package org.apache.turbine.util;

 /*

  * 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 java.util.StringTokenizer;

 import javax.servlet.ServletConfig;

 import javax.servlet.ServletContext;

 import org.apache.commons.lang.StringUtils;

 import org.apache.turbine.Turbine;

 /**

  * This is where common Servlet manipulation routines should go.

  *

  * @author <a href="mailto:gonzalo.diethelm@sonda.com">Gonzalo Diethelm</a>

  * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>

  * @version $Id: ServletUtils.java 1709648 2015-10-20 17:08:10Z tv $

  */

 public class ServletUtils

 {

     /**

      * Expands a string that points to a relative path or path list,

      * leaving it as an absolute path based on the servlet context.

      * It will return null if the text is empty or the config object

      * is null.

      *

      * @param config The ServletConfig.

      * @param text The String containing a path or path list.

      * @return A String with the expanded path or path list.

      */

     public static String expandRelative(ServletConfig config,

                                         String text)

     {

         if (StringUtils.isEmpty(text))

         {

             return text;

         }

         if (config == null)

         {

             return null;

         }

         // attempt to make it relative

         if (!text.startsWith("/") && !text.startsWith("./")

                 && !text.startsWith("\\") && !text.startsWith(".\\"))

         {

             StringBuilder sb = new StringBuilder();

             sb.append("./");

             sb.append(text);

             text = sb.toString();

         }

         ServletContext context = config.getServletContext();

         String base = context.getRealPath("/");

         base = (StringUtils.isEmpty(base))

             ? config.getInitParameter(Turbine.BASEDIR_KEY)

             : base;

         if (StringUtils.isEmpty(base))

         {

             return text;

         }

         String separator = System.getProperty("path.separator");

         StringTokenizer tokenizer = new StringTokenizer(text,

                 separator);

         StringBuilder buffer = new StringBuilder();

         while (tokenizer.hasMoreTokens())

         {

             buffer.append(base).append(tokenizer.nextToken());

             if (tokenizer.hasMoreTokens())

             {

                 buffer.append(separator);

             }

         }

         return buffer.toString();

     }

 }