CommandSourceApplet.java

/*
 * Created on Mar 9, 2004
 */
package org.nees.rbnb;

import java.applet.Applet;
import java.awt.*;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import com.rbnb.sapi.*;

public class CommandSourceApplet extends Applet {

    private static final String SERVER_NAME = "localhost";
    private static final String SERVER_PORT = "3333";
    private static final String SOURCE_NAME = "Command";
    private static final String CHANNEL_NAME = "CommandData";
    
    private String serverName = SERVER_NAME;
    private String serverPort = SERVER_PORT;
    private String server = serverName + ":" + serverPort;
    private String sourceName = SOURCE_NAME;
    private String channelName = CHANNEL_NAME;

    private Command[] commandArray = new Command[0];
    private Source source = null;
    private ChannelMap sMap;
    private int index;
    private boolean connected = false;

    private void setArgs() {
        String serverName = SERVER_NAME;
        String serverPort = SERVER_PORT;
        String sourceName = SOURCE_NAME;
        String channelName = CHANNEL_NAME;
        String param;

        param = getParameter("serverName");
        if (param != null)
            serverName = param;
        
        param = getParameter("serverPort");
        if (param != null)
            serverPort = param;
        
        param = getParameter("sourceName");
        if (param != null)
            sourceName = param;

        param = getParameter("channelName");
        if (param != null)
            channelName = param;

        setArgs(serverName + ":" + serverPort,sourceName,channelName);      
        
        commandArray = new Command[0];
        param = getParameter("numberOfCommands");
        if (param != null)
        {
            try
            {
                int n = Integer.parseInt(param);
                commandArray = new Command[n];      
            } catch (Exception ignore){}
        }

        for (int i = 0; i < commandArray.length; i++)
        {
            String paramCount = (i<9)?"0"+i:""+i;
            String nameParam = getParameter("commandName"+paramCount);
            String textParam = getParameter("commandText"+paramCount);
            String labelParam = getParameter("commandLabel"+paramCount);
            String valueParam = getParameter("commandDefault"+paramCount);

            if ((nameParam != null) && (textParam != null))
                commandArray[i] = new Command(nameParam, textParam, labelParam, valueParam);
            else
                commandArray[i] = new Command("empty","", null, null);
        }
    }
    
    private void setArgs(String server_host, String source_name, String channel_name)
    {
        server = server_host;
        serverText.setText(server);
        
        sourceName = source_name;
        sourceText.setText(sourceName);
        
        channelName = channel_name;
        channelText.setText(channelName);   
    }

    private void setArgsFromTextFields()
    {
        setArgs (   
            serverText.getText(),
            sourceText.getText(),
            channelText.getText()
            );
    }
    
    private void openConnection()
    {
        if (connected) return;
        
        try {
            disableStart();
            setArgsFromTextFields();
            messagePanel.message("Attempting connection to server...");
            source=new Source();
            source.OpenRBNBConnection(server,sourceName);
            sMap = new ChannelMap();
            int index = sMap.Add(channelName);
            connected = true;
            messagePanel.message("Connection made to server...");
            enableStart();
            start();
            connectButton.setLabel(DISCONNECT);
            connectButton.setActionCommand(connectButton.getLabel());
        } catch (SAPIException se)
        {
            messagePanel.message("SAPIException = " + se);
        }
    }
    
    private void enableStart() {
        startStopButton.setEnabled(true);
    }

    private void disableStart() {
        startStopButton.setEnabled(false);
    }

    private void closeConnection()
    {
        if (!connected) return;
        stop();
        disableStart();
        connected = false;
        source.CloseRBNBConnection();
        connectButton.setLabel(CONNECT);
        connectButton.setActionCommand(connectButton.getLabel());
    }
    public void init() {
        setArgs();
        setLayout();
        repaint();
        messagePanel.message("initializing... ");
        messagePanel.message("Number of commands = " + commandArray.length);
        for (int i = 0; i < commandArray.length; i++)
            messagePanel.message("Command(" + i + ") = " + commandArray[i]);
    }

    public void start() {
        messagePanel.message("starting... ");
        messagePanel.message("Command array length: " + commandArray.length);
        for (int i = 0; i < commandArray.length; i++)
            messagePanel.message("Command: " + commandArray[i]);
        startStopButton.setLabel(STOP);
        startStopButton.setActionCommand(startStopButton.getLabel());
    }

    public void stop() {
        messagePanel.message("stopping... ");
        startStopButton.setLabel(START);
        startStopButton.setActionCommand(startStopButton.getLabel());
    }

    public void destroy() {
        messagePanel.message("preparing for unloading...");
        closeConnection();
    }

    private static final String CONNECT = "Connect";
    private static final String DISCONNECT = "Disconnect";
    private Button connectButton = new Button(CONNECT);
    
    private static final String START = "Start";
    private static final String STOP = "Stop";
    private Button startStopButton = new Button(START);
    
    private TextField serverText = new TextField(SERVER_NAME + ":" + SERVER_PORT,40);
    private TextField sourceText = new TextField(SOURCE_NAME,40);
    private TextField channelText = new TextField(CHANNEL_NAME,40);

    MessagePanel messagePanel = new MessagePanel();

    private void setLayout()
    {
        setLayout(new BorderLayout());      
        
        Panel p = new Panel();
        p.setLayout(new GridLayout(3 + commandArray.length,2));
        p.add(serverText);
        p.add(new Label("Server Host : port"));
        p.add(sourceText);
        p.add(new Label("Source Name"));
        p.add(channelText);
        p.add(new Label("Channel Name"));
        for (int i = 0; i < commandArray.length; i++)
        {
            if (commandArray[i] != null)
            {
                p.add(new Button(commandArray[i].cover));
                Panel cp = new Panel();
                if (commandArray[i].label == null)
                {
                    cp.add(new Label("No value"));
                }
                else
                {
                    if (commandArray[i].value != null)
                        cp.add(new TextField(commandArray[i].value,40));
                    else
                        cp.add(new TextField("",40));
                    cp.add(new Label(commandArray[i].label));
                }
                p.add(cp);
            }
        }
        add("North",p);
            
        p = new Panel();
        p.add(connectButton);
        p.add(startStopButton);     
        add("South", p);
        
        p = new Panel();
        p.add(messagePanel);
        add("Center", p);
    
        startStopButton.setEnabled(false);
        startStopButton.setActionCommand(startStopButton.getLabel());
        startStopButton.addActionListener(
            new ActionListener() {
                public void actionPerformed(ActionEvent ev) {
                    startStopAction(ev.getActionCommand());
                }
            }
        );
        
        connectButton.setActionCommand(connectButton.getLabel());
        connectButton.addActionListener(
            new ActionListener() {
                public void actionPerformed(ActionEvent ev) {
                    connectAction(ev.getActionCommand());
                }
            }
        );
    
    }
    
    private void startStopAction(String command)
    {
        if (command.equals(STOP))
            stop();
        else
            start();
    }

    private void connectAction(String command)
    {
        if (command.equals(CONNECT))
            openConnection();
        else
            closeConnection();
    }

    private class Command
    {
        String cover = "Cover";
        String text = "Text";
        String label = null;
        String value = null;
        
        Command(String c, String t, String l, String v)
        {
            if (v != null)
            {
                value = v;
                label = "Value: ";
            } 

            if (l != null) label = l;
        
            if (c != null) cover = c;
            if (t != null) text = t;
        }

        public String toString()
        {
            if (value != null)
                return "Command: " + cover + ", "
                    + text + ", "
                    + label + ", "
                    + value;
            else if (label != null)
                return "Command: " + cover + ", "
                    + text + ", "
                    + label;
            return "Command: " + cover + ", "
                + text;
        }
    }

}

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