Added user list serialization to LocalDB

* Added user list to LocalDB
* Removed client user from LocalDB constructor

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

@@ -34,9 +34,11 @@ import envoy.schema.User;
  */
 public class LocalDB {
 
-	private File			localDB;
-	private User			sender;
+	private File		localDBFile, usersFile;
+	private User		user;
+	private List<User>	users	= new ArrayList<>();
 	private List<Chat>	chats	= new ArrayList<>();
+
 	private ObjectFactory	objectFactory	= new ObjectFactory();
 	private DatatypeFactory	datatypeFactory;
 
@@ -47,13 +49,12 @@ public class LocalDB {
 	private static final Logger logger = Logger.getLogger(LocalDB.class.getSimpleName());
 
 	/**
-	 * Constructs an empty local database.
+	 * Constructs an empty local database. To serialize any chats to the file
+	 * system, call {@link LocalDB#initializeDBFile(File)}.
 	 *
-	 * @param sender the user that is logged in with this client
 	 * @since Envoy v0.1-alpha
 	 */
-	public LocalDB(User sender) {
-		this.sender = sender;
+	public LocalDB() {
 		try {
 			datatypeFactory = DatatypeFactory.newInstance();
 		} catch (DatatypeConfigurationException e) {
@@ -70,10 +71,17 @@ public class LocalDB {
 	 * @since Envoy v0.1-alpha
 	 */
 	public void initializeDBFile(File localDBDir) throws EnvoyException {
+		if (user == null) throw new NullPointerException("Client user is null");
 		if (localDBDir.exists() && !localDBDir.isDirectory())
 			throw new EnvoyException(String.format("LocalDBDir '%s' is not a directory!", localDBDir.getAbsolutePath()));
-		localDB = new File(localDBDir, sender.getID() + ".db");
-		if (localDB.exists()) loadFromLocalDB();
+		usersFile	= new File(localDBDir, "users.db");
+		localDBFile	= new File(localDBDir, user.getID() + ".db");
+		try {
+			loadUsers();
+			loadChats();
+		} catch (ClassNotFoundException | IOException e) {
+			throw new EnvoyException(e);
+		}
 	}
 
 	/**
@@ -82,29 +90,46 @@ public class LocalDB {
 	 * @throws IOException if something went wrong during saving
 	 * @since Envoy v0.1-alpha
 	 */
-	public void saveToLocalDB() throws IOException {
-		localDB.getParentFile().mkdirs();
-		localDB.createNewFile();
-		try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(localDB))) {
-			out.writeObject(chats);
-		} catch (IOException ex) {
-			throw ex;
-		}
+	public void save() throws IOException {
+		// Save users
+		write(usersFile, users);
+
+		// Save chats
+		write(localDBFile, chats);
 	}
 
+	@SuppressWarnings("unchecked")
+	private void loadUsers() throws ClassNotFoundException, IOException { users = read(usersFile, ArrayList.class); }
+
 	/**
 	 * Loads all chats saved by Envoy for the client user.
 	 *
 	 * @throws EnvoyException         if something fails while loading.
+	 * @throws IOException
+	 * @throws ClassNotFoundException
 	 * @since Envoy v0.1-alpha
 	 */
 	@SuppressWarnings("unchecked")
-	private void loadFromLocalDB() throws EnvoyException {
-		try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(localDB))) {
-			Object obj = in.readObject();
-			if (obj instanceof ArrayList<?>) chats = (ArrayList<Chat>) obj;
+	private void loadChats() throws ClassNotFoundException, IOException { chats = read(localDBFile, ArrayList.class); }
+
+	private <T> T read(File file, Class<T> serializedClass) throws ClassNotFoundException, IOException {
+		try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(file))) {
+			return serializedClass.cast(in.readObject());
 		} catch (ClassNotFoundException | IOException e) {
-			throw new EnvoyException(e);
+			throw e;
+		}
+	}
+
+	private <T> void write(File file, T obj) throws IOException {
+		if (file == null) throw new NullPointerException("File is null");
+		if (!file.exists()) {
+			file.getParentFile().mkdirs();
+			file.createNewFile();
+		}
+		try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file))) {
+			out.writeObject(obj);
+		} catch (IOException e) {
+			throw e;
 		}
 	}
 
@@ -118,7 +143,7 @@ public class LocalDB {
 	 */
 	public Message createMessage(String textContent, long recipientID) {
 		Message.Metadata metaData = objectFactory.createMessageMetadata();
-		metaData.setSender(sender.getID());
+		metaData.setSender(user.getID());
 		metaData.setRecipient(recipientID);
 		metaData.setState(MessageState.WAITING);
 		metaData.setDate(datatypeFactory.newXMLGregorianCalendar(Instant.now().toString()));
@@ -280,6 +305,16 @@ public class LocalDB {
 	 */
 	public void clearUnreadMessagesSync() { unreadMessagesSync.getMessages().clear(); }
 
+	/**
+	 * @return the users
+	 */
+	public List<User> getUsers() { return users; }
+
+	/**
+	 * @param users the users to set
+	 */
+	public void setUsers(List<User> users) { this.users = users; }
+
 	/**
 	 * @return all saved {@link Chat} objects that list the client user as the
 	 *         sender
@@ -288,8 +323,19 @@ public class LocalDB {
 	public List<Chat> getChats() { return chats; }
 
 	/**
-	 * @return the {@link User} who initialized the local database
-	 * @since Envoy v0.1-alpha
+	 * @param chats the chats to set
 	 */
-	public User getUser() { return sender; }
+	public void setChats(List<Chat> chats) { this.chats = chats; }
+
+	/**
+	 * @return the {@link User} who initialized the local database
+	 * @since Envoy v0.2-alpha
+	 */
+	public User getUser() { return user; }
+
+	/**
+	 * @param user the user to set
+	 * @since Envoy v0.2-alpha
+	 */
+	public void setUser(User user) { this.user = user; }
 }

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

@@ -86,7 +86,7 @@ public class ChatWindow extends JFrame {
 			@Override
 			public void windowClosing(WindowEvent evt) {
 				try {
-					localDB.saveToLocalDB();
+					localDB.save();
 					Settings.getInstance().save();
 				} catch (IOException e1) {
 					e1.printStackTrace();

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

@@ -68,7 +68,8 @@ public class Startup {
 		}
 
 		// Load the local database
-		LocalDB localDB = new LocalDB(client.getSender());
+		LocalDB localDB = new LocalDB();
+		localDB.setUser(client.getSender());
 		try {
 			localDB.initializeDBFile(config.getLocalDB());
 		} catch (EnvoyException e) {