org.eclipse.osbp.vaaclipse.addons.app/src/org/eclipse/osbp/vaaclipse/addons/app/webapp/VaadinWebApplicationRegister.java

/*******************************************************************************
 * Copyright (c) 2012, 2014 - Lunifera GmbH (Gross Enzersdorf, Austria), Loetz GmbH&Co.KG (69115 Heidelberg, Germany)
 *
 * 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
 * 
 * Information:
 * 		Based on original sources of 
 * 				- org.vaadin.osgi.Activator from Chris Brind
 *				- com.c4biz.osgiutils.vaadin.equinox.shiro.ApplicationRegister from Cristiano Gaviao
 *
 * Contributors:
 *    Florian Pirchner - migrated to vaadin 7 and copied into org.eclipse.osbp namespace
 *    
 *******************************************************************************/
package org.eclipse.osbp.vaaclipse.addons.app.webapp;

import java.util.Dictionary;
import java.util.Hashtable;

import javax.servlet.Filter;

import org.eclipse.equinox.http.servlet.ExtendedHttpService;
import org.eclipse.osbp.vaaclipse.addons.app.Activator;
import org.eclipse.osbp.vaaclipse.addons.app.common.Constants;
import org.eclipse.osbp.vaaclipse.addons.app.servlet.VaadinOSGiServlet;
import org.eclipse.osbp.vaaclipse.addons.app.servlet.WebResourcesHttpContext;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedService;
import org.osgi.service.component.ComponentFactory;
import org.osgi.service.http.HttpContext;

import com.vaadin.server.VaadinServlet;
import com.vaadin.server.VaadinSession;

/**
 * This class is responsible for registering the {@link ComponentFactory} as a
 * vaadin {@link VaadinSession}. It is a {@link ManagedService} so that it can
 * receive properties which are then passed in to the {@link VaadinOSGiServlet}
 * as init parameters, e.g. to enable production mode.
 */
@SuppressWarnings("deprecation")
public class VaadinWebApplicationRegister implements ManagedService {

	/** The http. */
	private final ExtendedHttpService http;

	/** The servlet. */
	private VaadinServlet servlet;

	/** The filter. */
	private Filter filter;

	/** The resource base. */
	private final String RESOURCE_BASE = "/VAADIN";
	
	/** The web application. */
	private VaadinWebApplication webApplication;

	/** The current alias. */
	private String currentAlias;

	/**
	 * Instantiates a new vaadin web application register.
	 *
	 * @param http
	 *            the http
	 * @param webApplication
	 *            the web application
	 */
	public VaadinWebApplicationRegister(ExtendedHttpService http,
			VaadinWebApplication webApplication) {
		super();
		this.http = http;
		this.webApplication = webApplication;
	}

	/**
	 * Kill.
	 */
	public void kill() {
		if (filter != null) {
			http.unregisterFilter(filter);
			filter = null;
		}
		if (currentAlias != null) {
			try {
				http.unregister(currentAlias);
				http.unregister(RESOURCE_BASE);
			} catch (java.lang.IllegalArgumentException e) {
				// ignore in case alias was not found exception
			}
		}
		if (servlet != null) {
			servlet.destroy();
			servlet = null;
		}
	}

	/* (non-Javadoc)
	 * @see org.osgi.service.cm.ManagedService#updated(java.util.Dictionary)
	 */
	@SuppressWarnings({ "unchecked", "rawtypes" })
	@Override
	public void updated(Dictionary properties) throws ConfigurationException {
		kill();

		try {
			if (properties == null) {
				properties = new Hashtable();
			}

			// update the webapplication
			//
			webApplication.updated(properties);

			// update the properties
			//
			properties.put(Constants.PROP_WIDGETSET,
					webApplication.getWidgetsetName());
			properties.put(Constants.PROP_PRODUCTION_MODE,
					Boolean.toString(webApplication.isProductionMode()));

			for (String propName : webApplication.getInitProperties()) {
				properties.put(propName,
						webApplication.getInitProperty(propName));
			}

			servlet = new VaadinOSGiServlet();
			HttpContext defaultContext = new WebResourcesHttpContext(Activator
					.getDefault().getBundle());
			// http.registerResources(RESOURCE_BASE, RESOURCE_BASE,
			// defaultContext);
			currentAlias = webApplication.getAlias();
			http.registerServlet(String.format("/%s", currentAlias), servlet,
					properties, defaultContext);

		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

}