Scala example source code file (FreshNameCreator.scala)

This example Scala source code file (FreshNameCreator.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

actor, freshnamecreator, int, none, some, string, symbol

The FreshNameCreator.scala Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2005-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */


package scala.actors
package remote

object FreshNameCreator {

  protected var counter = 0
  protected val counters = new scala.collection.mutable.HashMap[String, Int]

  /**
   * Create a fresh name with the given prefix. It is guaranteed
   * that the returned name has never been returned by a previous
   * call to this function (provided the prefix does not end in a digit).
   */
  def newName(prefix: String): Symbol = {
    val count = counters.get(prefix) match {
      case Some(last) => last + 1
      case None => 0
    }
    counters.update(prefix, count)
    Symbol(prefix + count)
  }

  def newName(): Symbol = {
    counter += 1
    Symbol("$" + counter + "$")
  }
}