Add DB serialization and user bindings

iFacility/db/database.h

@@ -0,0 +1,45 @@
+#ifndef DATABASE_H
+#define DATABASE_H
+
+#include <algorithm>
+#include <functional>
+
+#include <QFile>
+#include <QDataStream>
+#include <QVector>
+#include <QString>
+
+#include "../objects/profession.h"
+#include "../objects/user.h"
+
+typedef std::function<bool(User)> UserPredicat;
+
+class Database {
+private:
+    static Database *mInstance;
+    static const QString mFilename;
+
+    Database() = default;
+    QVector<Profession> mProfessions;
+    QVector<User> mUsers;
+
+    QVector<User*> findUserByPredicat(UserPredicat predicat);
+
+public:
+    static Database* instance();
+    QVector<Profession> professions() const;
+    QVector<User> users() const;
+
+    bool addUser(User usr);
+    User* getUser(UID uid);
+    User* getUser(QString login);
+    QVector<User*> getUsersByType(UserType type);
+    QVector<User*> getUsersByProfession(Profession prof);
+
+    Profession* getProfession(PID pid);
+
+    void save();
+    void load();
+};
+
+#endif // DATABASE_H