ClientForm.java

/*
 * Copyright © 2011 Nokia Corporation. All rights reserved.
 * Nokia and Nokia Connecting People are registered trademarks of Nokia Corporation. 
 * Oracle and Java are trademarks or registered trademarks of Oracle and/or its
 * affiliates. Other product and company names mentioned herein may be trademarks
 * or trade names of their respective owners. 
 * See LICENSE.TXT for license information.
 */
package com.nokia.example.btsppecho;

import java.util.Vector;
import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.LocalDevice;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;

import com.nokia.example.btsppecho.client.ClientConnectionHandler;
import com.nokia.example.btsppecho.client.ClientConnectionHandlerListener;

public class ClientForm
        extends Form
        implements CommandListener, ClientConnectionHandlerListener {

    private final MIDletApplication midlet;
    private final StringItem numConnectionsField;
    private final TextField sendDataField;
    private final StringItem receivedDataField;
    private final StringItem statusField;
    private final Command sendCommand;
    private final Command quitCommand;
    private final Command logCommand;
    private final Vector handlers = new Vector();
    private StringItem btAddressField = null;
    private volatile int numReceivedMessages = 0;
    private volatile int numSentMessages = 0;
    private int sendMessageId = 0;

    public ClientForm(MIDletApplication midlet) {
        super("Client");
        this.midlet = midlet;

        try {
            String address = LocalDevice.getLocalDevice().getBluetoothAddress();
            btAddressField = new StringItem("My address", address);
            append(btAddressField);
        } catch (BluetoothStateException e) {
            // nothing we can do, don't add field
        }

        numConnectionsField = new StringItem("Connections", "0");
        append(numConnectionsField);
        statusField = new StringItem("Status", "listening");
        append(statusField);
        sendDataField = new TextField("Send data",
                "Client says: 'Hello, world.'",
                64,
                TextField.ANY);
        append(sendDataField);
        receivedDataField = new StringItem("Last received data", null);
        append(receivedDataField);

        sendCommand = new Command("Send", Command.SCREEN, 1);
        quitCommand = new Command("Exit", Command.EXIT, 1);
        logCommand = new Command("View log", Command.SCREEN, 2);
        addCommand(quitCommand);
        addCommand(logCommand);
        setCommandListener(this);
    }

    void closeAll() {
        for (int i = 0; i < handlers.size(); i++) {
            ClientConnectionHandler handler =
                    (ClientConnectionHandler) handlers.elementAt(i);
            handler.close();
        }
    }

    public void commandAction(Command cmd, Displayable disp) {
        if (cmd == logCommand) {
            midlet.clientFormViewLog(this);
        }
        if (cmd == sendCommand) {
            String sendData = sendDataField.getString();
            try {
                sendMessageToAllClients(++sendMessageId, sendData);
            } catch (IllegalArgumentException e) {
                // Message length longer than
                // ServerConnectionHandler.MAX_MESSAGE_LENGTH

                String errorMessage =
                        "IllegalArgumentException while trying "
                        + "to send a message: " + e.getMessage();

                handleError(null, errorMessage);
            }
        } else if (cmd == quitCommand) {
            // the MIDlet aborts the ConnectionService, etc.
            midlet.clientFormExitRequest();
        }
    }

    public void removeHandler(ClientConnectionHandler handler) {
        // Note: we assume the caller has aborted/closed/etc.
        // the handler if that needed to be done. This method
        // simply removes it from the list of handlers maintained
        // by the ConnectionService.
        handlers.removeElement(handler);
    }

    public void sendMessageToAllClients(int sendMessageId, String sendData)
            throws IllegalArgumentException {
        Integer id = new Integer(sendMessageId);

        for (int i = 0; i < handlers.size(); i++) {
            ClientConnectionHandler handler =
                    (ClientConnectionHandler) handlers.elementAt(i);

            // throws IllegalArgumentException if message length
            // > ServerConnectionHandler.MAX_MESSAGE_LENGTH
            handler.queueMessageForSending(
                    id,
                    sendData.getBytes());
        }
    }

    // interface L2CAPConnectionListener
    public void handleAcceptAndOpen(ClientConnectionHandler handler) {
        handlers.addElement(handler);
        // start the reader and writer, it also causes underlying
        // InputStream and OutputStream to be opened.
        handler.start();

        statusField.setText("'Accept and open' for new connection");
    }

    public void handleStreamsOpen(ClientConnectionHandler handler) {

        // first connection
        if (handlers.size() == 1) {
            addCommand(sendCommand);
        }

        String str = Integer.toString(handlers.size());
        numConnectionsField.setText(str);
        statusField.setText("I/O streams opened on connection");
    }

    public void handleStreamsOpenError(ClientConnectionHandler handler,
            String errorMessage) {
        handlers.removeElement(handler);

        String str = Integer.toString(handlers.size());
        numConnectionsField.setText(str);
        statusField.setText("Error opening I/O streams: "
                + errorMessage);
    }

    public void handleReceivedMessage(ClientConnectionHandler handler,
            byte[] messageBytes) {
        numReceivedMessages++;

        String msg = new String(messageBytes);
        receivedDataField.setText(msg);

        statusField.setText(
                "# messages read: " + numReceivedMessages + " "
                + "sent: " + numSentMessages);
    }

    public void handleQueuedMessageWasSent(
            ClientConnectionHandler handler,
            Integer id) {
        numSentMessages++;

        statusField.setText("# messages read: "
                + numReceivedMessages + " "
                + "sent: " + numSentMessages);
    }

    public void handleClose(ClientConnectionHandler handler) {
        removeHandler(handler);
        if (handlers.size() == 0) {
            removeCommand(sendCommand);
        }

        String str = Integer.toString(handlers.size());
        numConnectionsField.setText(str);
        statusField.setText("Connection closed");
    }

    public void handleErrorClose(ClientConnectionHandler handler,
            String errorMessage) {
        removeHandler(handler);
        if (handlers.size() == 0) {
            removeCommand(sendCommand);
        }

        statusField.setText("Error: (close)\"" + errorMessage + "\"");
    }

    public void handleError(ClientConnectionHandler hander,
            String errorMessage) {
        statusField.setText("Error: \"" + errorMessage + "\"");
    }
}