JSpinner - Increment or decrement button pressed?

Hi Folks,
I have a JSpinner component which can only be updated through the increment/decrement buttons.
To validate the value before updating the UI, I need to verify the next value. So how do I determine if the user clicked the increment or the decrement button?
Also, the sequence of valid values that the JSpinner can display is not linear but changes based on the previous value.
For eg, the valid values are 4, 5, 8, 12, 17.. to a max of 300

Thanks for that link Michael. It helped a bit.. However, I'm stuck in the checkChange method. My slightly modified code is as follows:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing
     JSpinner spinner;
     final int MIN = 0, MAX = 100;
     public void buildGUI()
          JPanel p = new JPanel();
          spinner = new JSpinner(new SpinnerNumberModel(MIN,MIN,MAX,1));
          spinner.setUI(new ChangeVerifierUI());
          JFrame f = new JFrame();
     class ChangeVerifierUI extends javax.swing.plaf.basic.BasicSpinnerUI
          protected Component createNextButton()
               JButton nextButton = (JButton)super.createNextButton();
               nextButton.addMouseListener(new MouseAdapter(){
                    public void mousePressed(MouseEvent me){
                         if(((Integer)spinner.getValue()).intValue() < MAX) checkChange(+1);
               return nextButton;
          protected Component createPreviousButton()
               JButton previousButton = (JButton)super.createPreviousButton();
               previousButton.addMouseListener(new MouseAdapter(){
                    public void mousePressed(MouseEvent me){
                         if(((Integer)spinner.getValue()).intValue() > MIN) checkChange(-1);
               return previousButton;
     public void checkChange(int direction)
//          int result = JOptionPane.showConfirmDialog(null,"Are you sure you want to row setting ?",
//                    "Setup", JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);
          System.out.println("Verification code comes here");
//Only to create delay for standalone testing
          for(int i=0; i<1000; i++) {
               for (int j=0; j<10000; j++) {
                    int ttemp = i*j;
//          if (result == JOptionPane.YES_OPTION) spinner.setValue(
//                    ((Integer)spinner.getValue()).intValue()+
//                    (((Number)((SpinnerNumberModel)spinner.getModel()).getStepSize()).intValue())*direction);
     public static void main(String[] args)
          SwingUtilities.invokeLater(new Runnable(){
               public void run(){
                    new Testing().buildGUI();
}I noticed that the sys-out prints only once and then the JSpinner value continues to increment. How would one modify that behavior to say print (or in the actual case, make a call on a library for verification of the value) for each increment before the value is set on the UI?
Thanks a lot for your help so far :)

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            try {
                KeyStore ks = KeyStore.getInstance("JKS");
                ks.load(new FileInputStream(ksName), ksPass);
                KeyManagerFactory kmf =
                kmf.init(ks, ctPass);
                SSLContext sc = SSLContext.getInstance("TLS");
                sc.init(kmf.getKeyManagers(), null, null);
                SSLServerSocketFactory ssf = sc.getServerSocketFactory();
                SSLServerSocket s = (SSLServerSocket) ssf.createServerSocket(8888);
                SSLSocket c = (SSLSocket) s.accept();
                InputStream is = c.getInputStream();
                ObjectInputStream ois = new ObjectInputStream(is);
                OutputStream os = c.getOutputStream();
                ObjectOutputStream oos = new ObjectOutputStream(os);
                boolean done = false;
                User u;
                    u = (User) ois.readObject();
                    String confirmString = "rcvdOK";
                    String errorString = "ERROR";
                    if (u != null) {
                        System.out.println(u.getFirstName() + " " + u.getLastName());
                    } else if (u == null) {
            } catch (Exception e) {
    }Thanks for any help, btw this doesnt need to be via ssl, the problem would be the same using only http. Please anyone help me:)
    Edited by: Vencicek on 7.5.2012 2:19
    Edited by: EJP on 7/05/2012 19:53
    Edited by: Vencicek on 7.5.2012 3:36

    Current code fails because it's sending still the same entity again(using while loop)No it's not. You are creating a new User object every time around the loop.
    which makes the system freezeWhich means that you are executing network code in the event thread. Don't do that, use a separate thread. At the moment you're doing all that sending inside the constructor for ClientFrame which is an even worse idea: you can never get out of there to the rest of your client program. This is a program design problem, not a networking problem.
    and doesn't allow me to set new parameters of the new entityI do not understand.
    I need to find a way to keep Server running even when the client doesn't send any data and wait until the client doesnt press the send button again to read a new object.That's exactly what happens. readObject() blocks until data is received.

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