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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: HashMap.scala 17715 2009-05-12 18:33:22Z odersky $
package scala.collection.mutable
import generic._
@serializable
class ListMap[A, B] extends Map[A, B] with MutableMapTemplate[A, B, ListMap[A, B]] {
override def empty = ListMap.empty[A, B]
private var elems: List[(A, B)] = List()
private var siz: Int = 0
def get(key: A): Option[B] = elems find (_._1 == key) map (_._2)
def elements: Iterator[(A, B)] = elems.elements
def += (kv: (A, B)) = { elems = remove(kv._1, elems); elems = kv :: elems; siz += 1; this }
def -= (key: A) = { elems = remove(key, elems); this }
private def remove(key: A, elems: List[(A, B)]): List[(A, B)] =
if (elems.isEmpty) elems
else if (elems.head._1 == key) { siz -= 1; elems.tail }
else elems.head :: remove(key, elems.tail)
override def clear() = elems = List()
override def size: Int = siz
}
/** This class implements mutable maps using a list.
*
* @author Martin Odersky
* @version 2.8
*/
object ListMap extends MutableMapFactory[ListMap] {
implicit def builderFactory[A, B]: BuilderFactory[(A, B), ListMap[A, B], Coll] = new MapBuilderFactory[A, B]
def empty[A, B]: ListMap[A, B] = new ListMap[A, B]
}
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