erste Implementierung, klappt aber noch nicht, liegt aber glaub ich am model

und der Funktion lese Punkte, speichere Punkte

.gitignore

 /nbproject/private/
+/build/

src/mvcgrafik/Start.java

 
 import javax.swing.JOptionPane;
 import javax.swing.UIManager;
+import mvcgrafik.controller.CommandController;
 import mvcgrafik.controller.GrafikController;
 import mvcgrafik.model.GrafikModel;
 import mvcgrafik.view.GrafikFrame;
     GrafikView view = frm.getgZeichenflaeche();
     view.setModel(model);
     GrafikController controller = new GrafikController(view, model);
+    CommandController controller_commands = new CommandController(frm, model);
     controller.registerEvents();
+    controller_commands.registerEvents();
+    controller_commands.registerCommands();
     frm.setVisible(true);
   }
 

src/mvcgrafik/controller/CommandController.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package mvcgrafik.controller;
+
+import java.awt.Component;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import mvcgrafik.controller.commands.CommandInvoker;
+import mvcgrafik.controller.commands.OpenCommand;
+import mvcgrafik.controller.commands.SaveCommand;
+import mvcgrafik.model.GrafikModel;
+import mvcgrafik.view.GrafikFrame;
+
+/**
+ *
+ * @author ahren
+ */
+public class CommandController implements ActionListener
+{
+  private GrafikFrame view;
+  private GrafikModel model;
+  private CommandInvoker invoker;
+    
+  public CommandController(GrafikFrame view, GrafikModel model)
+  {
+    this.view = view;
+    this.model = model;
+    this.invoker = new CommandInvoker();
+  }
+
+  public void registerEvents()
+  {
+    view.getBtnFileOpen().addActionListener(this);
+    view.getBtnFileSave().addActionListener(this);
+  }
+  
+  public void registerCommands()
+  {
+    invoker.addCommand(view.getBtnFileOpen(), new OpenCommand(view, model));
+    invoker.addCommand(view.getBtnFileSave(), new SaveCommand(view,model));  
+  }
+  
+    /**
+     * Ausführen des jeweiligen Kommandos
+     * @param e Referenz auf das Event
+     */
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        Component key = (Component)e.getSource();
+        invoker.executeCommand(key);
+        if(key == view.getBtnFileOpen()){
+          invoker.deleteStack();
+        }
+    }
+}

src/mvcgrafik/controller/commands/CommandInterface.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Interface.java to edit this template
+ */
+package mvcgrafik.controller.commands;
+
+/**
+ *
+ * @author ahren
+ */
+public interface CommandInterface
+{
+  public void execute();
+  public void undo();
+  public void redo();
+  public boolean isUndoable();
+}

src/mvcgrafik/controller/commands/CommandInvoker.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package mvcgrafik.controller.commands;
+
+import java.awt.Component;
+import java.util.HashMap;
+import java.util.Stack;
+
+/**
+ * Dient zur Realisierung des Polymorphismus
+ * für das COmmand-Design-Pattern
+ * Die Commands werden in einer HashMap gespeichert
+ * @author ahren
+ * @see CommandInterface
+ */
+public class CommandInvoker {
+    
+    private HashMap<Component, CommandInterface> commands;
+    private Stack <CommandInterface> undoStack;
+    
+    public CommandInvoker(){
+        commands = new HashMap<>();
+        undoStack = new Stack();  
+    }
+    
+    /**
+    * Fügt ein Kommando zur Kommando-"Datenbank" = HashMap hinzu
+    * @param key Quelle des Events
+    * @param value Referenz auf das zugehörige Kommando-Objekt
+    */
+    public void addCommand(Component key, CommandInterface value){
+        commands.put(key, value);
+    }
+    
+    /**
+    * Führt Kommando der Eventquelle "key" aus und legt die Referenz
+    * des Kommando in den Undo-Stack
+    * @param key Referenz auf die Eventquelle
+    */
+    public void executeCommand(Component key){
+      CommandInterface command = commands.get(key);
+      command.execute();
+      if (command.isUndoable())
+      {
+        undoStack.push(command);
+      }
+    }
+    /**
+    * Falls der Stack Elemente enthält, wird das oberste Element geholt
+    * und die Methode "undo" des Commands aufgerufen
+    */
+    public void undoCommand()
+    {
+      if (!undoStack.isEmpty())
+      {
+        undoStack.pop().undo();
+      }
+    }
+
+    /**
+     * Löscht bei Öffnen einer neuen Datei den Stack
+     */
+    public void deleteStack()
+    {
+      while(!undoStack.isEmpty())
+        undoStack.pop();
+    }
+    
+}
+

src/mvcgrafik/controller/commands/OpenCommand.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package mvcgrafik.controller.commands;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.JFileChooser;
+import mvcgrafik.model.GrafikModel;
+import mvcgrafik.view.GrafikFrame;
+
+
+/**
+ *
+ * @author ahren
+ */
+public class OpenCommand implements CommandInterface
+{
+  private GrafikFrame view;
+  private GrafikModel model;
+  
+  public OpenCommand(GrafikFrame view, GrafikModel model)
+  {
+    this.view = view;
+    this.model = model;
+  }
+
+  @Override
+  public void execute() {
+    JFileChooser fc = view.getFcFileChooser();
+    String lastDirectory = model.getPref();
+    if (lastDirectory != null) {
+        fc.setCurrentDirectory(new File(lastDirectory));
+    }
+    int choice = fc.showOpenDialog(view);
+    if (choice == JFileChooser.APPROVE_OPTION)
+    {
+      File selectedFile = fc.getSelectedFile();
+      String filename = selectedFile.getAbsolutePath();
+      model.putPref("lastDirectory", selectedFile.getParent());
+
+      try
+      {
+        model.lesePunkte(filename);
+      }
+      catch (FileNotFoundException ex)
+      {
+        Logger.getLogger(OpenCommand.class.getName()).log(Level.SEVERE, null, ex);
+      }
+      catch (ClassNotFoundException | IOException ex)
+      {
+        Logger.getLogger(OpenCommand.class.getName()).log(Level.SEVERE, null, ex);
+      }
+      model.deleteArrays();
+    }
+  }
+
+  @Override
+  public void undo() {
+      throw new UnsupportedOperationException("Not undoable."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+  }
+
+  @Override
+  public void redo() {
+      throw new UnsupportedOperationException("Not redoable."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+  }
+
+  @Override
+  public boolean isUndoable()
+  {
+    return false;
+  }
+}

src/mvcgrafik/controller/commands/SaveCommand.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+
+package mvcgrafik.controller.commands;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.swing.JFileChooser;
+import mvcgrafik.model.GrafikModel;
+import mvcgrafik.view.GrafikFrame;
+
+/**
+ *
+ * @author ahren
+ */
+public class SaveCommand implements CommandInterface
+{
+   private GrafikFrame view;
+    private GrafikModel model;
+    
+    public SaveCommand(GrafikFrame view, GrafikModel model){
+        this.view = view;
+        this.model = model;
+    }
+    
+  /**
+   * Aufrufen des File Choosers in zuletzt verwendeten Ordner, versuchen die 
+   * Tabellendatei zu speichern
+   */
+    @Override
+    public void execute() {
+      JFileChooser fc = view.getFcFileChooser();
+      String lastDirectory = model.getPref();
+      if (lastDirectory != null) {
+          fc.setCurrentDirectory(new File(lastDirectory));
+      }
+      int choice = fc.showSaveDialog(view);
+      if (choice == JFileChooser.APPROVE_OPTION)
+      {
+        File selectedFile = fc.getSelectedFile();
+        String filename = selectedFile.getAbsolutePath();
+        model.putPref("lastDirectory", selectedFile.getParent());
+        
+        try
+        {
+          model.speicherePunkte(filename);
+        }
+        catch (FileNotFoundException ex)
+        {
+          Logger.getLogger(SaveCommand.class.getName()).log(Level.SEVERE, null, ex);
+        }
+        catch (IOException ex)
+        {
+          Logger.getLogger(SaveCommand.class.getName()).log(Level.SEVERE, null, ex);
+        }
+      }
+    }
+    
+
+    @Override
+    public void undo() {
+        throw new UnsupportedOperationException("Not undoable."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public void redo() {
+        throw new UnsupportedOperationException("Not redoable."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean isUndoable() {
+        return false;
+    }
+    
+}

src/mvcgrafik/model/GrafikModel.java

 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.prefs.Preferences;
 
 /**
  *
 {
   private ArrayList<Point> punkte;
   private ArrayList<ArrayList> figuren;
+    private Preferences pref;
   
   public GrafikModel()
   {
         punkte.clear();
     }
   
-  
+    /**
+   * Bestimmt die Adresse des zuletzt besuchten Ordners
+   * @return letzter Ordner
+   */
+  public String getPref()
+  {
+        pref = Preferences.userNodeForPackage(getClass());
+        return pref.get("lastDirectory", null);
+  }
+
+  /**
+   * Setzt die Preferenz zu dem zuletzt besuchten Ordner
+   * @param lastDirectory Bezeichner "lastDirectory"
+   * @param lastAdress Adresse des zuletzt besuchten Ordners
+   */
+  public void putPref(String lastDirectory, String lastAdress)
+  {
+    pref.put(lastDirectory, lastAdress);
+  }
+
+  public void deleteArrays()
+  {
+    figuren.clear();
+    punkte.clear();
+  }
   
 }

src/mvcgrafik/view/GrafikFrame.form

 <?xml version="1.0" encoding="UTF-8" ?>
 
 <Form version="1.3" maxVersion="1.9" type="org.netbeans.modules.form.forminfo.JFrameFormInfo">
+  <NonVisualComponents>
+    <Component class="javax.swing.JFileChooser" name="FcFileChooser">
+    </Component>
+  </NonVisualComponents>
   <Properties>
     <Property name="defaultCloseOperation" type="int" value="3"/>
   </Properties>
         <Property name="useNullLayout" type="boolean" value="true"/>
       </Layout>
     </Container>
+    <Container class="javax.swing.JToolBar" name="jToolBar1">
+      <Properties>
+        <Property name="rollover" type="boolean" value="true"/>
+      </Properties>
+      <Constraints>
+        <Constraint layoutClass="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout" value="org.netbeans.modules.form.compat2.layouts.DesignBorderLayout$BorderConstraintsDescription">
+          <BorderConstraints direction="First"/>
+        </Constraint>
+      </Constraints>
+
+      <Layout class="org.netbeans.modules.form.compat2.layouts.DesignBoxLayout"/>
+      <SubComponents>
+        <Component class="javax.swing.JButton" name="btnFileOpen">
+          <Properties>
+            <Property name="icon" type="javax.swing.Icon" editor="org.netbeans.modules.form.editors2.IconEditor">
+              <Image iconType="3" name="/mvcgrafik/view/Open24.gif"/>
+            </Property>
+            <Property name="toolTipText" type="java.lang.String" value="Open File"/>
+            <Property name="focusable" type="boolean" value="false"/>
+            <Property name="horizontalTextPosition" type="int" value="0"/>
+            <Property name="verticalTextPosition" type="int" value="3"/>
+          </Properties>
+        </Component>
+        <Component class="javax.swing.JButton" name="btnFileSave">
+          <Properties>
+            <Property name="icon" type="javax.swing.Icon" editor="org.netbeans.modules.form.editors2.IconEditor">
+              <Image iconType="3" name="/mvcgrafik/view/Save24.gif"/>
+            </Property>
+            <Property name="toolTipText" type="java.lang.String" value="Safe File"/>
+            <Property name="horizontalTextPosition" type="int" value="0"/>
+            <Property name="verticalTextPosition" type="int" value="3"/>
+          </Properties>
+        </Component>
+      </SubComponents>
+    </Container>
   </SubComponents>
 </Form>

src/mvcgrafik/view/GrafikFrame.java

  */
 public class GrafikFrame extends javax.swing.JFrame
 {
+
+  /**
+   * @return the FcFileChooser
+   */
+  public javax.swing.JFileChooser getFcFileChooser()
+  {
+    return FcFileChooser;
+  }
+
+  /**
+   * @return the btnFileOpen
+   */
+  public javax.swing.JButton getBtnFileOpen()
+  {
+    return btnFileOpen;
+  }
+
+  /**
+   * @return the btnFileSave
+   */
+  public javax.swing.JButton getBtnFileSave()
+  {
+    return btnFileSave;
+  }
   /**
    * @return the gZeichenflaeche
    */
   private void initComponents()
   {
 
+    FcFileChooser = new javax.swing.JFileChooser();
     gZeichenflaeche = new mvcgrafik.view.GrafikView();
+    jToolBar1 = new javax.swing.JToolBar();
+    btnFileOpen = new javax.swing.JButton();
+    btnFileSave = new javax.swing.JButton();
 
     setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
     getContentPane().add(gZeichenflaeche, java.awt.BorderLayout.CENTER);
 
+    jToolBar1.setRollover(true);
+
+    btnFileOpen.setIcon(new javax.swing.ImageIcon(getClass().getResource("/mvcgrafik/view/Open24.gif"))); // NOI18N
+    btnFileOpen.setToolTipText("Open File");
+    btnFileOpen.setFocusable(false);
+    btnFileOpen.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
+    btnFileOpen.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
+    jToolBar1.add(btnFileOpen);
+
+    btnFileSave.setIcon(new javax.swing.ImageIcon(getClass().getResource("/mvcgrafik/view/Save24.gif"))); // NOI18N
+    btnFileSave.setToolTipText("Safe File");
+    btnFileSave.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
+    btnFileSave.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM);
+    jToolBar1.add(btnFileSave);
+
+    getContentPane().add(jToolBar1, java.awt.BorderLayout.PAGE_START);
+
     setSize(new java.awt.Dimension(540, 412));
     setLocationRelativeTo(null);
   }// </editor-fold>//GEN-END:initComponents
   }
 
   // Variables declaration - do not modify//GEN-BEGIN:variables
+  private javax.swing.JFileChooser FcFileChooser;
+  private javax.swing.JButton btnFileOpen;
+  private javax.swing.JButton btnFileSave;
   private mvcgrafik.view.GrafikView gZeichenflaeche;
+  private javax.swing.JToolBar jToolBar1;
   // End of variables declaration//GEN-END:variables
 }