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Scala example source code file (SortedMapFactory.scala)

This example Scala source code file (SortedMapFactory.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, b, b, canbuildfrom, cc, cc, coll, mapbuilder, ordering, ordering, sortedmap, sortedmapfactory, sortedmaplike

The Scala SortedMapFactory.scala source code

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



package scala.collection
package generic

import mutable.{Builder, MapBuilder}

/** A template for companion objects of mutable.Map and subclasses thereof.
 *
 *  @since 2.8
 */
abstract class SortedMapFactory[CC[A, B] <: SortedMap[A, B] with SortedMapLike[A, B, CC[A, B]]] {

  type Coll = CC[_, _]

  def empty[A, B](implicit ord: Ordering[A]): CC[A, B]

  def apply[A, B](elems: (A, B)*)(implicit ord: Ordering[A]): CC[A, B] = (newBuilder[A, B](ord) ++= elems).result

  def newBuilder[A, B](implicit ord: Ordering[A]): Builder[(A, B), CC[A, B]] =
    new MapBuilder[A, B, CC[A, B]](empty(ord))

  class SortedMapCanBuildFrom[A, B](implicit ord: Ordering[A]) extends CanBuildFrom[Coll, (A, B), CC[A, B]] {
    def apply(from: Coll) = newBuilder[A, B](ord)
    def apply() = newBuilder[A, B]
  }
}

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