edu.nps.moves.mmowgli.Mmowgli2UIProvider.java Source code

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Here is the source code for edu.nps.moves.mmowgli.Mmowgli2UIProvider.java

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/*
  Copyright (C) 2010-2014 Modeling Virtual Environments and Simulation
  (MOVES) Institute at the Naval Postgraduate School (NPS)
  http://www.MovesInstitute.org and http://www.nps.edu
     
  This file is part of Mmowgli.
      
  Mmowgli is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  any later version.
    
  Mmowgli is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
    
  You should have received a copy of the GNU General Public License
  along with Mmowgli in the form of a file named COPYING.  If not,
  see <http://www.gnu.org/licenses/>
 */

package edu.nps.moves.mmowgli;

import java.util.Collection;

import com.vaadin.server.*;
import com.vaadin.ui.UI;

import edu.nps.moves.mmowgli.CACManager.CACData;

/**
 * Mmowgli2UIProvider.java Created on Apr 28, 2014
 * 
 * MOVES Institute Naval Postgraduate School, Monterey, CA, USA www.nps.edu
 * 
 * @author Mike Bailey, jmbailey@nps.edu
 * @version $Id$
 */
public class Mmowgli2UIProvider extends DefaultUIProvider {
    private static final long serialVersionUID = -3986937743749539633L;

    @Override
    public Class<? extends UI> getUIClass(UIClassSelectionEvent event) {
        VaadinService serv = event.getService();
        VaadinSession vsess;

        CACData data = (CACData) event.getRequest().getAttribute(CACData.class.getName()); // put in place by Mmowgli2VaadinServlet.sessionInit()
        if (data != null) // why null sometimes?
            if (!CACManager.canProceed(data)) {
                return Mmowgli2CACError.class;
            }

        try {
            vsess = serv.findVaadinSession(event.getRequest());
        } catch (SessionExpiredException ex) {
            return Mmowgli2UILogin.class;
        } catch (ServiceException sex) {
            return Mmowgli2UIError.class;
        }

        Collection<UI> uis = vsess.getUIs();

        int count = uis.size();

        if (count == 0)
            return Mmowgli2UILogin.class;

        MmowgliSessionGlobals globs = vsess.getAttribute(MmowgliSessionGlobals.class);

        // if globs != null, just means servlet has been hit, shouldn't be here
        // if globs ! initted, means Mmowgli2UILogin has not finished init ... send error
        // if glob ! loggedIn, means Mmowgli2UILogin in the sequence of login screens ... send error
        // else, send Subsequent UI, which is UI for 2nd and further browser windows/tabs in same user session

        if (globs != null && globs.initted & globs.isLoggedIn()) {
            for (UI ui : uis) {
                if (ui instanceof Mmowgli2UILogin) {
                    // so we've got an initted UI, and the user is logged in
                    return Mmowgli2UISubsequent.class;
                }
            }
        }
        return Mmowgli2UIError.class; // puts up "incomplete login" verbage
    }
}