package org.apache.maven.plugins.site.webapp;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   */
  
  import org.apache.maven.doxia.siterenderer.DocumentRenderer;
  import org.apache.maven.doxia.siterenderer.Renderer;
  import org.apache.maven.doxia.siterenderer.RendererException;
  import org.apache.maven.doxia.siterenderer.SiteRenderingContext;
  import org.apache.maven.plugins.site.ReportDocumentRenderer;
  
  import javax.servlet.Filter;
  import javax.servlet.FilterChain;
  import javax.servlet.FilterConfig;
  import javax.servlet.ServletContext;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServletRequest;
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  
  /**
   * Render a page as requested.
   *
   * @author <a href="mailto:brett@apache.org">Brett Porter</a>
   */
  public class DoxiaFilter
      implements Filter
  {
      public static final String SITE_RENDERER_KEY = "siteRenderer";
  
      public static final String I18N_DOXIA_CONTEXTS_KEY = "i18nDoxiaContexts";
  
      public static final String LOCALES_LIST_KEY = "localesList";
  
      private Renderer siteRenderer;
  
      private Map<String, DoxiaBean> i18nDoxiaContexts;
  
      private List<Locale> localesList;
  
      /**
       * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
       */
      public void init( FilterConfig filterConfig )
          throws ServletException
      {
          ServletContext servletContext = filterConfig.getServletContext();
  
          siteRenderer = (Renderer) servletContext.getAttribute( SITE_RENDERER_KEY );
  
          i18nDoxiaContexts = (Map<String, DoxiaBean>) servletContext.getAttribute( I18N_DOXIA_CONTEXTS_KEY );
  
          localesList = (List<Locale>) servletContext.getAttribute( LOCALES_LIST_KEY );
      }
  
      /**
       * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
       */
      public void doFilter( ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain )
          throws IOException, ServletException
      {
          HttpServletRequest req = (HttpServletRequest) servletRequest;
  
          // ----------------------------------------------------------------------
          // Handle the servlet path
          // ----------------------------------------------------------------------
          String path = req.getServletPath();
          // welcome file
          if ( path.endsWith( "/" ) )
          {
              path += "index.html";
          }
  
          // Remove the /
          path = path.substring( 1 );
  
          // Handle locale request
         SiteRenderingContext context;
         Map<String, DocumentRenderer> documents;
         File generatedSiteDirectory;
 
         String localeWanted = null;
         for ( Locale locale : localesList )
         {
             if ( path.startsWith( locale.getLanguage() + "/" ) )
             {
                 localeWanted = locale.toString();
                 path = path.substring( locale.getLanguage().length() + 1 );
             }
         }
 
         if ( localeWanted == null )
         {
             DoxiaBean defaultDoxiaBean = i18nDoxiaContexts.get( "default" );
             if ( defaultDoxiaBean == null )
             {
                 throw new ServletException( "No doxia bean found for the default locale" );
             }
             context = defaultDoxiaBean.getContext();
             documents = defaultDoxiaBean.getDocuments();
             generatedSiteDirectory = defaultDoxiaBean.getGeneratedSiteDirectory();
         }
         else
         {
             DoxiaBean i18nDoxiaBean = i18nDoxiaContexts.get( localeWanted );
             if ( i18nDoxiaBean == null )
             {
                 throw new ServletException( "No doxia bean found for the locale " + localeWanted );
             }
             context = i18nDoxiaBean.getContext();
             documents = i18nDoxiaBean.getDocuments();
             generatedSiteDirectory = i18nDoxiaBean.getGeneratedSiteDirectory();
         }
 
         // ----------------------------------------------------------------------
         // Handle report and documents
         // ----------------------------------------------------------------------
         if ( documents.containsKey( path ) )
         {
             try
             {
                 DocumentRenderer renderer = (DocumentRenderer) documents.get( path );
                 renderer.renderDocument( servletResponse.getWriter(), siteRenderer, context );
 
                 if ( renderer instanceof ReportDocumentRenderer )
                 {
                     ReportDocumentRenderer reportDocumentRenderer = (ReportDocumentRenderer) renderer;
                     if ( reportDocumentRenderer.isExternalReport() )
                     {
                         try
                         {
                             filterChain.doFilter( servletRequest, servletResponse );
                         }
                         catch ( Exception e )
                         {
                             throw new ServletException( e );
                         }
                     }
                 }
             }
             catch ( RendererException e )
             {
                 throw new ServletException( e );
             }
         }
         else if ( generatedSiteDirectory != null && generatedSiteDirectory.exists() )
         {
             context.getSiteDirectories().clear();
             context.addSiteDirectory( generatedSiteDirectory );
             try
             {
                 Map<String, DocumentRenderer> locateDocuments = siteRenderer.locateDocumentFiles( context );
 
                 if ( locateDocuments.containsKey( path ) )
                 {
                     DocumentRenderer renderer = (DocumentRenderer) locateDocuments.get( path );
                     renderer.renderDocument( servletResponse.getWriter(), siteRenderer, context );
                 }
             }
             catch ( RendererException e )
             {
                 throw new ServletException( e );
             }
 
             List<File> originalSiteDirectories = new ArrayList<File>( context.getSiteDirectories() );
             for ( File dir : originalSiteDirectories )
             {
                 context.addSiteDirectory( dir );
             }
         }
         else
         {
             filterChain.doFilter( servletRequest, servletResponse );
         }
     }
 
     /**
      * @see javax.servlet.Filter#destroy()
      */
     public void destroy()
     {
     }
 }