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Posted to dev@velocity.apache.org by da...@locus.apache.org on 2000/11/03 03:45:06 UTC

cvs commit: jakarta-velocity/examples/forumdemo/WEB-INF/src/org/apache/velocity/demo ControllerServlet.java

daveb       00/11/02 18:45:06

  Added:       examples/forumdemo/WEB-INF/src/org/apache/velocity/demo
                        ControllerServlet.java
  Log:
  Initial add.
  
  Revision  Changes    Path
  1.1                  jakarta-velocity/examples/forumdemo/WEB-INF/src/org/apache/velocity/demo/ControllerServlet.java
  
  Index: ControllerServlet.java
  ===================================================================
  package org.apache.velocity.demo;
  
  /* 
   * The Apache Software License, Version 1.1
   *
   * Copyright (c) 1999 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
   *    any, must include the following acknowlegement:  
   *       "This product includes software developed by the 
   *        Apache Software Foundation (http://www.apache.org/)."
   *    Alternately, this acknowlegement may appear in the software itself,
   *    if and wherever such third-party acknowlegements normally appear.
   *
   * 4. The names "The Jakarta Project", "Jakarta-Regexp", and "Apache Software
   *    Foundation" must not be used to endorse or promote products derived
   *    from this software without prior written permission. For written 
   *    permission, please contact apache@apache.org.
   *
   * 5. Products derived from this software may not be called "Apache"
   *    nor may "Apache" appear in their names without prior written
   *    permission of the Apache Group.
   *
   * THIS SOFTWARE IS PROVIDED ``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 APACHE SOFTWARE FOUNDATION 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 Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */ 
  
  // Java stuff
  import java.util.*;
  
  // Servlet stuff
  import javax.servlet.*;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  // Velocity stuff
  import org.apache.velocity.Context;
  import org.apache.velocity.Template;
  import org.apache.velocity.servlet.VelocityServlet;
  
  // Demo stuff
  import org.apache.velocity.demo.action.*;
  
  /**
   * Main entry point into the forum application.
   * All requests are made to this servlet.
   * 
   * @author <a href="mailto:daveb@miceda-data.com">Dave Bryson</a>
   * @version $Revision: 1.1 $
   * $Id: ControllerServlet.java,v 1.1 2000/11/03 02:45:05 daveb Exp $
   */
  public class ControllerServlet extends VelocityServlet
  {
      /**
       * VelocityServlet handles most of the Servlet issues.
       * By extending it, you need to just implement the handleRequest method.
       * @param the Context created in VelocityServlet.
       * @return the template
       */
      public Template handleRequest( Context ctx )
      {
          HttpServletRequest req = (HttpServletRequest)ctx.get(VelocityServlet.REQUEST);
          HttpServletResponse resp = (HttpServletResponse)ctx.get(VelocityServlet.RESPONSE);
          Template template = null;
          
          try
          {
              // Process the command
              String templateName = processRequest( req, resp, ctx );
              // Get the template
              template  = getTemplate( templateName );
          }
          catch( Exception e )
          {
              System.out.println("Error handling the request: " + e);
          }
          return template;
      }
      
      /**
       * Process the request and execute the command.
       * Uses a command pattern
       * @param the request
       * @param the response 
       * @param the context
       * @return the name of the template to use
       */
      private String processRequest( HttpServletRequest req, HttpServletResponse resp, Context context )
       throws Exception
      {
          Command c = null;
          String template = null;
          String name = req.getParameter("action");
          
          if ( name == null || name.length() == 0 )
          {
              throw new Exception("Unrecognized action request!");
          }
                  
          if ( name.equalsIgnoreCase("list") )
          {
              c = new ListCommand( req, resp);
              template = c.exec( context );
          }
          else if ( name.equalsIgnoreCase("post") ) 
          {
              c = new PostCommand( req, resp );
              template = c.exec( context ); 
          }
          else if (  name.equalsIgnoreCase("reply") )
          {
              c = new ReplyCommand( req, resp );
              template = c.exec( context );
          }
          else if (  name.equalsIgnoreCase("postreply") )
          {
              c = new PostReplyCommand( req, resp );
              template = c.exec( context );
          }
          else if ( name.equalsIgnoreCase("view") )
          {
              c = new ViewCommand( req, resp );
              template = c.exec( context );
          }
          return template;
      }
  }