EDIT

package eu.etaxonomy.cdm.vaadin.presenter;

import java.net.URI;

import org.springframework.security.authentication.AuthenticationManager;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;

import org.springframework.security.core.Authentication;

import com.vaadin.server.VaadinSession;

import eu.etaxonomy.cdm.vaadin.util.CdmSpringContextHelper;

import eu.etaxonomy.cdm.vaadin.util.CdmVaadinAuthentication;

import eu.etaxonomy.cdm.vaadin.util.CdmVaadinSessionUtilities;

import eu.etaxonomy.cdm.vaadin.view.IAuthenticationComponent;

public class AuthenticationPresenter implements IAuthenticationComponent.AuthenticationComponentListener{

    @Override

    public boolean login(URI uri, String context, String userName, String password) {

        UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(userName, password);

        AuthenticationManager authenticationManager = (AuthenticationManager) CdmSpringContextHelper.getCurrent().getBean("authenticationManager");

        Authentication authentication = authenticationManager.authenticate(token);

        if(authentication != null && authentication.isAuthenticated()) {

            CdmVaadinAuthentication cvAuthentication = (CdmVaadinAuthentication) VaadinSession.getCurrent().getAttribute(CdmVaadinAuthentication.KEY);

            if(cvAuthentication == null) {

                cvAuthentication = new CdmVaadinAuthentication();

            }

            cvAuthentication.addAuthentication(uri, context, authentication);

            CdmVaadinSessionUtilities.setCurrentAttribute(CdmVaadinAuthentication.KEY, cvAuthentication);

            return true;

        }

        return false;

    }

}