GrafikChat/src/grafikchat/controller/ConnectController.java

package grafikchat.controller;

import grafikchat.model.ChatModel;
import grafikchat.ohmlogger.OhmLogger;
import grafikchat.view.ChatView;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.logging.Logger;
import javax.swing.JOptionPane;

/**
 * Handle events emitted from connect button
 * 
 * @author marian
 */
public class ConnectController implements ActionListener
{
    private ChatModel model;
    private ChatView view;
    private static Logger logger = OhmLogger.getLogger();
    
    /**
     * Constructor, initialize variables
     * @param model ChatModel
     * @param view ChatView
     */
    public ConnectController(ChatModel model, ChatView view)
    {
        this.model = model;
        this.view = view;
    }

    /**
     * Register events for connect button and radio button to select between server and client mode.
     */
    public void registerEvents()
    {
        this.view.getBtConnect().addActionListener(this);
        this.view.getRbClient().addActionListener(this);
        this.view.getRbServer().addActionListener(this);
    }
    
    /**
     * Event handler to take care of registered events
     * @param ae occurred event
     */
    @Override
    public void actionPerformed(ActionEvent ae)
    {
        Object object = ae.getSource();
        
        if (object == view.getBtConnect()) {
            int port = -1;

            try {
                port = Integer.parseInt(view.getTfPort().getText());
            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(view, "Port entspricht keiner Zahl!");
                logger.severe(e.toString());
                return;
            }

            if (view.getRbClient().isSelected() && (validIP(view.getTfIP().getText()) == false)) {
                JOptionPane.showMessageDialog(view, "Ungültige IP-Adresse!");
                logger.severe("IP-Adresse ungültig");
                return;
            }
            
            model.connectToPeer(view.getRbServer().isSelected(), view.getTfIP().getText(), port);
            
            view.getRbClient().setEnabled(false);
            view.getRbServer().setEnabled(false);
            view.getTfIP().setEnabled(false);
            view.getTfPort().setEnabled(false);
        } else {
            view.getTfIP().setEnabled(view.getRbClient().isSelected());
        }
    }
    
    /**
     * Primitive check if the ip is valid (only IPv4)
     * @param ip IP to check
     * @return true if valid, false otherwise
     */
    private boolean validIP (String ip) {
        try {
            if ( ip == null || ip.isEmpty() ) {
                return false;
            }

            String[] parts = ip.split( "\\." );
            if ( parts.length != 4 ) {
                return false;
            }

            for ( String s : parts ) {
                int i = Integer.parseInt( s );
                if ( (i < 0) || (i > 255) ) {
                    return false;
                }
            }
            if ( ip.endsWith(".") ) {
                return false;
            }

            return true;
        } catch (NumberFormatException e) {
            logger.severe(e.toString());
            return false;
        }
    }

}