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/*
This file is part of Akregator.
Copyright (C) 2005 Stanislav Karchebny <Stanislav.Karchebny@kdemail.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
As a special exception, permission is given to link this program
with any edition of Qt, and distribute the resulting executable,
without including the source code for Qt in the source distribution.
*/
#ifndef AKREGATOR_BACKEND_STORAGE_H
#define AKREGATOR_BACKEND_STORAGE_H
#include <qobject.h>
#include "akregator_export.h"
class QString;
class QStringList;
namespace Akregator {
namespace Backend {
class FeedStorage;
/** \brief Storage is the main interface to the article archive. It creates and manages FeedStorage objects handling the article list for a feed.
An archive implementation must implement Storage, FeedStorage and StorageFactory. See mk4storage for an example.
*/
class AKREGATOR_EXPORT Storage : public QObject
{
public:
static Storage* getInstance();
static void setInstance(Storage* instance);
virtual ~Storage() {}
/** initializes the storage object with given parameters */
virtual void initialize(const QStringList& params) = 0;
/**
* Open storage and prepare it for work.
* @return true on success.
*/
virtual bool open(bool autoCommit = false) = 0;
/**
* Commit changes made in feeds and articles, making them persistent.
* @return true on success.
*/
virtual bool commit() = 0;
/**
* Rollback changes made in feeds and articles, reverting to last committed values.
* @returns true on success.
*/
virtual bool rollback() = 0;
/**
* Closes storage, freeing all allocated resources. Called from destructor, so you don't need to call it directly.
* @return true on success.
*/
virtual bool close() = 0;
/**
* @return Article archive for feed at given url.
*/
virtual FeedStorage* archiveFor(const QString &url) = 0;
virtual bool autoCommit() const = 0;
virtual int unreadFor(const QString &url) = 0;
virtual void setUnreadFor(const QString &url, int unread) = 0;
virtual int totalCountFor(const QString &url) = 0;
virtual void setTotalCountFor(const QString &url, int total) = 0;
virtual int lastFetchFor(const QString& url) = 0;
virtual void setLastFetchFor(const QString& url, int lastFetch) = 0;
/** stores the feed list in the storage backend. This is a fallback for the case that the
feeds.opml file gets corrupted
@param opmlStr the feed list in OPML format
*/
virtual void storeFeedList(const QString& opmlStr) = 0;
virtual QString restoreFeedList() const = 0;
virtual void storeTagSet(const QString& xmlStr) = 0;
virtual QString restoreTagSet() const = 0;
/** returns a list of all feeds (URLs) stored in this archive */
virtual QStringList feeds() const = 0;
/** adds all feed storages from a source to this storage
existing articles are replaced
*/
virtual void add(Storage* source) = 0;
/** deletes all feed storages in this archive */
virtual void clear() = 0;
private:
static Storage *m_instance;
};
}
}
#endif
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