Add DB serialization and user bindings

iFacility/db/database.cpp

@@ -0,0 +1,79 @@
+#include "database.h"
+
+Database *Database::mInstance = new Database();
+const QString Database::mFilename = "data.bin";
+
+Database* Database::instance() {
+    return Database::mInstance;
+}
+
+QVector<Profession> Database::professions() const {
+    return mProfessions;
+}
+
+QVector<User> Database::users() const {
+    return mUsers;
+}
+
+bool Database::addUser(User usr) {
+    if (getUser(usr.getLogin()) != nullptr) {
+        return false;
+    }
+    mUsers.push_back(usr);
+    return true;
+}
+
+QVector<User*> Database::findUserByPredicat(UserPredicat predicat) {
+    QVector<User*> out;
+    auto it = mUsers.begin();
+    while (it != mUsers.end()) {
+        it = std::find_if(it, mUsers.end(), predicat);
+        if (it != mUsers.end()) {
+            out.push_back(it++);
+        }
+    }
+    return out;
+}
+
+User* Database::getUser(UID uid) {
+    auto pred = [uid](User u) { return u.uID() == uid; };
+    auto users = findUserByPredicat(pred);
+    return users.isEmpty()? nullptr : users[0];
+}
+
+User* Database::getUser(QString login) {
+    auto pred = [login](User u) { return u.getLogin() == login; };
+    auto users = findUserByPredicat(pred);
+    return users.isEmpty()? nullptr : users[0];
+}
+
+QVector<User*> Database::getUsersByType(UserType type) {
+    auto pred = [type](User u) { return u.getUserType() == type; };
+    return findUserByPredicat(pred);
+}
+
+QVector<User*> Database::getUsersByProfession(Profession prof) {
+    auto pred = [prof](User u) { return u.hasProfession(prof.pID()); };
+    return findUserByPredicat(pred);
+}
+
+void Database::save() {
+    QFile f(Database::mFilename);
+    f.open(QIODevice::ReadOnly);
+    QDataStream stream(&f);
+    stream << mProfessions << mUsers;
+    f.close();
+}
+
+void Database::load() {
+    if (!QFile().exists(Database::mFilename)) {
+        return;
+    }
+    mUsers.clear();
+    mProfessions.clear();
+    QFile f(Database::mFilename);
+    f.open(QIODevice::WriteOnly);
+    QDataStream stream(&f);
+    stream >> mProfessions >> mUsers;
+    f.close();
+}