GameTree based AI

Implemented the first version of a GameTree based AI. Comparable to best
Scala version, but a little weaker still.

farbot/src/farbot/FarbotIO.java

@@ -45,13 +45,17 @@ public class FarbotIO {
 	}
 	
 	private static void out(String out) {
-		log(out);
+		logln(out);
 		System.out.println(out);
 	}
 	
-	public static void log(String log) {
+	public static void logln(String log) {
 		GameState currentState = ai.getCurrentState();
 		String prefix = String.format("[%3d]: ", currentState.getRound());
 		System.err.println(prefix+log);
 	}
+	
+	public static void log(String log) {
+		System.err.print(log);
+	}
 }

farbot/src/farbot/ai/AI.java

@@ -1,25 +1,87 @@
 package farbot.ai;
 
-import farbot.FarbotIO;
+import java.util.ArrayList;
+import java.util.Set;
+
 import farbot.game.GameState;
+import farbot.game.MoveResult;
+import farbot.game.map.Move;
+
+import static farbot.FarbotIO.logln;
 
 public class AI {
 	private GameState currentState;
+	private int treeDepth = 20;
+	
+	private MoveValue lastMove;
 	
 	public AI() {
 		this.currentState = new GameState();
 	}
 	
 	public String calcMove(Integer time) {
-		return "up";
+		logln("Calculating move in "+time+"ms");
+		Set<Move> validMoves = currentState.selfMoves();
+		logln("Valid moves: "+validMoves.toString());
+
+		ArrayList<MoveValue> valuedMoves = new ArrayList<>();
+		
+		for(Move m: validMoves) {
+			logln("Checking move: "+m.name());
+			GameState fork = currentState.fork();
+			MoveResult mr = fork.moveSelf(m);
+			GameTree gt = new GameTree(fork);
+			gt.build(treeDepth);
+			Double value = gt.getValue();
+			value += mr.getCollectedCodes()*Math.pow((treeDepth+1), 1.6);
+			value -= mr.getKilledBugs()*8*Math.pow((treeDepth+1), 1.6);
+
+			logln("Move '"+m.name()+"': "+value);
+			valuedMoves.add(new MoveValue(m, value));
+		}
+		
+		valuedMoves.sort((mv1, mv2) -> -mv1.value.compareTo(mv2.value));
+		MoveValue maxMove = valuedMoves.get(0);
+		if(this.lastMove != null && this.lastMove.value <= maxMove.value) {
+			switch(this.lastMove.move) {
+			case LEFT:
+				if(maxMove.move == Move.RIGHT) maxMove = valuedMoves.get(1);
+				break;
+			case RIGHT:
+				if(maxMove.move == Move.LEFT) maxMove = valuedMoves.get(1);
+				break;
+			case UP:
+				if(maxMove.move == Move.DOWN) maxMove = valuedMoves.get(1);
+				break;
+			case DOWN:
+				if(maxMove.move == Move.UP) maxMove = valuedMoves.get(1);
+				break;
+			default:
+				assert(false);
+			}
+		}
+		
+		this.lastMove = maxMove;
+		
+		logln("Max.move '"+maxMove.move+"': "+maxMove.value);
+		return maxMove.move.name().toLowerCase();
 	}
 	
 	public void parseUpdate(String[] update) {
 		Parser.parse(update, currentState);
-		FarbotIO.log(currentState.toString());
 	}
 
 	public GameState getCurrentState() {
 		return currentState;
 	}
+	
+	private class MoveValue {
+		private Move move;
+		private Double value;
+		
+		private MoveValue(Move move, Double value) {
+			this.move = move;
+			this.value = value;
+		}
+	}
 }

farbot/src/farbot/ai/GameTree.java

@@ -0,0 +1,83 @@
+package farbot.ai;
+
+import static farbot.FarbotIO.logln;
+
+import farbot.game.map.Point;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.Queue;
+import java.util.Set;
+
+import farbot.game.GameState;
+import farbot.game.MoveResult;
+
+public class GameTree {
+	private GameState node;
+	private Double value;
+	private HashSet<Point> visited;
+	private Integer totalLevel;
+	
+	public GameTree(GameState root) {
+		this.node = root;
+		this.value = 0.0;
+		this.totalLevel = 1;
+		this.visited = new HashSet<>();
+	}
+	
+	public void build(int level) {
+		this.totalLevel = level;
+		
+		Queue<GameState> children = makeChildren(node, this, level);
+		
+		while(level > 0) {
+			level--;
+			
+			Queue<GameState> nextChildren = new LinkedList<>();
+			while(!children.isEmpty()) {
+				GameState child = children.poll();
+				nextChildren.addAll(makeChildren(child, this, level));
+			}
+			
+			children = nextChildren;
+			nextChildren = new LinkedList<>();
+		}
+	}
+	
+	/**
+	 * Get the value of a root node. Not 0.0 only for nodes
+	 * from which a GameTree was built (i.e. nodes on which 
+	 * build() was called)
+	 * 
+	 * @return Value of a root node. Always 0.0 if not the node
+	 * upon which build() was called.
+	 */
+	public Double getValue() {
+		return value;
+	}
+	
+	private Queue<GameState> makeChildren(GameState state, GameTree gtRoot, int level) {
+		Set<Point> selfMoves = state.selfMovePoints();
+		selfMoves.removeAll(gtRoot.visited);
+		LinkedList<GameState> children = new LinkedList<>();
+
+		for(Point selfMove: selfMoves) {			
+			GameState child = state.fork();
+			MoveResult mr = child.moveSelf(selfMove);
+			
+			if(mr.getCollectedCodes() != 0){
+				logln("Got "+mr.getCollectedCodes()+" codes at "+selfMove.toString()+" in level "+level);
+				gtRoot.value += Math.pow(level*mr.getCollectedCodes(), 1.3);
+			}
+			if(mr.getKilledBugs() != 0) {
+				logln("Killed "+mr.getKilledBugs()+" bugs at "+selfMove.toString()+" in level "+level);
+				gtRoot.value -= Math.pow(level*4*mr.getKilledBugs(), level/totalLevel);
+			}
+			
+			gtRoot.visited.add(selfMove);
+			
+			children.add(child);
+		}
+		
+		return children;
+	}
+}

farbot/src/farbot/ai/Parser.java

@@ -1,6 +1,6 @@
 package farbot.ai;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
 import farbot.game.GameState;
 import farbot.game.Settings;

farbot/src/farbot/game/GameState.java

@@ -1,76 +1,135 @@
 package farbot.game;
 
-import java.awt.Point;
+import farbot.game.map.Point;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
 
 import farbot.game.map.GameMap;
+import farbot.game.map.Move;
 import farbot.game.token.Bug;
 import farbot.game.token.Code;
 import farbot.game.token.Mine;
 
+/**
+ * Manager for the GameState.
+ * 
+ * Any data retrieved from GameState belongs to the caller.
+ */
 public class GameState {
+	private Integer round;
+	
 	private Player self;
 	private Player opponent;
-	private Integer round;
 	private GameMap map;
-	
+
+	private boolean forked;
+
 	public GameState() {
-		Settings s = Settings.getInstance();
-		this.self = new Player(new Point(0,0), s.getSelfId());
-		this.opponent = new Player(new Point(0,0), s.getOpponentId());
-		this.map = new GameMap();
+		this(new Player(new Point(0,0), Settings.getInstance().getSelfId()),
+			 new Player(new Point(0,0), Settings.getInstance().getOpponentId()),
+			 new GameMap(),
+			 0);
+	}
+
+	public GameState(Player self, Player opponent, GameMap map, Integer round) {
+		this(self, opponent, map, round, false);
 	}
 	
-	public GameState(Player self, Player opponent, Integer round) {
-		this.self = self;
-		this.opponent = opponent;
+	protected GameState(Player self, Player opponent, GameMap map, Integer round, Boolean forked) {
+		this.self = forked ? self.clone(): self;
+		this.opponent = forked ? opponent.clone(): opponent;
 		this.round = round;
+		this.map = map;
+		this.forked = forked;
+	}
+
+	public List<GameState> fork(Integer times) {
+		ArrayList<GameState> forks = new ArrayList<>();
+		for (int i=0; i<times; i++) forks.add(fork());
+		return forks;
 	}
 	
+	public GameState fork() {
+		GameState fork = new GameState(self.clone(), opponent.clone(), map.fork(), round, true);
+		fork.map.setForked(true);
+		return fork;
+	}
+
 	public void putToken(Bug bug) {
 		map.putToken(bug);
 	}
-	
+
 	public void putToken(Code code) {
 		map.putToken(code);
 	}
-	
+
 	public void putToken(Mine mine) {
 		map.putToken(mine);
 	}
-	
+
 	public void clearTokens() {
 		map.clearTokens();
 	}
-	
+
 	public void setSnippets(String playerName, Integer snippets) {
-		getPlayer(playerName).setSnippets(snippets);
+		Settings s = Settings.getInstance();
+		if (playerName == s.getSelfName()) self.setSnippets(snippets);
+		else opponent.setSnippets(snippets);
 	}
 	
+	public Integer getSelfSnippets() {
+		return self.getSnippets();
+	}
+	
+	public Integer getOpponentSnippets() {
+		return opponent.getSnippets();
+	}
+
 	public void setBombs(String playerName, Integer bombs) {
-		getPlayer(playerName).setBombs(bombs);
+		Settings s = Settings.getInstance();
+		if (playerName == s.getSelfName()) self.setBombs(bombs);
+		else opponent.setBombs(bombs);
 	}
 	
 	public void setPlayerPosition(Integer playerId, Point position) {
-		getPlayer(playerId).setPosition(position);
+		Settings s = Settings.getInstance();
+		if (playerId == s.getSelfId()) self.setPosition(position);
+		else opponent.setPosition(position);
 	}
 	
-	public Player getPlayer(String name) {
-		Settings s = Settings.getInstance();
-		if (name.equals(s.getSelfName())) return getSelf();
-		else return getOpponent();
-	}
-	public Player getPlayer(Integer id) {
-		Settings s = Settings.getInstance();
-		if (id == s.getSelfId()) return getSelf();
-		else return getOpponent();
-	}
-	public Player getSelf() {
-		return self;
-	}
-	public Player getOpponent() {
-		return opponent;
+	public Point getSelfPosition() {
+		return self.getPosition();
 	}
 	
+	public MoveResult moveSelf(Point position) {
+		return makeMove(self, position);
+	}
+	
+	public MoveResult moveSelf(Move move) {
+		return makeMove(self, calcMovePoint(self.getPosition(), move));
+	}
+
+	public MoveResult moveOpponent(Point position) {
+		return makeMove(opponent, position);
+	}
+	
+	public MoveResult moveOpponent(Move move) {
+		return makeMove(self, calcMovePoint(opponent.getPosition(), move));
+	}
+	
+	private MoveResult makeMove(Player player, Point position) {
+		player.setPosition(position);
+		
+		List<Code> codes = map.removeCodesAt(position);
+		List<Bug> bugs = map.removeBugsAt(position);
+
+		player.addSnippets(codes.size());
+		player.removeSnippets(bugs.size()*4);
+		
+		return new MoveResult(player.clone(), codes.size(), bugs.size());
+	}
+
 	public Integer getRound() {
 		return round;
 	}
@@ -78,6 +137,30 @@ public class GameState {
 		this.round = round;
 	}
 
+	public boolean isForked() {
+		return forked;
+	}
+	
+	public Set<Point> selfMovePoints(){
+		return map.validMovePoints(self.getPosition());
+	}
+	
+	public Set<Move> selfMoves(){
+		return map.validMoves(self.getPosition());
+	}
+	
+	public Set<Point> opponentMovePoints(){
+		return map.validMovePoints(opponent.getPosition());
+	}
+	
+	public Set<Move> opponentMoves(){
+		return map.validMoves(opponent.getPosition());
+	}
+	
+	public Point calcMovePoint(Point from, Move move) {
+		return map.calcMovePoint(from, move);
+	}
+
 	@Override
 	public String toString() {
 		return "GameState [self=" + self + ", opponent=" + opponent + ", round=" + round + ", map=" + map + "]";

farbot/src/farbot/game/MoveResult.java

@@ -0,0 +1,27 @@
+package farbot.game;
+
+public class MoveResult {
+	private Player player;
+	private int killedBugs;
+	private int collectedCodes;
+	
+	public MoveResult(Player player, int collectedCodes, int killedBugs) {
+		this.player = player;
+		this.killedBugs = killedBugs;
+		this.collectedCodes = collectedCodes;
+	}
+
+	public Player getPlayer() {
+		return player;
+	}
+
+	public int getKilledBugs() {
+		return killedBugs;
+	}
+
+	public int getCollectedCodes() {
+		return collectedCodes;
+	}
+	
+	
+}

farbot/src/farbot/game/Player.java

@@ -1,8 +1,8 @@
 package farbot.game;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
-public class Player {
+public class Player implements Cloneable {
 	private Integer bombs;
 	private Integer snippets;
 	private Point position;
@@ -31,6 +31,12 @@ public class Player {
 	protected void setSnippets(Integer snippets) {
 		this.snippets = snippets;
 	}
+	protected void addSnippets(Integer snippets) {
+		this.snippets += snippets;
+	}
+	protected void removeSnippets(Integer snippets) {
+		this.snippets -= snippets;
+	}
 	public Point getPosition() {
 		return position;
 	}
@@ -46,4 +52,9 @@ public class Player {
 	protected void setId(Integer id) {
 		this.id = id;
 	}
+	
+	@Override
+	public Player clone() {
+		return new Player(this.bombs, this.snippets, new Point(this.position), this.id);
+	}
 }

farbot/src/farbot/game/map/GameMap.java

@@ -1,93 +1,200 @@
 package farbot.game.map;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 import java.util.ArrayList;
+import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 import farbot.game.Settings;
 import farbot.game.token.Bug;
 import farbot.game.token.Code;
 import farbot.game.token.Mine;
+import farbot.game.token.Token;
+
+/**
+ * Represents the game map. Can be safely used in forks
+ * after setting setForked(true): Makes GameMap lazily
+ * immutable (creates deep copies of compound types on 
+ * modification only).
+ * 
+ * Any data retrieved from GameMap belongs to the caller.
+ */
+public final class GameMap {
 
-public class GameMap {
-	
 	private static Field[][] base; // contains invariant elements
+
+	private boolean forked;
 	
 	private List<Bug> bugs;
 	private Map<Point, List<Bug>> bugMap;
-	
+	private boolean dirtyBugs;
+
 	private List<Code> codes;
 	private Map<Point, List<Code>> codeMap;
-	
+	private boolean dirtyCodes;
+
 	private List<Mine> mines;
 	private Map<Point, List<Mine>> mineMap;
+	private boolean dirtyMines;
 	
+	private Settings s;
+
 	public GameMap() {
-		Settings s = Settings.getInstance();
+		s = Settings.getInstance();
 		this.bugs = new ArrayList<>();
 		this.codes = new ArrayList<>();
 		this.mines = new ArrayList<>();
-		
+
 		this.bugMap = new HashMap<>();
 		this.codeMap = new HashMap<>();
 		this.mineMap = new HashMap<>();
 		
+		this.setForked(false);
+
 		if(base == null) {
 			base = new Field[s.getFieldWidth()][s.getFieldHeight()];
 			parseBase();
 		}
 	}
 	
+	private GameMap(GameMap father) {
+		s = Settings.getInstance();
+		this.bugs = father.bugs;
+		this.codes = father.codes;
+		this.mines = father.mines;
+		
+		this.bugMap = father.bugMap;
+		this.codeMap = father.codeMap;
+		this.mineMap = father.mineMap;
+		
+		this.setForked(true);
+	}
+	
+	/**
+	 * Forks the father map. Forks are fast and
+	 * lazily deep copies (i.e. create deep field 
+	 * copies only if needed on write access).
+	 * 
+	 */
+	public GameMap fork() {
+		return new GameMap(this);
+	}
+
+	public Set<Move> validMoves(Point from) {
+		EnumSet<Move> moves;
+
+		switch(base[from.x][from.y]) {
+		case GATE_L:
+		case GATE_R:
+			moves = EnumSet.of(Move.LEFT, Move.RIGHT);
+			break;
+		default:
+			moves = EnumSet.allOf(Move.class);
+			moves.removeIf( move -> from.x+move.x < 0 
+					|| from.y+move.y < 0 
+					|| from.x+move.x >= s.getFieldWidth() 
+					|| from.y+move.y >= s.getFieldHeight()
+					|| base[from.x+move.x][from.y+move.y] == Field.WALL );
+			break;
+		}
+
+		return moves;
+	}
+
+	public Set<Point> validMovePoints(Point from){
+		return validMoves(from).stream()
+				.map(move -> calcMovePoint(from, move))
+				.collect(Collectors.toSet());
+	}
+	
+	public Point calcMovePoint(Point from, Move move) {
+		return new Point(Math.floorMod(from.x+move.x, s.getFieldWidth()),
+		 		   		 Math.floorMod(from.y+move.y, s.getFieldHeight()));
+	}
+
 	public void putToken(Bug bug) {
+		if(dirtyBugs) {
+			bugs = new ArrayList<>(bugs);
+			bugMap = new HashMap<>(bugMap);
+			dirtyBugs = false;
+		}
+		
 		bugs.add(bug);
 		bugMap.computeIfAbsent(bug.getPosition(), k -> new ArrayList<>()).add(bug);
 	}
-	
+
 	public void putToken(Code code) {
+		if(dirtyCodes) {
+			codes = new ArrayList<>(codes);
+			codeMap = new HashMap<>(codeMap);
+			dirtyBugs = false;
+		}
 		codes.add(code);
 		codeMap.computeIfAbsent(code.getPosition(), k -> new ArrayList<>()).add(code);
 	}
-	
+
 	public void putToken(Mine mine) {
+		if(dirtyMines) {
+			mines = new ArrayList<>(mines);
+			mineMap = new HashMap<>(mineMap);
+			dirtyBugs = false;
+		}
 		mines.add(mine);
 		mineMap.computeIfAbsent(mine.getPosition(), k -> new ArrayList<>()).add(mine);
 	}
-	
+
 	public void clearTokens() {
 		this.bugs = new ArrayList<>();
 		this.codes = new ArrayList<>();
 		this.mines = new ArrayList<>();
-		
+
 		this.bugMap = new HashMap<>();
 		this.codeMap = new HashMap<>();
 		this.mineMap = new HashMap<>();
+		
+		this.dirtyBugs = false;
+		this.dirtyCodes = false;
+		this.dirtyMines = false;
 	}
-	
+
+	public boolean isForked() {
+		return forked;
+	}
+
+	public void setForked(boolean forked) {
+		this.forked = forked;	
+		this.dirtyBugs = forked;
+		this.dirtyCodes = forked;
+		this.dirtyMines = forked;
+	}
+
 	private void parseBase() {
-		Settings s = Settings.getInstance();
 		assert(s.getFieldWidth() == 19);
 		assert(s.getFieldHeight() == 15);
-		
+
 		String baseString = ".,.,.,x,.,.,.,.,.,.,.,.,.,.,.,x,.,.,.,"
-						  + ".,x,.,x,.,x,x,x,x,.,x,x,x,x,.,x,.,x,.,"
-						  + ".,x,.,.,.,x,.,.,.,.,.,.,.,x,.,.,.,x,.,"
-						  + ".,x,x,x,.,x,.,x,x,x,x,x,.,x,.,x,x,x,.,"
-						  + ".,x,.,.,.,x,.,.,.,.,.,.,.,x,.,.,.,x,.,"
-						  + ".,.,.,x,.,x,.,x,x,.,x,x,.,x,.,x,.,.,.,"
-						  + "x,.,x,x,.,.,.,x,x,.,x,x,.,.,.,x,x,.,x,"
-						  + "Gl,.,x,x,.,x,x,x,x,.,x,x,x,x,.,x,x,.,Gr,"
-						  + "x,.,x,x,.,.,.,.,.,.,.,.,.,.,.,x,x,.,x,"
-						  + ".,.,.,x,.,x,x,x,x,x,x,x,x,x,.,x,.,.,.,"
-						  + ".,x,.,.,.,.,.,.,x,x,x,.,.,.,.,.,.,x,.,"
-						  + ".,x,.,x,x,.,x,.,.,.,.,.,x,.,x,x,.,x,.,"
-						  + ".,x,.,x,x,.,x,x,x,x,x,x,x,.,x,x,.,x,.,"
-						  + ".,x,.,x,x,.,x,.,.,.,.,.,x,.,x,x,.,x,.,"
-						  + ".,.,.,.,.,.,.,.,x,x,x,.,.,.,.,.,.,.,.";
-		
+				+ ".,x,.,x,.,x,x,x,x,.,x,x,x,x,.,x,.,x,.,"
+				+ ".,x,.,.,.,x,.,.,.,.,.,.,.,x,.,.,.,x,.,"
+				+ ".,x,x,x,.,x,.,x,x,x,x,x,.,x,.,x,x,x,.,"
+				+ ".,x,.,.,.,x,.,.,.,.,.,.,.,x,.,.,.,x,.,"
+				+ ".,.,.,x,.,x,.,x,x,.,x,x,.,x,.,x,.,.,.,"
+				+ "x,.,x,x,.,.,.,x,x,.,x,x,.,.,.,x,x,.,x,"
+				+ "Gl,.,x,x,.,x,x,x,x,.,x,x,x,x,.,x,x,.,Gr,"
+				+ "x,.,x,x,.,.,.,.,.,.,.,.,.,.,.,x,x,.,x,"
+				+ ".,.,.,x,.,x,x,x,x,x,x,x,x,x,.,x,.,.,.,"
+				+ ".,x,.,.,.,.,.,.,x,x,x,.,.,.,.,.,.,x,.,"
+				+ ".,x,.,x,x,.,x,.,.,.,.,.,x,.,x,x,.,x,.,"
+				+ ".,x,.,x,x,.,x,x,x,x,x,x,x,.,x,x,.,x,.,"
+				+ ".,x,.,x,x,.,x,.,.,.,.,.,x,.,x,x,.,x,.,"
+				+ ".,.,.,.,.,.,.,.,x,x,x,.,.,.,.,.,.,.,.";
+
 		String[] baseSplit = baseString.split(",");
-		
+
 		for (int i = 0; i < 19; i++) {
 			for (int j = 0; j < 15; j++) {
 				String b = baseSplit[i+(s.getFieldWidth()*j)];
@@ -116,4 +223,81 @@ public class GameMap {
 		return "GameMap [bugs=" + bugs + ", bugMap=" + bugMap + ", codes=" + codes + ", codeMap=" + codeMap + ", mines="
 				+ mines + ", mineMap=" + mineMap + "]";
 	}
+
+	public List<Bug> getBugs() {
+		return Collections.unmodifiableList(bugs);
+	}
+	
+	public List<Bug> getBugsAt(Point position){
+		return Collections.unmodifiableList(bugMap.get(position));
+	}
+	
+	public List<Bug> removeBugsAt(Point position) {
+		if(dirtyBugs && bugMap.containsKey(position)) {
+			bugs = new ArrayList<>(bugs);
+			bugMap = new HashMap<>(bugMap);
+			dirtyBugs = false;
+		}
+		
+		List<Bug> rmBugs = bugMap.remove(position);
+		
+		if(rmBugs != null) rmBugs.forEach(bugs::remove);
+		else rmBugs = new ArrayList<>();
+		
+		return rmBugs;
+	}
+
+	public List<Code> getCodes() {
+		return Collections.unmodifiableList(codes);
+	}
+	
+	public List<Code> getCodesAt(Point position){
+		return Collections.unmodifiableList(codeMap.get(position));
+	}
+	
+	public List<Code> removeCodesAt(Point position){
+		if(dirtyCodes && codeMap.containsKey(position)) {
+			codes = new ArrayList<>(codes);
+			codeMap = new HashMap<>(codeMap);
+			dirtyCodes = false;
+		}
+		
+		List<Code> rmCodes = codeMap.remove(position);
+		if(rmCodes != null) rmCodes.forEach(codes::remove);
+		else rmCodes = new ArrayList<>();
+		
+		return rmCodes;
+	}
+
+	public List<Mine> getMines() {
+		return Collections.unmodifiableList(mines);
+	}
+	
+	public List<Mine> getMinesAt(Point position){
+		return Collections.unmodifiableList(mineMap.get(position));
+	}
+	
+	public List<Mine> removeMinesAt(Point position){
+		if(dirtyMines && mineMap.containsKey(position)) {
+			mines = new ArrayList<>(mines);
+			mineMap = new HashMap<>(mineMap);
+			dirtyMines = false;
+		}
+		
+		List<Mine> rmMines = mineMap.remove(position);
+		
+		if(rmMines != null) rmMines.forEach(mines::remove);
+		else rmMines = new ArrayList<>();
+
+		return rmMines;
+	}
+	
+	public List<Token> getTokensAt(Point position){
+		ArrayList<Token> tokens = new ArrayList<>();
+		tokens.addAll(getBugsAt(position));
+		tokens.addAll(getCodesAt(position));
+		tokens.addAll(getMinesAt(position));
+		
+		return Collections.unmodifiableList(tokens);
+	}
 }

farbot/src/farbot/game/map/Move.java

@@ -0,0 +1,12 @@
+package farbot.game.map;
+
+public enum Move {
+	UP (0,-1), 
+	DOWN (0,1), 
+	LEFT (-1,0), 
+	RIGHT (1,0);
+	
+	protected final int x;
+	protected final int y;
+	Move(int x, int y) { this.x = x; this.y = y; }
+}

farbot/src/farbot/game/map/Point.java

@@ -0,0 +1,17 @@
+package farbot.game.map;
+
+public class Point extends java.awt.Point{
+
+	private static final long serialVersionUID = -4718250851453184212L;
+
+    public Point() { super(); }
+
+    public Point(Point p) { super(p); }
+
+    public Point(int x, int y) { super(x,y); }
+   	
+	@Override
+	public String toString() {
+		return "(x=" + x + ",y=" + y + ")";
+	}
+}

farbot/src/farbot/game/token/Bug.java

@@ -7,16 +7,37 @@ public class Bug extends Token {
 	
 	private BugAI aiType;
 	
+	public Bug(Bug bug) {
+		this(bug.position.x, bug.position.y, bug.aiType);
+	}
+	
 	public Bug(int x, int y, BugAI ai) {
 		super(x,y);
-		this.setAiType(ai);
+		this.aiType = ai;
 	}
 
 	public BugAI getAiType() {
 		return aiType;
 	}
 
-	public void setAiType(BugAI aiType) {
-		this.aiType = aiType;
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = super.hashCode();
+		result = prime * result + ((aiType == null) ? 0 : aiType.hashCode());
+		return result;
 	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (!super.equals(obj)) return false;
+		if (getClass() != obj.getClass()) return false;
+		
+		Bug other = (Bug) obj;
+	
+		return aiType == other.aiType;
+	}
+
+	
 }

farbot/src/farbot/game/token/Code.java

@@ -1,6 +1,10 @@
 package farbot.game.token;
 
 public class Code extends Token {
+	public Code(Code code) {
+		this(code.position.x, code.position.y);
+	}
+	
 	public Code(int x, int y) {
 		super(x, y);
 	}

farbot/src/farbot/game/token/Mine.java

@@ -3,25 +3,44 @@ package farbot.game.token;
 public class Mine extends Token {
 	private Integer timeToExplode;
 	
+	public Mine(Mine mine) {
+		this(mine.position.x, mine.position.y, mine.timeToExplode);
+	}
+	
 	public Mine(int x, int y) {
 		this(x, y, -1);
 	}
 	
 	public Mine(int x, int y, int timeToExplode) {
 		super(x, y);
-		this.setTimeToExplode(timeToExplode);
+		this.timeToExplode = timeToExplode;
 	}
 
 	public Integer getTimeToExplode() {
 		return timeToExplode;
 	}
 
-	public void setTimeToExplode(Integer timeToExplode) {
-		this.timeToExplode = timeToExplode;
-	}
-
 	@Override
 	public String toString() {
 		return "Mine [timeToExplode=" + timeToExplode + ", getPosition()=" + getPosition() + "]";
 	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = super.hashCode();
+		result = prime * result + ((timeToExplode == null) ? 0 : timeToExplode.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (!super.equals(obj)) return false;
+		if (getClass() != obj.getClass()) return false;
+		
+		Mine other = (Mine) obj;
+		
+		return timeToExplode.equals(other.timeToExplode);
+	}
 }

farbot/src/farbot/game/token/Token.java

@@ -1,9 +1,9 @@
 package farbot.game.token;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
 public abstract class Token {
-	private Point position;
+	Point position;
 	
 	public Token(int x, int y) {
 		setPosition(x, y);
@@ -20,4 +20,23 @@ public abstract class Token {
 	public String toString() {
 		return "Token [position=" + position + "]";
 	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((position == null) ? 0 : position.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) return true;
+		if (obj == null) return false;
+		if (getClass() != obj.getClass()) return false;
+		
+		Token other = (Token) obj;
+
+		return position.equals(other.position);
+	}
 }

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/HackMan2Object.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
 /**
  * io.riddles.hackman2.game.board.Item - Created on 12-6-17

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/board/HackMan2Board.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.board;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/enemy/ChaseAI.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.enemy;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 import java.util.ArrayList;
 
 import io.riddles.hackman2.game.board.HackMan2Board;

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/item/Bomb.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.item;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
 import io.riddles.hackman2.game.HackMan2Object;
 

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/item/Snippet.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.item;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 
 import io.riddles.hackman2.game.HackMan2Object;
 

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/move/MoveType.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.move;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Map;

hack-man-2-engine-development/src/java/io/riddles/hackman2/game/processor/HackMan2Processor.java

@@ -19,7 +19,7 @@
 
 package io.riddles.hackman2.game.processor;
 
-import java.awt.Point;
+import farbot.game.map.Point;
 import java.util.ArrayList;
 import java.util.Comparator;
 

hack-man-2-engine-development/test/groovy/io/riddles/hackman2/game/board/HackMan2BoardSpec.groovy

@@ -22,7 +22,7 @@ package io.riddles.hackman2.game.board
 import io.riddles.hackman2.game.item.Bomb
 import spock.lang.Specification
 
-import java.awt.Point
+import farbot.game.map.Point
 
 /**
  * io.riddles.hackman2.game.board.HackMan2BoardSpec - Created on 13-6-17
@@ -65,13 +65,13 @@ class HackMan2BoardSpec extends Specification {
         ArrayList<String> explosions = board.explodeBombs()
 
         then:
-        explosions.toString() == "[java.awt.Point[x=0,y=0], java.awt.Point[x=1,y=0], " +
-                "java.awt.Point[x=2,y=0], java.awt.Point[x=2,y=1], java.awt.Point[x=2,y=2], " +
-                "java.awt.Point[x=3,y=2], java.awt.Point[x=4,y=2], java.awt.Point[x=0,y=1], " +
-                "java.awt.Point[x=0,y=2], java.awt.Point[x=0,y=3], java.awt.Point[x=0,y=4], " +
-                "java.awt.Point[x=0,y=5], java.awt.Point[x=18,y=0], java.awt.Point[x=18,y=1], " +
-                "java.awt.Point[x=18,y=2], java.awt.Point[x=18,y=3], java.awt.Point[x=18,y=4], " +
-                "java.awt.Point[x=18,y=5], java.awt.Point[x=17,y=0], java.awt.Point[x=16,y=0]]"
+        explosions.toString() == "[farbot.game.map.Point[x=0,y=0], farbot.game.map.Point[x=1,y=0], " +
+                "farbot.game.map.Point[x=2,y=0], farbot.game.map.Point[x=2,y=1], farbot.game.map.Point[x=2,y=2], " +
+                "farbot.game.map.Point[x=3,y=2], farbot.game.map.Point[x=4,y=2], farbot.game.map.Point[x=0,y=1], " +
+                "farbot.game.map.Point[x=0,y=2], farbot.game.map.Point[x=0,y=3], farbot.game.map.Point[x=0,y=4], " +
+                "farbot.game.map.Point[x=0,y=5], farbot.game.map.Point[x=18,y=0], farbot.game.map.Point[x=18,y=1], " +
+                "farbot.game.map.Point[x=18,y=2], farbot.game.map.Point[x=18,y=3], farbot.game.map.Point[x=18,y=4], " +
+                "farbot.game.map.Point[x=18,y=5], farbot.game.map.Point[x=17,y=0], farbot.game.map.Point[x=16,y=0]]"
         board.getBombs().size() == 1
     }
 }

javainterface

@@ -0,0 +1 @@
+Subproject commit 1628e73ebddad23d96ce07ea0d49cf1a955d3f93