Method statistics

src/backend/datasources/MQTTClient.cpp:823–885

! * \brief Returns the statistical data that is needed by the topic for its MQTTClient's will message * \param topic */

 * \param topic
 */
QString MQTTClient::statistics(const MQTTTopic* topic) const {
	const auto* col = topic->child<Column>(topic->childCount<Column>() - 1);
	QString statistics;

	QVector<bool> willStatistics = topic->mqttClient()->willStatistics();
	// Add every statistical data to the string, the flag of which is set true
	for (int i = 0; i <= willStatistics.size(); i++) {
		if (willStatistics[i]) {
			switch (static_cast<MQTTClient::WillStatisticsType>(i)) {
			case MQTTClient::WillStatisticsType::ArithmeticMean:
				statistics += QStringLiteral("Arithmetic mean: ") + QString::number(col->statistics().arithmeticMean) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::ContraharmonicMean:
				statistics += QStringLiteral("Contraharmonic mean: ") + QString::number(col->statistics().contraharmonicMean) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Entropy:
				statistics += QStringLiteral("Entropy: ") + QString::number(col->statistics().entropy) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::GeometricMean:
				statistics += QStringLiteral("Geometric mean: ") + QString::number(col->statistics().geometricMean) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::HarmonicMean:
				statistics += QStringLiteral("Harmonic mean: ") + QString::number(col->statistics().harmonicMean) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Kurtosis:
				statistics += QStringLiteral("Kurtosis: ") + QString::number(col->statistics().kurtosis) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Maximum:
				statistics += QStringLiteral("Maximum: ") + QString::number(col->statistics().maximum) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::MeanDeviation:
				statistics += QStringLiteral("Mean deviation: ") + QString::number(col->statistics().meanDeviation) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::MeanDeviationAroundMedian:
				statistics +=
					QStringLiteral("Mean deviation around median: ") + QString::number(col->statistics().meanDeviationAroundMedian) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Median:
				statistics += QStringLiteral("Median: ") + QString::number(col->statistics().median) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::MedianDeviation:
				statistics += QStringLiteral("Median deviation: ") + QString::number(col->statistics().medianDeviation) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Minimum:
				statistics += QStringLiteral("Minimum: ") + QString::number(col->statistics().minimum) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Skewness:
				statistics += QStringLiteral("Skewness: ") + QString::number(col->statistics().skewness) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::StandardDeviation:
				statistics += QStringLiteral("Standard deviation: ") + QString::number(col->statistics().standardDeviation) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::Variance:
				statistics += QStringLiteral("Variance: ") + QString::number(col->statistics().variance) + QStringLiteral("\n");
				break;
			case MQTTClient::WillStatisticsType::NoStatistics:
			default:
				break;