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AmdaParser.cpp
125 lines | 4.2 KiB | text/x-c | CppLexer
#include "AmdaParser.h"
#include "AmdaDefs.h"
#include <DataSource/DataSourceItem.h>
#include <QFile>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
Q_LOGGING_CATEGORY(LOG_AmdaParser, "AmdaParser")
namespace {
/// Returns the correct item type according to the key passed in parameter
DataSourceItemType itemType(const QString &key) noexcept
{
if (key == AMDA_PRODUCT_KEY) {
return DataSourceItemType::PRODUCT;
}
else if (key == AMDA_COMPONENT_KEY) {
return DataSourceItemType::COMPONENT;
}
else {
return DataSourceItemType::NODE;
}
}
/**
* Processes an entry of the JSON file to populate/create data source items
* @param jsonKey the entry's key
* @param jsonValue the entry's value
* @param item the current item for which the entry processing will be applied
* @param appendData flag indicating that the entry is part of an array. In the case of an array of
* values, each value will be concatenated to the others (rather than replacing the others)
*/
void parseEntry(const QString &jsonKey, const QJsonValue &jsonValue, DataSourceItem &item,
bool isArrayEntry = false)
{
if (jsonValue.isObject()) {
// Case of an object:
// - a new data source item is created and
// - parsing is called recursively to process the new item
// - the new item is then added as a child of the former item
auto object = jsonValue.toObject();
auto newItem = std::make_unique<DataSourceItem>(itemType(jsonKey));
for (auto it = object.constBegin(), end = object.constEnd(); it != end; ++it) {
parseEntry(it.key(), it.value(), *newItem);
}
item.appendChild(std::move(newItem));
}
else if (jsonValue.isArray()) {
// Case of an array: the item is populated with the arrays' content
auto object = jsonValue.toArray();
for (auto it = object.constBegin(), end = object.constEnd(); it != end; ++it) {
parseEntry(jsonKey, *it, item, true);
}
}
else {
// Case of a simple value: we add a data to the item. If the simple value is a part of an
// array, it is concatenated to the values already existing for this key
item.setData(jsonKey, jsonValue.toVariant(), isArrayEntry);
}
}
} // namespace
std::unique_ptr<DataSourceItem> AmdaParser::readJson(const QString &filePath) noexcept
{
QFile jsonFile{filePath};
if (!jsonFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
qCCritical(LOG_AmdaParser())
<< QObject::tr("Can't retrieve data source tree from file %1: %2")
.arg(filePath, jsonFile.errorString());
return nullptr;
}
auto json = jsonFile.readAll();
auto jsonDocument = QJsonDocument::fromJson(json);
// Check preconditions for parsing
if (!jsonDocument.isObject()) {
qCCritical(LOG_AmdaParser())
<< QObject::tr(
"Can't retrieve data source tree from file %1: the file is malformed (there is "
"not one and only one root object)")
.arg(filePath);
return nullptr;
}
auto jsonDocumentObject = jsonDocument.object();
if (!jsonDocumentObject.contains(AMDA_ROOT_KEY)) {
qCCritical(LOG_AmdaParser())
<< QObject::tr(
"Can't retrieve data source tree from file %1: the file is malformed (the key "
"for the root element was not found (%2))")
.arg(filePath, AMDA_ROOT_KEY);
return nullptr;
}
auto rootValue = jsonDocumentObject.value(AMDA_ROOT_KEY);
if (!rootValue.isObject()) {
qCCritical(LOG_AmdaParser())
<< QObject::tr(
"Can't retrieve data source tree from file %1: the file is malformed (the root "
"element is of the wrong type)")
.arg(filePath);
return nullptr;
}
// Makes the parsing
auto rootObject = rootValue.toObject();
auto rootItem = std::make_unique<DataSourceItem>(DataSourceItemType::NODE);
for (auto it = rootObject.constBegin(), end = rootObject.constEnd(); it != end; ++it) {
parseEntry(it.key(), it.value(), *rootItem);
}
return rootItem;
}