Merge "vibrator: Add Composition APIs"
diff --git a/libs/binder/include/binder/IInterface.h b/libs/binder/include/binder/IInterface.h
index 28ffa48..8d72a6b 100644
--- a/libs/binder/include/binder/IInterface.h
+++ b/libs/binder/include/binder/IInterface.h
@@ -38,12 +38,32 @@
// ----------------------------------------------------------------------
+/**
+ * If this is a local object and the descriptor matches, this will return the
+ * actual local object which is implementing the interface. Otherwise, this will
+ * return a proxy to the interface without checking the interface descriptor.
+ * This means that subsequent calls may fail with BAD_TYPE.
+ */
template<typename INTERFACE>
inline sp<INTERFACE> interface_cast(const sp<IBinder>& obj)
{
return INTERFACE::asInterface(obj);
}
+/**
+ * This is the same as interface_cast, except that it always checks to make sure
+ * the descriptor matches, and if it doesn't match, it will return nullptr.
+ */
+template<typename INTERFACE>
+inline sp<INTERFACE> checked_interface_cast(const sp<IBinder>& obj)
+{
+ if (obj->getInterfaceDescriptor() != INTERFACE::descriptor) {
+ return nullptr;
+ }
+
+ return interface_cast<INTERFACE>(obj);
+}
+
// ----------------------------------------------------------------------
template<typename INTERFACE>