Nano support for extensions and unknown fields.

You can use the processor option store_unknown_fields to switch
this support on:

  aprotoc --javanano_out=store_unknown_fields=true:/tmp/out

A separate option for extensions isn't required. Support
for unknown fields must be turned on to allow storing and
retrieving extensions, because they are just stored as
unknown fields. If unknown fields are switched on, extension
related code will be generated when a proto message includes
an extension range, or an extension is encountered.

By default, store_unknown_fields is false. No additional
code is generated, and the generator will error out if protos
contain extension ranges or extensions.

Change-Id: I1e034c9e8f3305612953f72438189a7da6ed2167

1 files changed, 96 insertions, 0 deletions

diff --git a/src/google/protobuf/compiler/javanano/javanano_extension.cc b/src/google/protobuf/compiler/javanano/javanano_extension.cc
new file mode 100644
index 0000000..ea74af9
--- /dev/null
+++ b/src/google/protobuf/compiler/javanano/javanano_extension.cc
@@ -0,0 +1,96 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// http://code.google.com/p/protobuf/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Author: bduff@google.com (Brian Duff)
+
+#include <google/protobuf/compiler/javanano/javanano_extension.h>
+#include <google/protobuf/compiler/javanano/javanano_helpers.h>
+#include <google/protobuf/io/printer.h>
+#include <google/protobuf/stubs/strutil.h>
+#include <google/protobuf/wire_format.h>
+
+namespace google {
+namespace protobuf {
+namespace compiler {
+namespace javanano {
+
+using internal::WireFormat;
+
+void SetVariables(const FieldDescriptor* descriptor, const Params params,
+                  map<string, string>* variables) {
+  (*variables)["name"] = UnderscoresToCamelCase(descriptor);
+  (*variables)["number"] = SimpleItoa(descriptor->number());
+  (*variables)["extends"] = ClassName(params, descriptor->containing_type());
+
+  string type;
+  JavaType java_type = GetJavaType(descriptor->type());
+  switch (java_type) {
+    case JAVATYPE_ENUM:
+      type = "java.lang.Integer";
+      break;
+    case JAVATYPE_MESSAGE:
+      type = ClassName(params, descriptor->message_type());
+      break;
+    default:
+      type = BoxedPrimitiveTypeName(java_type);
+      break;
+  }
+  (*variables)["type"] = type;
+}
+
+ExtensionGenerator::
+ExtensionGenerator(const FieldDescriptor* descriptor, const Params& params)
+  : params_(params), descriptor_(descriptor) {
+  SetVariables(descriptor, params, &variables_);
+}
+
+ExtensionGenerator::~ExtensionGenerator() {}
+
+void ExtensionGenerator::Generate(io::Printer* printer) const {
+  if (descriptor_->is_repeated()) {
+    printer->Print(variables_,
+      "// Extends $extends$\n"
+      "public static final com.google.protobuf.nano.Extension<java.util.List<$type$>> $name$ = \n"
+      "    com.google.protobuf.nano.Extension.createRepeated($number$,\n"
+      "        new com.google.protobuf.nano.Extension.TypeLiteral<java.util.List<$type$>>(){});\n");
+  } else {
+    printer->Print(variables_,
+      "// Extends $extends$\n"
+      "public static final com.google.protobuf.nano.Extension<$type$> $name$ =\n"
+      "    com.google.protobuf.nano.Extension.create($number$,\n"
+      "        new com.google.protobuf.nano.Extension.TypeLiteral<$type$>(){});\n");
+  }
+}
+
+}  // namespace javanano
+}  // namespace compiler
+}  // namespace protobuf
+}  // namespace google
+