Examples of org.puremvc.java.multicore.patterns.observer.Observer

org.puremvc.java.multicore.patterns.observer.Observer

A base IObserver implementation.

An Observer is an object that encapsulates information about an interested object with a method that should be called when a particular INotification is broadcast.

In PureMVC, the Observer class assumes these responsibilities:

Encapsulate the notification (callback) method of the interested object.
Encapsulate the notification context (this) of the interested object.
Provide methods for setting the notification method and context.
Provide a method for notifying the interested object.

@see org.puremvc.java.core.view.View View @see org.puremvc.java.patterns.observer.Notification Notification

   * @param command
   *            an instance of <code>ICommand</code>
   */
  public void registerCommand(String notificationName, ICommand command) {
    if (null != this.commandMap.put(notificationName, command)) return;
    this.view.registerObserver(notificationName, new Observer(new IFunction() {
      public void onNotification(INotification notification) {
        executeCommand(notification);
      }
    }, this ) );
  }

    List<IObserver> observers = observerMap.get(notificationName);


    if (observers != null) {
      // find the observer for the notifyContext
      for(int i=0;i<observers.size();i++) {
        Observer observer = (Observer) observers.get(i);
        if (observer.compareNotifyContext(notifyContext) == true) {
          observers.remove(observer);
        }
      }
      // Also, when a Notification's Observer list length falls to
      // zero, delete the notification key from the observer map

            mediator.handleNotification(notification);
          }
        };


        // Create Observer
        Observer observer = new Observer(function, mediator);


        // Register Mediator as Observer for its list of Notification
        // interests
        for (int i = 0; i < noteInterests.length; i++) {
          registerObserver(noteInterests[i], observer);

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