Fixed Log with respect to variations

.classpath

@@ -7,11 +7,7 @@
 			<attribute name="test" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
-		<attributes>
-			<attribute name="module" value="true"/>
-		</attributes>
-	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/5"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

src/dev/kske/chess/board/Board.java

@@ -545,7 +545,7 @@ public class Board implements Cloneable {
 
 		board.kingPos = new HashMap<>();
 		board.kingPos.putAll(kingPos);
-		board.log = (Log) log.clone();
+		board.log = new Log(log);
 
 		return board;
 	}

src/dev/kske/chess/board/Log.java

@@ -1,7 +1,7 @@
 package dev.kske.chess.board;
 
-import java.util.HashSet;
-import java.util.Set;
+import java.util.ArrayList;
+import java.util.List;
 
 import dev.kske.chess.board.Piece.Color;
 
@@ -11,7 +11,7 @@ import dev.kske.chess.board.Piece.Color;
  * Created: <strong>09.07.2019</strong><br>
  * Author: <strong>Kai S. K. Engelbart</strong>
  */
-public class Log implements Cloneable {
+public class Log {
 
 	private MoveNode root, current;
 
@@ -23,21 +23,24 @@ public class Log implements Cloneable {
 		reset();
 	}
 
-	// TODO: Adjust to variations
-	@Override
-	public Object clone() {
-		Log log = null;
-		try {
-			log = (Log) super.clone();
-			if (!isEmpty()) {
-				log.current = (MoveNode) current.clone();
-				if (current == root) log.root = log.current;
-				else log.root = (MoveNode) root.clone();
+	/**
+	 * Creates a partial deep copy of another {@link Log} instance which begins with
+	 * the current node.
+	 * 
+	 * @param other The {@link Log} instance to copy
+	 */
+	public Log(Log other) {
+		enPassant		= other.enPassant;
+		activeColor		= other.activeColor;
+		fullmoveCounter	= other.fullmoveCounter;
+		halfmoveClock	= other.halfmoveClock;
+
+		// The new root is the current node of the copied instance
+		if (!other.isEmpty()) {
+			root		= new MoveNode(other.current);
+			root.parent	= null;
+			current		= root;
 		}
-		} catch (CloneNotSupportedException e) {
-			e.printStackTrace();
-		}
-		return log;
 	}
 
 	/**
@@ -69,21 +72,14 @@ public class Log implements Cloneable {
 	 * move.
 	 */
 	public void removeLast() {
-		if (!isEmpty()) {
-			if (current.parent == null) {
-				current	= null;
-				root	= null;
-			} else {
+		if (!isEmpty() && current.parent != null) {
 			current			= current.parent;
-				if (!isEmpty()) {
 			activeColor		= current.activeColor;
 			enPassant		= current.enPassant;
 			fullmoveCounter	= current.fullmoveCounter;
 			halfmoveClock	= current.halfmoveClock;
 		} else reset();
 	}
-		} else reset();
-	}
 
 	public boolean isEmpty() { return root == null; }
 
@@ -135,8 +131,19 @@ public class Log implements Cloneable {
 		public final int		fullmoveCounter, halfmoveClock;
 
 		private MoveNode		parent;
-		private Set<MoveNode>	variations	= new HashSet<>();
+		private List<MoveNode>	variations	= new ArrayList<>();
 
+		/**
+		 * Creates a new {@link MoveNode}
+		 * 
+		 * @param move            The logged {@link Move}
+		 * @param capturedPiece   The {@link Piece} captures by the logged {@link Move}
+		 * @param enPassant       The en passant {@link Position} valid after the logged
+		 *                        {@link Move}, or {@code null} if there is none
+		 * @param activeColor     The {@link Color} active after the logged {@link Move}
+		 * @param fullmoveCounter
+		 * @param halfmoveClock
+		 */
 		public MoveNode(Move move, Piece capturedPiece, Position enPassant, Color activeColor, int fullmoveCounter,
 				int halfmoveClock) {
 			this.move				= move;
@@ -147,11 +154,26 @@ public class Log implements Cloneable {
 			this.halfmoveClock		= halfmoveClock;
 		}
 
-		@Override
-		protected Object clone() throws CloneNotSupportedException {
-			return super.clone();
+		/**
+		 * Creates a deep copy of another {@link MoveNode}.
+		 * 
+		 * @param other The {@link MoveNode} to copy
+		 */
+		public MoveNode(MoveNode other) {
+			this(other.move, other.capturedPiece, other.enPassant, other.activeColor, other.fullmoveCounter,
+					other.halfmoveClock);
+			other.variations.forEach(variation -> {
+				MoveNode copy = new MoveNode(variation);
+				copy.parent = this;
+				variations.add(copy);
+			});
 		}
 
+		/**
+		 * Adds another {@link MoveNode} as a child node.
+		 * 
+		 * @param variation The {@link MoveNode} to append to this {@link MoveNode}
+		 */
 		public void addVariation(MoveNode variation) {
 			if (!variations.contains(variation)) {
 				variations.add(variation);

src/dev/kske/chess/ui/LogPanel.java

@@ -57,6 +57,7 @@ public class LogPanel extends JPanel implements Subscribable {
 	public void handle(Event<?> event) {
 		if (log == null) return;
 
+		// TODO: Display log with variations
 		final List<MoveNode>	moves	= /* log.getLoggedMoves() */ new ArrayList<>();
 		String[][]				data	= new String[moves.size() / 2 + moves.size() % 2][2];
 		for (int i = 0; i < data.length; i++) {

test/dev/kske/chess/board/LogTest.java

@@ -39,7 +39,7 @@ class LogTest {
 	 */
 	@Test
 	void testClone() {
-		Log other = (Log) log.clone();
+		Log other = new Log(log);
 		log.setActiveColor(Color.WHITE);
 		other.setActiveColor(Color.BLACK);
 		assertNotEquals(other.getActiveColor(), log.getActiveColor());