Implement singleton for player and portal

Signed-off-by: Chris Cromer <chris@cromer.cl>

src/main/java/cl/cromer/azaraka/Scene.java

@@ -60,7 +60,6 @@ public class Scene extends JComponent implements Constants {
 	/**
 	 * The cells of the game
 	 */
-	//private final Cell[][] cells;
 	private final CopyOnWriteArrayList<CopyOnWriteArrayList<Cell>> cells;
 	/**
 	 * The logger
@@ -89,7 +88,6 @@ public class Scene extends JComponent implements Constants {
 		this.canvas = canvas;
 		loadTextures();
 
-		//cells = new Cell[HORIZONTAL_CELLS][VERTICAL_CELLS];
 		cells = new CopyOnWriteArrayList<>();
 
 		if (GENERATE_SCENE) {
@@ -137,7 +135,7 @@ public class Scene extends JComponent implements Constants {
 				cells.get(x).add(cell);
 
 				if (jsonCells[x][y].type.equals(Player.class.getName())) {
-					cells.get(x).get(y).setObject(new Player(null, cells.get(x).get(y)));
+					cells.get(x).get(y).setObject(Player.getInstance(null, cells.get(x).get(y)));
 				}
 				else if (jsonCells[x][y].type.equals(Enemy.class.getName())) {
 					cells.get(x).get(y).setObject(new Enemy(null, cells.get(x).get(y), null));
@@ -155,7 +153,7 @@ public class Scene extends JComponent implements Constants {
 					cells.get(x).get(y).setObject(new Obstacle(null, cells.get(x).get(y)));
 				}
 				else if (jsonCells[x][y].type.equals(Portal.class.getName())) {
-					cells.get(x).get(y).setObject(new Portal(null, cells.get(x).get(y)));
+					cells.get(x).get(y).setObject(Portal.getInstance(null, cells.get(x).get(y)));
 				}
 
 				for (int k = 0; k < jsonCells[x][y].textures.size(); k++) {
@@ -180,7 +178,7 @@ public class Scene extends JComponent implements Constants {
 		List<Object> objectArrayList = new ArrayList<>();
 
 		// The player has a fixed position
-		cells.get(2).get(1).setObject(new Player(this, cells.get(2).get(1)));
+		cells.get(2).get(1).setObject(Player.getInstance(this, cells.get(2).get(1)));
 		objectArrayList.add(cells.get(2).get(1).getObject());
 
 		for (int i = 0; i < OBSTACLES; i++) {
@@ -203,7 +201,7 @@ public class Scene extends JComponent implements Constants {
 		}
 
 		random = randomCoordinates();
-		cells.get(random[0]).get(random[1]).setObjectOnBottom(new Portal(this, cells.get(random[0]).get(random[1])));
+		cells.get(random[0]).get(random[1]).setObjectOnBottom(Portal.getInstance(this, cells.get(random[0]).get(random[1])));
 		objectArrayList.add(cells.get(random[0]).get(random[1]).getObjectOnBottom());
 
 		// Generate enough keys for the chests that will exist

src/main/java/cl/cromer/azaraka/object/Player.java

@@ -36,6 +36,10 @@ public class Player extends Object implements Constants {
 	 * The maximum health of the player
 	 */
 	public final static int MAX_HEALTH = 20;
+	/**
+	 * There can be only 1 player
+	 */
+	private static Player instance = null;
 	/**
 	 * Objects that the player is carrying
 	 */
@@ -55,7 +59,7 @@ public class Player extends Object implements Constants {
 	 * @param scene The scene the player is in
 	 * @param cell  The cell the player is in
 	 */
-	public Player(Scene scene, Cell cell) {
+	private Player(Scene scene, Cell cell) {
 		super(scene, cell);
 		setLogger(getLogger(this.getClass(), LogLevel.PLAYER));
 		loadPlayerAnimation();
@@ -72,6 +76,24 @@ public class Player extends Object implements Constants {
 		}
 	}
 
+	/**
+	 * Get a unique instance of the player
+	 *
+	 * @param scene The scene the player is in
+	 * @param cell  The cell the player is in
+	 * @return Returns the Player instance
+	 */
+	public static Player getInstance(Scene scene, Cell cell) {
+		if (instance == null) {
+			synchronized (Player.class) {
+				if (instance == null) {
+					instance = new Player(scene, cell);
+				}
+			}
+		}
+		return instance;
+	}
+
 	/**
 	 * Load the player animation
 	 */

src/main/java/cl/cromer/azaraka/object/Portal.java

@@ -29,6 +29,10 @@ import java.util.List;
  * This class handles the portal functionality
  */
 public class Portal extends Object implements Constants {
+	/**
+	 * There can be only 1 portal
+	 */
+	private static Portal instance = null;
 	/**
 	 * The current state of the portal
 	 */
@@ -52,12 +56,30 @@ public class Portal extends Object implements Constants {
 	 * @param scene The scene that contains the portal
 	 * @param cell  The cell the portal is in
 	 */
-	public Portal(Scene scene, Cell cell) {
+	private Portal(Scene scene, Cell cell) {
 		super(scene, cell);
 		setLogger(getLogger(this.getClass(), LogLevel.PORTAL));
 		loadPortalAnimations();
 	}
 
+	/**
+	 * Get a unique instance of the portal
+	 *
+	 * @param scene The scene the portal is in
+	 * @param cell  The cell the portal is in
+	 * @return Returns the Portal instance
+	 */
+	public static Portal getInstance(Scene scene, Cell cell) {
+		if (instance == null) {
+			synchronized (Portal.class) {
+				if (instance == null) {
+					instance = new Portal(scene, cell);
+				}
+			}
+		}
+		return instance;
+	}
+
 	/**
 	 * Load the portal animation
 	 */