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From d..@apache.org
Subject cvs commit: jakarta-commons-sandbox/util/src/java/org/apache/commons/util/http RequestUtils.java
Date Wed, 28 Nov 2001 10:32:16 GMT
dlr         01/11/28 02:32:16

  Added:       util/src/java/org/apache/commons/util/http RequestUtils.java
  Log:
  Added class by Lance Lavandowska <lance@brainopolis.com> with some
  tweaks by myself.
  
  Revision  Changes    Path
  1.1                  jakarta-commons-sandbox/util/src/java/org/apache/commons/util/http/RequestUtils.java
  
  Index: RequestUtils.java
  ===================================================================
  package org.apache.commons.util.http;
  
  /*
   * Copyright (c) 1997-2000 The Java Apache Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the Java Apache
   *    Project for use in the Apache JServ servlet engine project
   *    <http://java.apache.org/>."
   *
   * 4. The names "Apache JServ", "Apache JServ Servlet Engine", "Turbine",
   *    "Apache Turbine", "Turbine Project", "Apache Turbine Project" and
   *    "Java Apache Project" must not be used to endorse or promote products
   *    derived from this software without prior written permission.
   *
   * 5. Products derived from this software may not be called "Apache JServ"
   *    nor may "Apache" nor "Apache JServ" appear in their names without
   *    prior written permission of the Java Apache Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the Java Apache
   *    Project for use in the Apache JServ servlet engine project
   *    <http://java.apache.org/>."
   *
   * THIS SOFTWARE IS PROVIDED BY THE JAVA APACHE PROJECT "AS IS" AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE JAVA APACHE PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Java Apache Group. For more information
   * on the Java Apache Project and the Apache JServ Servlet Engine project,
   * please see <http://java.apache.org/>.
   *
   */
  
  import javax.servlet.http.HttpServletRequest;
  import org.apache.commons.util.StringUtils;
  
  /**
   * This class provides utilities for getting information from
   * javax.servlet.http.HttpServletRequest.
   *
   * @author <a href="mailto:lance@brainopolis.com">Lance Lavandowska</a>
   * @version $Id: RequestUtils.java,v 1.1 2001/11/28 10:32:15 dlr Exp $
   */
  public class RequestUtils
  {
      /**
       * Tries several variations of the header name in an attempt to
       * find a value for the header.  Header name should start with
       * format: all caps, words seperated with an underscore.  JRun
       * uses underscore with all capital letters, Resin uses dash with
       * title case, and OrionServer uses dash with all capitals, etc.
       *
       * @param request The HttpRequest in which to look for Header.
       * @param header  The String with the beginning name of Header.
       *
       * @return The String value of the header, or NULL if cannot be found.
       */
      public static String findHeader(HttpServletRequest request, String header)
      {
          // underscore w/allCap
          String headerValue = request.getHeader(header);
          if (headerValue == null)
          {
              // underscore w/ title case
              header = RequestUtils.headerToTitleCase(header.toLowerCase()); 
              headerValue = request.getHeader(header);
              if (headerValue == null)
              {           
                  // dash w/ title case
                  header = StringUtils.replace(header, "_", "-"); 
                  headerValue = request.getHeader(header);
                  if (headerValue == null)
                  {
                      // dash w/ all caps
                      header = header.toUpperCase(); 
                      headerValue = request.getHeader(header);
                      if (headerValue == null)
                      {
                          // dash w/ all lower
                          header = header.toLowerCase(); 
                          headerValue = request.getHeader(header);
                          if (headerValue == null)
                          {
                              // underscore w/ all lower
                              header = StringUtils.replace(header, "-", "_"); 
                              headerValue = request.getHeader(header);
                          }
                      }
                  }
              }
          }
          return headerValue;
      }
  
      /**
       * Special implemenation - just for request headers.  Capitalizes
       * the first letter of each word.  Depends on words being
       * separated with "_" or "-".  FIXME: Assumes only one separator,
       * doesn't properly check header name string indices.
       *
       * @param header The HTTP header string to capitalize the distinct
       * words of.
       * @return The modified value of the header.
       */
      public static String headerToTitleCase(String header)
      {
          int underscoreLoc = header.indexOf("_");
          if (underscoreLoc == -1) underscoreLoc = header.indexOf("-");
          String firstChar = header.substring(0, 1).toUpperCase();
          if (underscoreLoc != -1)
          {
              String secondChar =
                  header.substring(underscoreLoc + 1, underscoreLoc + 2)
                  .toUpperCase();
              header = firstChar + header.substring(1, underscoreLoc + 1) +
                  secondChar + header.substring(underscoreLoc+2);
          }
          else
          {
              header = firstChar + header.substring(1);
          }
          return header;
      }
  }
  
  
  

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