1 files changed, 17 insertions, 0 deletions
diff --git a/bundle-plugin/src/main/scala/com/yahoo/container/plugin/util/Extractors.scala b/bundle-plugin/src/main/scala/com/yahoo/container/plugin/util/Extractors.scala
new file mode 100644
index 00000000000..9d51d7c6d6d
--- /dev/null
+++ b/bundle-plugin/src/main/scala/com/yahoo/container/plugin/util/Extractors.scala
@@ -0,0 +1,17 @@
+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.container.plugin.util
+
+/**
+* @author  tonytv
+*/
+object Extractors {
+  class ListOf[C](val c : Class[C]) {
+    def unapply[X](xs : X) : Option[List[C]] = {
+      xs match {
+        case x :: xr if c.isInstance(x) => unapply(xr) map ( c.cast(x) :: _)
+        case Nil => Some(Nil)
+        case _ => None
+      }
+    }
+  }
+}