/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,

  * either express or implied. See the License for the specific language

  * governing permissions and limitations under the License.

  */

 package javax.faces.webapp;

 import java.io.IOException;

 import java.util.Map;

 import javax.faces.FacesException;

 import javax.faces.FactoryFinder;

 import javax.faces.context.ExternalContext;

 import javax.faces.context.FacesContext;

 import javax.faces.context.FacesContextFactory;

 import javax.faces.event.PhaseId;

 import javax.faces.internal.PhaseUtil;

 import javax.faces.internal.WebAppUtil;

 import javax.faces.internal.WindowIdUtil;

 import javax.faces.internal.scope.PageScope;

 import javax.faces.lifecycle.Lifecycle;

 import javax.faces.lifecycle.LifecycleFactory;

 import javax.servlet.Servlet;

 import javax.servlet.ServletConfig;

 import javax.servlet.ServletContext;

 import javax.servlet.ServletException;

 import javax.servlet.ServletRequest;

 import javax.servlet.ServletResponse;

 import javax.servlet.http.HttpServletResponse;

 /**

  * @author shot

  */

 public final class FacesServlet implements Servlet {

     public static final String CONFIG_FILES_ATTR = "javax.faces.CONFIG_FILES";

     public static final String LIFECYCLE_ID_ATTR = "javax.faces.LIFECYCLE_ID";

     private ServletConfig config = null;

     private FacesContextFactory facesContextFactory = null;

     private Lifecycle lifecycle = null;

     public void destroy() {

         config = null;

         facesContextFactory = null;

         lifecycle = null;

     }

     public ServletConfig getServletConfig() {

         return config;

     }

     public String getServletInfo() {

         return "Teeda - A JSF implementation with DI x AOP by Seasar Foundation -";

     }

     public void init(ServletConfig config) throws ServletException {

         this.config = config;

         facesContextFactory = (FacesContextFactory) WebAppUtil

                 .getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);

         LifecycleFactory lifecycleFactory = (LifecycleFactory) WebAppUtil

                 .getFactory(FactoryFinder.LIFECYCLE_FACTORY);

         String lifecycleId = WebAppUtil.getLifecycleId(config);

         lifecycle = lifecycleFactory.getLifecycle(lifecycleId);

     }

     public void service(ServletRequest request, ServletResponse response)

             throws ServletException, IOException {

         PhaseUtil.setCurrentPhase(PhaseId.ANY_PHASE);

         final ServletContext servletContext = config.getServletContext();

         final FacesContext context = facesContextFactory.getFacesContext(

                 servletContext, request, response, lifecycle);

         final ExternalContext externalContext = context.getExternalContext();

         final String pathInfo = externalContext.getRequestPathInfo();

         if (pathInfo != null &&

                 (pathInfo.startsWith("/WEB-INF") || pathInfo

                         .startsWith("/META-INF"))) {

             final HttpServletResponse hres = (HttpServletResponse) response;

             hres.sendError(HttpServletResponse.SC_NOT_FOUND);

             return;

         }

         try {

             WindowIdUtil.setupWindowId(externalContext);

             final Map pageScope = PageScope.getOrCreateContext(context);

             synchronized (pageScope) {

                 lifecycle.execute(context);

                 lifecycle.render(context);

             }

         } catch (FacesException e) {

             Throwable t = e.getCause();

             if (t == null) {

                 throw new ServletException(e.getMessage(), e);

             } else {

                 if (t instanceof ServletException) {

                     throw ((ServletException) t);

                 } else if (t instanceof IOException) {

                     throw ((IOException) t);

                 } else {

                     throw new ServletException(t.getMessage(), t);

                 }

             }

         } finally {

             context.release();

             PhaseUtil.clearPhase();

         }

     }

 }