Merge "Generic Mutable class for HIDL code." am: 0f05ce94c3 am: a4ac12c3ac

am: 98fa8b7eb0

Change-Id: I0062c37e0fe119ee31b8c72396e2be706a6469a5

1 files changed, 19 insertions, 0 deletions

diff --git a/core/java/android/os/HidlSupport.java b/core/java/android/os/HidlSupport.java
index a080c8dcbcc5..4d7d9319c94e 100644
--- a/core/java/android/os/HidlSupport.java
+++ b/core/java/android/os/HidlSupport.java
@@ -86,6 +86,25 @@ public class HidlSupport {
     }
 
     /**
+     * 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.
      */
     public static int deepHashCode(Object o) {