src/se/umu/cs/dit06ajnajs/map/MapSquarePrototypeFactory.java

   1 package se.umu.cs.dit06ajnajs.map;
   2
   3 import java.awt.image.BufferedImage;
   4 import java.io.IOException;
   5 import java.net.URL;
   6 import java.util.HashMap;
   7
   8 import javax.imageio.ImageIO;
   9
  10 /**
  11  * MapSquarePrototypeFactory is used to create new instances of different
  12  * implementations of MapSquare from a String. Implemented as a Singleton.
  13  *
  14  * @author Anton Johansson, dit06ajn@cs.umu.se
  15  * @version 1.0
  16  */
  17 public class MapSquarePrototypeFactory {
  18     // private static Logger logger = Logger.getLogger("AntiTD");
  19
  20     private static final MapSquarePrototypeFactory INSTANCE
  21         = new MapSquarePrototypeFactory();
  22
  23     private java.util.Map<String, MapSquare> squareMap;
  24
  25     /**
  26      * Gets the only instance of this class, if none exists one is created.
  27      *
  28      * @return The only instance of this class.
  29      */
  30     public static MapSquarePrototypeFactory getInstance() {
  31         return INSTANCE;
  32     }
  33
  34     /**
  35      * MapSquarePrototypeFactory initialices all different types of MapSquares
  36      * and puts them in a java.util.Map.
  37      *
  38      * Private constructor makes sure there can only be one instance of this
  39      * class, and that instance is created by the class itself from the first
  40      * invocation of getInstance()
  41      *
  42      */
  43     private MapSquarePrototypeFactory() {
  44         squareMap = new HashMap<String, MapSquare>();
  45
  46         try {
  47             // Create TowerSquare Prototype
  48             URL url = this.getClass().getResource("/resources/grass.jpg");
  49             BufferedImage image = ImageIO.read(url);
  50             squareMap.put("TowerSquare", new TowerSquare(-1, -1, image));
  51
  52             // Create PathSquare Prototype
  53             url = this.getClass().getResource("/resources/path.jpg");
  54             image = ImageIO.read(url);
  55             squareMap.put("PathSquare", new PathSquare(-1, -1, image));
  56
  57             // Create BlockedSquare Prototype
  58             url = this.getClass().getResource("/resources/effielTower.gif");
  59             image = ImageIO.read(url);
  60             squareMap.put("BlockedSquare", new BlockedSquare(-1, -1, image));
  61         } catch (IOException e) {
  62             System.err.println("Couldn't find image. Exception: "
  63                                + e.getMessage());
  64         }
  65     }
  66
  67     /**
  68      * Creates a new instance of a MapSquare with the type specified by the
  69      * first paramter.
  70      *
  71      * @param type A String representing a type exisiting in this factory.
  72      * @param x The x-position of the resulting MapSquare.
  73      * @param y  The y-position of the resulting MapSquare
  74      * @return A newly create MapSquare.
  75      */
  76     public MapSquare createMapSquare(String type, int x, int y) {
  77         MapSquare resultSquare = squareMap.get(type);
  78         if (resultSquare == null) {
  79             throw new IllegalArgumentException("The specified type '" + type
  80                                                + "' doesn't exist");
  81         }
  82         resultSquare = (MapSquare) resultSquare.clone();
  83
  84         resultSquare.setX(x);
  85         resultSquare.setY(y);
  86         return resultSquare;
  87     }
  88
  89     // TODO Överlagra clone() och kasta CloneNotSupportetException för Singelton-mönstret?
  90 }