E6 (a,b,c)

ChatClient.java

@@ -0,0 +1,210 @@
+// This file contains material supporting section 3.7 of the textbook:
+// "Object Oriented Software Engineering" and is issued under the open-source
+// license found at www.lloseng.com 
+
+package client;
+
+import ocsf.client.*;
+import common.*;
+import java.io.*;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * This class overrides some of the methods defined in the abstract
+ * superclass in order to give more functionality to the client.
+ *
+ * @author Dr Timothy C. Lethbridge
+ * @author Dr Robert Laganiè
+ * @author François Bélanger
+ * @version July 2000
+ */
+public class ChatClient extends AbstractClient
+{
+  //Instance variables **********************************************
+
+  /**
+   * The interface type variable.  It allows the implementation of 
+   * the display method in the client.
+   */
+  ChatIF clientUI; 
+
+
+  //Constructors ****************************************************
+
+  /**
+   * Constructs an instance of the chat client.
+   *
+   * @param host The server to connect to.
+   * @param port The port number to connect on.
+   * @param clientUI The interface type variable.
+   */
+
+  public ChatClient(String host, int port, ChatIF clientUI) 
+    throws IOException 
+  {
+    super(host, port); //Call the superclass constructor
+    this.clientUI = clientUI;
+    openConnection();
+  }
+
+
+  //Instance methods ************************************************
+
+  /**
+   * This method handles all data that comes in from the server.
+   *
+   * @param msg The message from the server.
+   */
+  public void handleMessageFromServer(Object msg) 
+  {
+    clientUI.display(msg.toString());
+  }
+
+  /**
+   * This method handles all data coming from the UI            
+   *
+   * @param message The message from the UI.    
+   */
+  public void handleMessageFromClientUI(String message)
+  {
+    try
+    {
+      sendToServer(message);
+    }
+    catch(IOException e)
+    {
+      clientUI.display
+        ("Could not send message to server.  Terminating client.");
+      quit();
+    }
+  }
+
+  /**
+   * This method terminates the client.
+   */
+  public void quit()
+  {
+    try
+    {
+      closeConnection();
+    }
+    catch(IOException e) {}
+    System.exit(0);
+  }
+
+    	/**
+	 * Hook method called after the connection has been closed. The default
+	 * implementation does nothing. The method may be overriden by subclasses to
+	 * perform special processing such as cleaning up and terminating, or
+	 * attempting to reconnect.
+	 */
+	protected void connectionClosed() {
+		System.out.println("SYSTEM ::: Connection to the Server Terminated");
+	}
+
+	/**
+	 * Hook method called each time an exception is thrown by the client's
+	 * thread that is waiting for messages from the server. The method may be
+	 * overridden by subclasses.
+	 * 
+	 * @param exception
+	 *            the exception raised.
+	 */
+	protected void connectionException(Exception exception) {
+		System.out.println("SYSTEM ::: Server Shutdown");
+		quit();
+	}
+
+  	/**
+	* This method contains all the client commands.
+	* Every commands begin with '#'.
+	* 
+	* @param command word that needs to be actioned.
+	*/
+	public void clientCommand(String message){
+
+		//Make the message received into an array (necessary for setHost/setPort)
+		String[] messageArray = message.split(" ");
+		String[] commandArray = new String[]{"#quit","#login","#logoff","#gethost","#sethost","#getport","#setport"};
+
+		//If the command isn't in the 'known' list, give error message and command list.
+		if (!Arrays.asList(commandArray).contains(messageArray[0])){
+			System.out.println("The command line you entered is 'INVALID', here is a list of all current commands.");
+			System.out.println("#quit // #login // #logoff // #gethost // #sethost // #getport // #setport");
+		}
+
+		switch(messageArray[0])	{
+			case "#quit":
+				quit();
+
+			case "#login":
+				//what happens in #login
+				if (isConnected()){
+					System.out.println("SYSTEM ::: The client is already connected");
+					return;
+				}
+				else {
+					try
+					{
+					openConnection();
+					System.out.println("SYSTEM ::: Client connected");
+					}
+					catch (IOException ex){System.out.println("SYSTEM ::: Failed to connect to Server");}
+					return;
+				}
+
+			case "#logoff":
+			    try
+				{
+					System.out.println("SYSTEM ::: Shutting down client");
+					closeConnection();
+					return;
+				}
+				catch(IOException e) {}
+				return;
+
+			case "#gethost":
+				System.out.println("SYSTEM ::: The Host name is: " + getHost());
+				return;
+
+			case "#sethost":
+
+				try 
+				{
+					setHost(messageArray[1]);
+					System.out.println("SYSTEM ::: The new Host has been set to: " + getHost());
+				} catch (Exception ex2) 
+				{
+					System.out.println("SYSTEM ::: Array Out of Bound: Please try again with the new Host name.");
+				} return;
+
+			case "#getport":
+
+				try
+				{
+					System.out.println("SYSTEM ::: The current Port is: " + getPort());
+				}
+
+				catch (Exception a)
+				{
+					System.out.println("SYSTEM ::: There was an error in the getPort attempt");
+				}
+				return;
+
+			case "#setport": 
+
+				try {
+					int newPort = Integer.parseInt(messageArray[1]);
+
+					setPort(newPort);
+					System.out.println("SYSTEM ::: The new Port has been set to: " + getPort());
+				} catch (Exception ex2) 
+				{
+					System.out.println("SYSTEM ::: Array Out-of-Bound or your Port was not a valid Integer between 1 and 65535.");
+				} return;
+		}
+	}
+
+}
+//End of ChatClient class

ClientConsole.java

@@ -0,0 +1,177 @@
+// This file contains material supporting section 3.7 of the textbook:
+// "Object Oriented Software Engineering" and is issued under the open-source
+// license found at www.lloseng.com 
+
+import java.io.*;
+import client.*;
+import common.*;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * This class constructs the UI for a chat client.  It implements the
+ * chat interface in order to activate the display() method.
+ * Warning: Some of the code here is cloned in ServerConsole 
+ *
+ * @author François Bélanger
+ * @author Dr Timothy C. Lethbridge  
+ * @author Dr Robert Laganière
+ * @version July 2000
+ */
+public class ClientConsole implements ChatIF 
+{
+  //Class variables *************************************************
+
+  /**
+   * The default port to connect on.
+   */
+  final public static int DEFAULT_PORT = 5555;
+
+  //Instance variables **********************************************
+
+  /**
+   * The instance of the client that created this ConsoleChat.
+   */
+  ChatClient client;
+
+
+  //Constructors ****************************************************
+
+  /**
+   * Constructs an instance of the ClientConsole UI.
+   *
+   * @param host The host to connect to.
+   * @param port The port to connect on.
+   */
+  public ClientConsole(String host, int port) 
+  {
+    try 
+    {
+      client= new ChatClient(host, port, this);
+    } 
+    catch(IOException exception) 
+    {
+      System.out.println("Error: Can't setup connection!"
+                + " Terminating client.");
+      System.exit(1);
+    }
+  }
+
+
+  //Instance methods ************************************************
+
+  /**
+   * This method waits for input from the console.  Once it is 
+   * received, it sends it to the client's message handler.
+   */
+  public void accept() 
+  {
+    try
+    {
+      BufferedReader fromConsole = 
+        new BufferedReader(new InputStreamReader(System.in));
+      String message;
+
+      while (true) 
+      {
+        message = fromConsole.readLine();
+
+
+		//This is where I decide what to do with the code.
+
+		if ( message.charAt(0) == '#' ){
+			client.clientCommand(message);}
+
+		else {client.handleMessageFromClientUI(message);}
+
+      }
+    } 
+    catch (Exception ex) 
+    {
+      System.out.println
+        ("Unexpected error while reading from console!");
+    }
+  }
+
+  /**
+   * This method overrides the method in the ChatIF interface.  It
+   * displays a message onto the screen.
+   *
+   * @param message The string to be displayed.
+   */
+  public void display(String message) 
+  {
+    System.out.println("> " + message);
+  }
+
+  	/**
+	 * Hook method called after the connection has been closed. The default
+	 * implementation does nothing. The method may be overriden by subclasses to
+	 * perform special processing such as cleaning up and terminating, or
+	 * attempting to reconnect.
+	 */
+	protected void connectionClosed() {
+		System.out.println("The server has shutdown.");
+	}
+
+	/**
+	 * Hook method called each time an exception is thrown by the client's
+	 * thread that is waiting for messages from the server. The method may be
+	 * overridden by subclasses.
+	 * 
+	 * @param exception
+	 *            the exception raised.
+	 */
+	protected void connectionException(Exception exception) {
+		connectionClosed();
+	}
+
+
+  //Class methods ***************************************************
+
+  /**
+   * This method is responsible for the creation of the Client UI.
+   *
+   * @param args[0] The host to connect to.
+   */
+  public static void main(String[] args) 
+  {
+    String host = "";
+    int port = 0;  //The port number
+
+    try
+    {
+      host = args[0];
+	  port = Integer.parseInt(args[1]);
+    }
+    catch(ArrayIndexOutOfBoundsException e)
+    {
+		port = DEFAULT_PORT;
+
+		try
+		{
+			host = args[0];
+		}
+		catch(ArrayIndexOutOfBoundsException f)
+		{
+			host = "localhost";
+		}
+    }
+
+	if (args.length == 0)
+	{
+		System.out.println("Host Name: " + host + " (default)");
+	}
+	else { System.out.println("Host Name: " + host);}
+
+	if (port == DEFAULT_PORT)
+	{
+		System.out.println("Port Number: " + port + " (default)");
+	}
+	else {System.out.println("Port Number: " + port);}
+
+    ClientConsole chat= new ClientConsole(host, port);
+    chat.accept();  //Wait for console data
+  }
+}
+//End of ConsoleChat class