1 files changed, 63 insertions, 0 deletions
diff --git a/src/scalacheck/org/scalacheck/util/Buildable.scala b/src/scalacheck/org/scalacheck/util/Buildable.scala
new file mode 100644
index 0000000000..a41448ee94
--- /dev/null
+++ b/src/scalacheck/org/scalacheck/util/Buildable.scala
@@ -0,0 +1,63 @@
+/*-------------------------------------------------------------------------*\
+**  ScalaCheck                                                             **
+**  Copyright (c) 2007-2010 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 scala.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()
+  }
+}
+
+object Buildable {
+
+  implicit def buildableList[T] = new Buildable[T,List] {
+    def builder = new mutable.ListBuffer[T]
+  }
+
+  implicit def buildableStream[T] = new Buildable[T,Stream] {
+    def builder = (new mutable.ListBuffer[T]).mapResult(_.toStream)
+  }
+
+  implicit def buildableArray[T](implicit cm: ClassManifest[T]) =
+    new Buildable[T,Array] {
+      def builder = mutable.ArrayBuilder.make[T]
+    }
+
+  implicit def buildableMutableSet[T] = new Buildable[T,mutable.Set] {
+    def builder = new mutable.SetBuilder(mutable.Set.empty[T])
+  }
+
+  implicit def buildableImmutableSet[T] = new Buildable[T,immutable.Set] {
+    def builder = new mutable.SetBuilder(immutable.Set.empty[T])
+  }
+
+  implicit def buildableSet[T] = new Buildable[T,Set] {
+    def builder = new mutable.SetBuilder(Set.empty[T])
+  }
+
+  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
+    }
+  }
+
+}