VaadinWebApplicationRegister.java

/*******************************************************************************
 * Copyright (c) 2012 by committers of lunifera.org
 *
 * 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.lunifera namespace
 *    
 *******************************************************************************/
package org.semanticsoft.vaaclipse.app.webapp;

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

import javax.servlet.Filter;

import org.eclipse.equinox.http.servlet.ExtendedHttpService;
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 org.semanticsoft.vaaclipse.app.Activator;
import org.semanticsoft.vaaclipse.app.common.Constants;
import org.semanticsoft.vaaclipse.app.servlet.VaadinOSGiServlet;
import org.semanticsoft.vaaclipse.app.servlet.WebResourcesHttpContext;

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 {

	private final ExtendedHttpService http;

	private VaadinServlet servlet;

	private Filter filter;

	private final String RESOURCE_BASE = "/VAADIN";
	private VaadinWebApplication webApplication;

	private String currentAlias;

	public VaadinWebApplicationRegister(ExtendedHttpService http,
			VaadinWebApplication webApplication) {
		super();
		this.http = http;
		this.webApplication = webApplication;
	}

	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;
		}
	}

	@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);
		}
	}

}