RestoreManager: Make RestoreData into a struct with stream operators

This makes it possible to extend it while keeping backwards compatibility.

src/lib/app/mainapplication.cpp

@@ -429,12 +429,12 @@ void MainApplication::openSession(BrowserWindow* window, RestoreData &restoreDat
     if (window->tabWidget()->normalTabsCount() > 1) {
         // This can only happen when recovering crashed session!
         // Don't restore tabs in current window as user already opened some new tabs.
-        createWindow(Qz::BW_OtherRestoredWindow)->restoreWindow(restoreData.takeAt(0));
+        createWindow(Qz::BW_OtherRestoredWindow)->restoreWindow(restoreData.windows.takeAt(0));
     } else {
-        window->restoreWindow(restoreData.takeAt(0));
+        window->restoreWindow(restoreData.windows.takeAt(0));
     }
 
-    foreach (const BrowserWindow::SavedWindow &data, restoreData) {
+    foreach (const BrowserWindow::SavedWindow &data, restoreData.windows) {
         BrowserWindow* window = createWindow(Qz::BW_OtherRestoredWindow);
         window->restoreWindow(data);
     }
@@ -444,7 +444,7 @@ void MainApplication::openSession(BrowserWindow* window, RestoreData &restoreDat
 
 bool MainApplication::restoreSession(BrowserWindow* window, RestoreData restoreData)
 {
-    if (m_isPrivate || restoreData.isEmpty()) {
+    if (m_isPrivate || !restoreData.isValid()) {
         return false;
     }
 
@@ -724,15 +724,17 @@ void MainApplication::postLaunch()
 
 QByteArray MainApplication::saveState() const
 {
+    RestoreData restoreData;
+    restoreData.windows.reserve(m_windows.count());
+    for (BrowserWindow *window : qAsConst(m_windows)) {
+        restoreData.windows.append(BrowserWindow::SavedWindow(window));
+    }
+
     QByteArray data;
     QDataStream stream(&data, QIODevice::WriteOnly);
 
     stream << Qz::sessionVersion;
-    stream << m_windows.count();
-
-    for (BrowserWindow *window : qAsConst(m_windows)) {
-        stream << BrowserWindow::SavedWindow(window);
-    }
+    stream << restoreData;
 
     return data;
 }

src/lib/session/recoveryjsobject.cpp

@@ -45,7 +45,7 @@ QJsonArray RecoveryJsObject::restoreData() const
     QJsonArray out;
 
     int i = 0;
-    Q_FOREACH (const BrowserWindow::SavedWindow &w, m_manager->restoreData()) {
+    Q_FOREACH (const BrowserWindow::SavedWindow &w, m_manager->restoreData().windows) {
         int j = 0;
         QJsonArray tabs;
         Q_FOREACH (const WebTab::SavedTab &t, w.tabs) {
@@ -93,17 +93,17 @@ void RecoveryJsObject::restoreSession(const QStringList &excludeWin, const QStri
         int win = excludeWin.at(i).toInt();
         int tab = excludeTab.at(i).toInt();
 
-        if (!QzTools::containsIndex(data, win) || !QzTools::containsIndex(data.at(win).tabs, tab))
+        if (!QzTools::containsIndex(data.windows, win) || !QzTools::containsIndex(data.windows.at(win).tabs, tab))
             continue;
 
-        BrowserWindow::SavedWindow &wd = data[win];
+        BrowserWindow::SavedWindow &wd = data.windows[win];
 
         wd.tabs.remove(tab);
         if (wd.currentTab >= tab)
             --wd.currentTab;
 
         if (wd.tabs.isEmpty()) {
-            data.remove(win);
+            data.windows.remove(win);
             continue;
         }
 

src/lib/session/restoremanager.cpp

@@ -22,6 +22,48 @@
 
 #include <QFile>
 
+static const int restoreDataVersion = 0;
+
+bool RestoreData::isValid() const
+{
+    return !windows.isEmpty();
+}
+
+void RestoreData::clear()
+{
+    windows.clear();
+}
+
+QDataStream &operator<<(QDataStream &stream, const RestoreData &data)
+{
+    stream << data.windows.count();
+    for (const BrowserWindow::SavedWindow &window : qAsConst(data.windows)) {
+        stream << window;
+    }
+
+    stream << restoreDataVersion;
+
+    return stream;
+}
+
+QDataStream &operator>>(QDataStream &stream, RestoreData &data)
+{
+    int windowCount;
+    stream >> windowCount;
+    data.windows.reserve(windowCount);
+
+    for (int i = 0; i < windowCount; ++i) {
+        BrowserWindow::SavedWindow window;
+        stream >> window;
+        data.windows.append(window);
+    }
+
+    int version;
+    stream >> version;
+
+    return stream;
+}
+
 RestoreManager::RestoreManager(const QString &file)
     : m_recoveryObject(new RecoveryJsObject(this))
 {
@@ -40,7 +82,7 @@ RestoreData RestoreManager::restoreData() const
 
 bool RestoreManager::isValid() const
 {
-    return !m_data.isEmpty();
+    return m_data.isValid();
 }
 
 QObject *RestoreManager::recoveryObject(WebPage *page)
@@ -51,22 +93,14 @@ QObject *RestoreManager::recoveryObject(WebPage *page)
 
 static void loadCurrentVersion(QDataStream &stream, RestoreData &data)
 {
-    int windowCount;
-    stream >> windowCount;
-    data.reserve(windowCount);
-
-    for (int i = 0; i < windowCount; ++i) {
-        BrowserWindow::SavedWindow window;
-        stream >> window;
-        data.append(window);
-    }
+    stream >> data;
 }
 
 static void loadVersion3(QDataStream &stream, RestoreData &data)
 {
     int windowCount;
     stream >> windowCount;
-    data.reserve(windowCount);
+    data.windows.reserve(windowCount);
 
     for (int i = 0; i < windowCount; ++i) {
         QByteArray tabsState;
@@ -96,7 +130,7 @@ static void loadVersion3(QDataStream &stream, RestoreData &data)
         }
         stream2 >> window.currentTab;
 
-        data.append(window);
+        data.windows.append(window);
     }
 }
 

src/lib/session/restoremanager.h

@@ -25,7 +25,16 @@
 class WebPage;
 class RecoveryJsObject;
 
-using RestoreData = QVector<BrowserWindow::SavedWindow>;
+struct QUPZILLA_EXPORT RestoreData
+{
+    QVector<BrowserWindow::SavedWindow> windows;
+
+    bool isValid() const;
+    void clear();
+
+    friend QUPZILLA_EXPORT QDataStream &operator<<(QDataStream &stream, const RestoreData &data);
+    friend QUPZILLA_EXPORT QDataStream &operator>>(QDataStream &stream, RestoreData &data);
+};
 
 class FALKON_EXPORT RestoreManager
 {

src/lib/session/sessionmanager.cpp

@@ -90,7 +90,7 @@ void SessionManager::openSession(QString sessionFilePath, SessionFlags flags)
     RestoreData sessionData;
     RestoreManager::createFromFile(sessionFilePath, sessionData);
 
-    if (sessionData.isEmpty())
+    if (!sessionData.isValid())
         return;
 
     BrowserWindow* window = mApp->getWindow();