001/**
002 *   GRANITE DATA SERVICES
003 *   Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 *   This file is part of the Granite Data Services Platform.
006 *
007 *   Granite Data Services is free software; you can redistribute it and/or
008 *   modify it under the terms of the GNU Lesser General Public
009 *   License as published by the Free Software Foundation; either
010 *   version 2.1 of the License, or (at your option) any later version.
011 *
012 *   Granite Data Services is distributed in the hope that it will be useful,
013 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
014 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 *   General Public License for more details.
016 *
017 *   You should have received a copy of the GNU Lesser General Public
018 *   License along with this library; if not, write to the Free Software
019 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 *   USA, or see <http://www.gnu.org/licenses/>.
021 */
022package org.granite.cdi;
023
024import javax.enterprise.context.ApplicationScoped;
025import javax.enterprise.inject.Default;
026import javax.enterprise.inject.Instance;
027import javax.enterprise.inject.Produces;
028import javax.enterprise.util.AnnotationLiteral;
029import javax.inject.Inject;
030import javax.servlet.ServletContext;
031import javax.servlet.ServletContextEvent;
032import javax.servlet.ServletContextListener;
033import javax.servlet.annotation.WebListener;
034
035import org.granite.context.GraniteContext;
036import org.granite.gravity.Gravity;
037import org.granite.gravity.GravityManager;
038import org.granite.gravity.GravityProxy;
039import org.granite.messaging.webapp.ServletGraniteContext;
040
041
042/**
043 * TideGravity produces the Gravity instance for injection in CDI beans
044 * 
045 * @author William DRAI
046 */
047@ApplicationScoped
048public class GravityFactory {
049
050    private Gravity gravity;
051
052    private GravityProxy gravityProxy = new CDIGravityProxy();
053
054        @Inject
055        Instance<ServletContext> servletContextInstance;
056
057    @SuppressWarnings("serial")
058    private static final AnnotationLiteral<Default> DEFAULT_LITERAL = new AnnotationLiteral<Default>() {};
059
060    public void setGravity(Gravity gravity) {
061        this.gravity = gravity;
062    }
063    
064    @Produces
065    public Gravity getGravity() {
066        return gravityProxy;
067    }
068
069    private class CDIGravityProxy extends GravityProxy {
070
071        @Override
072        protected Gravity getGravity() {
073            if (gravity != null)
074                return gravity;
075
076            ServletContext servletContext = null;
077
078            if (!servletContextInstance.isUnsatisfied()) {
079                // Use ServletContext exposed with @Default qualifier (by Apache DeltaSpike Servlet for example)
080                servletContext = servletContextInstance.select(DEFAULT_LITERAL).get();
081            }
082            if (servletContext == null) {
083                // If not found, lookup in GraniteContext
084                GraniteContext graniteContext = GraniteContext.getCurrentInstance();
085                if (graniteContext != null && graniteContext instanceof ServletGraniteContext)
086                    servletContext = ((ServletGraniteContext)graniteContext).getServletContext();
087            }
088
089            return servletContext != null ? GravityManager.getGravity(servletContext) : null;
090        }
091
092    }
093}