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package com.vaadin.tests.minitutorials.v70;
import com.vaadin.navigator.Navigator;
import com.vaadin.navigator.ViewChangeListener;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.UI;
public class SimpleLoginUI extends UI {
@Override
protected void init(VaadinRequest request) {
/*
* Create a new instance of the navigator. The navigator will attach
* itself automatically to this view.
*/
new Navigator(this, this);
/*
* The initial log view where the user can login to the application
*/
getNavigator().addView(SimpleLoginView.NAME, SimpleLoginView.class);
/*
* Add the main view of the application
*/
getNavigator().addView(SimpleLoginMainView.NAME,
SimpleLoginMainView.class);
/*
* We use a view change handler to ensure the user is always redirected
* to the login view if the user is not logged in.
*/
getNavigator().addViewChangeListener(new ViewChangeListener() {
@Override
public boolean beforeViewChange(ViewChangeEvent event) {
// Check if a user has logged in
boolean isLoggedIn = getSession().getAttribute("user") != null;
boolean isLoginView = event
.getNewView() instanceof SimpleLoginView;
if (!isLoggedIn && !isLoginView) {
// Redirect to login view always if a user has not yet
// logged in
getNavigator().navigateTo(SimpleLoginView.NAME);
return false;
} else if (isLoggedIn && isLoginView) {
// If someone tries to access to login view while logged in,
// then cancel
return false;
}
return true;
}
});
}
}
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