Added Javadoc to event related classes and StatusTrayIcon

src/main/java/envoy/client/LocalDB.java

@@ -49,7 +49,6 @@ public class LocalDB {
 	 * @param client the user that is logged in with this client
 	 * @since Envoy v0.1-alpha
 	 */
-
 	public LocalDB(User sender) {
 		this.sender = sender;
 		try {

src/main/java/envoy/client/event/Event.java

@@ -6,6 +6,7 @@ package envoy.client.event;
  * Created: <strong>04.12.2019</strong><br>
  * 
  * @author Kai S. K. Engelbart
+ * @since Envoy v0.2-alpha
  */
 public interface Event<T> {
 

src/main/java/envoy/client/event/EventBus.java

@@ -5,28 +5,67 @@ import java.util.Arrays;
 import java.util.List;
 
 /**
- * Project: <strong>envoy-clientChess</strong><br>
- * File: <strong>EventBus.javaEvent.java</strong><br>
+ * This class handles events by allowing {@link EventHandler} object to register
+ * themselves and then be notified about certain events dispatched by the event
+ * bus.<br>
+ * <br>
+ * The event bus is a singleton and can be used across the entire application to
+ * guarantee the propagation of events.
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>EventBus.java</strong><br>
  * Created: <strong>04.12.2019</strong><br>
- *
+ * 
  * @author Kai S. K. Engelbart
+ * @since Envoy v0.2-alpha
  */
 public class EventBus {
 
-	private static EventBus eventBus;
-
+	/**
+	 * Contains all {@link EventHandler} instances registered at this
+	 * {@link EventBus}.
+	 */
 	private List<EventHandler> handlers = new ArrayList<>();
 
+	/**
+	 * The singleton instance of this {@link EventBus} that is used across the
+	 * entire application.
+	 */
+	private static EventBus eventBus = new EventBus();
+
+	/**
+	 * This constructor is not accessible from outside this class because a
+	 * singleton instance of it is provided by the {@link EventBus#getInstance()}
+	 * method.
+	 */
 	private EventBus() {}
 
-	public static EventBus getInstance() {
-		if (eventBus == null) eventBus = new EventBus();
-		return eventBus;
-	}
+	/**
+	 * @return the singleton instance of the {@link EventBus}
+	 * @since Envoy v0.2-alpha
+	 */
+	public static EventBus getInstance() { return eventBus; }
 
+	/**
+	 * Registers a list of {@link EventHandler} objects to be notified when a
+	 * {@link Event} is dispatched that they are subscribed to.
+	 * 
+	 * @param handlers the {@link EventHandler} objects to register
+	 * @since Envoy v0.2-alpha
+	 */
 	public void register(EventHandler... handlers) { this.handlers.addAll(Arrays.asList(handlers)); }
 
+	/**
+	 * Dispatches a {@link Event} to every {@link EventHandler} subscribed to it.
+	 * 
+	 * @param event the {@link Event} to dispatch
+	 * @since Envoy v0.2-alpha
+	 */
 	public void dispatch(Event<?> event) { handlers.stream().filter(h -> h.supports().contains(event.getClass())).forEach(h -> h.handle(event)); }
 
+	/**
+	 * @return a list of all {@link EventHandler} instances currently registered at
+	 *         this {@link EventBus}
+	 * @since Envoy v0.2-alpha
+	 */
 	public List<EventHandler> getHandlers() { return handlers; }
 }

src/main/java/envoy/client/ui/StatusTrayIcon.java

@@ -27,8 +27,20 @@ import envoy.exception.EnvoyException;
  */
 public class StatusTrayIcon implements EventHandler {
 
+	/**
+	 * The {@link TrayIcon} provided by the System Tray API for controlling the
+	 * system tray. This includes displaying the icon, but also creating
+	 * notifications when new messages are received.
+	 */
 	private TrayIcon trayIcon;
 
+	/**
+	 * Creates a {@link StatusTrayIcon} with the Envoy logo, a tool tip and a pop-up
+	 * menu.
+	 * 
+	 * @throws EnvoyException if the currently used OS does not support the System
+	 *                        Tray API
+	 */
 	public StatusTrayIcon() throws EnvoyException {
 		if (!SystemTray.isSupported()) throw new EnvoyException("The Envoy tray icon is not supported.");
 
@@ -50,7 +62,9 @@ public class StatusTrayIcon implements EventHandler {
 	/**
 	 * Makes this {@link StatusTrayIcon} appear in the system tray.
 	 *
-	 * @throws EnvoyException
+	 * @throws EnvoyException if the status icon could not be attaches to the system
+	 *                        tray for system-internal reasons
+	 * @since Envoy v0.2-alpha
 	 */
 	public void show() throws EnvoyException {
 		try {
@@ -61,13 +75,23 @@ public class StatusTrayIcon implements EventHandler {
 	}
 
 	/**
-	 * Notifies the user of a message by displaying a pop-up.
+	 * Notifies the user of a message by displaying a pop-up every time a new
+	 * message is received.
+	 * 
+	 * @since Envoy v0.2-alpha
 	 */
 	@Override
 	public void handle(Event<?> event) {
 		trayIcon.displayMessage("New message received", ((MessageCreationEvent) event).get().getContent().get(0).getText(), MessageType.INFO);
 	}
 
+	/**
+	 * The {@link StatusTrayIcon} only reacts to {@link MessageCreationEvent}
+	 * instances which signify newly received messages.
+	 * 
+	 * @return A set with the single element {@code MessageCreationEvent.class}
+	 * @since Envoy v0.2-alpha
+	 */
 	@Override
 	public Set<Class<? extends Event<?>>> supports() {
 		Set<Class<? extends Event<?>>> supportedEvents = new HashSet<>();