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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2006, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.collection.mutable
/** This class is typically used as a mixin. It turns maps which map <code>A</code>
* to <code>Set[B]</code> objects into multi maps which map <code>A</code> to
* <code>B</code> objects.
*
* @author Matthias Zenger
* @version 1.0, 08/07/2003
*/
trait MultiMap[A, B] extends Map[A, Set[B]] {
protected def makeSet: Set[B] = new HashSet[B]
def add(key: A, value: B): Unit = get(key) match {
case None =>
val set = makeSet
set += value
this(key) = set
case Some(set) =>
set += value
}
def remove(key: A, value: B) = get(key) match {
case None =>
case Some(set) => set -= value
}
def entryExists(key: A, p: B => Boolean): Boolean = get(key) match {
case None => false
case Some(set) => set exists p
}
}
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