Method loadCategories

src/frontend/datasources/ImportDatasetWidget.cpp:102–170

* @brief Processes the json metadata file that contains the list of categories and subcategories and their datasets. */

 * @brief Processes the json metadata file that contains the list of categories and subcategories and their datasets.
 */
void ImportDatasetWidget::loadCategories() {
	m_datasetsMap.clear();
	ui.cbCollections->clear();

	const QString collectionsFileName = m_jsonDir + QStringLiteral("/DatasetCollections.json");
	QFile file(collectionsFileName);

	if (file.open(QIODevice::ReadOnly)) {
		QJsonDocument document = QJsonDocument::fromJson(file.readAll());
		file.close();
		if (!document.isArray()) {
			QDEBUG(QStringLiteral("Invalid definition of ") + collectionsFileName);
			return;
		}

		m_collections = document.array();

		for (const QJsonValueRef col : m_collections) {
			const QJsonObject& collection = col.toObject();
			const QString& m_collection = collection[QLatin1String("name")].toString();

			QString path = m_jsonDir + QLatin1Char('/') + m_collection + QStringLiteral(".json");
			QFile collectionFile(path);
			if (collectionFile.open(QIODevice::ReadOnly)) {
				QJsonDocument collectionDocument = QJsonDocument::fromJson(collectionFile.readAll());
				if (!collectionDocument.isObject()) {
					QDEBUG(QStringLiteral("Invalid definition of ") + path);
					continue;
				}

				const QJsonObject& collectionObject = collectionDocument.object();
				const QJsonArray& categoryArray = collectionObject.value(QLatin1String("categories")).toArray();

				// processing categories
				for (const auto& cat : categoryArray) {
					const QJsonObject& currentCategory = cat.toObject();
					const QString& categoryName = currentCategory.value(QLatin1String("name")).toString();
					const QJsonArray& subcategories = currentCategory.value(QLatin1String("subcategories")).toArray();

					// processing subcategories
					for (const auto& sub : subcategories) {
						QJsonObject currentSubCategory = sub.toObject();
						QString subcategoryName = currentSubCategory.value(QLatin1String("name")).toString();
						const QJsonArray& datasetArray = currentSubCategory.value(QLatin1String("datasets")).toArray();

						// processing the datasets of the actual subcategory
						for (const auto& dataset : datasetArray)
							m_datasetsMap[m_collection][categoryName][subcategoryName].push_back(
								dataset.toObject().value(QLatin1String("filename")).toString());
					}
				}
			}
		}

		if (m_model)
			delete m_model;
		m_model = new DatasetModel(m_datasetsMap);