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 */
022 package org.granite.cdi;
023
024 import javax.enterprise.context.ApplicationScoped;
025 import javax.enterprise.inject.Default;
026 import javax.enterprise.inject.Instance;
027 import javax.enterprise.inject.Produces;
028 import javax.enterprise.util.AnnotationLiteral;
029 import javax.inject.Inject;
030 import javax.servlet.ServletContext;
031
032 import org.granite.context.GraniteContext;
033 import org.granite.gravity.Gravity;
034 import org.granite.gravity.GravityManager;
035 import org.granite.gravity.GravityProxy;
036 import org.granite.messaging.webapp.ServletGraniteContext;
037
038
039 /**
040 * TideGravity produces the Gravity instance for injection in CDI beans
041 *
042 * @author William DRAI
043 */
044 @ApplicationScoped
045 public class GravityFactory {
046
047 private Gravity gravity;
048
049 private GravityProxy gravityProxy = new CDIGravityProxy();
050
051 @Inject
052 Instance<ServletContext> servletContextInstance;
053
054 @SuppressWarnings("serial")
055 private static final AnnotationLiteral<Default> DEFAULT_LITERAL = new AnnotationLiteral<Default>() {};
056
057 public void setGravity(Gravity gravity) {
058 this.gravity = gravity;
059 }
060
061 @Produces
062 public Gravity getGravity() {
063 return gravityProxy;
064 }
065
066 private class CDIGravityProxy extends GravityProxy {
067
068 @Override
069 protected Gravity getGravity() {
070 if (gravity != null)
071 return gravity;
072
073 ServletContext servletContext = null;
074
075 if (!servletContextInstance.isUnsatisfied()) {
076 // Use ServletContext exposed with @Default qualifier (by Apache DeltaSpike Servlet for example)
077 servletContext = servletContextInstance.select(DEFAULT_LITERAL).get();
078 }
079 if (servletContext == null) {
080 // If not found, lookup in GraniteContext
081 GraniteContext graniteContext = GraniteContext.getCurrentInstance();
082 if (graniteContext != null && graniteContext instanceof ServletGraniteContext)
083 servletContext = ((ServletGraniteContext)graniteContext).getServletContext();
084 }
085
086 return servletContext != null ? GravityManager.getGravity(servletContext) : null;
087 }
088
089 }
090 }