
case class Update[+A](elem: A) extends Message[A]
/** This observable update refers to removal operations of elements
* from collection classes.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
case class Remove[+A](elem: A) extends Message[A]
/** This command refers to reset operations.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
case class Reset[+A]() extends Message[A]
/** Objects of this class represent compound messages consisting
* of a sequence of other messages.
*
* @author Matthias Zenger
* @version 1.0, 10/05/2004
*/
class Script[A] extends ArrayBuffer[Message[A]] with Message[A] {
override def toString(): String = {
var res = "Script("
var it = elements
var i = 1
while (it.hasNext) {
if (i > 1)
res = res + ", "
res = res + "[" + i + "] " + it.next
i = i + 1
}
res + ")"
}
override def hashCode(): Int =
throw new UnsupportedOperationException("scripts are not suitable as hash keys")
}
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