Add persistentData to store dc-fw-version

Reading dc-fw-version is somehow complicated ...
Id does not work reliable on startup, so we do read it also on every
diagRequest().
Version string is then stored in persistent data.
This data can be used e.g. by other tools to show the
device-controller-firmware-version.

src/ATBAPP/support/PersistentData.cpp

@@ -0,0 +1,137 @@
+#include "PersistentData.h"
+
+#include <QFile>
+#include <QFileInfo>
+#include <QDir>
+#include <QDateTime>
+#include <QDataStream>
+#include <QDebug>
+
+PersistentData::PersistentData(const QString &datafileName, QObject *parent)
+    : QObject(parent)
+    , isChangedFlag(false)
+{
+    // load persistant data, if available
+    this->filename = datafileName;
+
+    QFileInfo dataFileInfo(this->filename);
+    QString dataFilePath = dataFileInfo.path();
+
+    QDir dir;
+    if ( ! dir.exists(dataFilePath)) {
+        qCritical() << "Persistent data file does not exist!";
+        qCritical() << "          --> create new: " << this->filename;
+        dir.mkpath(dataFilePath);
+    }
+
+    this->read();
+}
+
+
+void PersistentData::serializeToFile()
+{
+    this->save();
+}
+
+void PersistentData::save()
+{
+    QFile fileOut(this->filename);
+    if (fileOut.open(QIODevice::WriteOnly))
+    {
+        QDataStream out(&fileOut);
+        out.setVersion(QDataStream::Qt_4_6);
+
+        out << this->hash;
+        fileOut.flush();
+        fileOut.close();
+    }
+}
+
+void PersistentData::read()
+{
+    QFile fileIn(this->filename);
+    if (fileIn.open(QIODevice::ReadOnly))
+    {
+        QDataStream in(&fileIn);
+        in.setVersion(QDataStream::Qt_4_6);
+
+        in >> hash;
+
+        fileIn.close();
+    }
+}
+
+
+
+QVariant PersistentData::getParameter(const QString & key) const {
+#if defined (ARCH_DesktopLinux)
+    // note: QVariant.toString() returns empty string for custom types
+    qDebug() << "VendingData::getParameter() key = " << key << " value = " << hash.value(key).toString();
+#endif
+    return hash.value(key);
+}
+
+QVariant PersistentData::getParameter(const QString & key)
+{
+    #if defined (ARCH_DesktopLinux)
+    // note: QVariant.toString() returns empty string for custom types
+    qDebug() << "VendingData::getParameter() key = " << key << " value = " << hash.value(key).toString();
+    #endif
+
+    return hash.value(key);
+}
+
+void PersistentData::setParameter(const QString & key, QVariant value)
+{
+    this->isChangedFlag = true;
+
+    #if defined (ARCH_DesktopLinux)
+    // note: QVariant.toString() returns empty string for custom types
+    qDebug() << "VendingData::setParameter() key = " << key << " value = " << value.toString();
+    #endif
+
+    this->hash.insert(key, value);
+}
+
+void PersistentData::clearParameter(const QString & key)
+{
+    this->isChangedFlag = true;
+    this->hash.remove(key);
+}
+
+bool PersistentData::hasParameter(const QString & key) const
+{
+    return hash.contains(key);
+}
+
+
+uint PersistentData::getUintParameter(const QString & key) const
+{
+    qDebug() << "PersistentData::getUintParameter() key = " << key << " value = " << hash.value(key).toString();
+
+    uint returnValue = 0;
+    bool ok;
+
+    returnValue = hash.value(key).toString().toUInt(&ok);
+    if (!ok) returnValue = 0;
+
+    return returnValue;
+}
+
+QList<QString> PersistentData::uniqueKeys() const {
+    return hash.uniqueKeys();
+}
+
+
+void PersistentData::setDCFirmwareVersion(const QString & fw_version)
+{
+    if (this->hash["dc_fw_version"].toString() != fw_version) {
+        this->isChangedFlag = true;
+        this->hash.insert("dc_fw_version", fw_version);
+    }
+}
+
+QString PersistentData::getDCFirmwareVersion()
+{
+    return this->hash["dc_fw_version"].toString();
+}

src/ATBAPP/support/PersistentData.h

@@ -0,0 +1,49 @@
+#ifndef PERSISTENTDATA_H
+#define PERSISTENTDATA_H
+
+#include <QObject>
+#include <QHash>
+#include <QVariant>
+#include <QList>
+#include <QString>
+
+class PersistentData : public QObject
+{
+    Q_OBJECT
+public:
+    explicit PersistentData(const QString &datafileName, QObject *parent = nullptr);
+
+    void setDCFirmwareVersion(const QString & fw_version);
+    QString getDCFirmwareVersion();
+
+
+    QVariant getParameter(const QString & key);
+    QVariant getParameter(const QString & key) const;
+    void setParameter(const QString & key, QVariant value);
+    void clearParameter(const QString & key);
+    bool hasParameter(const QString & key) const;
+
+    uint getUintParameter(const QString & key) const;
+    QList<QString> uniqueKeys() const;
+
+
+public slots:
+    void serializeToFile();
+
+signals:
+
+
+private:
+    QHash<QString, QVariant> hash;
+
+    QString dc_fw_version;
+
+    QString filename;
+
+    void save();
+    void read();
+
+    bool isChangedFlag;
+};
+
+#endif // PERSISTENTDATA_H