Loader.java

   1 package code.kalter.longflight;
   2
   3 import code.kalter.longflight.crypto.CIStream;
   4 import java.io.IOException;
   5 import java.io.InputStream;
   6 import java.util.Vector;
   7 import javax.microedition.lcdui.Image;
   8 import javax.microedition.media.Manager;
   9 import javax.microedition.media.MediaException;
  10 import javax.microedition.media.Player;
  11
  12 /**
  13  * Дабы избежать повторных загрузок из разных мест программы, а так же
  14  * обеспечить загрузку с расшифкой создан это класс
  15  *
  16  * @author KalterFive
  17  */
  18 public class Loader {
  19
  20     private static final int KEY = 5; // шифровальный XOR ключ
  21
  22     private static Loader instance;
  23
  24     public static Loader getInstance() {
  25         if (instance == null) {
  26             instance = new Loader();
  27         }
  28         return instance;
  29     }
  30
  31     private final Vector dump; // все успешно загруженные ресурсы
  32
  33     private Loader() {
  34         dump = new Vector();
  35     }
  36
  37     public Object getObject(String path) {
  38         Object result = null;
  39         for (int i = 0; i < dump.size(); i++) {
  40             ObjectItem item = (ObjectItem) dump.elementAt(i);
  41             if (item.get(path) != null) {
  42                 result = item.get(path);
  43                 break;
  44             }
  45         }
  46         return result;
  47     }
  48
  49     public Image getImage(String path) throws IOException {
  50         Image result = (Image) getObject(path);
  51         if (result == null) {
  52             final InputStream istream = getClass().getResourceAsStream(path);
  53             final InputStream cistream = new CIStream(istream, KEY);
  54             result = Image.createImage(cistream);
  55             cistream.close();
  56             dump.addElement(new ObjectItem(result, path));
  57         }
  58         return result;
  59     }
  60
  61     public Player getPlayer(String path, String type) throws
  62             IOException, MediaException {
  63         Player result = (Player) getObject(path);
  64         if (result == null) {
  65             final InputStream iStream = getClass().getResourceAsStream(path);
  66             result = Manager.createPlayer(iStream, type);
  67             dump.addElement(new ObjectItem(result, path));
  68         }
  69         return result;
  70     }
  71 }