Add xml saving and loading

1 files changed, 116 insertions, 2 deletions

diff --git a/src/de/fhswf/in/inf/se/notepadMinusMinus/Main.java b/src/de/fhswf/in/inf/se/notepadMinusMinus/Main.java
index 9481abe..55e550a 100644
--- a/src/de/fhswf/in/inf/se/notepadMinusMinus/Main.java
+++ b/src/de/fhswf/in/inf/se/notepadMinusMinus/Main.java
@@ -1,11 +1,21 @@
 package de.fhswf.in.inf.se.notepadMinusMinus;
 
+import java.io.File;
+import java.util.prefs.Preferences;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.Marshaller;
+import javax.xml.bind.Unmarshaller;
+
 import de.fhswf.in.inf.se.notepadMinusMinus.model.Grade;
+import de.fhswf.in.inf.se.notepadMinusMinus.model.Grades;
 import javafx.application.Application;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Alert.AlertType;
 import javafx.scene.layout.BorderPane;
 import javafx.stage.Stage;
 
@@ -14,13 +24,19 @@ public class Main extends Application
    private ObservableList<Grade> gradeList = FXCollections
          .observableArrayList();
 
+   private Stage primaryStage;
+
    @Override
    public void start(Stage primaryStage)
    {
+      this.primaryStage = primaryStage;
+
       try
       {
-         BorderPane root = (BorderPane) FXMLLoader
-               .load(getClass().getResource("view/mainView.fxml"));
+         FXMLLoader loader = new FXMLLoader(
+               getClass().getResource("view/MainView.fxml"));
+         BorderPane root = (BorderPane) loader.load();
+
          Scene scene = new Scene(root);
          primaryStage.setScene(scene);
          primaryStage.setMaximized(true);
@@ -41,4 +57,102 @@ public class Main extends Application
    {
       return gradeList;
    }
+
+   public File getGradesFilePath()
+   {
+      Preferences prefs = Preferences.userNodeForPackage(Main.class);
+      String filePath = prefs.get("filePath", null);
+      if (filePath != null)
+      {
+         return new File(filePath);
+      }
+      else
+      {
+         return null;
+      }
+   }
+
+   public void setGradesFilePath(File file)
+   {
+      Preferences prefs = Preferences.userNodeForPackage(Main.class);
+      if (file != null)
+      {
+         prefs.put("filePath", file.getPath());
+
+         // Update the stage title.
+         primaryStage.setTitle("Notepad-- - " + file.getName());
+      }
+      else
+      {
+         prefs.remove("filePath");
+
+         // Update the stage title.
+         primaryStage.setTitle("Notepad--");
+      }
+   }
+
+   public void loadGradesFromFile(File file)
+   {
+      try
+      {
+         JAXBContext context = JAXBContext.newInstance(Grades.class);
+         Unmarshaller um = context.createUnmarshaller();
+
+         // Reading XML from the file and unmarshalling.
+         Grades wrapper = (Grades) um.unmarshal(file);
+
+         gradeList.clear();
+         gradeList.addAll(wrapper.getGrades());
+
+         // Save the file path to the registry.
+         setGradesFilePath(file);
+
+      }
+      catch (Exception e)
+      { // catches ANY exception
+         Alert alert = new Alert(AlertType.ERROR);
+         alert.initOwner(primaryStage);
+         alert.setTitle("Fehler");
+         alert.setHeaderText("Konnte Noten nicht laden.");
+         alert.setContentText(
+               "Konnte Noten nicht aus folgender Datei laden:\n"
+                     + file.getPath());
+
+         alert.showAndWait();
+      }
+   }
+
+   public void saveGradesToFile(File file)
+   {
+      try
+      {
+         JAXBContext context = JAXBContext.newInstance(Grades.class);
+         Marshaller m = context.createMarshaller();
+         m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
+
+         // Wrapping our grades data.
+         Grades wrapper = new Grades();
+         wrapper.setGrades(gradeList);
+
+         // Marshalling and saving XML to the file.
+         m.marshal(wrapper, file);
+      }
+      catch (Exception e)
+      { // catches ANY exception
+         Alert alert = new Alert(AlertType.ERROR);
+         alert.initOwner(primaryStage);
+         alert.setTitle("Fehler");
+         alert.setHeaderText("Konnte Noten nicht speichern.");
+         alert.setContentText(
+               "Konnte Noten nicht in folgende Datei speichern:\n"
+                     + file.getPath());
+
+         alert.showAndWait();
+      }
+   }
+
+   public void saveGradesToFile()
+   {
+      saveGradesToFile(getGradesFilePath());
+   }
 }