Added MediaGalleryDatabase

chrome/browser/media_gallery/media_gallery_database.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_MEDIA_GALLERY_MEDIA_GALLERY_DATABASE_H_
+#define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_GALLERY_DATABASE_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "chrome/browser/media_gallery/media_gallery_database_types.h"
+#include "sql/connection.h"
+#include "sql/init_status.h"
+#include "sql/meta_table.h"
+
+namespace chrome {
+
+// Encapsulates the SQL database that stores pre-parsed media gallery metadata
+// for search and retrieval.
+class MediaGalleryDatabase {
+ public:
+  MediaGalleryDatabase();
+  virtual ~MediaGalleryDatabase();
+
+  // Must call this function to complete initialization. Will return true on
+  // success. On false, no other function should be called.
+  sql::InitStatus Init(const FilePath& database_path);
+
+  // Returns the current version that we will generate media gallery databases
+  // with.
+  static int GetCurrentVersion();
+
+  // Sets the id field of the input collection_row to the generated unique
+  // key value and returns the same. On failure, returns zero.
+  int CreateCollectionRow(CollectionRow* collection_row);
+
+  // Finds the row with the specified id and fills its data into the collection
+  // pointer passed by the caller. Returns true on success.
+  bool GetCollectionRow(CollectionId id, CollectionRow* collection);
+
+ protected:
+  virtual sql::Connection& GetDB();
+
+  // Initializes an already open database.
+  sql::InitStatus InitInternal(sql::Connection* db);
+  static bool DoesCollectionsTableExist(sql::Connection* db);
+
+ private:
+  static bool CreateCollectionsTable(sql::Connection* db);
+  sql::InitStatus EnsureCurrentVersion();
+  void FillCollectionRow(const sql::Statement& statement, CollectionRow* row);
+
+  sql::Connection db_;
+  sql::MetaTable meta_table_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaGalleryDatabase);
+};
+
+}  // namespace chrome
+
+std::ostream& operator<<(std::ostream& out, const chrome::CollectionRow& row);
+
+#endif  // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_GALLERY_DATABASE_H_