iteminfocache.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2007-05-01
 * Description : ItemInfo common data
 *
 * Copyright (C) 2007-2013 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 * Copyright (C) 2013-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * 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, 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.
 *
 * ============================================================ */
 
#ifndef DIGIKAM_ITEM_INFO_CACHE_H
#define DIGIKAM_ITEM_INFO_CACHE_H
 
// Qt includes
 
#include <QHash>
#include <QObject>
#include <QMultiHash>
#include <QExplicitlySharedDataPointer>
 
// Local includes
 
#include "coredbwatch.h"
 
namespace Digikam
{
 
class AlbumShortInfo;
class ItemInfoData;
 
// NOTE: No need to EXPORT this class
class ItemInfoCache : public QObject
{
    Q_OBJECT
 
public:
 
    ItemInfoCache();
    ~ItemInfoCache() override;
 
    QExplicitlySharedDataPointer<ItemInfoData> infoForId(qlonglong id);
 
    void dropInfo(const QExplicitlySharedDataPointer<ItemInfoData>& infoPtr);
 
    void cacheByName(const QExplicitlySharedDataPointer<ItemInfoData>& infoPtr);
 
    QExplicitlySharedDataPointer<ItemInfoData> infoForPath(int albumRootId,
                                                           const QString& relativePath,
                                                           const QString& name);
 
    QString albumRelativePath(int albumId);
 
    int getImageGroupedCount(qlonglong id);
 
    void invalidate();
 
private Q_SLOTS:
 
    void slotImageChanged(const ImageChangeset& changeset);
    void slotImageTagChanged(const ImageTagChangeset& changeset);
    void slotAlbumChange(const AlbumChangeset&);
 
private:
 
    // Disable
    explicit ItemInfoCache(QObject*) = delete;
 
    QList<AlbumShortInfo>::const_iterator findAlbum(int id);
    void                                  checkAlbums();
 
private:
 
    QMultiHash<QString, ItemInfoData*> m_nameHash;
    QHash<qlonglong, ItemInfoData*>    m_infoHash;
    QHash<ItemInfoData*, QString>      m_dataHash;
    volatile bool                      m_needUpdateAlbums;
    volatile bool                      m_needUpdateGrouped;
    QList<qlonglong>                   m_grouped;
    QList<AlbumShortInfo>              m_albums;
};
 
} // namespace Digikam
 
#endif // DIGIKAM_ITEM_INFO_CACHE_H