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Scala example source code file (FreshNameCreator.scala)

This example Scala source code file (FreshNameCreator.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

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

The Scala FreshNameCreator.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2005-2011, 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("$" + counter + "$")
  }
}

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