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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection.mutable
import Predef._
/** This class is used internally. It implements the mutable <code>Map</code>
* class in terms of three functions: <code>findEntry</code>,
* <code>addEntry</code>, and <code>entries</code>.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
trait DefaultMapModel[A, B] extends Map[A, B] {
type Entry = DefaultEntry[A, B]
protected def findEntry(key: A): Entry
protected def addEntry(e: Entry)
protected def entries: Iterator[Entry]
def get(key: A): Option[B] = {
val e = findEntry(key)
if (e == null) None
else Some(e.value);
}
def update(key: A, value: B) {
val e = findEntry(key)
if (e == null) addEntry(new Entry(key, value))
else e.value = value
}
def elements = entries map {e => (e.key, e.value)}
}
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