Setting up an UDIGApplication that requires a login is a common request. This example shows how to use the checkLogin() method to talk to a "Client" plug-in and call its login method.

The "Client' plug-in technique is used when you have a Client plugin that holds on to a Spring remoting Session with a J2EE server application.

checkLogin

Here is an example of overriding the UDIGApplication checkLogin() method.

public boolean checkLogin() {
        LoginDialog loginDialog = new LoginDialog(
                "Connecting Communities Login",
                "Please login to Connecting Communities:" );
        
        boolean login= false;
        while( !login ){
            int result = loginDialog.open();                    
            if( result == MessageDialog.OK){
                try {
                    login = Client.getDefault().login( loginDialog.getUser(), loginDialog.getPassword() );
                    if( !login ){
                        loginDialog.setMessage("Could not login - please try again");
                    }                    
                } catch (Exception connectionProblem) {
                    MessageDialog.openInformation(null, "Could not Connect", connectionProblem.toString() );
                    
                    return false; // probably should prompt user here?
                }
            }
            else {
                return false; // user cancelled
            }
        }
        return true;
    }

LoginDialog

The above example made use of a really simple MessageDialog shown bellow:

public class LoginDialog extends MessageDialog {
    String user;
    String password;
    public LoginDialog( String title, String dialogMessage) {
        super(null, title, null, dialogMessage, QUESTION,
                new String[]{"Login","Exit"}, 0 );            
    }

    protected Control createCustomArea(Composite parent) {
        Composite composite = new Composite(parent, SWT.NONE);
        composite.setLayout( new GridLayout(2,false) );
                    
        Label label = new Label( composite, SWT.RIGHT );
        label.setText("User:");
        GridData gridData = new GridData( SWT.FILL, SWT.FILL, false, false );
        gridData.widthHint = 100; // just a suggestion
        label.setLayoutData( gridData );
                    
        final Text userText = new Text( composite, SWT.SINGLE );
        userText.setLayoutData( new GridData( SWT.FILL, SWT.CENTER, true, false ));
        userText.addModifyListener( new ModifyListener(){
            public void modifyText( ModifyEvent e ) {
                user = userText.getText();
            }                
        });
        
        label = new Label( composite, SWT.RIGHT );
        label.setText("Password:");
        label.setLayoutData( gridData );
        
        final Text passwordText = new Text ( composite, SWT.SINGLE | SWT.PASSWORD );
        passwordText.setLayoutData( new GridData( SWT.FILL, SWT.CENTER, true, false ));
        passwordText.addModifyListener( new ModifyListener(){
            public void modifyText( ModifyEvent e ) {
                user = passwordText.getText();
            }                
        });
        return null;
    }
    
    public String getUser() {
        return user;
    }
    public String getPassword() {
        return password;
    }
    public void setMessage( String message ){
        messageLabel.setText( message );
    }
}