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// 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_HISTORY_DOWNLOAD_DATABASE_H_
#define CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_
#include <string>
#include <vector>
#include "base/threading/platform_thread.h"
#include "sql/meta_table.h"
class FilePath;
namespace sql {
class Connection;
}
namespace history {
struct DownloadRow;
// Maintains a table of downloads.
class DownloadDatabase {
public:
// The value of |db_handle| indicating that the associated DownloadItem is not
// yet persisted.
static const int64 kUninitializedHandle;
// Must call InitDownloadTable before using any other functions.
DownloadDatabase();
virtual ~DownloadDatabase();
int next_download_id() const { return next_id_; }
// Get all the downloads from the database.
void QueryDownloads(
std::vector<DownloadRow>* results);
// Update the state of one download. Returns true if successful.
// Does not update |url|, |start_time|; uses |db_handle| only
// to select the row in the database table to update.
bool UpdateDownload(const DownloadRow& data);
// Fixes state of the download entries. Sometimes entries with IN_PROGRESS
// state are not updated during browser shutdown (particularly when crashing).
// On the next start such entries are considered canceled. This functions
// fixes such entries.
bool CleanUpInProgressEntries();
// Create a new database entry for one download and return its primary db id.
int64 CreateDownload(const DownloadRow& info);
// Remove |handle| from the database.
void RemoveDownload(int64 handle);
int CountDownloads();
protected:
// Returns the database for the functions in this interface.
virtual sql::Connection& GetDB() = 0;
// Returns the meta-table object for the functions in this interface.
virtual sql::MetaTable& GetMetaTable() = 0;
// Returns true if able to successfully rewrite the invalid values for the
// |state| field from 3 to 4. Returns false if there was an error fixing the
// database. See http://crbug.com/140687
bool MigrateDownloadsState();
// Creates the downloads table if needed.
bool InitDownloadTable();
// Used to quickly clear the downloads. First you would drop it, then you
// would re-initialize it.
bool DropDownloadTable();
private:
bool EnsureColumnExists(const std::string& name, const std::string& type);
bool owning_thread_set_;
base::PlatformThreadId owning_thread_;
int next_id_;
int next_db_handle_;
DISALLOW_COPY_AND_ASSIGN(DownloadDatabase);
};
} // namespace history
#endif // CHROME_BROWSER_HISTORY_DOWNLOAD_DATABASE_H_
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