//// Copyright 2002 Nokia Corporation.//// THIS SOURCE CODE IS PROVIDED 'AS IS', WITH NO WARRANTIES WHATSOEVER,// EXPRESS OR IMPLIED, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESS// FOR ANY PARTICULAR PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE// OR TRADE PRACTICE, RELATING TO THE SOURCE CODE OR ANY WARRANTY OTHERWISE// ARISING OUT OF ANY PROPOSAL, SPECIFICATION, OR SAMPLE AND WITH NO// OBLIGATION OF NOKIA TO PROVIDE THE LICENSEE WITH ANY MAINTENANCE OR// SUPPORT. FURTHERMORE, NOKIA MAKES NO WARRANTY THAT EXERCISE OF THE// RIGHTS GRANTED HEREUNDER DOES NOT INFRINGE OR MAY NOT CAUSE INFRINGEMENT// OF ANY PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OWNED OR CONTROLLED// BY THIRD PARTIES//// Furthermore, information provided in this source code is preliminary,// and may be changed substantially prior to final release. Nokia Corporation// retains the right to make changes to this source code at any time,// without notice. This source code is provided for informational// purposes only.//// Nokia and Nokia Connecting People are registered trademarks of Nokia// Corporation. Java and all Java-based marks are trademarks or registered// trademarks of Sun Microsystems, Inc. Other product and company names// mentioned herein may be trademarks or trade names of their respective owners.//// A non-exclusive, non-transferable, worldwide, limited license is hereby// granted to the Licensee to download, print, reproduce and modify the// source code. The licensee has the right to market, sell, distribute and// make available the source code in original or modified form only when// incorporated into the programs developed by the Licensee. No other// license, express or implied, by estoppel or otherwise, to any other// intellectual property rights is granted herein.//import javax.microedition.midlet.*;import javax.microedition.lcdui.*;public class ChatMIDlet     extends MIDlet     implements IncomingTextMessageListener,                OutgoingTextMessageListener,                CommandListener{    private final static PhoneBook phoneBook = PhoneBook.getPhoneBook();    private static SmsHandler smsHandler = null;    private String port = null;    private ChatScreen chatScreen = null;    private WriteMessageScreen writeMessageScreen = null;    private PeerList peerList = null;    private PeerScreen peerScreen = null;    private String phoneNumbers[];    private String prompt;    public ChatMIDlet()    {    }    public void startApp()    {        Displayable current = Display.getDisplay(this).getCurrent();        if (current == null)        {            if (setSmsHandler())            {                InputNameScreen inputNameScreen =                    new InputNameScreen(this);                Display.getDisplay(this).setCurrent(inputNameScreen);            }            else            {                Form quitScreen = new Form("Error");                quitScreen.append("Neither WMA nor " +                                  "Nokia SMS API is available!");                quitScreen.addCommand(new Command("Quit", Command.EXIT, 2));                quitScreen.setCommandListener(this);                Display.getDisplay(this).setCurrent(quitScreen);            }        }        else        {            Display.getDisplay(this).setCurrent(current);        }    }    private boolean setSmsHandler()    {        port = getAppProperty("Default-Port");        try        {            Class.forName("javax.wireless.messaging.Message");            smsHandler =                (SmsHandler) Class.forName("WmaSmsHandler").newInstance();        }        catch (Exception e)        {        }        if (smsHandler == null)        {            try            {                Class.forName("com.nokia.mid.messaging.Message");                smsHandler =                    (SmsHandler) Class.forName("NokiaSmsHandler").newInstance();            }            catch (Exception e)            {            }            String attr = getAppProperty("Nokia-SMS-Handler-1");            if (attr != null)            {                port = attr.substring(attr.indexOf(':') + 4,                    attr.indexOf(','));            }        }        return (smsHandler != null);    }    public void commandAction(Command c, Displayable d)    {        exitRequested();    }    // InputNameScreen Callbacks    void inputNameScreenDone(String chatName)    {        if (smsHandler != null)        {            ErrorScreen.init(null, Display.getDisplay(this));            smsHandler.init(this, this, port);            prompt = "<" + chatName + ": ";            chatScreen = new ChatScreen(this, prompt);            Display.getDisplay(this).setCurrent(chatScreen);        }        else        {            exitRequested();        }    }    void inputNameScreenQuit()    {        exitRequested();    }    // ChatScreen Callbacks    void chatScreenChoosePeer()    {        choosePeer();    }    void chatScreenWriteMessage()    {        writeMessage(null);    }    void chatScreenQuit()    {        exitRequested();    }    private void choosePeer()    {        String[] peerNames = phoneBook.getNames();        if (peerNames != null)        {            if (peerList == null)            {                peerList = new PeerList(this, peerNames);            }            else            {                peerList.init(peerNames);            }            Display.getDisplay(this).setCurrent(peerList);        }        else        {            updatePhoneBook(null);        }    }    private void updatePhoneBook(String name)    {        if (peerScreen == null)        {            peerScreen = new PeerScreen(this);        }        String phoneNumber = (name == null) ?                             null : phoneBook.getPhoneNumber(name);        peerScreen.init(name, phoneNumber);        Display.getDisplay(this).setCurrent(peerScreen);    }    private void writeMessage(String[] peerNames)    {        if (writeMessageScreen == null)        {            writeMessageScreen = new WriteMessageScreen(this);        }        if (peerNames == null)        {            peerNames = phoneBook.getNames(phoneNumbers);        }        writeMessageScreen.setTitle(peerNames);        Display.getDisplay(this).setCurrent(writeMessageScreen);    }    // PeerList screen Callbacks    void peerListBack()    {        Display.getDisplay(this).setCurrent(chatScreen);    }    void peerListEdit(String name)    {        updatePhoneBook(name);    }    void peerListDone(String[] peerNames)    {        if (peerNames != null)        {            phoneNumbers = new String[peerNames.length];            for (int i = phoneNumbers.length - 1; i >= 0; i--)            {                phoneNumbers[i] = phoneBook.getPhoneNumber(peerNames[i]);            }            chatScreen.enableWriteCommand();            writeMessage(peerNames);        }        else        {            Display.getDisplay(this).setCurrent(chatScreen);        }    }    void peerListNew()    {        updatePhoneBook(null);    }    void peerListRemove(String[] names)    {        phoneBook.removeEntries(names);    }    // PeerScreen callbacks    void peerScreenDone(String name, String phoneNumber)    {        phoneBook.update(name, phoneNumber);        choosePeer();    }    void peerScreenBack()    {        if (peerList != null && peerList.size() > 0)        {            Display.getDisplay(this).setCurrent(peerList);        }        else        {            Display.getDisplay(this).setCurrent(chatScreen);        }    }    // WriteMessageScreen callbacks    void writeMessageScreenDone(String content)    {        Display.getDisplay(this).setCurrent(chatScreen);        if (content != null)        {            String message = prompt + content;            chatScreen.update(message);            smsHandler.sendMessage(phoneNumbers, message);        }    }    void writeMessageScreenBack()    {        Display.getDisplay(this).setCurrent(chatScreen);    }    // IncomingTextMessageListener interface methods    public void handleIncomingMessage(String phoneNumber, String content)    {        String fromName = content.substring(1, content.indexOf(':'));        fromName = phoneBook.validate(fromName, phoneNumber);        chatScreen.update(">" + content.substring(1));        chatScreen.enableWriteCommand();        if (Display.getDisplay(this).getCurrent() != writeMessageScreen)        {            phoneNumbers = new String[1];            phoneNumbers[0] = phoneNumber;        }    }    public void handleIncomingError(String errorStr)    {        ErrorScreen.showError(errorStr);    }    // OutgoingTextMessageListener interface methods    public void handleOutgoingOk(OutgoingTextMessage message)    {    }    public void handleOutgoingCancel(OutgoingTextMessage message,        String type)    {        writeMessageScreen.setTitle(type);    }    public void handleOutgoingError(OutgoingTextMessage message,        String errorStr)    {        ErrorScreen.showError(errorStr);    }    // MIDlet methods    public void pauseApp()    {    }    public void destroyApp(boolean unconditional)    {    }    // A convienence method for exiting.    void exitRequested()    {        if (smsHandler != null)        {            smsHandler.abort();        }        destroyApp(true);        notifyDestroyed();    }}