1 files changed, 42 insertions, 0 deletions
diff --git a/src/library/scala/collection/generic/ParallelMapFactory.scala b/src/library/scala/collection/generic/ParallelMapFactory.scala
new file mode 100644
index 0000000000..8f779b4029
--- /dev/null
+++ b/src/library/scala/collection/generic/ParallelMapFactory.scala
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+package scala.collection.generic
+
+
+
+import scala.collection.parallel.ParallelMap
+import scala.collection.parallel.ParallelMapLike
+import scala.collection.parallel.Combiner
+import scala.collection.mutable.Builder
+
+
+
+
+/** A template class for companion objects of `ParallelMap` and subclasses thereof.
+ *  This class extends `TraversableFactory` and provides a set of operations to create `$Coll` objects.
+ *
+ *  @define $coll parallel map
+ *  @define $Coll ParallelMap
+ */
+abstract class ParallelMapFactory[CC[X, Y] <: ParallelMap[X, Y] with ParallelMapLike[X, Y, CC[X, Y], _]]
+extends MapFactory[CC]
+   with GenericParallelMapCompanion[CC] {
+
+  type MapColl = CC[_, _]
+
+  /** The default builder for $Coll objects.
+   *  @tparam K      the type of the keys
+   *  @tparam V      the type of the associated values
+   */
+  override def newBuilder[K, V]: Builder[(K, V), CC[K, V]] = newCombiner[K, V]
+
+  /** The default combiner for $Coll objects.
+   *  @tparam K     the type of the keys
+   *  @tparam V     the type of the associated values
+   */
+  def newCombiner[K, V]: Combiner[(K, V), CC[K, V]]
+
+  class CanCombineFromMap[K, V] extends CanCombineFrom[CC[_, _], (K, V), CC[K, V]] {
+    def apply(from: MapColl) = from.genericMapCombiner[K, V].asInstanceOf[Combiner[(K, V), CC[K, V]]]
+    def apply() = newCombiner[K, V]
+  }
+
+}