org.lunifera.ecview.servlet.mobile.impl.MobileUI.java Source code

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Here is the source code for org.lunifera.ecview.servlet.mobile.impl.MobileUI.java

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/**
 * Copyright (c) 2011 - 2015, Lunifera GmbH (Gross Enzersdorf), Loetz KG (Heidelberg)
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *         Florian Pirchner - Initial implementation
 */
package org.lunifera.ecview.servlet.mobile.impl;

import org.lunifera.ecview.servlet.mobile.IMobileUiParticipant;
import org.lunifera.ecview.servlet.mobile.IMobileUiParticipantHandle;
import org.lunifera.runtime.web.vaadin.databinding.VaadinObservables;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Filter;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.util.tracker.ServiceTracker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.vaadin.annotations.PreserveOnRefresh;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.Title;
import com.vaadin.annotations.Widgetset;
import com.vaadin.server.Page.UriFragmentChangedEvent;
import com.vaadin.server.Page.UriFragmentChangedListener;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.UI;
import com.vaadin.ui.themes.Reindeer;

@SuppressWarnings("serial")
@Theme("mobiletheme")
@Widgetset("org.lunifera.mobile.vaadin.widgetset.LuniferaMobileWidget")
@PreserveOnRefresh
@Title("Vaadin Mobile Preview")
public class MobileUI extends UI implements UriFragmentChangedListener {

    private static final Logger LOGGER = LoggerFactory.getLogger(MobileUI.class);

    private CssLayout layout;

    private IMobileUiParticipantHandle uiHandle;

    private ServiceTracker<IMobileUiParticipant, IMobileUiParticipant> tracker;

    @Override
    protected void init(VaadinRequest request) {
        setTheme("mobiletheme");

        setStyleName(Reindeer.LAYOUT_BLUE);
        VaadinObservables.getRealm(getUI());

        layout = new CssLayout();
        layout.setSizeFull();
        setContent(layout);

        // initialize the UI
        getPage().addUriFragmentChangedListener(this);

        // notify about the current uri fragment
        renewHandle(getPage().getUriFragment());
        notifyHandle(getPage().getUriFragment());

        setTheme("mobiletheme");
    }

    /**
     * Notifies the uiHandle about the new fragment.
     * 
     * @param fragment
     */
    private void notifyHandle(String fragment) {
        if (uiHandle != null) {
            uiHandle.handle(layout, fragment);
        }
    }

    @Override
    public void uriFragmentChanged(UriFragmentChangedEvent event) {
        layout.removeAllComponents();
        renewHandle(event.getUriFragment());
        notifyHandle(event.getUriFragment());
    }

    /**
     * Creates a new handle for the new uriFragment.
     */
    private void renewHandle(String fragment) {
        if (uiHandle != null) {
            try {
                uiHandle.dispose();
            } finally {
                uiHandle = null;
            }
        }

        IMobileUiParticipant participant = findParticipant(this, fragment);
        try {
        } finally {
            if (participant != null) {
                uiHandle = participant.createHandle(this, fragment);
            } else {
                participant = findParticipant(this, "org.lunifera.ui.mobile.ErrorView");
                if (participant != null) {
                    uiHandle = participant.createHandle(this, fragment);
                }
            }
            // close the tracker AFTER creating the handle
            if (tracker != null) {
                tracker.close();
                tracker = null;
            }
        }
    }

    /**
     * Tries to find a mobile praticipant that provides proper handles.
     * 
     * @param ui
     * @param fragment
     * @return
     */
    public IMobileUiParticipant findParticipant(UI ui, String fragment) {
        if (fragment == null) {
            return null;
        }
        try {
            tracker = new ServiceTracker<IMobileUiParticipant, IMobileUiParticipant>(getContext(),
                    createFilter(ui, fragment), null);
            tracker.open();
            return tracker.getService();
        } catch (InvalidSyntaxException e) {
            LOGGER.error("{}", e);
        }

        return null;
    }

    private BundleContext getContext() {
        return Activator.getContext();
    }

    /**
     * Create a filter to find the proper uiHandle.
     * 
     * @param ui
     * @param fragment
     * @return
     * @throws InvalidSyntaxException
     */
    protected Filter createFilter(UI ui, String fragment) throws InvalidSyntaxException {
        return getContext().createFilter(String.format(
                "(&(objectClass=org.lunifera.ecview.servlet.mobile.IMobileUiParticipant)(uriFragment=%s))",
                fragment));
    }

    @Override
    public void detach() {
        super.detach();

        if (uiHandle != null) {
            uiHandle.dispose();
            uiHandle = null;
        }
    }
}