Revert 133815 - GDataDB support with leveldb.

* Define GDataDB interface with methods to Put, Get and Delete. Also define a path-based iterator.
* GDataLevelDB implements GDataDB using leveldb. 
* Add methods SerializeToString and FromProtoString to serialize GDataEntry to strings and vice versa.
* GDataDBTests test Put, Get, Delete for files and directories.
* Iterator tests in GDataDBTests.
* GDataDBFactory class to create GDataLevelDB instance.

TODO:
* There is no integration with GDataRootDirectory/GDataFileSystem yet.

BUG=chromium-os:29232
TEST=unittests pass.
Review URL: https://chromiumcodereview.appspot.com/10168025

TBR=achuith@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10214008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133819 0039d316-1c4b-4281-b951-d872f2087c98

10 files changed, 14 insertions, 736 deletions

diff --git a/chrome/browser/chromeos/gdata/gdata_db.h b/chrome/browser/chromeos/gdata/gdata_db.h
deleted file mode 100644
index 67d1e58..0000000
--- a/chrome/browser/chromeos/gdata/gdata_db.h
+++ /dev/null
@@ -1,69 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_
-#pragma once
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-
-class FilePath;
-
-namespace gdata {
-
-class GDataEntry;
-class GDataDBIter;
-
-// GData Database interface class.
-class GDataDB {
- public:
-  enum Status {
-    DB_OK = 0,
-    DB_KEY_NOT_FOUND,  // Key not found.
-    DB_CORRUPTION,  // Database file corrupt.
-    DB_IO_ERROR,  // File I/O error.
-    DB_INTERNAL_ERROR,
-  };
-
-  virtual ~GDataDB() {}
-
-  // Puts |entry| to the database.
-  virtual Status Put(const GDataEntry& entry) = 0;
-
-  // Deletes a database entry with key |resource_id| or |path| respectively.
-  virtual Status DeleteByResourceId(const std::string& resource_id) = 0;
-  virtual Status DeleteByPath(const FilePath& path) = 0;
-
-  // Fetches a GDataEntry* by key |resource_id| or |path| respectively.
-  virtual Status GetByResourceId(const std::string& resource_id,
-                                 scoped_ptr<GDataEntry>* entry) = 0;
-  virtual Status GetByPath(const FilePath& path,
-                           scoped_ptr<GDataEntry>* entry) = 0;
-
-  // Creates an iterator to fetch all GDataEntry's under |path|.
-  // Will not return NULL.
-  virtual scoped_ptr<GDataDBIter> CreateIterator(const FilePath& path) = 0;
-
- protected:
-  GDataDB() {}
-};
-
-// GData Database Iterator interface class.
-class GDataDBIter {
- public:
-  virtual ~GDataDBIter() {}
-
-  // Fetches the next |entry| in the iteration sequence. Returns false when
-  // there are no more entries.
-  virtual bool GetNext(std::string* path, scoped_ptr<GDataEntry>* entry) = 0;
-
- protected:
-  GDataDBIter() {}
-};
-
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_
diff --git a/chrome/browser/chromeos/gdata/gdata_db_factory.cc b/chrome/browser/chromeos/gdata/gdata_db_factory.cc
deleted file mode 100644
index 31c88ca..0000000
--- a/chrome/browser/chromeos/gdata/gdata_db_factory.cc
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/chromeos/gdata/gdata_db_factory.h"
-
-#include "base/file_path.h"
-#include "base/logging.h"
-#include "chrome/browser/chromeos/gdata/gdata_leveldb.h"
-
-namespace gdata {
-namespace db_factory {
-
-scoped_ptr<GDataDB> CreateGDataDB(const FilePath& db_path) {
-  DVLOG(1) << "CreateGDataDB " << db_path.value();
-  GDataLevelDB* level_db = new GDataLevelDB();
-  level_db->Init(db_path);
-  return scoped_ptr<GDataDB>(level_db);
-}
-
-}  // namespace db_factory
-}  // namespace gdata
diff --git a/chrome/browser/chromeos/gdata/gdata_db_factory.h b/chrome/browser/chromeos/gdata/gdata_db_factory.h
deleted file mode 100644
index ad88e1f..0000000
--- a/chrome/browser/chromeos/gdata/gdata_db_factory.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_FACTORY_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_FACTORY_H_
-#pragma once
-
-#include "base/memory/scoped_ptr.h"
-
-class FilePath;
-
-namespace gdata {
-
-class GDataDB;
-
-namespace db_factory {
-
-// Factory method to create an instance of GDataDB.
-scoped_ptr<GDataDB> CreateGDataDB(const FilePath& db_path);
-
-}  // namespace db_factory
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_FACTORY_H_
diff --git a/chrome/browser/chromeos/gdata/gdata_db_unittest.cc b/chrome/browser/chromeos/gdata/gdata_db_unittest.cc
deleted file mode 100644
index f35db48..0000000
--- a/chrome/browser/chromeos/gdata/gdata_db_unittest.cc
+++ /dev/null
@@ -1,266 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/chromeos/gdata/gdata_db.h"
-
-#include "base/string_number_conversions.h"
-#include "chrome/browser/chromeos/gdata/gdata_db_factory.h"
-#include "chrome/browser/chromeos/gdata/gdata_files.h"
-#include "testing/gtest/include/gtest/gtest.h"
-#include "chrome/test/base/testing_profile.h"
-
-namespace gdata {
-namespace {
-
-class GDataDBTest : public testing::Test {
- public:
-  GDataDBTest() {
-  }
-
-  virtual ~GDataDBTest() {
-  }
-
- protected:
-  // testing::Test implementation.
-  virtual void SetUp() OVERRIDE;
-
-  // Tests GDataDB::GetPath and GDataDB::ResourceId, ensuring that an entry
-  // matching |source| does not exist.
-  void TestGetNotFound(const GDataEntry& source);
-
-  // Tests GDataDB::GetPath and GDataDB::ResourceId, ensuring that an entry
-  // matching |source| exists.
-  void TestGetFound(const GDataEntry& source);
-
-  // Initialize the database with the following entries:
-  // dir1
-  // dir2
-  // dir1/dir3
-  // dir1/file4
-  // dir1/file5
-  // dir2/file6
-  // dir2/file7
-  // dir2/file8
-  // dir1/dir3/file9
-  // dir1/dir3/file10
-  void InitDB();
-
-  // Helper functions to add a directory/file, incrementing index.
-  GDataDirectory* AddDirectory(GDataDirectory* parent, int sequence_id);
-  GDataFile* AddFile(GDataDirectory* parent, int sequence_id);
-
-  // Tests GDataDB::NewIterator and GDataDBIter::GetNext.
-  // Creates an iterator with start at |parent|, and iterates comparing with
-  // expected |filenames|.
-  void TestIter(const std::string& parent,
-                const char* file_paths[],
-                size_t file_paths_size);
-
-  scoped_ptr<TestingProfile> profile_;
-  scoped_ptr<GDataDB> gdata_db_;
-  GDataRootDirectory root_;
-};
-
-void GDataDBTest::SetUp() {
-  profile_.reset(new TestingProfile());
-  gdata_db_ = db_factory::CreateGDataDB(
-      profile_->GetPath().Append("testdb"));
-}
-
-void GDataDBTest::TestGetNotFound(const GDataEntry& source) {
-  scoped_ptr<GDataEntry> entry;
-  GDataDB::Status status = gdata_db_->GetByPath(source.GetFilePath(), &entry);
-  EXPECT_EQ(GDataDB::DB_KEY_NOT_FOUND, status);
-  EXPECT_FALSE(entry.get());
-
-  status = gdata_db_->GetByResourceId(source.resource_id(), &entry);
-  EXPECT_EQ(GDataDB::DB_KEY_NOT_FOUND, status);
-  EXPECT_FALSE(entry.get());
-}
-
-void GDataDBTest::TestGetFound(const GDataEntry& source) {
-  scoped_ptr<GDataEntry> entry;
-  GDataDB::Status status = gdata_db_->GetByPath(source.GetFilePath(), &entry);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-  ASSERT_TRUE(entry.get());
-  EXPECT_EQ(source.file_name(), entry->file_name());
-  EXPECT_EQ(source.resource_id(), entry->resource_id());
-  EXPECT_EQ(source.content_url(), entry->content_url());
-  entry.reset();
-
-  status = gdata_db_->GetByResourceId(source.resource_id(), &entry);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-  ASSERT_TRUE(entry.get());
-  EXPECT_EQ(source.file_name(), entry->file_name());
-  EXPECT_EQ(source.resource_id(), entry->resource_id());
-  EXPECT_EQ(source.content_url(), entry->content_url());
-}
-
-void GDataDBTest::InitDB() {
-  int sequence_id = 1;
-  GDataDirectory* dir1 = AddDirectory(NULL, sequence_id++);
-  GDataDirectory* dir2 = AddDirectory(NULL, sequence_id++);
-  GDataDirectory* dir3 = AddDirectory(dir1, sequence_id++);
-
-  AddFile(dir1, sequence_id++);
-  AddFile(dir1, sequence_id++);
-
-  AddFile(dir2, sequence_id++);
-  AddFile(dir2, sequence_id++);
-  AddFile(dir2, sequence_id++);
-
-  AddFile(dir3, sequence_id++);
-  AddFile(dir3, sequence_id++);
-}
-
-GDataDirectory* GDataDBTest::AddDirectory(GDataDirectory* parent,
-                                          int sequence_id) {
-  GDataDirectory* dir = new GDataDirectory(parent ? parent : &root_, &root_);
-  const std::string dir_name = "dir" + base::IntToString(sequence_id);
-  const std::string resource_id = std::string("dir_resource_id:") +
-                                  dir_name;
-  dir->set_file_name(dir_name);
-  dir->set_resource_id(resource_id);
-  GDataDB::Status status = gdata_db_->Put(*dir);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-  DVLOG(1) << "AddDirectory " << dir->GetFilePath().value()
-           << ", " << resource_id;
-  return dir;
-}
-
-GDataFile* GDataDBTest::AddFile(GDataDirectory* parent,
-                                int sequence_id) {
-  GDataFile* file = new GDataFile(parent, &root_);
-  const std::string file_name = "file" + base::IntToString(sequence_id);
-  const std::string resource_id = std::string("file_resource_id:") +
-                                  file_name;
-  file->set_file_name(file_name);
-  file->set_resource_id(resource_id);
-  GDataDB::Status status = gdata_db_->Put(*file);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-  DVLOG(1) << "AddFile " << file->GetFilePath().value()
-           << ", " << resource_id;
-  return file;
-}
-
-void GDataDBTest::TestIter(const std::string& parent,
-                           const char* file_paths[],
-                           size_t file_paths_size) {
-  scoped_ptr<GDataDBIter> iter = gdata_db_->CreateIterator(
-      FilePath::FromUTF8Unsafe(parent));
-  for (size_t i = 0; ; ++i) {
-    scoped_ptr<GDataEntry> entry;
-    std::string path;
-    if (!iter->GetNext(&path, &entry)) {
-      EXPECT_EQ(i, file_paths_size);
-      break;
-    }
-    ASSERT_LT(i, file_paths_size);
-    // TODO(achuith): Also test entry->GetFilePath().
-    EXPECT_EQ(FilePath(file_paths[i]).BaseName().value(), entry->file_name());
-    EXPECT_EQ(file_paths[i], path);
-    DVLOG(1) << "Iter " << path;
-  }
-}
-
-}  // namespace
-
-TEST_F(GDataDBTest, PutTest) {
-  GDataDirectory* dir = new GDataDirectory(&root_, &root_);
-  dir->set_file_name("dir");
-  dir->set_resource_id("dir_resource_id");
-  dir->set_content_url(GURL("http://content/dir"));
-  dir->set_upload_url(GURL("http://upload/dir"));
-
-  TestGetNotFound(*dir);
-
-  GDataDB::Status status = gdata_db_->Put(*dir);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-
-  TestGetFound(*dir);
-
-  scoped_ptr<GDataEntry> entry;
-  gdata_db_->GetByPath(dir->GetFilePath(), &entry);
-  EXPECT_EQ(dir->upload_url(), entry->AsGDataDirectory()->upload_url());
-  EXPECT_TRUE(entry->AsGDataDirectory()->file_info().is_directory);
-
-  status = gdata_db_->DeleteByPath(dir->GetFilePath());
-  EXPECT_EQ(GDataDB::DB_OK, status);
-
-  TestGetNotFound(*dir);
-
-  GDataFile* file = new GDataFile(dir, &root_);
-  file->set_file_name("file1");
-  file->set_resource_id("file1_resource_id");
-  file->set_content_url(GURL("http://content/dir1/file1"));
-  file->set_file_md5("file1_md5");
-
-  TestGetNotFound(*file);
-
-  status = gdata_db_->Put(*file);
-  EXPECT_EQ(GDataDB::DB_OK, status);
-
-  TestGetFound(*file);
-
-  gdata_db_->GetByPath(file->GetFilePath(), &entry);
-  EXPECT_EQ(file->file_md5(), entry->AsGDataFile()->file_md5());
-  EXPECT_FALSE(entry->AsGDataFile()->file_info().is_directory);
-
-  status = gdata_db_->DeleteByPath(file->GetFilePath());
-  EXPECT_EQ(GDataDB::DB_OK, status);
-
-  TestGetNotFound(*file);
-}
-
-TEST_F(GDataDBTest, IterTest) {
-  InitDB();
-
-  const char* dir1_children[] = {
-    "dir1",
-    "dir1/dir3",
-    "dir1/dir3/file10",
-    "dir1/dir3/file9",
-    "dir1/file4",
-    "dir1/file5",
-  };
-  TestIter("dir1", dir1_children, arraysize(dir1_children));
-
-  const char* dir2_children[] = {
-    "dir2",
-    "dir2/file6",
-    "dir2/file7",
-    "dir2/file8",
-  };
-  TestIter("dir2", dir2_children, arraysize(dir2_children));
-
-  const char* dir3_children[] = {
-    "dir1/dir3",
-    "dir1/dir3/file10",
-    "dir1/dir3/file9",
-  };
-  TestIter("dir1/dir3", dir3_children, arraysize(dir3_children));
-
-  const char* file10[] = {
-    "dir1/dir3/file10",
-  };
-  TestIter(file10[0], file10, arraysize(file10));
-
-  const char* all_entries[] = {
-    "dir1",
-    "dir1/dir3",
-    "dir1/dir3/file10",
-    "dir1/dir3/file9",
-    "dir1/file4",
-    "dir1/file5",
-    "dir2",
-    "dir2/file6",
-    "dir2/file7",
-    "dir2/file8",
-  };
-  TestIter("", all_entries, arraysize(all_entries));
-
-  TestIter("dir4", NULL, 0);
-}
-
-}  // namespace gdata
diff --git a/chrome/browser/chromeos/gdata/gdata_files.cc b/chrome/browser/chromeos/gdata/gdata_files.cc
index 43a3cca..9dcd99a 100644
--- a/chrome/browser/chromeos/gdata/gdata_files.cc
+++ b/chrome/browser/chromeos/gdata/gdata_files.cc
@@ -78,20 +78,10 @@ GDataRootDirectory* GDataEntry::AsGDataRootDirectory() {
   return NULL;
 }
 
-const GDataFile* GDataEntry::AsGDataFileConst() const {
-  // cast away const and call the non-const version. This is safe.
-  return const_cast<GDataEntry*>(this)->AsGDataFile();
-}
-
-const GDataDirectory* GDataEntry::AsGDataDirectoryConst() const {
-  // cast away const and call the non-const version. This is safe.
-  return const_cast<GDataEntry*>(this)->AsGDataDirectory();
-}
-
-FilePath GDataEntry::GetFilePath() const {
+FilePath GDataEntry::GetFilePath() {
   FilePath path;
   std::vector<FilePath::StringType> parts;
-  for (const GDataEntry* entry = this; entry != NULL; entry = entry->parent_)
+  for (GDataEntry* entry = this; entry != NULL; entry = entry->parent())
     parts.push_back(entry->file_name());
 
   // Paste paths parts back together in reverse order from upward tree
@@ -143,7 +133,6 @@ GDataFile::GDataFile(GDataDirectory* parent, GDataRootDirectory* root)
     : GDataEntry(parent, root),
       kind_(gdata::DocumentEntry::UNKNOWN),
       is_hosted_document_(false) {
-  file_info_.is_directory = false;
 }
 
 GDataFile::~GDataFile() {
@@ -592,7 +581,6 @@ void GDataEntry::ToProto(GDataEntryProto* proto) const {
 }
 
 void GDataFile::FromProto(const GDataFileProto& proto) {
-  DCHECK(!proto.gdata_entry().file_info().is_directory());
   GDataEntry::FromProto(proto.gdata_entry());
   kind_ = DocumentEntry::EntryKind(proto.kind());
   thumbnail_url_ = GURL(proto.thumbnail_url());
@@ -607,7 +595,6 @@ void GDataFile::FromProto(const GDataFileProto& proto) {
 
 void GDataFile::ToProto(GDataFileProto* proto) const {
   GDataEntry::ToProto(proto->mutable_gdata_entry());
-  DCHECK(!proto->gdata_entry().file_info().is_directory());
   proto->set_kind(kind_);
   proto->set_thumbnail_url(thumbnail_url_.spec());
   proto->set_alternate_url(alternate_url_.spec());
@@ -620,7 +607,6 @@ void GDataFile::ToProto(GDataFileProto* proto) const {
 }
 
 void GDataDirectory::FromProto(const GDataDirectoryProto& proto) {
-  DCHECK(proto.gdata_entry().file_info().is_directory());
   GDataEntry::FromProto(proto.gdata_entry());
   refresh_time_ = base::Time::FromInternalValue(proto.refresh_time());
   start_feed_url_ = GURL(proto.start_feed_url());
@@ -641,7 +627,6 @@ void GDataDirectory::FromProto(const GDataDirectoryProto& proto) {
 
 void GDataDirectory::ToProto(GDataDirectoryProto* proto) const {
   GDataEntry::ToProto(proto->mutable_gdata_entry());
-  DCHECK(proto->gdata_entry().file_info().is_directory());
   proto->set_refresh_time(refresh_time_.ToInternalValue());
   proto->set_start_feed_url(start_feed_url_.spec());
   proto->set_next_feed_url(next_feed_url_.spec());
@@ -669,61 +654,18 @@ void GDataRootDirectory::ToProto(GDataRootDirectoryProto* proto) const {
   proto->set_largest_changestamp(largest_changestamp_);
 }
 
-void GDataEntry::SerializeToString(std::string* serialized_proto) const {
-  const GDataFile* file = AsGDataFileConst();
-  const GDataDirectory* dir = AsGDataDirectoryConst();
-
-  if (file) {
-    scoped_ptr<GDataFileProto> proto(new GDataFileProto());
-    file->ToProto(proto.get());
-    const bool ok = proto->SerializeToString(serialized_proto);
-    DCHECK(ok);
-  } else if (dir) {
-    scoped_ptr<GDataDirectoryProto> proto(new GDataDirectoryProto());
-    dir->ToProto(proto.get());
-    const bool ok = proto->SerializeToString(serialized_proto);
-    DCHECK(ok);
-  }
-}
-
-// static
-scoped_ptr<GDataEntry> GDataEntry::FromProtoString(
-    const std::string& serialized_proto) {
-  // First try to parse as GDataDirectoryProto. Note that this can succeed for
-  // a serialized_proto that's really a GDataFileProto - we have to check
-  // is_directory to be sure.
-  scoped_ptr<GDataDirectoryProto> dir_proto(new GDataDirectoryProto());
-  bool ok = dir_proto->ParseFromString(serialized_proto);
-  if (ok && dir_proto->gdata_entry().file_info().is_directory()) {
-    GDataDirectory* dir = new GDataDirectory(NULL, NULL);
-    dir->FromProto(*dir_proto);
-    return scoped_ptr<GDataEntry>(dir);
-  }
-
-  scoped_ptr<GDataFileProto> file_proto(new GDataFileProto());
-  ok = file_proto->ParseFromString(serialized_proto);
-  if (ok) {
-    DCHECK(!file_proto->gdata_entry().file_info().is_directory());
-    GDataFile* file = new GDataFile(NULL, NULL);
-    file->FromProto(*file_proto);
-    return scoped_ptr<GDataEntry>(file);
-  }
-  return scoped_ptr<GDataEntry>(NULL);
-}
-
-void GDataRootDirectory::SerializeToString(
-    std::string* serialized_proto) const {
+void GDataRootDirectory::SerializeToString(std::string* proto_string) const {
   scoped_ptr<GDataRootDirectoryProto> proto(
       new GDataRootDirectoryProto());
   ToProto(proto.get());
-  const bool ok = proto->SerializeToString(serialized_proto);
+  const bool ok = proto->SerializeToString(proto_string);
   DCHECK(ok);
 }
 
-bool GDataRootDirectory::ParseFromString(const std::string& serialized_proto) {
+bool GDataRootDirectory::ParseFromString(const std::string& proto_string) {
   scoped_ptr<GDataRootDirectoryProto> proto(
       new GDataRootDirectoryProto());
-  bool ok = proto->ParseFromString(serialized_proto);
+  bool ok = proto->ParseFromString(proto_string);
   if (ok) {
     FromProto(*proto.get());
     set_origin(FROM_CACHE);
diff --git a/chrome/browser/chromeos/gdata/gdata_files.h b/chrome/browser/chromeos/gdata/gdata_files.h
index 1944235..b7e9031 100644
--- a/chrome/browser/chromeos/gdata/gdata_files.h
+++ b/chrome/browser/chromeos/gdata/gdata_files.h
@@ -59,27 +59,15 @@ class GDataEntry {
  public:
   explicit GDataEntry(GDataDirectory* parent, GDataRootDirectory* root);
   virtual ~GDataEntry();
-
   virtual GDataFile* AsGDataFile();
   virtual GDataDirectory* AsGDataDirectory();
   virtual GDataRootDirectory* AsGDataRootDirectory();
 
-  // const versions of AsGDataFile and AsGDataDirectory.
-  const GDataFile* AsGDataFileConst() const;
-  const GDataDirectory* AsGDataDirectoryConst() const;
-
   // Converts DocumentEntry into GDataEntry.
   static GDataEntry* FromDocumentEntry(GDataDirectory* parent,
                                           DocumentEntry* doc,
                                           GDataRootDirectory* root);
 
-  // Serialize/Parse to/from string via proto classes.
-  // TODO(achuith): Correctly set up parent_ and root_ links in
-  // FromProtoString.
-  void SerializeToString(std::string* serialized_proto) const;
-  static scoped_ptr<GDataEntry> FromProtoString(
-      const std::string& serialized_proto);
-
   // Convert to/from proto.
   void FromProto(const GDataEntryProto& proto);
   void ToProto(GDataEntryProto* proto) const;
@@ -93,20 +81,20 @@ class GDataEntry {
 
   GDataDirectory* parent() { return parent_; }
   const base::PlatformFileInfo& file_info() const { return file_info_; }
-
   const FilePath::StringType& file_name() const { return file_name_; }
+  const FilePath::StringType& title() const {
+    return title_;
+  }
+  void set_title(const FilePath::StringType& title) {
+    title_ = title;
+  }
   void set_file_name(const FilePath::StringType& name) { file_name_ = name; }
 
-  const FilePath::StringType& title() const { return title_; }
-  void set_title(const FilePath::StringType& title) { title_ = title; }
-
   // The unique resource ID associated with this file system entry.
   const std::string& resource_id() const { return resource_id_; }
-  void set_resource_id(const std::string& res_id) { resource_id_ = res_id; }
 
   // The content URL is used for downloading regular files as is.
   const GURL& content_url() const { return content_url_; }
-  void set_content_url(const GURL& url) { content_url_ = url; }
 
   // The edit URL is used for removing files and hosted documents.
   const GURL& edit_url() const { return edit_url_; }
@@ -123,7 +111,7 @@ class GDataEntry {
   // Returns virtual file path representing this file system entry. This path
   // corresponds to file path expected by public methods of GDataFileSyste
   // class.
-  FilePath GetFilePath() const;
+  FilePath GetFilePath();
 
   // Sets |file_name_| based on the value of |title_| without name
   // de-duplication (see AddEntry() for details on de-duplication).
@@ -233,7 +221,6 @@ class GDataFile : public GDataEntry {
   const std::string& etag() const { return etag_; }
   const std::string& id() const { return id_; }
   const std::string& file_md5() const { return file_md5_; }
-  void set_file_md5(const std::string& file_md5) { file_md5_ = file_md5; }
   const std::string& document_extension() const { return document_extension_; }
   bool is_hosted_document() const { return is_hosted_document_; }
 
@@ -411,6 +398,7 @@ class GDataRootDirectory : public GDataDirectory {
   void set_serialized_size(size_t size) { serialized_size_ = size; }
 
   // GDataEntry implementation.
+
   virtual GDataRootDirectory* AsGDataRootDirectory() OVERRIDE;
 
   // Add the entry to resource map.
diff --git a/chrome/browser/chromeos/gdata/gdata_leveldb.cc b/chrome/browser/chromeos/gdata/gdata_leveldb.cc
deleted file mode 100644
index 1966627..0000000
--- a/chrome/browser/chromeos/gdata/gdata_leveldb.cc
+++ /dev/null
@@ -1,204 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/chromeos/gdata/gdata_leveldb.h"
-
-#include <string>
-
-#include "base/logging.h"
-#include "chrome/browser/chromeos/gdata/gdata_files.h"
-#include "leveldb/write_batch.h"
-
-namespace gdata {
-namespace {
-
-const char kResourceIdPrefix[] = "id:";
-const char kPathPrefix[] = "path:";
-
-// Append prefix id: to |resource_id|.
-std::string ResourceIdToKey(const std::string& resource_id) {
-  return std::string(kResourceIdPrefix) + resource_id;
-}
-
-// Append prefix path: to |path|.
-std::string PathToKey(const FilePath& path) {
-  return std::string(kPathPrefix) + path.value();
-}
-
-GDataDB::Status GetStatus(const leveldb::Status& db_status) {
-  if (db_status.ok())
-    return GDataDB::DB_OK;
-
-  if (db_status.IsNotFound())
-    return GDataDB::DB_KEY_NOT_FOUND;
-
-  if (db_status.IsCorruption())
-    return GDataDB::DB_CORRUPTION;
-
-  if (db_status.IsIOError())
-    return GDataDB::DB_IO_ERROR;
-
-  NOTREACHED();
-  return GDataDB::DB_INTERNAL_ERROR;
-}
-
-}  // namespace
-
-GDataLevelDB::GDataLevelDB() {
-}
-
-GDataLevelDB::~GDataLevelDB() {
-}
-
-void GDataLevelDB::Init(const FilePath& db_path) {
-  leveldb::DB* level_db = NULL;
-  leveldb::Options options;
-  options.create_if_missing = true;
-  leveldb::Status db_status = leveldb::DB::Open(options,
-      db_path.Append("level_db").value(), &level_db);
-  DCHECK(level_db);
-  // TODO(achuith): If db cannot be opened, we should try to recover it.
-  // If that fails, we should just delete it and create a new file.
-  DCHECK(db_status.ok());
-  level_db_.reset(level_db);
-}
-
-GDataDB::Status GDataLevelDB::Put(const GDataEntry& entry) {
-  // Write the serialized proto.
-  std::string serialized_proto;
-  entry.SerializeToString(&serialized_proto);
-
-  leveldb::WriteBatch batch;
-  const std::string resource_id_key =
-      ResourceIdToKey(entry.resource_id());
-  const std::string path_key = PathToKey(entry.GetFilePath());
-  batch.Put(leveldb::Slice(resource_id_key), leveldb::Slice(serialized_proto));
-  // Note we store the resource_id without prefix when it's the value.
-  batch.Put(leveldb::Slice(path_key), leveldb::Slice(entry.resource_id()));
-  leveldb::Status db_status = level_db_->Write(
-      leveldb::WriteOptions(),
-      &batch);
-
-  DVLOG(1) << "GDataLevelDB::Put resource_id key = " << resource_id_key
-           << ", path key = " << path_key;
-  return GetStatus(db_status);
-}
-
-GDataDB::Status GDataLevelDB::DeleteByResourceId(
-    const std::string& resource_id) {
-  scoped_ptr<GDataEntry> entry;
-  Status status = GetByResourceId(resource_id, &entry);
-  if (status == DB_KEY_NOT_FOUND)
-    return DB_OK;
-  else if (status != DB_OK)
-    return status;
-
-  leveldb::WriteBatch batch;
-  const std::string resource_id_key = ResourceIdToKey(resource_id);
-  const std::string path_key = PathToKey(entry->GetFilePath());
-  batch.Delete(leveldb::Slice(resource_id_key));
-  batch.Delete(leveldb::Slice(path_key));
-
-  leveldb::Status db_status = level_db_->Write(leveldb::WriteOptions(),
-                                               &batch);
-  return GetStatus(db_status);
-}
-
-GDataDB::Status GDataLevelDB::DeleteByPath(
-    const FilePath& path) {
-  std::string resource_id;
-  const Status status = ResourceIdForPath(path, &resource_id);
-  if (status != DB_OK)
-    return status;
-  return DeleteByResourceId(resource_id);
-}
-
-GDataDB::Status GDataLevelDB::GetByResourceId(const std::string& resource_id,
-                                              scoped_ptr<GDataEntry>* entry) {
-  entry->reset();
-  std::string serialized_proto;
-  const std::string resource_id_key = ResourceIdToKey(resource_id);
-  const leveldb::Status db_status = level_db_->Get(leveldb::ReadOptions(),
-      leveldb::Slice(resource_id_key), &serialized_proto);
-
-  if (db_status.IsNotFound())
-    return DB_KEY_NOT_FOUND;
-
-  if (db_status.ok()) {
-    DCHECK(!serialized_proto.empty());
-    *entry = GDataEntry::FromProtoString(serialized_proto);
-    DCHECK(entry->get());
-    return DB_OK;
-  }
-  return GetStatus(db_status);
-}
-
-GDataDB::Status GDataLevelDB::GetByPath(const FilePath& path,
-                                        scoped_ptr<GDataEntry>* entry) {
-  entry->reset();
-  std::string resource_id;
-  const Status status = ResourceIdForPath(path, &resource_id);
-  if (status != DB_OK)
-    return status;
-  return GetByResourceId(resource_id, entry);
-}
-
-GDataDB::Status GDataLevelDB::ResourceIdForPath(const FilePath& path,
-                                                std::string* resource_id) {
-  const std::string path_key = PathToKey(path);
-  const leveldb::Status db_status = level_db_->Get(
-      leveldb::ReadOptions(), path_key, resource_id);
-
-  return GetStatus(db_status);
-}
-
-scoped_ptr<GDataDBIter> GDataLevelDB::CreateIterator(const FilePath& path) {
-  return scoped_ptr<GDataDBIter>(new GDataLevelDBIter(
-      scoped_ptr<leveldb::Iterator>(
-          level_db_->NewIterator(leveldb::ReadOptions())),
-      this,
-      path));
-}
-
-GDataLevelDBIter::GDataLevelDBIter(scoped_ptr<leveldb::Iterator> level_db_iter,
-                                   GDataDB* db,
-                                   const FilePath& path)
-    : level_db_iter_(level_db_iter.Pass()),
-      db_(db),
-      path_(path) {
-  const std::string path_key = PathToKey(path);
-  level_db_iter_->Seek(leveldb::Slice(path_key));
-}
-
-GDataLevelDBIter::~GDataLevelDBIter() {
-}
-
-bool GDataLevelDBIter::GetNext(std::string* path,
-                               scoped_ptr<GDataEntry>* entry) {
-  DCHECK(path);
-  DCHECK(entry);
-  path->clear();
-  entry->reset();
-
-  if (!level_db_iter_->Valid())
-    return false;
-
-  // Only consider keys under |path|.
-  const std::string path_key = PathToKey(path_);
-  leveldb::Slice key_slice(level_db_iter_->key());
-  if (!key_slice.starts_with(path_key))
-    return false;
-
-  GDataDB::Status status =
-      db_->GetByResourceId(level_db_iter_->value().ToString(), entry);
-  DCHECK_EQ(GDataDB::DB_OK, status);
-
-  key_slice.remove_prefix(sizeof(kPathPrefix) - 1);
-  path->assign(key_slice.ToString());
-
-  level_db_iter_->Next();
-  return true;
-}
-
-}  // namespace gdata
diff --git a/chrome/browser/chromeos/gdata/gdata_leveldb.h b/chrome/browser/chromeos/gdata/gdata_leveldb.h
deleted file mode 100644
index e2385cc..0000000
--- a/chrome/browser/chromeos/gdata/gdata_leveldb.h
+++ /dev/null
@@ -1,60 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_LEVELDB_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_LEVELDB_H_
-#pragma once
-
-#include <leveldb/db.h>
-#include <string>
-
-#include "base/file_path.h"
-#include "chrome/browser/chromeos/gdata/gdata_db.h"
-
-namespace gdata {
-
-class GDataLevelDB : public GDataDB {
- public:
-  GDataLevelDB();
-
-  void Init(const FilePath& db_path);
-
- private:
-  virtual ~GDataLevelDB();
-
-  // GDataDB implementation.
-  virtual Status Put(const GDataEntry& file) OVERRIDE;
-  virtual Status DeleteByResourceId(const std::string& resource_id) OVERRIDE;
-  virtual Status DeleteByPath(const FilePath& path) OVERRIDE;
-  virtual Status GetByResourceId(const std::string& resource_id,
-                                 scoped_ptr<GDataEntry>* file) OVERRIDE;
-  virtual Status GetByPath(const FilePath& path,
-                           scoped_ptr<GDataEntry>* file) OVERRIDE;
-  virtual scoped_ptr<GDataDBIter> CreateIterator(const FilePath& path) OVERRIDE;
-
-  // Returns |resource_id| for |path| by looking up path_db_.
-  Status ResourceIdForPath(const FilePath& path, std::string* resource_id);
-
-  scoped_ptr<leveldb::DB> level_db_;
-};
-
-class GDataLevelDBIter : public GDataDBIter {
- public:
-  GDataLevelDBIter(scoped_ptr<leveldb::Iterator> level_db_iter,
-                   GDataDB* db, const FilePath& path);
- private:
-  virtual ~GDataLevelDBIter();
-
-  // GDataDBIter implementation.
-  virtual bool GetNext(std::string* path,
-                       scoped_ptr<GDataEntry>* entry) OVERRIDE;
-
-  scoped_ptr<leveldb::Iterator> level_db_iter_;
-  GDataDB* db_;
-  const FilePath path_;
-};
-
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_LEVELDB_H_
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 3e3d25d..76845ad 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -509,9 +509,6 @@
         'browser/chromeos/external_protocol_dialog.h',
         'browser/chromeos/gdata/gdata_auth_service.cc',
         'browser/chromeos/gdata/gdata_auth_service.h',
-        'browser/chromeos/gdata/gdata_db.h',
-        'browser/chromeos/gdata/gdata_db_factory.cc', 
-        'browser/chromeos/gdata/gdata_db_factory.h',
         'browser/chromeos/gdata/gdata_documents_service.cc',
         'browser/chromeos/gdata/gdata_documents_service.h',
         'browser/chromeos/gdata/gdata_download_observer.cc',
@@ -523,8 +520,6 @@
         'browser/chromeos/gdata/gdata_file_system_proxy.h',
         'browser/chromeos/gdata/gdata_files.cc',
         'browser/chromeos/gdata/gdata_files.h',
-        'browser/chromeos/gdata/gdata_leveldb.cc',
-        'browser/chromeos/gdata/gdata_leveldb.h',
         'browser/chromeos/gdata/gdata_operation_registry.cc',
         'browser/chromeos/gdata/gdata_operation_registry.h',
         'browser/chromeos/gdata/gdata_operations.cc',
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 15cff58..016a6bf 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1203,7 +1203,6 @@
         'browser/chromeos/dbus/proxy_resolution_service_provider_unittest.cc',
         'browser/chromeos/extensions/file_browser_notifications_unittest.cc',
         'browser/chromeos/external_metrics_unittest.cc',
-        'browser/chromeos/gdata/gdata_db_unittest.cc',
         'browser/chromeos/gdata/gdata_file_system_unittest.cc',
         'browser/chromeos/gdata/gdata_files_unittest.cc',
         'browser/chromeos/gdata/gdata_operation_registry_unittest.cc',