tim/prune/UpdateMessageBroker.java

   1 package tim.prune;
   2
   3 /**
   4  * Class responsible for distributing update information
   5  * to all registered listeners
   6  */
   7 public abstract class UpdateMessageBroker
   8 {
   9         private static final int MAXIMUM_NUMBER_SUBSCRIBERS = 6;
  10         private static DataSubscriber[] _subscribers = new DataSubscriber[MAXIMUM_NUMBER_SUBSCRIBERS];
  11         private static int _subscriberNum = 0;
  12
  13
  14         /**
  15          * Add a data subscriber to the list
  16          * @param inSub DataSubscriber to add
  17          */
  18         public static void addSubscriber(DataSubscriber inSub)
  19         {
  20                 _subscribers[_subscriberNum] = inSub;
  21                 _subscriberNum++;
  22         }
  23
  24
  25         /**
  26          * Send a message to all subscribers that
  27          * the data has been updated
  28          */
  29         public static void informSubscribers()
  30         {
  31                 informSubscribers(DataSubscriber.ALL);
  32         }
  33
  34
  35         /**
  36          * Send message to all subscribers
  37          * @param inChange Change that occurred
  38          */
  39         public static void informSubscribers(byte inChange)
  40         {
  41                 for (int i=0; i<_subscribers.length; i++)
  42                 {
  43                         if (_subscribers[i] != null)
  44                         {
  45                                 _subscribers[i].dataUpdated(inChange);
  46                         }
  47                 }
  48         }
  49
  50         /**
  51          * Send message to all subscribers
  52          * @param inMessage message to display informing of action completed
  53          */
  54         public static void informSubscribers(String inMessage)
  55         {
  56                 for (int i=0; i<_subscribers.length; i++)
  57                 {
  58                         if (_subscribers[i] != null)
  59                         {
  60                                 _subscribers[i].actionCompleted(inMessage);
  61                         }
  62                 }
  63         }
  64 }