Change initialize primary stage

pom.xml

@@ -37,6 +37,11 @@
             <version>${junit.jupiter.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.xerial</groupId>
+            <artifactId>sqlite-jdbc</artifactId>
+            <version>3.28.0</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

src/main/java/dev/mateuszkowalczyk/ffm/Main.java

@@ -1,24 +1,14 @@
 package dev.mateuszkowalczyk.ffm;
 
+import dev.mateuszkowalczyk.ffm.view.StageController;
 import javafx.application.Application;
-import javafx.fxml.FXMLLoader;
-import javafx.scene.Parent;
-import javafx.scene.Scene;
 import javafx.stage.Stage;
 
-import java.net.URL;
-
 public class Main extends Application {
 
     @Override
-    public void start(Stage primaryStage) throws Exception{
-        URL welcomePageUrl = getClass().getClassLoader().
-                getResource("welcomePage.fxml");
-
-        Parent welcomePage = FXMLLoader.load(welcomePageUrl);
-        primaryStage.setTitle("Friend Face Matcher");
-        primaryStage.setScene(new Scene(welcomePage));
-        primaryStage.show();
+    public void start(Stage stage) throws Exception{
+        StageController.getInstance().initApp(stage);
     }
 
 

src/main/java/dev/mateuszkowalczyk/ffm/utils/PropertiesLoader.java

@@ -0,0 +1,54 @@
+package dev.mateuszkowalczyk.ffm.utils;
+
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Properties;
+
+public class PropertiesLoader {
+    public static final String CONFIG_NAME_FILE = "config.properties";
+
+    private static final PropertiesLoader instance = new PropertiesLoader();
+    private ResourceLoader resourceLoader = ResourceLoader.getInstance();
+    private Properties properties = null;
+
+    public PropertiesLoader () {}
+
+    public static PropertiesLoader getInstance() {
+        return instance;
+    }
+
+    public Properties load() {
+        this.properties = new Properties();
+        try {
+            InputStream inputStream = resourceLoader.getResourceAsStream(CONFIG_NAME_FILE);
+            this.properties.load(inputStream);
+
+            inputStream.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        return this.properties;
+    }
+
+    public void save(Properties prop) {
+        try {
+            OutputStream output = new FileOutputStream(this.resourceLoader.getPath(CONFIG_NAME_FILE));
+            prop.store(output, null);
+
+            output.close();
+            System.out.println(prop);
+        } catch (IOException e){
+            e.printStackTrace();
+        }
+    }
+
+    public String get(String name) {
+        if (this.properties == null) {
+            this.load();
+        }
+
+        return this.properties.getProperty(name);
+    }
+}

src/main/java/dev/mateuszkowalczyk/ffm/utils/Property.java

@@ -0,0 +1,5 @@
+package dev.mateuszkowalczyk.ffm.utils;
+
+public class Property {
+    public static final String PATH_TO_DIRECTORY = "pathToDirectory";
+}

src/main/java/dev/mateuszkowalczyk/ffm/utils/ResourceLoader.java

@@ -0,0 +1,26 @@
+package dev.mateuszkowalczyk.ffm.utils;
+
+import java.io.InputStream;
+import java.net.URL;
+
+public class ResourceLoader {
+    private static final ResourceLoader instance = new ResourceLoader();
+
+    private ResourceLoader(){}
+
+    public URL getResource(String name) {
+        return getClass().getClassLoader().getResource(name);
+    }
+
+    public InputStream getResourceAsStream(String name) {
+        return getClass().getClassLoader().getResourceAsStream( name);
+    }
+
+    public String getPath(String name) {
+        return this.getResource(name).getPath();
+    }
+
+    public static ResourceLoader getInstance() {
+        return instance;
+    }
+}

src/main/java/dev/mateuszkowalczyk/ffm/view/StageController.java

@@ -0,0 +1,40 @@
+package dev.mateuszkowalczyk.ffm.view;
+
+import dev.mateuszkowalczyk.ffm.utils.Property;
+import dev.mateuszkowalczyk.ffm.utils.PropertiesLoader;
+import dev.mateuszkowalczyk.ffm.utils.ResourceLoader;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.Scene;
+import javafx.stage.Stage;
+
+import java.io.IOException;
+import java.net.URL;
+
+public class StageController {
+    private static final StageController instance = new StageController();
+    private ResourceLoader resourceLoader = ResourceLoader.getInstance();
+    private PropertiesLoader propertiesLoader = PropertiesLoader.getInstance();
+    private Stage stage;
+
+    private StageController() {}
+
+    public static StageController getInstance() {
+        return instance;
+    }
+
+    public void initApp(Stage stage) throws IOException {
+        this.stage = stage;
+        this.stage.setTitle("Friend Face Matcher");
+
+        URL sceneUrl = null;
+        if (this.propertiesLoader.get(Property.PATH_TO_DIRECTORY) != null) {
+            sceneUrl = this.resourceLoader.getResource("welcomePage.fxml");
+        } else {
+            sceneUrl = this.resourceLoader.getResource("welcomePage.fxml");
+        }
+        Scene scene = new Scene(FXMLLoader.load(sceneUrl));
+        this.stage.setScene(scene);
+        this.stage.show();
+    }
+
+}

src/main/java/dev/mateuszkowalczyk/ffm/view/controller/WelcomePageController.java

@@ -1,4 +1,4 @@
-package dev.mateuszkowalczyk.ffm.controller;
+package dev.mateuszkowalczyk.ffm.view.controller;
 
 import javafx.fxml.FXML;
 

src/main/resources/welcomePage.fxml

@@ -6,7 +6,7 @@
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.text.Font?>
 
-<VBox prefHeight="400.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.mateuszkowalczyk.ffm.controller.WelcomePageController">
+<VBox prefHeight="400.0" prefWidth="640.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.mateuszkowalczyk.ffm.view.controller.WelcomePageController">
   <children>
     <AnchorPane maxHeight="-1.0" maxWidth="-1.0" prefHeight="-1.0" prefWidth="-1.0" VBox.vgrow="ALWAYS">
       <children>