Extension overhaul.

- Get rid of TypeLiteral<T>. It was introduced to read the component
  type of a List<T> at runtime. But we use arrays everywhere else,
  and we can always read the component type of an array type at
  runtime.
- Properly read/write "minor" types (e.g. sint32, sfixed32). The old
  implementation could only read/write data as the "typical" types
  (one per Java type), e.g. java.lang.Integer -> int32, java.lang.Long
  -> int64. So if e.g. an extension specifies sfixed32 as the type, it
  would be read/written in the totally incompatible int32 format.
- Properly serialize repeated packed fields. The old implementation
  doesn't do packed serialization. As an added bonus, and to be more
  aligned with the rest of protobuf nano / main, repeated packable
  extensions can deserialize both packed and non-packed data.
- Split Extension class into a hierarchy so under typical usage a
  large chunk of code dealing with primitive type extensions can be
  removed by ProGuard.

Bug: https://code.google.com/p/android/issues/detail?id=62586
Change-Id: I0d692f35cc2a8ad3a5a1cb3ce001282b2356b041

1 files changed, 2 insertions, 19 deletions

diff --git a/src/google/protobuf/unittest_extension_nano.proto b/src/google/protobuf/unittest_extension_nano.proto
index 104cfa7..0a775f4 100644
--- a/src/google/protobuf/unittest_extension_nano.proto
+++ b/src/google/protobuf/unittest_extension_nano.proto
@@ -18,31 +18,14 @@ message AnotherMessage {
   optional bool value = 2;
 }
 
-extend ExtendableMessage {
-  optional string some_string = 10;
-  optional int32 some_int = 11;
-  optional int64 some_long = 12;
-  optional float some_float = 13;
-  optional double some_double = 14;
-  optional bool some_bool = 15;
-  optional AnEnum some_enum = 16;
-  optional AnotherMessage some_message = 17;
-  repeated string some_repeated_string = 18;
-  repeated int32 some_repeated_int = 19;
-  repeated int64 some_repeated_long = 20;
-  repeated float some_repeated_float = 21;
-  repeated double some_repeated_double = 22;
-  repeated bool some_repeated_bool = 23;
-  repeated AnEnum some_repeated_enum = 24;
-  repeated AnotherMessage some_repeated_message = 25;
-}
-
 message ContainerMessage {
   extend ExtendableMessage {
     optional bool another_thing = 100;
   }
 }
 
+// For testNanoOptionalGroupWithUnknownFieldsEnabled;
+// not part of the extensions tests.
 message MessageWithGroup {
   optional group Group = 1 {
     optional int32 a = 2;