Initial check-in for message oneof.

src/google/protobuf/compiler/javanano/javanano_field.cc

@@ -111,6 +111,7 @@ FieldGenerator* FieldGeneratorMap::MakeGenerator(const FieldDescriptor* field,
   } else if (field->containing_oneof()) {
     switch (java_type) {
       case JAVATYPE_MESSAGE:
+        return new MessageOneofFieldGenerator(field, params);
       case JAVATYPE_ENUM:
       default:
         return new PrimitiveOneofFieldGenerator(field, params);

src/google/protobuf/compiler/javanano/javanano_message_field.cc

@@ -146,12 +146,22 @@ GenerateHashCodeCode(io::Printer* printer) const {
     "result = 31 * result +\n"
     "    (this.$name$ == null ? 0 : this.$name$.hashCode());\n");
 }
+// ===================================================================
+
+MessageOneofFieldGenerator::MessageOneofFieldGenerator(
+    const FieldDescriptor* descriptor, const Params& params)
+    : FieldGenerator(params), descriptor_(descriptor) {
+    SetMessageVariables(params, descriptor, &variables_);
+    SetCommonOneofVariables(descriptor, &variables_);
+}
+
+MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {}
 
 // ===================================================================
 
-RepeatedMessageFieldGenerator::
-RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor, const Params& params)
-  : FieldGenerator(params), descriptor_(descriptor) {
+RepeatedMessageFieldGenerator::RepeatedMessageFieldGenerator(
+    const FieldDescriptor* descriptor, const Params& params)
+    : FieldGenerator(params), descriptor_(descriptor) {
   SetMessageVariables(params, descriptor, &variables_);
 }
 

src/google/protobuf/compiler/javanano/javanano_message_field.h

@@ -66,6 +66,20 @@ class MessageFieldGenerator : public FieldGenerator {
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageFieldGenerator);
 };
 
+class MessageOneofFieldGenerator : public FieldGenerator {
+ public:
+  explicit MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
+                                      const Params& params);
+  ~MessageOneofFieldGenerator();
+
+  // implements FieldGenerator ---------------------------------------
+ private:
+  const FieldDescriptor* descriptor_;
+  map<string, string> variables_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageOneofFieldGenerator);
+};
+
 class RepeatedMessageFieldGenerator : public FieldGenerator {
  public:
   explicit RepeatedMessageFieldGenerator(const FieldDescriptor* descriptor,