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// Copyright (c) 2011 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_HISTORY_ARCHIVED_DATABASE_H_
#define CHROME_BROWSER_HISTORY_ARCHIVED_DATABASE_H_
#pragma once
#include "base/basictypes.h"
#include "chrome/browser/history/url_database.h"
#include "chrome/browser/history/visit_database.h"
#include "sql/connection.h"
#include "sql/init_status.h"
#include "sql/meta_table.h"
class FilePath;
namespace history {
// Encapsulates the database operations for archived history.
//
// IMPORTANT NOTE: The IDs in this system for URLs and visits will be
// different than those in the main database. This is to eliminate the
// dependency between them so we can deal with each one on its own.
class ArchivedDatabase : public URLDatabase,
public VisitDatabase {
public:
// Must call Init() before using other members.
ArchivedDatabase();
virtual ~ArchivedDatabase();
// Initializes the database connection. This must return true before any other
// functions on this class are called.
bool Init(const FilePath& file_name);
// Transactions on the database. We support nested transactions and only
// commit when the outermost one is committed (sqlite doesn't support true
// nested transactions).
void BeginTransaction();
void CommitTransaction();
private:
// Implemented for the specialized databases.
virtual sql::Connection& GetDB() OVERRIDE;
// Makes sure the version is up-to-date, updating if necessary. If the
// database is too old to migrate, the user will be notified. In this case, or
// for other errors, false will be returned. True means it is up-to-date and
// ready for use.
//
// This assumes it is called from the init function inside a transaction. It
// may commit the transaction and start a new one if migration requires it.
sql::InitStatus EnsureCurrentVersion();
// The database.
sql::Connection db_;
sql::MetaTable meta_table_;
DISALLOW_COPY_AND_ASSIGN(ArchivedDatabase);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_ARCHIVED_DATABASE_H_
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