Class CompositeEventListener

  • All Implemented Interfaces:
    java.util.EventListener, EventListener

    public class CompositeEventListener
    extends java.lang.Object
    implements EventListener
    EventListener implementation forwards events to possibly multiple other EventListeners.
    • Constructor Detail

      • CompositeEventListener

        public CompositeEventListener()
    • Method Detail

      • addEventListener

        public void addEventListener​(EventListener listener)
        Adds an event listener to the broadcaster. It is appended to the list of previously registered listeners (the order of registration defines the calling order).
        Parameters:
        listener - the listener to be added
      • removeEventListener

        public void removeEventListener​(EventListener listener)
        Removes an event listener from the broadcaster. If the event listener is not registered, nothing happens.
        Parameters:
        listener - the listener to be removed
      • hasEventListeners

        public boolean hasEventListeners()
        Indicates whether any listeners have been registered with the broadcaster.
        Returns:
        true if listeners are present, false otherwise
      • processEvent

        public void processEvent​(Event event)
        This method is called for each event that is generated. With the event's ID it is possible to react to certain events. Events can also simply be recorded and presented to a user. It is possible to throw an (unchecked) exception if the processing needs to be aborted because some special event occurred. This way the client can configure the behaviour of the observed application.
        Specified by:
        processEvent in interface EventListener
        Parameters:
        event - the event