Add support for @nullable annotation

Using this annotation will now cause C++ types to be wrapped in
unique_ptr, and by extension be capable of handling null values.

Support extends to all arrays, Strings, Lists, and Parcelables.

Change-Id: I148a3666279c2badcba097b8925e55f8fcecb9c2
Test: Unit tests pass
Bug: 25969194
Signed-off-by: Casey Dahlin <sadmac@google.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/type_namespace.h b/type_namespace.h
index 453a1c2..e073c21 100644
--- a/type_namespace.h
+++ b/type_namespace.h
@@ -47,6 +47,7 @@ class ValidatableType {
   virtual bool CanWriteToParcel() const = 0;
 
   virtual const ValidatableType* ArrayType() const = 0;
+  virtual const ValidatableType* NullableType() const = 0;
 
   // Name() returns the short name of an object (without package qualifiers).
   virtual std::string Name() const { return type_name_; }
@@ -95,13 +96,13 @@ class TypeNamespace {
   virtual bool IsValidPackage(const std::string& package) const;
 
   // Returns true iff |raw_type| is a valid return type.
-  virtual bool IsValidReturnType(const AidlType& raw_type,
-                                 const std::string& filename) const;
+  virtual const ValidatableType* GetReturnType(const AidlType& raw_type,
+      const std::string& filename) const;
 
   // Returns true iff |arg_type| is a valid method argument.
-  virtual bool IsValidArg(const AidlArgument& a,
-                          int arg_index,
-                          const std::string& filename) const;
+  virtual const ValidatableType* GetArgType(const AidlArgument& a,
+                                            int arg_index,
+                                            const std::string& filename) const;
 
   // Returns true if this is a container type, rather than a normal type.
   virtual bool IsContainerType(const std::string& type_name) const;