org.eclipse.om2m.webapp.resourcesbrowser.xml/src/main/java/org/eclipse/om2m/webapp/resourcesbrowser/xml/Activator.java

/*******************************************************************************
 * Copyright (c) 2013-2020 LAAS-CNRS (www.laas.fr)
 * 7 Colonel Roche 31077 Toulouse - France
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * Initial Contributors:
 *     Thierry Monteil : Project manager, technical co-manager
 *     Mahdi Ben Alaya : Technical co-manager
 *     Samir Medjiah : Technical co-manager
 *     Khalil Drira : Strategy expert
 *     Guillaume Garzone : Developer
 *     François Aïssaoui : Developer
 *
 * New contributors :
 *******************************************************************************/
package org.eclipse.om2m.webapp.resourcesbrowser.xml;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.http.HttpService;
import org.osgi.util.tracker.ServiceTracker;
/**
 *  Manages the starting and stopping of the bundle.
 *  
 */
public class Activator implements BundleActivator {
	/** logger */
	private static Log LOGGER = LogFactory.getLog(Activator.class);
	public String globalContext = System.getProperty("org.eclipse.om2m.globalContext","");
	private Activator _this = this; //dgo
	public String uiContext = System.getProperty("org.eclipse.om2m.webInterfaceContext","/webpage");
	public String sep ="/";
	/** HTTP service tracker */
	private ServiceTracker<Object, Object> httpServiceTracker;
	
	@Override
	public void start(BundleContext context) throws Exception {
		if(uiContext.equals("/")){
			sep="";
		}
		
		httpServiceTracker = new ServiceTracker<Object, Object>(context, HttpService.class.getName(), null) {
	      public void removedService(ServiceReference<Object> reference, Object service) {
			LOGGER.info("HttpService removed");
	        try {
	        		LOGGER.info("Unregister "+uiContext+" http context");
	        		((HttpService) service).unregister(uiContext);
	        } catch (IllegalArgumentException e) {
		        LOGGER.error("Error unregistring webapp servlet",e);
	        }
	      }

	      public Object addingService(ServiceReference<Object> reference) {
			LOGGER.info("HttpService discovered");
	        HttpService httpService = (HttpService) context.getService(reference);
	        try{
			LOGGER.info("Register "+uiContext+" http context");
	          httpService.registerServlet(uiContext, new WelcomeServlet(_this), null, null);
			  httpService.registerResources(uiContext+sep+"welcome", "/webapps", null);
	        } catch (Exception e) {
	          LOGGER.error("Error registring webapp servlet",e);
	        }
	        return httpService;
	      }
	    };
	    httpServiceTracker.open();
	  }
	
	@Override
	public void stop(BundleContext context) throws Exception {
		if(httpServiceTracker != null){ //dgo
			((HttpService)httpServiceTracker.getService()).unregister(uiContext); //dgo
			httpServiceTracker.close(); //dgo
			httpServiceTracker = null; //dgo
		}
	}
}