Dump service was added

services/dumpservice.cpp

@@ -0,0 +1,62 @@
+#include "dumpservice.h"
+
+#include <QFile>
+#include <QJsonDocument>
+#include <QJsonArray>
+#include <QJsonObject>
+#include <QStandardPaths>
+
+void DumpService::setEntityName(const QString &name)
+{
+    m_entityName = name;
+}
+
+void DumpService::dump(const QVariant &data) const
+{
+    QFile stash(dumpFileName());
+    if (stash.open(QIODevice::WriteOnly)) {
+        stash.write(QJsonDocument::fromVariant(data).toJson(QJsonDocument::Compact));
+        stash.close();
+    } else {
+        qWarning() << stash.errorString();
+    }
+}
+
+QVariantList DumpService::loadList() const
+{
+    QJsonDocument dump = readFile();
+    return dump.array().toVariantList();
+}
+
+QVariantMap DumpService::loadMap() const
+{
+    QJsonDocument dump = readFile();
+    return dump.object().toVariantMap();
+}
+
+void DumpService::clear() const
+{
+    QFile::remove(dumpFileName());
+}
+
+QString DumpService::dumpFileName() const
+{
+    Q_ASSERT(!m_entityName.isEmpty());
+
+    return QString("%1/%2.dump").arg(QStandardPaths::writableLocation(QStandardPaths::CacheLocation), m_entityName);
+}
+
+QJsonDocument DumpService::readFile() const
+{
+    QJsonDocument res;
+
+    QFile dump(dumpFileName());
+    if (dump.open(QIODevice::ReadOnly)) {
+        res = QJsonDocument::fromJson(dump.readAll());
+        dump.close();
+    } else {
+        qWarning() << dump.errorString();
+    }
+
+    return res;
+}