Add Checker Framework stub file for gRPC Context.Key. (#1357)

The stub file adds Nullable annotations to indicate that Context.Key.get can
return null when the key has no default or the key has a nullable value type.

1 files changed, 12 insertions, 0 deletions

diff --git a/checker-framework/stubs/grpc.astub b/checker-framework/stubs/grpc.astub
new file mode 100644
index 00000000..f8581eba
--- /dev/null
+++ b/checker-framework/stubs/grpc.astub
@@ -0,0 +1,12 @@
+package io.grpc;
+
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+class Context {
+  static <T> Key<@Nullable T> key(String name);
+  static <T> Key<T> keyWithDefault(String name, T defaultValue);
+  class Key<T> {
+    T get(Context context);
+    T get();
+  }
+}