Merge pull request #20 from informatik-ag-ngl/f/local_db

Added local database

.gitignore

@@ -1 +1,2 @@
 /target/
+/localDB/

src/main/java/envoy/client/Chat.java

@@ -1,11 +1,15 @@
 package envoy.client;
 
+import java.io.Serializable;
+
 import javax.swing.DefaultListModel;
 
 import envoy.schema.Message;
 import envoy.schema.User;
 
-public class Chat {
+public class Chat implements Serializable {
+
+	private static final long serialVersionUID = -7751248474547242056L;
 	
 	private User						recipient;
 	private DefaultListModel<Message>	model	= new DefaultListModel<>();

src/main/java/envoy/client/Config.java

@@ -1,5 +1,6 @@
 package envoy.client;
 
+import java.io.File;
 import java.util.Properties;
 
 /**
@@ -14,26 +15,27 @@ public class Config {
 
 	private String	server;
 	private int		port;
+	private File	localDB;
 
 	/**
-	 * Defaults to the {@code server.properties} file for information.
+	 * Defaults to the {@code client.properties} file for information.
 	 * 
-	 * 
-	 * @param properties - The two options for internet connection <strong>
-	 *                   server</strong> and <strong> port</strong>
+	 * @param properties a {@link Properties} object containing information about
+	 *                   the server and port, as well as the path to the local
+	 *                   database
 	 * @since Envoy v0.1-alpha
 	 */
 	public void load(Properties properties) {
 		if (properties.containsKey("server")) server = properties.getProperty("server");
 		if (properties.containsKey("port")) port = Integer.parseInt(properties.getProperty("port"));
+		localDB = new File(properties.getProperty("localDB", ".\\localDB"));
 	}
 
 	/**
-	 * Sets the server and the port via command line properties --server/ -s and
-	 * --port/ -p.
+	 * Sets the server, port and localDB path via command line properties --server /
+	 * -s, --port / -p and --localDB / -db.
 	 * 
-	 * @param args {@code --server} or {@code -s} followed by the specified URL
-	 *             and {@code --port} or {@code -p} followed by a 4-digit Integer
+	 * @param args the command line arguments to parse
 	 * @since Envoy v0.1-alpha
 	 */
 	public void load(String[] args) {
@@ -47,42 +49,60 @@ public class Config {
 				case "-p":
 					port = Integer.parseInt(args[++i]);
 					break;
+				case "--localDB":
+				case "-db":
+					localDB = new File(args[++i]);
 			}
 	}
 
 	/**
-	 * @return true if server and port are known.
+	 * @return {@code true} if server, port and localDB directory are known.
 	 * @since Envoy v0.1-alpha
 	 */
-	public boolean isInitialized() { return server != null && !server.isEmpty() && port > 0; }
+	public boolean isInitialized() { return server != null && !server.isEmpty() && port > 0 && port < 65566 && localDB != null; }
 
 	/**
-	 * @return the URL of our website
+	 * @return the host name of the Envoy server
 	 * @since Envoy v0.1-alpha
 	 */
 	public String getServer() { return server; }
 
 	/**
-	 * Changes the default URL.
-	 * Exclusively meant for developing reasons. (localhost)
+	 * Changes the default server host name.
+	 * Exclusively intended for development purposes.
 	 * 
-	 * @param server the URL where wish to host Envoy
+	 * @param server the host name of the Envoy server
 	 * @since Envoy v0.1-alpha
 	 */
 	public void setServer(String server) { this.server = server; }
 
 	/**
-	 * @return the port at which Envoy is located in the Server
+	 * @return the port at which the Envoy server is located on the host
 	 * @since Envoy v0.1-alpha
 	 */
 	public int getPort() { return port; }
 
 	/**
 	 * Changes the default port.
-	 * Exclusively meant for developing reasons. (localhost)
+	 * Exclusively intended for development purposes.
 	 * 
-	 * @param port the port where we wish to connect to {@code Envoy}.
+	 * @param port the port where an Envoy server is located
 	 * @since Envoy v0.1-alpha
 	 */
 	public void setPort(int port) { this.port = port; }
+
+	/**
+	 * @return the local database specific to the client user
+	 * @since Envoy v0.1-alpha
+	 **/
+	public File getLocalDB() { return localDB; }
+
+	/**
+	 * Changes the default local database.
+	 * Exclusively intended for development purposes.
+	 *
+	 * @param the file containing the local database
+	 * @since Envoy v0.1-alpha
+	 **/
+	public void setLocalDB(File localDB) { this.localDB = localDB; }
 }

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

@@ -0,0 +1,96 @@
+package envoy.client;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import envoy.exception.EnvoyException;
+import envoy.schema.User;
+
+/**
+ * Project: <strong>envoy-client</strong><br>
+ * File: <strong>LocalDB.java</strong><br>
+ * Created: <strong>27.10.2019</strong><br>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy v0.1-alpha
+ */
+public class LocalDB {
+
+	private File		localDB;
+	private User		sender;
+	private List<Chat>	chats	= new ArrayList<>();
+
+	/**
+	 * Constructs an empty local database.
+	 *
+	 * @param sender the user that is logged in with this client
+	 * @since Envoy v0.1-alpha
+	 **/
+	public LocalDB(User sender) { this.sender = sender; }
+
+	/**
+	 * Initializes the local database and fills it with values
+	 * if the user has already sent or received messages.
+	 *
+	 * @param localDBDir the directory where we wish to save/load the database from.
+	 * @throws EnvoyException if the directory selected is not an actual directory.
+	 * @since Envoy v0.1-alpha
+	 **/
+	public void initializeDBFile(File localDBDir) throws EnvoyException {
+		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();
+	}
+
+	/**
+	 * Saves the database into a file for future use.
+	 *
+	 * @throws IOException if something went wrong during saving
+	 * @since Envoy v0.1-alpha
+	 **/
+	public void saveToLocalDB() {
+		try {
+			localDB.getParentFile().mkdirs();
+			localDB.createNewFile();
+		} catch (IOException e) {
+			e.printStackTrace();
+			System.err.println("unable to save the messages");
+		}
+		try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(localDB))) {
+			out.writeObject(chats);
+		} catch (IOException ex) {
+			ex.printStackTrace();
+			System.err.println("unable to save the messages");
+		}
+	}
+
+	/**
+	 * Loads all chats saved by Envoy for the client user.
+	 *
+	 * @throws EnvoyException if something fails while loading.
+	 * @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;
+		} catch (ClassNotFoundException | IOException e) {
+			throw new EnvoyException(e);
+		}
+	}
+
+	/**
+	 * @return all saves {@link Chat} objects that list the client user as the
+	 *         sender
+	 * @since Envoy v0.1-alpha
+	 **/
+	public List<Chat> getChats() { return chats; }
+}

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

@@ -6,8 +6,8 @@ import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.Insets;
-import java.util.ArrayList;
-import java.util.List;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent;
 
 import javax.swing.DefaultListModel;
 import javax.swing.JButton;
@@ -25,6 +25,7 @@ import javax.swing.border.EmptyBorder;
 
 import envoy.client.Chat;
 import envoy.client.Client;
+import envoy.client.LocalDB;
 import envoy.schema.Message;
 import envoy.schema.Messages;
 import envoy.schema.User;
@@ -47,19 +48,27 @@ public class ChatWindow extends JFrame {
 	private JPanel contentPane = new JPanel();
 
 	private Client	client;
+	private LocalDB	localDB;
 
 	private JList<User>	userList	= new JList<>();
-	private List<Chat>	partnerChatList	= new ArrayList<Chat>();
 	private Chat		currentChat;
 
-	public ChatWindow(Client client) {
+	public ChatWindow(Client client, LocalDB localDB) {
 		this.client		= client;
+		this.localDB	= localDB;
 
 		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 		setBounds(100, 100, 600, 800);
 		setTitle("Envoy");
 		setLocationRelativeTo(null);
 
+		// Save chats when window closes
+		addWindowListener(new WindowAdapter() {
+
+			@Override
+			public void windowClosing(WindowEvent e) { localDB.saveToLocalDB(); }
+		});
+
 		contentPane.setBackground(new Color(0, 0, 0));
 		contentPane.setForeground(Color.white);
 		contentPane.setBorder(new EmptyBorder(0, 5, 0, 0));
@@ -191,7 +200,7 @@ public class ChatWindow extends JFrame {
 				final User			user				= selectedUserList.getSelectedValue();
 				client.setRecipient(user);
 
-				currentChat = partnerChatList.stream().filter(chat -> chat.getRecipient().getID() == user.getID()).findFirst().get();
+				currentChat = localDB.getChats().stream().filter(chat -> chat.getRecipient().getID() == user.getID()).findFirst().get();
 
 				client.setRecipient(user);
 
@@ -232,7 +241,13 @@ public class ChatWindow extends JFrame {
 		new Thread(() -> {
 			Users					users			= client.getUsersListXml();
 			DefaultListModel<User>	userListModel	= new DefaultListModel<>();
-			users.getUser().forEach(user -> { userListModel.addElement(user); partnerChatList.add(new Chat(user)); });
+			users.getUser().forEach(user -> {
+				userListModel.addElement(user);
+
+				// Check if user exists in local DB
+				if (localDB.getChats().stream().filter(c -> c.getRecipient().getID() == user.getID()).count() == 0)
+					localDB.getChats().add(new Chat(user));
+			});
 			SwingUtilities.invokeLater(() -> userList.setModel(userListModel));
 		}).start();
 	}
@@ -247,9 +262,9 @@ public class ChatWindow extends JFrame {
 		new Timer(timeout, (evt) -> {
 			Messages unreadMessages = client.getUnreadMessages(client.getSender().getID());
 			for (int i = 0; i < unreadMessages.getMessage().size(); i++)
-				for (int j = 0; j < partnerChatList.size(); j++)
-					if (partnerChatList.get(j).getRecipient().getID() == unreadMessages.getMessage().get(i).getMetaData().getSender())
-						partnerChatList.get(j).appendMessage(unreadMessages.getMessage().get(i));
+				for (int j = 0; j < localDB.getChats().size(); j++)
+					if (localDB.getChats().get(j).getRecipient().getID() == unreadMessages.getMessage().get(i).getMetaData().getSender())
+						localDB.getChats().get(j).appendMessage(unreadMessages.getMessage().get(i));
 		}).start();
 	}
 }

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

@@ -8,6 +8,8 @@ import javax.swing.JOptionPane;
 
 import envoy.client.Client;
 import envoy.client.Config;
+import envoy.client.LocalDB;
+import envoy.exception.EnvoyException;
 
 /**
  * Starts the Envoy client and prompts the user to enter their name.
@@ -30,7 +32,7 @@ public class Startup {
 			ClassLoader loader = Thread.currentThread().getContextClassLoader();
 			try {
 				Properties configProperties = new Properties();
-				configProperties.load(loader.getResourceAsStream("server.properties"));
+				configProperties.load(loader.getResourceAsStream("client.properties"));
 				config.load(configProperties);
 			} catch (IOException e) {
 				e.printStackTrace();
@@ -48,10 +50,20 @@ public class Startup {
 			System.exit(1);
 		}
 		Client	client	= new Client(config, userName);
+		LocalDB	localDB	= new LocalDB(client.getSender());
+		try {
+			localDB.initializeDBFile(config.getLocalDB());
+		} catch (EnvoyException e) {
+			e.printStackTrace();
+			JOptionPane.showMessageDialog(null,
+					"Error while loading local database: " + e.toString() + "\nChats will not be stored locally.",
+					"Local DB error",
+					JOptionPane.WARNING_MESSAGE);
+		}
 
 		EventQueue.invokeLater(() -> {
 			try {
-				ChatWindow frame = new ChatWindow(client);
+				ChatWindow frame = new ChatWindow(client, localDB);
 				frame.setVisible(true);
 			} catch (Exception e) {
 				e.printStackTrace();

src/main/resources/client.properties

@@ -0,0 +1,3 @@
+server=http://kske.feste-ip.net
+port=43315
+localDB=.\\localDB

src/main/resources/server.properties

@@ -1,2 +0,0 @@
-server=http://kske.feste-ip.net
-port=43315