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** packaging of this file. Please review the following information to
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#ifndef QHELPENGINECORE_H
#define QHELPENGINECORE_H

#include <QtHelp/qhelp_global.h>

#include <QtCore/QUrl>
#include <QtCore/QMap>
#include <QtCore/QObject>
#include <QtCore/QVariant>

QT_BEGIN_NAMESPACE

class QHelpEngineCorePrivate;
class QHelpFilterEngine;
struct QHelpLink;

class QHELP_EXPORT QHelpEngineCore : public QObject
{
    Q_OBJECT
    Q_PROPERTY(bool autoSaveFilter READ autoSaveFilter WRITE setAutoSaveFilter)
    Q_PROPERTY(QString collectionFile READ collectionFile WRITE setCollectionFile)
#if QT_DEPRECATED_SINCE(5, 15)
    Q_PROPERTY(QString currentFilter READ currentFilter WRITE setCurrentFilter)
#endif

public:
    explicit QHelpEngineCore(const QString &collectionFile, QObject *parent = nullptr);
    virtual ~QHelpEngineCore();

    QHelpFilterEngine *filterEngine() const;

    bool setupData();

    QString collectionFile() const;
    void setCollectionFile(const QString &fileName);

    bool copyCollectionFile(const QString &fileName);

    static QString namespaceName(const QString &documentationFileName);
    bool registerDocumentation(const QString &documentationFileName);
    bool unregisterDocumentation(const QString &namespaceName);
    QString documentationFileName(const QString &namespaceName);
    QStringList registeredDocumentations() const;
    QByteArray fileData(const QUrl &url) const;

#if QT_DEPRECATED_SINCE(5,13)
    QStringList customFilters() const;
    bool removeCustomFilter(const QString &filterName);
    bool addCustomFilter(const QString &filterName,
        const QStringList &attributes);

    QStringList filterAttributes() const;
    QStringList filterAttributes(const QString &filterName) const;

    QString currentFilter() const;
    void setCurrentFilter(const QString &filterName);

    QList<QStringList> filterAttributeSets(const QString &namespaceName) const;
    QList<QUrl> files(const QString namespaceName,
        const QStringList &filterAttributes,
        const QString &extensionFilter = QString());
#endif

    QList<QUrl> files(const QString namespaceName,
                      const QString &filterName,
                      const QString &extensionFilter = QString());
    QUrl findFile(const QUrl &url) const;

#if QT_DEPRECATED_SINCE(5, 15)
    QT_DEPRECATED_X("Use documentsForIdentifier() instead")
    QMap<QString, QUrl> linksForIdentifier(const QString &id) const;
    QT_DEPRECATED_X("Use documentsForKeyword() instead")
    QMap<QString, QUrl> linksForKeyword(const QString &keyword) const;
#endif

    QList<QHelpLink> documentsForIdentifier(const QString &id) const;
    QList<QHelpLink> documentsForIdentifier(const QString &id, const QString &filterName) const;
    QList<QHelpLink> documentsForKeyword(const QString &keyword) const;
    QList<QHelpLink> documentsForKeyword(const QString &keyword, const QString &filterName) const;

    bool removeCustomValue(const QString &key);
    QVariant customValue(const QString &key,
        const QVariant &defaultValue = QVariant()) const;
    bool setCustomValue(const QString &key, const QVariant &value);

    static QVariant metaData(const QString &documentationFileName,
        const QString &name);

    QString error() const;

    void setAutoSaveFilter(bool save);
    bool autoSaveFilter() const;

    void setUsesFilterEngine(bool uses);
    bool usesFilterEngine() const;

Q_SIGNALS:
    void setupStarted();
    void setupFinished();
    void warning(const QString &msg);

#if QT_DEPRECATED_SINCE(5,13)
    void currentFilterChanged(const QString &newFilter);
    void readersAboutToBeInvalidated();
#endif

protected:
    QHelpEngineCore(QHelpEngineCorePrivate *helpEngineCorePrivate,
        QObject *parent);

private:
    QHelpEngineCorePrivate *d;
    friend class QHelpEngineCorePrivate;
};

QT_END_NAMESPACE

#endif // QHELPENGINECORE_H