From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../hjp5/examples/VetoSwitch.java                  | 114 +++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java

(limited to 'Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java')

diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java b/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java
new file mode 100644
index 0000000..ddc8a87
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/VetoSwitch.java	
@@ -0,0 +1,114 @@
+/* VetoSwitch.java */
+
+import java.awt.*;
+import java.awt.event.*;
+import java.io.*;
+import java.beans.*;
+
+public class VetoSwitch
+extends Canvas
+implements Serializable, VetoableChangeListener
+{
+  //---Instanzvariablen----------------------------------------
+  protected Color   linecolor;
+  protected boolean vetoallchanges;
+
+  //---Methoden------------------------------------------------
+  public VetoSwitch()
+  {
+    this.linecolor = Color.black;
+    this.vetoallchanges = false;
+    initTransientState();
+  }
+
+  //---Konturenfarbe---
+  public void setLineColor(Color color)
+  {
+    this.linecolor = color;
+  }
+
+  public Color getLineColor()
+  {
+    return this.linecolor;
+  }
+
+  //---Zustandsumschaltung Licht an/aus---
+  public void setVetoAllChanges(boolean b)
+  {
+    if (this.vetoallchanges != b) {
+      this.vetoallchanges = b;
+      repaint();
+    }
+  }
+
+  public boolean getVetoAllChanges()
+  {
+    return this.vetoallchanges;
+  }
+
+  //---Veto---
+  public void vetoableChange(PropertyChangeEvent e)
+  throws PropertyVetoException
+  {
+    if (this.vetoallchanges) {
+      throw new PropertyVetoException("!!!VETO!!!", e);
+    }
+  }
+
+  //---Implementierung der Oberfläche---
+  public void paint(Graphics g)
+  {
+    int width = getSize().width;
+    int height = getSize().height;
+    g.setColor(linecolor);
+    g.drawRect(0, 0, width - 1, height - 1);
+    g.drawLine(width * 1 / 8, height / 2, width * 3 / 8, height / 2);
+    g.drawLine(width * 5 / 8, height / 2, width * 7 / 8, height / 2);
+    g.fillRect(width * 3 / 8 - 1, height / 2 - 1, 3, 3);
+    g.fillRect(width * 5 / 8 - 1, height / 2 - 1, 3, 3);
+    if (this.vetoallchanges) {
+      //draw open connection
+      g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 4);
+    } else {
+      //draw short-cutted connection
+      g.drawLine(width * 3 / 8, height / 2, width * 5 / 8, height / 2);
+    }
+  }
+
+  public Dimension getPreferredSize()
+  {
+    return new Dimension(60, 20);
+  }
+
+  public Dimension getMinimumSize()
+  {
+    return new Dimension(28, 10);
+  }
+
+  //---Private Klassen----------------------------------------
+  private void initTransientState()
+  {
+    addMouseListener(new MouseClickAdapter());
+  }
+
+  /**
+   * Wird überlagert, um nach dem Deserialisieren den transienten
+   * Zustand zu initialisieren.
+   */
+  private void readObject(ObjectInputStream stream)
+  throws IOException, ClassNotFoundException
+  {
+    stream.defaultReadObject();
+    initTransientState();
+  }
+
+  //---Lokale Klassen----------------------------------------
+  class MouseClickAdapter
+  extends MouseAdapter
+  {
+    public void mouseClicked(MouseEvent event)
+    {
+      setVetoAllChanges(!getVetoAllChanges());
+    }
+  }
+}
\ No newline at end of file
-- 
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