/* 
    P/P   *  Method: net.sourceforge.pebble.web.filter.DispatchingFilter__static_init
          * 
          *  Postconditions:
          *    init'ed(log)
          */
     1  /*
     2   * Copyright (c) 2003-2006, Simon Brown
     3   * All rights reserved.
     4   *
     5   * Redistribution and use in source and binary forms, with or without
     6   * modification, are permitted provided that the following conditions are met:
     7   *
     8   *   - Redistributions of source code must retain the above copyright
     9   *     notice, this list of conditions and the following disclaimer.
    10   *
    11   *   - Redistributions in binary form must reproduce the above copyright
    12   *     notice, this list of conditions and the following disclaimer in
    13   *     the documentation and/or other materials provided with the
    14   *     distribution.
    15   *
    16   *   - Neither the name of Pebble nor the names of its contributors may
    17   *     be used to endorse or promote products derived from this software
    18   *     without specific prior written permission.
    19   *
    20   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    21   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    23   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    24   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    25   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    26   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    27   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    28   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    29   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    30   * POSSIBILITY OF SUCH DAMAGE.
    31   */
    32  package net.sourceforge.pebble.web.filter;
    33  
    34  import net.sourceforge.pebble.Constants;
    35  import org.apache.commons.logging.Log;
    36  import org.apache.commons.logging.LogFactory;
    37  
    38  import javax.servlet.*;
    39  import java.io.IOException;
    40  
    41  /**
    42   * A filter that dispatches to the internal URI.
    43   *
    44   * @author    Simon Brown
    45   */
         /* 
    P/P   *  Method: void net.sourceforge.pebble.web.filter.DispatchingFilter()
          */
    46  public class DispatchingFilter implements Filter {
    47  
    48    /** the log used by this class */
    49    private static Log log = LogFactory.getLog(DispatchingFilter.class);
    50  
    51    /** the config of this filter */
    52    private FilterConfig filterConfig;
    53  
    54    /**
    55     * Initialises this instance.
    56     *
    57     * @param config    a FilterConfig instance
    58     */
           /* 
    P/P     *  Method: void init(FilterConfig)
            * 
            *  Postconditions:
            *    this.filterConfig == config
            *    init'ed(this.filterConfig)
            */
    59    public void init(FilterConfig config) {
    60      this.filterConfig = config;
    61    }
    62  
    63    /**
    64     * Called when this filter is taken out of service.
    65     */
           /* 
    P/P     *  Method: void destroy()
            */
    66    public void destroy() {
    67    }
    68  
    69    /**
    70     * Contains the processing associated with this filter.
    71     */
    72    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
    73        throws ServletException, IOException {
    74  
    75      String uri = (String)request.getAttribute(Constants.INTERNAL_URI);
    76  
    77      try {
    78        log.trace("Dispatching to " + uri);
    79        RequestDispatcher dispatcher = request.getRequestDispatcher(uri);
    80        dispatcher.forward(request, response);
    81      } catch (Exception e) {
    82        throw new ServletException(e);
    83      }
    84    }
    85  
    86  }