Add @Deprecated annotation support for proto file.

java/core/generate-test-sources-build.xml

@@ -19,6 +19,7 @@
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_enormous_descriptor.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_no_generic_services.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_well_known_types.proto"/>
+        <arg value="${test.proto.dir}/com/google/protobuf/deprecated_file.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/lazy_fields_lite.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/lite_equals_and_hash.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/multiple_files_test.proto"/>

java/core/src/test/proto/com/google/protobuf/deprecated_file.proto

+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// 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.
+
+syntax = "proto3";
+
+package deprecated_file;
+
+option deprecated = true;

src/google/protobuf/compiler/java/java_file.cc

@@ -248,9 +248,12 @@ void FileGenerator::Generate(io::Printer* printer) {
   PrintGeneratedAnnotation(
       printer, '$', options_.annotate_code ? classname_ + ".java.pb.meta" : "");
   printer->Print(
-      "public final class $classname$ {\n"
+      "$deprecation$public final class $classname$ {\n"
       "  private $ctor$() {}\n",
-      "classname", classname_, "ctor", classname_);
+      "deprecation", file_->options().deprecated() ?
+          "@java.lang.Deprecated " : "",
+      "classname", classname_,
+      "ctor", classname_);
   printer->Annotate("classname", file_->name());
   printer->Indent();