Add EventArgs event to have an event with data passed

src/juard/event/EventArgs.java

@@ -0,0 +1,83 @@
+package juard.event;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The EventArgs is a simple event but can handle arguments passed through to the handler.
+ * 
+ * @author hauke
+ *
+ */
+public class EventArgs
+{
+	/**
+	 * Provides a method that will be fired a certain events this handler is registered to.
+	 * 
+	 * @author hauke
+	 *
+	 */
+	public interface EventArgsHandler
+	{
+		/**
+		 * This method will be called when event is fired.
+		 * 
+		 * @param data
+		 *            Some data that should be send from sender to receiver.
+		 */
+		public void handleEvent(Object... data);
+	}
+
+	private List<EventArgsHandler> _handlerList;
+
+	/**
+	 * Creates a new Event.
+	 */
+	public EventArgs()
+	{
+		_handlerList = new ArrayList<>();
+	}
+
+	/**
+	 * Registers the given event handler.
+	 * 
+	 * Duplicates are allowed.
+	 * 
+	 * @param eventHandler
+	 *            The handler to register.
+	 */
+	public void add(EventArgsHandler eventHandler)
+	{
+		_handlerList.add(eventHandler);
+	}
+
+	/**
+	 * Notified all registered event handler.
+	 * 
+	 * @param data
+	 *            Some data that should be passed to the handler.
+	 */
+	public void fireEvent(Object... data)
+	{
+		for (EventArgsHandler eventHandler : _handlerList)
+		{
+			eventHandler.handleEvent(data);
+		}
+	}
+
+	/**
+	 * Removes all registered listeners from this event.
+	 */
+	public void clean()
+	{
+		_handlerList.clear();
+	}
+
+	/**
+	 * @return The amount of registered observers. Note that duplicates are allowed.
+	 */
+	public int countObservers()
+	{
+		return _handlerList.size();
+	}
+}