1   /*
    2    * Copyright 2003,2004 The Apache Software Foundation.
    3    * 
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    * 
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    * 
   10    * Unless required by applicable law or agreed to in writing, software
   11    * distributed under the License is distributed on an "AS IS" BASIS,
   12    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   13    * See the License for the specific language governing permissions and
   14    * limitations under the License.
   15    */
   16   
   17   package org.apache.struts.chain.servlet;
   18   
   19   
   20   import javax.servlet.http.HttpServletRequest;
   21   import org.apache.commons.chain.Context;
   22   import org.apache.commons.chain.web.servlet.ServletWebContext;
   23   import org.apache.struts.Globals;
   24   import org.apache.struts.chain.AbstractSelectModule;
   25   import org.apache.struts.chain.Constants;
   26   
   27   
   28   /**
   29    * <p>Cache the <code>ModuleConfig</code> and <code>MessageResources</code>
   30    * instances for the sub-application module to be used for processing
   31    * this request.</p>
   32    *
   33    * @author Craig R. McClanahan
   34    * @version $Rev: 54933 $ $Date: 2004-10-16 18:04:52 +0100 (Sat, 16 Oct 2004) $
   35    */
   36   
   37   public class SelectModule extends AbstractSelectModule {
   38   
   39   
   40       // ------------------------------------------------------- Protected Methods
   41   
   42   
   43       protected String getPrefix(Context context) {
   44   
   45           // Identify the URI from which we will match a module prefix
   46           ServletWebContext swcontext = (ServletWebContext) context;
   47           HttpServletRequest request = swcontext.getRequest();
   48           String uri =
   49               (String) request.getAttribute(Constants.INCLUDE_SERVLET_PATH);
   50           if (uri == null) {
   51               uri = request.getServletPath();
   52           }
   53           if (uri == null) {
   54               throw new IllegalArgumentException
   55                   ("No path information in request");
   56           }
   57   
   58           // Identify the module prefix for the current module
   59           String prefix = "";  // Initialize to default prefix
   60           String prefixes[] = (String[])
   61               swcontext.getApplicationScope().get(Globals.MODULE_PREFIXES_KEY);
   62           int lastSlash = 0;
   63           while (prefix.equals("") &&
   64                  ((lastSlash = uri.lastIndexOf("/")) > 0)) {
   65               uri = uri.substring(0, lastSlash);
   66               for (int i = 0; i < prefixes.length; i++) {
   67                   if (uri.equals(prefixes[i])) {
   68                       prefix = prefixes[i];
   69                       break;
   70                   }
   71               }
   72           }
   73   
   74           return (prefix);
   75   
   76       }
   77   
   78   
   79   }