[jboss-cvs] JBossAS SVN: r79526 - trunk/tomcat/src/main/org/jboss/web/jsf/integration/injection.

[jboss-cvs-commits at lists.jboss.org]

Author: emuckenhuber
Date: 2008-10-15 08:53:30 -0400 (Wed, 15 Oct 2008)
New Revision: 79526

Added:
   trunk/tomcat/src/main/org/jboss/web/jsf/integration/injection/JBossScanningInjectionProvider.java
Log:
[JBAS-6099] add not metadata based injection provider

Added: trunk/tomcat/src/main/org/jboss/web/jsf/integration/injection/JBossScanningInjectionProvider.java
===================================================================
--- trunk/tomcat/src/main/org/jboss/web/jsf/integration/injection/JBossScanningInjectionProvider.java	                        (rev 0)
+++ trunk/tomcat/src/main/org/jboss/web/jsf/integration/injection/JBossScanningInjectionProvider.java	2008-10-15 12:53:30 UTC (rev 79526)
@@ -0,0 +1,183 @@
+/*
+ * JBoss, Home of Professional Open Source.
+ * Copyright 2008, Red Hat Middleware LLC, and individual contributors
+ * as indicated by the @author tags. See the copyright.txt file in the
+ * distribution for a full listing of individual contributors.
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this software; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
+ */
+package org.jboss.web.jsf.integration.injection;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import javax.faces.context.FacesContext;
+import javax.servlet.ServletContext;
+
+import org.apache.InstanceManager;
+import org.jboss.logging.Logger;
+import org.jboss.web.tomcat.service.TomcatInjectionContainer;
+
+import com.sun.faces.spi.InjectionProvider;
+import com.sun.faces.spi.InjectionProviderException;
+
+/**
+ * A JSF injection provider.
+ * The dynamic processing of annotations and injections is handled by the
+ * <code>TomcatInjectionContainer</code>.
+ * 
+ * @author <a href="mailto:emuckenh at redhat.com">Emanuel Muckenhuber</a>
+ * @version $Revision$
+ */
+public class JBossScanningInjectionProvider implements InjectionProvider
+{
+
+   /** The injection container. */
+   protected TomcatInjectionContainer injectionContainer = null;
+
+   /** The logger. */
+   private static final Logger log = Logger.getLogger(InjectionProvider.class);
+
+   public JBossScanningInjectionProvider()
+   {
+      Object context = FacesContext.getCurrentInstance().getExternalContext().getContext();
+      // In case of a servletContext - could maybe also be a PortletContext !?
+      if (context != null && context instanceof ServletContext)
+      {
+         ServletContext servletContext = (ServletContext) (context);
+         this.injectionContainer = (TomcatInjectionContainer) servletContext
+                     .getAttribute(InstanceManager.class.getName());
+      }
+      if (injectionContainer == null)
+         log.debug("JSF injection not available for this web deployment.");
+   }
+   
+   protected JBossScanningInjectionProvider(TomcatInjectionContainer injectionContainer)
+   {
+      this.injectionContainer = injectionContainer;
+      
+      if(injectionContainer == null)
+         log.debug("JSF injection not available for this web deployment.");      
+   }
+
+   /**
+    * Invoke a postConstruct method annotated with @PostConstruct
+    * 
+    * @param managedBean the managed bean
+    * @throws InjectionProviderException
+    */
+   public void invokePostConstruct(Object managedBean) throws InjectionProviderException
+   {
+      try
+      {
+         Method postConstruct = getLifeCycleMethod(managedBean, PostConstruct.class);
+
+         if (postConstruct != null)
+         {
+            boolean accessibility = postConstruct.isAccessible();
+            postConstruct.setAccessible(true);
+            postConstruct.invoke(managedBean);
+            postConstruct.setAccessible(accessibility);
+         }
+      }
+      catch (Exception e)
+      {
+         throw new InjectionProviderException("PostConstruct failed on managed bean.", e);
+      }
+   }
+   
+   /**
+    * Invoke a preDestroy method annotated with @PreDestroy
+    * 
+    * @param managedBean the managed bean
+    * @throws InjectionProviderException
+    */
+   public void invokePreDestroy(Object managedBean) throws InjectionProviderException
+   {
+      try
+      {
+         Method preDestroy = getLifeCycleMethod(managedBean, PreDestroy.class);
+
+         if (preDestroy != null)
+         {
+            boolean accessibility = preDestroy.isAccessible();
+            preDestroy.setAccessible(true);
+            preDestroy.invoke(managedBean);
+            preDestroy.setAccessible(accessibility);
+         }
+      }
+      catch (Exception e)
+      {
+         throw new InjectionProviderException("PreDestroy failed on managed bean.", e);
+      }
+   }
+   
+   /**
+    * Process annotations and injection for a managedBean.
+    * This delegates the processing of annotations and injection
+    * to the <code>TomcatInjectionContainer</code>.
+    * 
+    * @param managedBean the managed bean
+    * @throws InjectionProviderException
+    */
+   public void inject(Object managedBean) throws InjectionProviderException
+   {
+      if(! checkInjectionContainer()) return;
+      try
+      {
+         // Process annotations
+         injectionContainer.processAnnotations(managedBean);
+         
+         // Process injectors
+         injectionContainer.processInjectors(managedBean);
+         
+      }
+      catch(Exception e)
+      {
+         throw new InjectionProviderException("Injection failed on managed bean.", e);
+      }
+   }
+
+   private Method getLifeCycleMethod(Object managedBean, Class<? extends Annotation> annotation)
+   {
+      Method[] methods = managedBean.getClass().getDeclaredMethods();
+      Method lifeCycleMethod = null;
+      for (int i = 0; i < methods.length; i++)
+      {
+         if (methods[i].isAnnotationPresent(annotation))
+         {
+            if ((lifeCycleMethod != null) || (methods[i].getParameterTypes().length != 0)
+                  || (Modifier.isStatic(methods[i].getModifiers())) || (methods[i].getExceptionTypes().length > 0)
+                  || (!methods[i].getReturnType().getName().equals("void")))
+            {
+               throw new IllegalArgumentException("Invalid PostConstruct method.");
+            }
+            lifeCycleMethod = methods[i];
+         }
+      }
+
+      return lifeCycleMethod;
+   }
+   
+   private boolean checkInjectionContainer()
+   {
+      return injectionContainer != null;
+   }
+
+}