1 files changed, 77 insertions, 0 deletions
diff --git a/src/partest-extras/scala/org/scalacheck/util/Buildable.scala b/src/partest-extras/scala/org/scalacheck/util/Buildable.scala
new file mode 100644
index 0000000000..6a275b05c2
--- /dev/null
+++ b/src/partest-extras/scala/org/scalacheck/util/Buildable.scala
@@ -0,0 +1,77 @@
+/*-------------------------------------------------------------------------*\
+**  ScalaCheck                                                             **
+**  Copyright (c) 2007-2014 Rickard Nilsson. All rights reserved.          **
+**  http://www.scalacheck.org                                              **
+**                                                                         **
+**  This software is released under the terms of the Revised BSD License.  **
+**  There is NO WARRANTY. See the file LICENSE for the full text.          **
+\*------------------------------------------------------------------------ */
+
+package org.scalacheck.util
+
+import collection._
+
+trait Buildable[T,C[_]] {
+  def builder: mutable.Builder[T,C[T]]
+  def fromIterable(it: Traversable[T]): C[T] = {
+    val b = builder
+    b ++= it
+    b.result()
+  }
+}
+
+trait Buildable2[T,U,C[_,_]] {
+  def builder: mutable.Builder[(T,U),C[T,U]]
+  def fromIterable(it: Traversable[(T,U)]): C[T,U] = {
+    val b = builder
+    b ++= it
+    b.result()
+  }
+}
+
+object Buildable {
+  import generic.CanBuildFrom
+
+  implicit def buildableCanBuildFrom[T, C[_]](implicit c: CanBuildFrom[C[_], T, C[T]]) = 
+    new Buildable[T, C] {
+      def builder = c.apply
+    }
+
+  import java.util.ArrayList
+  implicit def buildableArrayList[T] = new Buildable[T,ArrayList] {
+    def builder = new mutable.Builder[T,ArrayList[T]] {
+      val al = new ArrayList[T]
+      def +=(x: T) = {
+        al.add(x)
+        this
+      }
+      def clear() = al.clear()
+      def result() = al
+    }
+  }
+
+}
+
+object Buildable2 {
+  
+  implicit def buildableMutableMap[T,U] = new Buildable2[T,U,mutable.Map] {
+    def builder = mutable.Map.newBuilder
+  }
+
+  implicit def buildableImmutableMap[T,U] = new Buildable2[T,U,immutable.Map] {
+    def builder = immutable.Map.newBuilder
+  }
+
+  implicit def buildableMap[T,U] = new Buildable2[T,U,Map] {
+    def builder = Map.newBuilder
+  }
+
+  implicit def buildableImmutableSortedMap[T: Ordering, U] = new Buildable2[T,U,immutable.SortedMap] {
+    def builder = immutable.SortedMap.newBuilder
+  }
+
+  implicit def buildableSortedMap[T: Ordering, U] = new Buildable2[T,U,SortedMap] {
+    def builder = SortedMap.newBuilder
+  }
+
+}