GDataDB support with leveldb.

chrome/browser/chromeos/gdata/gdata_leveldb.h

+// 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_