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Scala example source code file (Message.scala)

This example Scala source code file (Message.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

a, a, arraybuffer, include, location, location, message, message, remove, reset, script, script, string, update

The Scala Message.scala source code

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



package scala.collection
package script

import mutable.ArrayBuffer

/** Class <code>Message represents messages that are issued by observable
 *  collection classes whenever a data structure is changed. Class <code>Message
 *  has several subclasses for the various kinds of events: <code>Update
 *  <code>Remove, Include, Reset, and
 *  <code>Script.
 *
 *  @author  Matthias Zenger
 *  @version 1.0, 08/07/2003
 *  @since   2.8
 */
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[+A](location: Location, elem: A) extends Message[A] {
  def this(elem: A) = this(NoLo, elem)
}

/** 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](location: Location, elem: A) extends Message[A] {
  def this(elem: A) = this(NoLo, elem)
}

/** 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](location: Location, elem: A) extends Message[A] {
  def this(elem: A) = this(NoLo, elem)
}

/** 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 = this.iterator
    var i = 1
    while (it.hasNext) {
      if (i > 1)
        res = res + ", "
      res = res + "[" + i + "] " + it.next
      i = i + 1
    }
    res + ")"
  }
}

Other Scala examples (source code examples)

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