ServletTemplateRenderer


1   /**
2    *
3    * Magnolia and its source-code is licensed under the LGPL.
4    * You may copy, adapt, and redistribute this file for commercial or non-commercial use.
5    * When copying, adapting, or redistributing this document in keeping with the guidelines above,
6    * you are required to provide proper attribution to obinary.
7    * If you reproduce or distribute the document without making any substantive modifications to its content,
8    * please use the following attribution line:
9    *
10   * Copyright 1993-2006 obinary Ltd. (http://www.obinary.com) All rights reserved.
11   *
12   */
13  package info.magnolia.module.templating.renderers;
14  
15  import info.magnolia.cms.beans.config.Template;
16  import info.magnolia.cms.util.ClassUtil;
17  
18  import java.io.IOException  ;
19  
20  import javax.servlet.ServletException  ;
21  import javax.servlet.http.HttpServlet  ;
22  import javax.servlet.http.HttpServletRequest  ;
23  import javax.servlet.http.HttpServletResponse  ;
24  
25  import org.apache.commons.lang.exception.NestableRuntimeException;
26  import org.slf4j.Logger;
27  import org.slf4j.LoggerFactory;
28  
29  
30  /**
31   * <p>
32   * Servlet template renderer, mapped to template type <code>servlet</code>. Servlet templates can have a
33   * <code>path</code> parameter like the jsp ones (request is forwarded to the specified path), or a
34   * <code>className</code> parameter.
35   * </p>
36   * <p>
37   * If <code>className</code> is set the servlet class will be instantiated and service() will be called (note the
38   * servlet will not properly be loaded by the container in this case, so don't rely on other methods except for
39   * doGet()/doPost() being called).
40   * </p>
41   * @author Fabrizio Giustina
42   * @version $Revision: 6341 $ ($Author: philipp $)
43   */
44  public class ServletTemplateRenderer extends JspTemplateRenderer {
45  
46      /**
47       * Logger.
48       */
49      private static Logger log = LoggerFactory.getLogger(ServletTemplateRenderer.class);
50  
51      /**
52       * @see JspTemplateRenderer#renderTemplate(Template, HttpServletRequest, HttpServletResponse)
53       */
54      public void renderTemplate(Template template, HttpServletRequest   request, HttpServletResponse   response)
55          throws IOException  , ServletException   {
56  
57          String   className = template.getParameter("className");
58  
59          if (className == null) {
60              // className not set, simply use path and forward this request
61              super.renderTemplate(template, request, response);
62              return;
63          }
64  
65          // use className
66          HttpServlet   servlet;
67          try {
68              servlet = (HttpServlet  ) ClassUtil.newInstance(className);
69          }
70          catch (Exception   e) {
71              // simply retrow to the client for now...
72              throw new NestableRuntimeException(e);
73          }
74  
75          servlet.service(request, response);
76  
77      }
78  
79  }
80
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