abstract_table_item.h

#pragma once
 
// Application headers
namespace ehm_dal::database {
class DatabaseVersion;
}
 
// Qt headers
class QDataStream;
#include <QVariant>
#include <type_traits>
 
namespace ehm_dal::schema {
 
template<typename T>
concept IntegralNumber = std::is_integral<T>::value;
 
// -- Table item/record --- //
class AbstractTableItem
{
public:
    AbstractTableItem();
    virtual ~AbstractTableItem();
 
    // File i/o
    virtual bool read(QDataStream &in, ehm_dal::database::DatabaseVersion &version);
    virtual bool write(QDataStream &out, ehm_dal::database::DatabaseVersion &version);
 
    // Initialisation
    inline virtual bool init() = 0;
 
protected:
    // Get data
    inline virtual bool deletable() const { return false; }
    template<IntegralNumber T>
    QVariant fromHexVector(const std::vector<T> &raw_data, const qint32 role) const;
    QVariant fromValue(const QVariant &value, const qint32 role) const;
};
 
// --- Get vector of numbers as a string --- //
template<IntegralNumber T>
QVariant AbstractTableItem::fromHexVector(const std::vector<T> &raw_data, const qint32 role) const
{
    if (role != Qt::DisplayRole)
        return QVariant();
 
    QStringList buffer;
    for (const auto &itr : raw_data)
        buffer << QString("%1").arg(static_cast<quint8>(itr), 2, 16, QLatin1Char('0'));
 
    return buffer.join(QStringLiteral(" "));
}
 
} // namespace ehm_dal::schema