Merge "Generic Mutable class for HIDL code."

am: 0f05ce94c3

Change-Id: I8ee4b650b96279efe26bdacb4d09a6a0317960e7

core/java/android/os/HidlSupport.java

@@ -85,6 +85,25 @@ public class HidlSupport {
         return lft.equals(rgt);
     }
 
+    /**
+     * Class which can be used to fetch an object out of a lambda. Fetching an object
+     * out of a local scope with HIDL is a common operation (although usually it can
+     * and should be avoided).
+     *
+     * @param <E> Inner object type.
+     */
+    public static final class Mutable<E> {
+        public E value;
+
+        public Mutable() {
+            value = null;
+        }
+
+        public Mutable(E value) {
+            this.value = value;
+        }
+    }
+
     /**
      * Similar to Arrays.deepHashCode, but also take care of lists.
      */