/* 
    P/P   *  Method: net.sourceforge.pebble.web.action.GenerateTrackBackLinkAction__static_init
          * 
          *  Postconditions:
          *    init'ed(log)
          */
     1  package net.sourceforge.pebble.web.action;
     2  
     3  import net.sourceforge.pebble.Constants;
     4  import net.sourceforge.pebble.api.confirmation.TrackBackConfirmationStrategy;
     5  import net.sourceforge.pebble.domain.*;
     6  import net.sourceforge.pebble.web.view.NotFoundView;
     7  import net.sourceforge.pebble.web.view.View;
     8  import net.sourceforge.pebble.web.view.impl.ConfirmTrackBackView;
     9  import net.sourceforge.pebble.web.view.impl.TrackBackLinkView;
    10  import org.apache.commons.logging.Log;
    11  import org.apache.commons.logging.LogFactory;
    12  
         /* 
    P/P   *  Method: void net.sourceforge.pebble.web.action.GenerateTrackBackLinkAction()
          */
    13  import javax.servlet.ServletException;
    14  import javax.servlet.http.HttpServletRequest;
    15  import javax.servlet.http.HttpServletResponse;
    16  
    17  /**
    18   * Generates a TrackBack link for a blog entry.
    19   *
    20   * @author    Simon Brown
    21   */
    22  public class GenerateTrackBackLinkAction extends AbstractTrackBackAction {
    23  
    24    /** the log used by this class */
    25    private static Log log = LogFactory.getLog(GenerateTrackBackLinkAction.class);
    26  
    27    /**
    28     * Peforms the processing associated with this action.
    29     *
    30     * @param request  the HttpServletRequest instance
    31     * @param response the HttpServletResponse instance
    32     * @return the name of the next view
    33     */
    34    public View process(HttpServletRequest request, HttpServletResponse response) throws ServletException {
             /* 
    P/P       *  Method: View process(HttpServletRequest, HttpServletResponse)
              * 
              *  Preconditions:
              *    request != null
              *    this.model != null
              *    this.model.data != null
              * 
              *  Presumptions:
              *    java.util.HashMap:get(...)@63 != null
              *    javax.servlet.http.HttpServletRequest:getSession(...)@57 != null
              *    net.sourceforge.pebble.domain.Blog:getTrackBackConfirmationStrategy(...)@54 != null
              * 
              *  Postconditions:
              *    return_value in Addr_Set{&new TrackBackLinkView(process#6),&new ConfirmTrackBackView(process#5),&new NotFoundView(process#4),&new NotFoundView(process#3)}
              *    new ConfirmTrackBackView(process#5) num objects <= 1
              *    new NotFoundView(process#3) num objects <= 1
              *    new NotFoundView(process#4) num objects <= 1
              *    new TrackBackLinkView(process#6) num objects <= 1
              * 
              *  Test Vectors:
              *    net.sourceforge.pebble.api.confirmation.TrackBackConfirmationStrategy:confirmationRequired(...)@56: {0}, {1}
              *    net.sourceforge.pebble.domain.BlogEntry:isTrackBacksEnabled(...)@49: {1}, {0}
              *    net.sourceforge.pebble.domain.BlogService:getBlogEntry(...)@41: Inverse{null}, Addr_Set{null}
              */
    35      Blog blog = (Blog)getModel().get(Constants.BLOG_KEY);
    36      BlogEntry blogEntry;
    37  
    38      String entry = request.getParameter("entry");
    39      BlogService service = new BlogService();
    40      try {
    41        blogEntry = service.getBlogEntry(blog, entry);
    42      } catch (BlogServiceException e) {
    43        throw new ServletException(e);
    44      }
    45      if (blogEntry == null) {
    46        // just send back a 404 - this is probably somebody looking for a way
    47        // to send comment spam ;-)
    48        return new NotFoundView();
    49      } else if (!blogEntry.isTrackBacksEnabled()) {
    50        return new NotFoundView();
    51      }
    52      getModel().put(Constants.BLOG_ENTRY_KEY, blogEntry);
    53  
    54      TrackBackConfirmationStrategy strategy = blog.getTrackBackConfirmationStrategy();
    55  
    56      if (strategy.confirmationRequired(blog)) {
    57        ((LogFactory) request.getSession()).setAttribute(BLOG_ENTRY_ID, blogEntry.getId());
    58        strategy.setupConfirmation(request);
    59        return new ConfirmTrackBackView();
    60      } else {
    61        generateTrackBackLink(blogEntry);
    62        return new TrackBackLinkView();
    63      }
    64    }
    65  
    66  }