Made every class that can be final final

client/src/main/java/envoy/client/Main.java

@@ -17,7 +17,7 @@ import envoy.client.ui.Startup;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.1-beta
  */
-public class Main {
+public final class Main {
 
 	private static final boolean debug = false;
 

client/src/main/java/envoy/client/data/ClientConfig.java

@@ -17,7 +17,7 @@ import envoy.data.Config;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.1-beta
  */
-public class ClientConfig extends Config {
+public final class ClientConfig extends Config {
 
 	private static ClientConfig config;
 

client/src/main/java/envoy/client/data/GroupChat.java

@@ -21,7 +21,7 @@ import envoy.event.GroupMessageStatusChange;
  * @author Maximilian Käfer
  * @since Envoy Client v0.1-beta
  */
-public class GroupChat extends Chat {
+public final class GroupChat extends Chat {
 
 	private final User sender;
 
@@ -41,13 +41,10 @@ public class GroupChat extends Chat {
 	public void read(WriteProxy writeProxy) throws IOException {
 		for (int i = messages.size() - 1; i >= 0; --i) {
 			final GroupMessage gmsg = (GroupMessage) messages.get(i);
-			if (gmsg.getSenderID() != sender.getID()) {
+			if (gmsg.getSenderID() != sender.getID()) if (gmsg.getMemberStatuses().get(sender.getID()) == MessageStatus.READ) break;
-				if (gmsg.getMemberStatuses().get(sender.getID()) == MessageStatus.READ) break;
+			else {
-				else {
+				gmsg.getMemberStatuses().replace(sender.getID(), MessageStatus.READ);
-					gmsg.getMemberStatuses().replace(sender.getID(), MessageStatus.READ);
+				writeProxy.writeMessageStatusChange(new GroupMessageStatusChange(gmsg.getID(), MessageStatus.READ, Instant.now(), sender.getID()));
-					writeProxy
-						.writeMessageStatusChange(new GroupMessageStatusChange(gmsg.getID(), MessageStatus.READ, Instant.now(), sender.getID()));
-				}
 			}
 		}
 		unreadAmount = 0;

client/src/main/java/envoy/client/data/Settings.java

@@ -22,7 +22,7 @@ import envoy.util.SerializationUtils;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-alpha
  */
-public class Settings {
+public final class Settings {
 
 	// Actual settings accessible by the rest of the application
 	private Map<String, SettingsItem<?>> items;
@@ -139,7 +139,9 @@ public class Settings {
 	 *                         before
 	 * @since Envoy Client v0.2-beta
 	 */
-	public void setDownloadSavedWithoutAsking(boolean autosaveDownload) { ((SettingsItem<Boolean>) items.get("autoSaveDownloads")).set(autosaveDownload); }
+	public void setDownloadSavedWithoutAsking(boolean autosaveDownload) {
+		((SettingsItem<Boolean>) items.get("autoSaveDownloads")).set(autosaveDownload);
+	}
 
 	/**
 	 * @return the path where downloads should be saved

client/src/main/java/envoy/client/data/SettingsItem.java

@@ -17,7 +17,7 @@ import javax.swing.JComponent;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class SettingsItem<T> implements Serializable {
+public final class SettingsItem<T> implements Serializable {
 
 	private T		value;
 	private String	userFriendlyName, description;

client/src/main/java/envoy/client/data/commands/SystemCommand.java

@@ -24,7 +24,7 @@ import java.util.function.Supplier;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class SystemCommand implements OnCall {
+public final class SystemCommand implements OnCall {
 
 	protected int relevance;
 

client/src/main/java/envoy/client/data/commands/SystemCommandBuilder.java

@@ -14,7 +14,7 @@ import java.util.function.Consumer;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class SystemCommandBuilder {
+public final class SystemCommandBuilder {
 
 	private int						numberOfArguments;
 	private Consumer<List<String>>	action;

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

@@ -11,7 +11,7 @@ import envoy.event.Event;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-alpha
  */
-public class MessageCreationEvent extends Event<Message> {
+public final class MessageCreationEvent extends Event<Message> {
 
 	private static final long serialVersionUID = 0L;
 

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

@@ -11,7 +11,7 @@ import envoy.event.Event;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-alpha
  */
-public class MessageModificationEvent extends Event<Message> {
+public final class MessageModificationEvent extends Event<Message> {
 
 	private static final long serialVersionUID = 0L;
 

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

@@ -10,7 +10,7 @@ import envoy.event.Event;
  * @author: Maximilian K&aumlfer
  * @since Envoy Client v0.3-alpha
  */
-public class SendEvent extends Event<Event<?>> {
+public final class SendEvent extends Event<Event<?>> {
 
 	private static final long serialVersionUID = 0L;
 

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

@@ -10,7 +10,7 @@ import envoy.event.Event;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-alpha
  */
-public class ThemeChangeEvent extends Event<String> {
+public final class ThemeChangeEvent extends Event<String> {
 
 	private static final long serialVersionUID = 0L;
 

client/src/main/java/envoy/client/net/Client.java

@@ -29,7 +29,7 @@ import envoy.util.SerializationUtils;
  * @author Leon Hofmeister
  * @since Envoy Client v0.1-alpha
  */
-public class Client implements Closeable {
+public final class Client implements Closeable {
 
 	// Connection handling
 	private Socket		socket;

client/src/main/java/envoy/client/net/GroupMessageStatusChangeProcessor.java

@@ -16,7 +16,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Client v0.1-beta
  */
-public class GroupMessageStatusChangeProcessor implements Consumer<GroupMessageStatusChange> {
+public final class GroupMessageStatusChangeProcessor implements Consumer<GroupMessageStatusChange> {
 
 	private static final Logger logger = EnvoyLog.getLogger(GroupMessageStatusChangeProcessor.class);
 

client/src/main/java/envoy/client/net/MessageStatusChangeProcessor.java

@@ -16,7 +16,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class MessageStatusChangeProcessor implements Consumer<MessageStatusChange> {
+public final class MessageStatusChangeProcessor implements Consumer<MessageStatusChange> {
 
 	private static final Logger logger = EnvoyLog.getLogger(MessageStatusChangeProcessor.class);
 

client/src/main/java/envoy/client/net/ReceivedGroupMessageProcessor.java

@@ -17,7 +17,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Client v0.1-beta
  */
-public class ReceivedGroupMessageProcessor implements Consumer<GroupMessage> {
+public final class ReceivedGroupMessageProcessor implements Consumer<GroupMessage> {
 
 	private static final Logger logger = EnvoyLog.getLogger(ReceivedGroupMessageProcessor.class);
 

client/src/main/java/envoy/client/net/ReceivedMessageProcessor.java

@@ -15,7 +15,7 @@ import envoy.event.EventBus;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class ReceivedMessageProcessor implements Consumer<Message> {
+public final class ReceivedMessageProcessor implements Consumer<Message> {
 
 	@Override
 	public void accept(Message message) {

client/src/main/java/envoy/client/net/Receiver.java

@@ -22,7 +22,7 @@ import envoy.util.SerializationUtils;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class Receiver extends Thread {
+public final class Receiver extends Thread {
 
 	private boolean isAlive = true;
 

client/src/main/java/envoy/client/net/WriteProxy.java

@@ -22,7 +22,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.3-alpha
  */
-public class WriteProxy {
+public final class WriteProxy {
 
 	private final Client	client;
 	private final LocalDB	localDB;
@@ -68,9 +68,7 @@ public class WriteProxy {
 	 *
 	 * @since Envoy Client v0.3-alpha
 	 */
-	public void flushCache() {
+	public void flushCache() { localDB.getCacheMap().getMap().values().forEach(Cache::relay); }
-		localDB.getCacheMap().getMap().values().forEach(Cache::relay);
-	}
 
 	/**
 	 * Delivers a message to the server if online. Otherwise the message is cached

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

@@ -22,7 +22,7 @@ import javafx.scene.layout.GridPane;
  * @author Leon Hofmeister
  * @since Envoy Client v0.1-beta
  */
-public class ClearableTextField extends GridPane {
+public final class ClearableTextField extends GridPane {
 
 	private final TextField textField;
 
@@ -88,82 +88,82 @@ public class ClearableTextField extends GridPane {
 	 * @see javafx.scene.control.TextInputControl#promptTextProperty()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final StringProperty promptTextProperty() { return textField.promptTextProperty(); }
+	public StringProperty promptTextProperty() { return textField.promptTextProperty(); }
 
 	/**
 	 * @return the current prompt text
 	 * @see javafx.scene.control.TextInputControl#getPromptText()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final String getPromptText() { return textField.getPromptText(); }
+	public String getPromptText() { return textField.getPromptText(); }
 
 	/**
 	 * @param value the prompt text to display
 	 * @see javafx.scene.control.TextInputControl#setPromptText(java.lang.String)
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final void setPromptText(String value) { textField.setPromptText(value); }
+	public void setPromptText(String value) { textField.setPromptText(value); }
 
 	/**
 	 * @return the current property of the tooltip
 	 * @see javafx.scene.control.Control#tooltipProperty()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final ObjectProperty<Tooltip> tooltipProperty() { return textField.tooltipProperty(); }
+	public ObjectProperty<Tooltip> tooltipProperty() { return textField.tooltipProperty(); }
 
 	/**
 	 * @param value the new tooltip
 	 * @see javafx.scene.control.Control#setTooltip(javafx.scene.control.Tooltip)
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final void setTooltip(Tooltip value) { textField.setTooltip(value); }
+	public void setTooltip(Tooltip value) { textField.setTooltip(value); }
 
 	/**
 	 * @return the current tooltip
 	 * @see javafx.scene.control.Control#getTooltip()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final Tooltip getTooltip() { return textField.getTooltip(); }
+	public Tooltip getTooltip() { return textField.getTooltip(); }
 
 	/**
 	 * @return the current property of the context menu
 	 * @see javafx.scene.control.Control#contextMenuProperty()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final ObjectProperty<ContextMenu> contextMenuProperty() { return textField.contextMenuProperty(); }
+	public ObjectProperty<ContextMenu> contextMenuProperty() { return textField.contextMenuProperty(); }
 
 	/**
 	 * @param value the new context menu
 	 * @see javafx.scene.control.Control#setContextMenu(javafx.scene.control.ContextMenu)
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final void setContextMenu(ContextMenu value) { textField.setContextMenu(value); }
+	public void setContextMenu(ContextMenu value) { textField.setContextMenu(value); }
 
 	/**
 	 * @return the current context menu
 	 * @see javafx.scene.control.Control#getContextMenu()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final ContextMenu getContextMenu() { return textField.getContextMenu(); }
+	public ContextMenu getContextMenu() { return textField.getContextMenu(); }
 
 	/**
 	 * @param value whether this ClearableTextField should be editable
 	 * @see javafx.scene.control.TextInputControl#setEditable(boolean)
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final void setEditable(boolean value) { textField.setEditable(value); }
+	public void setEditable(boolean value) { textField.setEditable(value); }
 
 	/**
 	 * @return the current property whether this ClearableTextField is editable
 	 * @see javafx.scene.control.TextInputControl#editableProperty()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final BooleanProperty editableProperty() { return textField.editableProperty(); }
+	public BooleanProperty editableProperty() { return textField.editableProperty(); }
 
 	/**
 	 * @return whether this {@code ClearableTextField} is editable
 	 * @see javafx.scene.control.TextInputControl#isEditable()
 	 * @since Envoy Client v0.1-beta
 	 */
-	public final boolean isEditable() { return textField.isEditable(); }
+	public boolean isEditable() { return textField.isEditable(); }
 }

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

@@ -24,7 +24,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.1-beta
  */
-public class IconUtil {
+public final class IconUtil {
 
 	private IconUtil() {}
 
@@ -160,7 +160,7 @@ public class IconUtil {
 		BufferedImage image = null;
 		try {
 			image = ImageIO.read(IconUtil.class.getResource(path));
-		} catch (IOException e) {
+		} catch (final IOException e) {
 			EnvoyLog.getLogger(IconUtil.class).log(Level.WARNING, String.format("Could not load image at path %s: ", path), e);
 		}
 		return image;

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

@@ -18,7 +18,7 @@ import envoy.event.EventBus;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-alpha
  */
-public class StatusTrayIcon {
+public final class StatusTrayIcon {
 
 	/**
 	 * The {@link TrayIcon} provided by the System Tray API for controlling the
@@ -85,7 +85,7 @@ public class StatusTrayIcon {
 	public void show() {
 		try {
 			SystemTray.getSystemTray().add(trayIcon);
-		} catch (AWTException e) {}
+		} catch (final AWTException e) {}
 	}
 
 	/**

client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java

@@ -42,7 +42,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Client v0.1-beta
  */
-public class ContactSearchScene {
+public final class ContactSearchScene {
 
 	@FXML
 	private ClearableTextField searchBar;

client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java

@@ -39,7 +39,7 @@ import envoy.util.Bounds;
  * @author Maximilian Käfer
  * @since Envoy Client v0.1-beta
  */
-public class GroupCreationScene {
+public final class GroupCreationScene {
 
 	@FXML
 	private Button createButton;

client/src/main/java/envoy/client/ui/controller/SettingsScene.java

@@ -18,7 +18,7 @@ import envoy.client.ui.settings.*;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.1-beta
  */
-public class SettingsScene {
+public final class SettingsScene {
 
 	@FXML
 	private ListView<SettingsPane> settingsList;

client/src/main/java/envoy/client/ui/listcell/ChatControl.java

@@ -23,7 +23,7 @@ import envoy.data.Group;
  * @author Leon Hofmeister
  * @since Envoy Client v0.1-beta
  */
-public class ChatControl extends HBox {
+public final class ChatControl extends HBox {
 
 	/**
 	 * @param chat the chat to display
@@ -36,7 +36,7 @@ public class ChatControl extends HBox {
 		ImageView contactProfilePic;
 		if (chat.getRecipient() instanceof Group) contactProfilePic = new ImageView(IconUtil.loadIconThemeSensitive("group_icon", 32));
 		else contactProfilePic = new ImageView(IconUtil.loadIconThemeSensitive("user_icon", 32));
-		Rectangle	clip				= new Rectangle();
+		final var clip = new Rectangle();
 		clip.setWidth(32);
 		clip.setHeight(32);
 		clip.setArcHeight(32);
@@ -44,7 +44,7 @@ public class ChatControl extends HBox {
 		contactProfilePic.setClip(clip);
 		getChildren().add(contactProfilePic);
 		// spacing
-		Region leftSpacing = new Region();
+		final var leftSpacing = new Region();
 		leftSpacing.setPrefSize(8, 0);
 		leftSpacing.setMinSize(8, 0);
 		leftSpacing.setMaxSize(8, 0);

client/src/main/java/envoy/client/ui/listcell/ContactControl.java

@@ -18,7 +18,7 @@ import envoy.data.User;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.2-beta
  */
-public class ContactControl extends VBox {
+public final class ContactControl extends VBox {
 
 	/**
 	 * @param contact the contact to display
@@ -36,9 +36,7 @@ public class ContactControl extends VBox {
 			final var	statusLabel	= new Label(status);
 			statusLabel.getStyleClass().add(status.toLowerCase());
 			getChildren().add(statusLabel);
-		} else {
+		} else getChildren().add(new Label(contact.getContacts().size() + " members"));
-			getChildren().add(new Label(contact.getContacts().size() + " members"));
-		}
 		getStyleClass().add("listElement");
 	}
 }

client/src/main/java/envoy/client/ui/listcell/MessageControl.java

@@ -24,7 +24,6 @@ import envoy.client.data.Settings;
 import envoy.client.ui.AudioControl;
 import envoy.client.ui.IconUtil;
 import envoy.client.ui.SceneContext;
-
 import envoy.data.GroupMessage;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
@@ -42,7 +41,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Client v0.1-beta
  */
-public class MessageControl extends Label {
+public final class MessageControl extends Label {
 
 	private boolean ownMessage;
 

client/src/main/java/envoy/client/ui/settings/BugReportPane.java

@@ -21,7 +21,7 @@ import envoy.event.IssueProposal;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class BugReportPane extends OnlyIfOnlineSettingsPane {
+public final class BugReportPane extends OnlyIfOnlineSettingsPane {
 
 	private final Label		titleLabel				= new Label("Suggest a title for the bug:");
 	private final TextField	titleTextField			= new TextField();

client/src/main/java/envoy/client/ui/settings/DownloadSettingsPane.java

@@ -17,7 +17,7 @@ import envoy.client.ui.SceneContext;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class DownloadSettingsPane extends SettingsPane {
+public final class DownloadSettingsPane extends SettingsPane {
 
 	/**
 	 * Constructs a new {@code DownloadSettingsPane}.

client/src/main/java/envoy/client/ui/settings/GeneralSettingsPane.java

@@ -16,7 +16,7 @@ import envoy.event.EventBus;
  * @author Kai S. K. Engelbart
  * @since Envoy Client v0.1-beta
  */
-public class GeneralSettingsPane extends SettingsPane {
+public final class GeneralSettingsPane extends SettingsPane {
 
 	/**
 	 * @since Envoy Client v0.1-beta

client/src/main/java/envoy/client/ui/settings/UserSettingsPane.java

@@ -35,7 +35,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class UserSettingsPane extends OnlyIfOnlineSettingsPane {
+public final class UserSettingsPane extends OnlyIfOnlineSettingsPane {
 
 	private boolean	profilePicChanged, usernameChanged, validPassword;
 	private byte[]	currentImageBytes;

client/src/main/java/envoy/client/util/IssueUtil.java

@@ -10,7 +10,7 @@ package envoy.client.util;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class IssueUtil {
+public final class IssueUtil {
 
 	/**
 	 *

client/src/main/java/envoy/client/util/ReflectionUtil.java

@@ -15,7 +15,7 @@ import javafx.scene.Node;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class ReflectionUtil {
+public final class ReflectionUtil {
 
 	private ReflectionUtil() {}
 

common/src/main/java/envoy/data/Attachment.java

@@ -14,7 +14,7 @@ import java.io.Serializable;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class Attachment implements Serializable {
+public final class Attachment implements Serializable {
 
 	/**
 	 * Defines the type of the attachment.

common/src/main/java/envoy/data/ConfigItem.java

@@ -14,7 +14,7 @@ import java.util.function.Function;
  * @param <T> the type of the config item's value
  * @since Envoy Common v0.1-beta
  */
-public class ConfigItem<T> {
+public final class ConfigItem<T> {
 
 	private final String				commandLong, commandShort;
 	private final Function<String, T>	parseFunction;

common/src/main/java/envoy/data/IDGenerator.java

@@ -12,7 +12,7 @@ import java.io.Serializable;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class IDGenerator implements Serializable {
+public final class IDGenerator implements Serializable {
 
 	private final long	end;
 	private long		current;

common/src/main/java/envoy/data/MessageBuilder.java

@@ -16,13 +16,13 @@ import envoy.data.Message.MessageStatus;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class MessageBuilder {
+public final class MessageBuilder {
 
 	// Mandatory properties without default values
 	private final long senderID, recipientID;
 
 	// Properties with default values
-	private long					id;
+	private final long				id;
 	private Instant					creationDate, receivedDate, readDate;
 	private String					text;
 	private Attachment				attachment;
@@ -69,11 +69,11 @@ public class MessageBuilder {
 	 */
 	public MessageBuilder(Message msg, long recipientID, IDGenerator iDGenerator) {
 		this(msg.getRecipientID(), recipientID, iDGenerator.next());
-		this.attachment		= msg.getAttachment();
+		attachment		= msg.getAttachment();
-		this.creationDate	= Instant.now();
+		creationDate	= Instant.now();
-		this.forwarded		= true;
+		forwarded		= true;
-		this.text			= msg.getText();
+		text			= msg.getText();
-		this.status			= MessageStatus.WAITING;
+		status			= MessageStatus.WAITING;
 	}
 
 	/**
@@ -128,7 +128,7 @@ public class MessageBuilder {
 	 * @since Envoy Common v0.2-alpha
 	 */
 	public GroupMessage buildGroupMessage(Group group) {
-		var memberStatuses = new HashMap<Long, Message.MessageStatus>();
+		final var memberStatuses = new HashMap<Long, Message.MessageStatus>();
 		group.getContacts().forEach(user -> memberStatuses.put(user.getID(), MessageStatus.WAITING));
 		return buildGroupMessage(group, memberStatuses);
 	}

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

@@ -17,7 +17,7 @@ import java.util.function.Consumer;
  * @author Kai S. K. Engelbart
  * @since Envoy v0.2-alpha
  */
-public class EventBus {
+public final class EventBus {
 
 	/**
 	 * Contains all event handler instances registered at this event bus as values

common/src/main/java/envoy/event/GroupCreation.java

@@ -15,7 +15,7 @@ import envoy.data.User;
  * @author Leon Hofmeister
  * @since Envoy Common v0.1-beta
  */
-public class GroupCreation extends Event<String> {
+public final class GroupCreation extends Event<String> {
 
 	private final Set<Long> initialMemberIDs;
 

common/src/main/java/envoy/event/GroupMessageStatusChange.java

@@ -13,7 +13,7 @@ import envoy.data.Message.MessageStatus;
  * @author Maximilian Käfer
  * @since Envoy Common v0.1-beta
  */
-public class GroupMessageStatusChange extends MessageStatusChange {
+public final class GroupMessageStatusChange extends MessageStatusChange {
 
 	private final long memberID;
 

common/src/main/java/envoy/event/GroupResize.java

@@ -17,7 +17,7 @@ import envoy.data.User;
  * @author Leon Hofmeister
  * @since Envoy Common v0.1-beta
  */
-public class GroupResize extends Event<User> {
+public final class GroupResize extends Event<User> {
 
 	private final long				groupID;
 	private final ElementOperation	operation;

common/src/main/java/envoy/event/HandshakeRejection.java

@@ -11,7 +11,7 @@ package envoy.event;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.3-alpha
  */
-public class HandshakeRejection extends Event<String> {
+public final class HandshakeRejection extends Event<String> {
 
 	/**
 	 * Select this value if a given password hash or user name was incorrect.

common/src/main/java/envoy/event/IDGeneratorRequest.java

@@ -11,7 +11,7 @@ package envoy.event;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.3-alpha
  */
-public class IDGeneratorRequest extends Event.Valueless {
+public final class IDGeneratorRequest extends Event.Valueless {
 
 	private static final long serialVersionUID = 1431107413883364583L;
 }

common/src/main/java/envoy/event/IsTyping.java

@@ -11,7 +11,7 @@ package envoy.event;
  * @author Leon Hofmeister
  * @since Envoy Client v0.2-beta
  */
-public class IsTyping extends Event<Long> {
+public final class IsTyping extends Event<Long> {
 
 	private final long destinationID;
 

common/src/main/java/envoy/event/IssueProposal.java

@@ -11,7 +11,7 @@ package envoy.event;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-beta
  */
-public class IssueProposal extends Event<String> {
+public final class IssueProposal extends Event<String> {
 
 	private final String	description;
 	private final boolean	bug;

common/src/main/java/envoy/event/NameChange.java

@@ -14,7 +14,7 @@ import envoy.data.Contact;
  * @author Leon Hofmeister
  * @since Envoy Common v0.1-beta
  */
-public class NameChange extends Event<String> {
+public final class NameChange extends Event<String> {
 
 	private final long id;
 

common/src/main/java/envoy/event/PasswordChangeRequest.java

@@ -10,7 +10,7 @@ import envoy.data.Contact;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-beta
  */
-public class PasswordChangeRequest extends Event<String> {
+public final class PasswordChangeRequest extends Event<String> {
 
 	private final long		id;
 	private final String	oldPassword;

common/src/main/java/envoy/event/PasswordChangeResult.java

@@ -11,7 +11,7 @@ package envoy.event;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-beta
  */
-public class PasswordChangeResult extends Event<Boolean> {
+public final class PasswordChangeResult extends Event<Boolean> {
 
 	private static final long serialVersionUID = 1L;
 

common/src/main/java/envoy/event/ProfilePicChange.java

@@ -8,7 +8,7 @@ package envoy.event;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-beta
  */
-public class ProfilePicChange extends Event<byte[]> {
+public final class ProfilePicChange extends Event<byte[]> {
 
 	private final long id;
 

common/src/main/java/envoy/event/UserStatusChange.java

@@ -11,7 +11,7 @@ import envoy.data.User.UserStatus;
  * @author Leon Hofmeister
  * @since Envoy Common v0.2-alpha
  */
-public class UserStatusChange extends Event<UserStatus> {
+public final class UserStatusChange extends Event<UserStatus> {
 
 	private final long id;
 

common/src/main/java/envoy/event/contact/ContactOperation.java

@@ -14,7 +14,7 @@ import envoy.event.Event;
  * @author Maximilian Käfer
  * @since Envoy Common v0.2-alpha
  */
-public class ContactOperation extends Event<Contact> {
+public final class ContactOperation extends Event<Contact> {
 
 	private final ElementOperation operationType;
 

common/src/main/java/envoy/event/contact/UserSearchRequest.java

@@ -12,7 +12,7 @@ import envoy.event.Event;
  * @author Maximilian Käfer
  * @since Envoy Common v0.2-alpha
  */
-public class UserSearchRequest extends Event<String> {
+public final class UserSearchRequest extends Event<String> {
 
 	private static final long serialVersionUID = 0L;
 

common/src/main/java/envoy/event/contact/UserSearchResult.java

@@ -15,7 +15,7 @@ import envoy.event.Event;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class UserSearchResult extends Event<List<User>> {
+public final class UserSearchResult extends Event<List<User>> {
 
 	private static final long serialVersionUID = 0L;
 

common/src/main/java/envoy/exception/EnvoyException.java

@@ -8,7 +8,7 @@ package envoy.exception;
  * @author Kai S. K. Engelbart
  * @since Envoy v0.1-alpha
  */
-public class EnvoyException extends Exception {
+public final class EnvoyException extends Exception {
 
 	private static final long serialVersionUID = 2096147309395387479L;
 

common/src/main/java/envoy/util/Bounds.java

@@ -12,7 +12,7 @@ import java.util.regex.Pattern;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.1-beta
  */
-public class Bounds {
+public final class Bounds {
 
 	private Bounds() {}
 

common/src/main/java/envoy/util/EnvoyLog.java

@@ -20,7 +20,7 @@ import envoy.data.Config;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.1-beta
  */
-public class EnvoyLog {
+public final class EnvoyLog {
 
 	private static FileHandler		fileHandler;
 	private static StreamHandler	consoleHandler;

common/src/main/java/envoy/util/SerializationUtils.java

@@ -12,7 +12,7 @@ import java.io.*;
  * @author Kai S. K. Engelbart
  * @since Envoy Common v0.2-alpha
  */
-public class SerializationUtils {
+public final class SerializationUtils {
 
 	private SerializationUtils() {}
 

server/src/main/java/envoy/server/Startup.java

@@ -24,7 +24,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class Startup {
+public final class Startup {
 
 	/**
 	 * Stores the configuration used for the whole server

server/src/main/java/envoy/server/data/ConfigItem.java

@@ -14,7 +14,7 @@ import javax.persistence.Table;
  */
 @Entity
 @Table(name = "configuration")
-public class ConfigItem {
+public final class ConfigItem {
 
 	@Id
 	private String	key;

server/src/main/java/envoy/server/data/Group.java

@@ -28,7 +28,7 @@ import javax.persistence.NamedQuery;
 		query = "SELECT g FROM Group g WHERE g.creationDate > :lastSeen AND :user MEMBER OF g.contacts"
 	)
 })
-public class Group extends Contact {
+public final class Group extends Contact {
 
 	/**
 	 * Named query retrieving a group by name (parameter {@code :name}).

server/src/main/java/envoy/server/data/GroupMessage.java

@@ -24,7 +24,7 @@ import envoy.data.Group;
 			+ "OR m.status = envoy.data.Message$MessageStatus.READ AND m.readDate > :lastSeen "
 			+ "OR m.lastStatusChangeDate > :lastSeen)"
 )
-public class GroupMessage extends Message {
+public final class GroupMessage extends Message {
 
 	/**
 	 * Named query retrieving pending group messages sent to a group containing a

server/src/main/java/envoy/server/data/PersistenceManager.java

@@ -19,7 +19,7 @@ import envoy.server.net.ConnectionManager;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class PersistenceManager {
+public final class PersistenceManager {
 
 	private final EntityManager		entityManager	= Persistence.createEntityManagerFactory("envoy").createEntityManager();
 	private final EntityTransaction	transaction		= entityManager.getTransaction();

server/src/main/java/envoy/server/data/ServerConfig.java

@@ -12,7 +12,7 @@ import envoy.data.Config;
  * @author Leon Hofmeister
  * @since Envoy Server v0.2-beta
  */
-public class ServerConfig extends Config {
+public final class ServerConfig extends Config {
 
 	private static ServerConfig config;
 

server/src/main/java/envoy/server/data/User.java

@@ -36,7 +36,7 @@ import envoy.data.User.UserStatus;
 		query = "SELECT u FROM User u WHERE (lower(u.name) LIKE lower(:searchPhrase) AND u <> :context AND :context NOT MEMBER OF u.contacts)"
 	)
 })
-public class User extends Contact {
+public final class User extends Contact {
 
 	/**
 	 * Named query retrieving a user by name (parameter {@code :name}).

server/src/main/java/envoy/server/net/ConnectionManager.java

@@ -19,7 +19,7 @@ import envoy.server.processors.UserStatusChangeProcessor;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class ConnectionManager implements ISocketIdListener {
+public final class ConnectionManager implements ISocketIdListener {
 
 	/**
 	 * Contains all socket IDs that have not yet performed a handshake / acquired

server/src/main/java/envoy/server/net/ObjectMessageProcessor.java

@@ -25,7 +25,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class ObjectMessageProcessor implements IMessageProcessor {
+public final class ObjectMessageProcessor implements IMessageProcessor {
 
 	private final Set<ObjectProcessor<?>> processors;
 

server/src/main/java/envoy/server/net/ObjectMessageReader.java

@@ -19,7 +19,7 @@ import envoy.util.SerializationUtils;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class ObjectMessageReader implements IMessageReader {
+public final class ObjectMessageReader implements IMessageReader {
 
 	private List<Message>	completeMessages	= new ArrayList<>();
 	private Message			nextMessage;

server/src/main/java/envoy/server/net/ObjectWriteProxy.java

@@ -22,7 +22,7 @@ import envoy.util.SerializationUtils;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class ObjectWriteProxy {
+public final class ObjectWriteProxy {
 
 	private final WriteProxy writeProxy;
 

server/src/main/java/envoy/server/processors/ContactOperationProcessor.java

@@ -17,7 +17,7 @@ import envoy.util.EnvoyLog;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class ContactOperationProcessor implements ObjectProcessor<ContactOperation> {
+public final class ContactOperationProcessor implements ObjectProcessor<ContactOperation> {
 
 	private static final ConnectionManager connectionManager = ConnectionManager.getInstance();
 	private static final Logger				logger				= EnvoyLog.getLogger(ContactOperationProcessor.class);

server/src/main/java/envoy/server/processors/GroupCreationProcessor.java

@@ -18,7 +18,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-beta
  */
-public class GroupCreationProcessor implements ObjectProcessor<GroupCreation> {
+public final class GroupCreationProcessor implements ObjectProcessor<GroupCreation> {
 
 	private final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();
 	private final ConnectionManager		connectionManager	= ConnectionManager.getInstance();

server/src/main/java/envoy/server/processors/GroupMessageProcessor.java

@@ -23,7 +23,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-beta
  */
-public class GroupMessageProcessor implements ObjectProcessor<GroupMessage> {
+public final class GroupMessageProcessor implements ObjectProcessor<GroupMessage> {
 
 	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();
 	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();

server/src/main/java/envoy/server/processors/GroupMessageStatusChangeProcessor.java

@@ -24,7 +24,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-beta
  */
-public class GroupMessageStatusChangeProcessor implements ObjectProcessor<GroupMessageStatusChange> {
+public final class GroupMessageStatusChangeProcessor implements ObjectProcessor<GroupMessageStatusChange> {
 
 	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();
 	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();

server/src/main/java/envoy/server/processors/GroupResizeProcessor.java

@@ -14,7 +14,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-beta
  */
-public class GroupResizeProcessor implements ObjectProcessor<GroupResize> {
+public final class GroupResizeProcessor implements ObjectProcessor<GroupResize> {
 
 	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();
 	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();

server/src/main/java/envoy/server/processors/IDGeneratorRequestProcessor.java

@@ -17,7 +17,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class IDGeneratorRequestProcessor implements ObjectProcessor<IDGeneratorRequest> {
+public final class IDGeneratorRequestProcessor implements ObjectProcessor<IDGeneratorRequest> {
 
 	private static final long ID_RANGE = 200;
 

server/src/main/java/envoy/server/processors/IsTypingProcessor.java

@@ -18,7 +18,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Leon Hofmeister
  * @since Envoy Server v0.2-beta
  */
-public class IsTypingProcessor implements ObjectProcessor<IsTyping> {
+public final class IsTypingProcessor implements ObjectProcessor<IsTyping> {
 
 	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();
 	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();

server/src/main/java/envoy/server/processors/IssueProposalProcessor.java

@@ -23,7 +23,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Server v0.2-beta
  */
-public class IssueProposalProcessor implements ObjectProcessor<IssueProposal> {
+public final class IssueProposalProcessor implements ObjectProcessor<IssueProposal> {
 
 	private static final Logger logger = EnvoyLog.getLogger(IssueProposalProcessor.class);
 

server/src/main/java/envoy/server/processors/MessageProcessor.java

@@ -23,7 +23,7 @@ import envoy.util.EnvoyLog;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class MessageProcessor implements ObjectProcessor<Message> {
+public final class MessageProcessor implements ObjectProcessor<Message> {
 
 	private static final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();
 	private static final ConnectionManager	connectionManager	= ConnectionManager.getInstance();

server/src/main/java/envoy/server/processors/MessageStatusChangeProcessor.java

@@ -19,7 +19,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class MessageStatusChangeProcessor implements ObjectProcessor<MessageStatusChange> {
+public final class MessageStatusChangeProcessor implements ObjectProcessor<MessageStatusChange> {
 
 	private final ConnectionManager		connectionManager	= ConnectionManager.getInstance();
 	private final PersistenceManager	persistenceManager	= PersistenceManager.getInstance();

server/src/main/java/envoy/server/processors/NameChangeProcessor.java

@@ -15,7 +15,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Leon Hofmeister
  * @since Envoy Server Standalone v0.1-beta
  */
-public class NameChangeProcessor implements ObjectProcessor<NameChange> {
+public final class NameChangeProcessor implements ObjectProcessor<NameChange> {
 
 	private static final PersistenceManager persistenceManager = PersistenceManager.getInstance();
 

server/src/main/java/envoy/server/processors/PasswordChangeRequestProcessor.java

@@ -18,7 +18,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Server v0.2-beta
  */
-public class PasswordChangeRequestProcessor implements ObjectProcessor<PasswordChangeRequest> {
+public final class PasswordChangeRequestProcessor implements ObjectProcessor<PasswordChangeRequest> {
 
 	@Override
 	public void process(PasswordChangeRequest event, long socketID, ObjectWriteProxy writeProxy) throws IOException {

server/src/main/java/envoy/server/processors/ProfilePicChangeProcessor.java

@@ -13,7 +13,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Leon Hofmeister
  * @since Envoy Server v0.2-beta
  */
-public class ProfilePicChangeProcessor implements ObjectProcessor<ProfilePicChange> {
+public final class ProfilePicChangeProcessor implements ObjectProcessor<ProfilePicChange> {
 
 	@Override
 	public void process(ProfilePicChange event, long socketID, ObjectWriteProxy writeProxy) throws IOException {}

server/src/main/java/envoy/server/processors/UserSearchProcessor.java

@@ -20,7 +20,7 @@ import envoy.server.net.ObjectWriteProxy;
  * @author Maximilian Käfer
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class UserSearchProcessor implements ObjectProcessor<UserSearchRequest> {
+public final class UserSearchProcessor implements ObjectProcessor<UserSearchRequest> {
 
 	/**
 	 * Writes a list of contacts to the client containing all {@link Contact}s

server/src/main/java/envoy/server/processors/UserStatusChangeProcessor.java

@@ -19,7 +19,7 @@ import envoy.util.EnvoyLog;
  * @author Leon Hofmeister
  * @since Envoy Server Standalone v0.1-alpha
  */
-public class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChange> {
+public final class UserStatusChangeProcessor implements ObjectProcessor<UserStatusChange> {
 
 	private static ObjectWriteProxy writeProxy;
 

server/src/main/java/envoy/server/util/PasswordUtil.java

@@ -19,7 +19,7 @@ import javax.crypto.spec.PBEKeySpec;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-beta
  */
-public class PasswordUtil {
+public final class PasswordUtil {
 
 	private static final int	ITERATIONS				= 1000;
 	private static final int	KEY_LENGTH				= 64 * 8;

server/src/main/java/envoy/server/util/VersionUtil.java

@@ -13,7 +13,7 @@ import java.util.regex.Pattern;
  * @author Kai S. K. Engelbart
  * @since Envoy Server Standalone v0.1-beta
  */
-public class VersionUtil {
+public final class VersionUtil {
 
 	/**
 	 * The minimal client version compatible with this server.