Implement basic functionality of MyHashTable

app/src/main/java/ch/nuth/zhaw/exbox/ExBoxFrame.java

@@ -32,7 +32,7 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 	private final Dimension UHDTHRESHOLD = new Dimension(2000, 1500);
 	private final String STANDARDENCODING = "UTF-8";
 
-	private JMenuItem connect, exit, open, test, retest, textView, graphicView, clear;
+	private JMenuItem connect, reset, exit, open, test, retest, textView, graphicView, clear;
 	private JMenu menuServer;
 	private JButton enter;
 	private JTextField arguments;
@@ -80,6 +80,9 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 		connect = new JMenuItem("Connect ...");
 		connect.addActionListener(this);
 		menuServer.add(connect);
+		reset = new JMenuItem("Reset Server...");
+		reset.addActionListener(this);
+		menuServer.add(reset);
 
 		JMenu menuView = new JMenu("View");
 		menuBar.add(menuView);
@@ -183,10 +186,6 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 	}
 
 	private void execute(String args) throws Exception {
-		if (lastServer != null) {
-			command = ServerFactory.createServer(lastServer);
-		}
-
 		if (!arguments.getText().equals(history.getItemAt(0))
 				&& !arguments.getText().equals(history.getSelectedItem())) {
 			history.insertItemAt(arguments.getText(), 0);
@@ -251,7 +250,7 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 
 	private void connectCommand() throws Exception {
 		String name = openFileDialog(getPathCompiled(), "*Server.class");
-		command = ServerFactory.createServer(name);
+		loadServer(name);
 		lastServer = name;
 		String fullClassName = command.getClass().getName();
 		String simpleClassName = fullClassName.substring(fullClassName.lastIndexOf('.') + 1);
@@ -259,6 +258,16 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 
 	}
 
+	private void resetCommand() throws Exception {
+		if (lastServer != null) {
+			loadServer(lastServer);
+		}
+	}
+
+	private void loadServer(String name) throws Exception {
+		command = ServerFactory.createServer(name);
+	}
+
 	private void openFile() throws Exception {
 		String name = openFileDialog(null, null);
 
@@ -291,6 +300,8 @@ public class ExBoxFrame extends JFrame implements ActionListener, ItemListener {
 				execute(arguments.getText());
 			} else if (e.getSource() == connect) {
 				connectCommand();
+			} else if (e.getSource() == reset) {
+				resetCommand();
 			} else if (e.getSource() == test) {
 				testCommand(false);
 			} else if (e.getSource() == retest) {

app/src/main/java/ch/nuth/zhaw/exbox/MyHashtable.java

@@ -6,37 +6,69 @@ import java.util.Set;
 
 @SuppressWarnings("unchecked")
 public class MyHashtable<K, V> implements Map<K, V> {
+    private int capacity;
+    private int size;
     private K[] keys = (K[]) new Object[10];
     private V[] values = (V[]) new Object[10];
 
+    public MyHashtable(int size) {
+        capacity = size;
+        clear();
+    }
+
+    private boolean hashEquals(Object x, Object y) {
+        if (x == null || y == null) {
+            return x == y;
+        } else {
+            return x.hashCode() == y.hashCode();
+        }
+    }
+
     private int hash(Object k) {
         int h = Math.abs(k.hashCode());
         return h % keys.length;
     }
 
-    public MyHashtable(int size) {
-        // to be done
-    }
-
     // Removes all mappings from this map (optional operation).
     public void clear() {
-        // to be done
+        keys = (K[]) new Object[capacity];
-        throw new UnsupportedOperationException();
+        values = (V[]) new Object[capacity];
     }
 
-    // Associates the specified value with the specified key in this map (optional operation).
+    // Associates the specified value with the specified key in this map (optional
+    // operation).
     public V put(K key, V value) {
-        // to be done
+        int hashCode = hash(key);
-        throw new UnsupportedOperationException();
+        int index = hashCode;
+
+        for (int i = 0; keys[index] != null && !hashEquals(keys[index], key); i++) {
+            index = hash(hashCode + (int) Math.pow(i, 2));
+        }
+
+        if (keys[index] == null) {
+            size++;
+        }
+
+        keys[index] = key;
+        values[index] = value;
+
+        return value;
     }
 
     // Returns the value to which this map maps the specified key.
     public V get(Object key) {
         // to be done
-        throw new UnsupportedOperationException();
+        for (int i = 0; i < keys.length; i++) {
+            if (hashEquals(key, keys[i])) {
+                return values[i];
+            }
+        }
+
+        return null;
     }
 
-    // Removes the mapping for this key from this map if present (optional operation).
+    // Removes the mapping for this key from this map if present (optional
+    // operation).
     public V remove(Object key) {
         // to be done (Aufgabe 3)
         throw new UnsupportedOperationException();
@@ -44,11 +76,11 @@ public class MyHashtable<K, V> implements Map<K, V> {
 
     // Returns the number of key-value mappings in this map.
     public int size() {
-        // to be done
+        return size;
-        throw new UnsupportedOperationException();
     }
 
-    // UnsupportedOperationException ===================================================================
+    // UnsupportedOperationException
+    // ===================================================================
     // Returns a collection view of the values contained in this map.
     public Collection<V> values() {
         throw new UnsupportedOperationException();
@@ -74,7 +106,8 @@ public class MyHashtable<K, V> implements Map<K, V> {
         throw new UnsupportedOperationException();
     }
 
-    // Copies all of the mappings from the specified map to this map (optional operation).
+    // Copies all of the mappings from the specified map to this map (optional
+    // operation).
     public void putAll(Map<? extends K, ? extends V> t) {
         throw new UnsupportedOperationException();
     }