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    1   /*
    2    * $Id: DefaultActionSupport.java 651946 2008-04-27 13:41:38Z apetrelli $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
   10    * with the License.  You may obtain a copy of the License at
   11    *
   12    *  http://www.apache.org/licenses/LICENSE-2.0
   13    *
   14    * Unless required by applicable law or agreed to in writing,
   15    * software distributed under the License is distributed on an
   16    * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   17    * KIND, either express or implied.  See the License for the
   18    * specific language governing permissions and limitations
   19    * under the License.
   20    */
   21   package org.apache.struts2.dispatcher.ng.filter;
   22   
   23   import org.apache.struts2.StrutsStatics;
   24   import org.apache.struts2.dispatcher.Dispatcher;
   25   import org.apache.struts2.dispatcher.mapper.ActionMapping;
   26   import org.apache.struts2.dispatcher.ng.ExecuteOperations;
   27   import org.apache.struts2.dispatcher.ng.InitOperations;
   28   import org.apache.struts2.dispatcher.ng.PrepareOperations;
   29   
   30   import javax.servlet;
   31   import javax.servlet.http.HttpServletRequest;
   32   import javax.servlet.http.HttpServletResponse;
   33   import java.io.IOException;
   34   import java.util.List;
   35   import java.util.regex.Pattern;
   36   
   37   /**
   38    * Handles both the preparation and execution phases of the Struts dispatching process.  This filter is better to use
   39    * when you don't have another filter that needs access to action context information, such as Sitemesh.
   40    */
   41   public class StrutsPrepareAndExecuteFilter implements StrutsStatics, Filter {
   42       protected PrepareOperations prepare;
   43       protected ExecuteOperations execute;
   44   	protected List<Pattern> excludedPatterns = null;
   45   
   46       public void init(FilterConfig filterConfig) throws ServletException {
   47           InitOperations init = new InitOperations();
   48           try {
   49               FilterHostConfig config = new FilterHostConfig(filterConfig);
   50               init.initLogging(config);
   51               Dispatcher dispatcher = init.initDispatcher(config);
   52               init.initStaticContentLoader(config, dispatcher);
   53   
   54               prepare = new PrepareOperations(filterConfig.getServletContext(), dispatcher);
   55               execute = new ExecuteOperations(filterConfig.getServletContext(), dispatcher);
   56   			this.excludedPatterns = init.buildExcludedPatternsList(dispatcher);
   57   
   58               postInit(dispatcher, filterConfig);
   59           } finally {
   60               init.cleanup();
   61           }
   62   
   63       }
   64   
   65       /**
   66        * Callback for post initialization
   67        */
   68       protected void postInit(Dispatcher dispatcher, FilterConfig filterConfig) {
   69       }
   70   
   71       public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
   72   
   73           HttpServletRequest request = (HttpServletRequest) req;
   74           HttpServletResponse response = (HttpServletResponse) res;
   75   
   76           try {
   77               prepare.setEncodingAndLocale(request, response);
   78               prepare.createActionContext(request, response);
   79               prepare.assignDispatcherToThread();
   80   			if ( excludedPatterns != null && prepare.isUrlExcluded(request, excludedPatterns)) {
   81   				chain.doFilter(request, response);
   82   			} else {
   83   				request = prepare.wrapRequest(request);
   84   				ActionMapping mapping = prepare.findActionMapping(request, response, true);
   85   				if (mapping == null) {
   86   					boolean handled = execute.executeStaticResourceRequest(request, response);
   87   					if (!handled) {
   88   						chain.doFilter(request, response);
   89   					}
   90   				} else {
   91   					execute.executeAction(request, response, mapping);
   92   				}
   93   			}
   94           } finally {
   95               prepare.cleanupRequest(request);
   96           }
   97       }
   98   
   99       public void destroy() {
  100           prepare.cleanupDispatcher();
  101       }
  102   }

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