ThrowawayControllerAdapter


1   /*
2    * $Id: ThrowawayControllerAdapter.java,v 1.5 2004/06/27 17:40:55 eelco12 Exp $
3    * $Source: /cvsroot/mav/maverick/src/java/org/infohazard/maverick/flow/ThrowawayControllerAdapter.java,v $
4    */
5   package org.infohazard.maverick.flow;
6   
7   import javax.servlet.ServletException  ;
8   
9   import org.jdom.Element;
10  
11  /**
12   * This adapter masquerades as a singleton controller but actually
13   * creates single-use instance controllers.
14   *
15   * created January 27, 2002
16   * @author Jeff Schnitzer
17   * @version $Revision: 1.5 $ $Date: 2004/06/27 17:40:55 $
18   */
19  public class ThrowawayControllerAdapter implements ControllerSingleton
20  {
21      /** class of controller. */
22      protected Class   controllerClass;
23  
24      /**
25       * Create the adapter.
26       * @param controllerClass the controller class
27       */
28      public ThrowawayControllerAdapter(Class   controllerClass)
29      {
30          this.controllerClass = controllerClass;
31      }
32  
33      /**
34       * Currently unused.
35       *
36       * @param controllerNode
37       * @exception ConfigException
38       */
39      public void init(Element controllerNode) throws ConfigException
40      {
41      }
42  
43      /**
44       * Instantiates a single-use controller, executes it, and returns the result.
45       * @param cctx the controller context.
46       * @return String logical view name (result of command method call of controller)
47       */
48      public String   go(ControllerContext cctx) throws ServletException  
49      {
50          try
51          {
52              Controller instance = (Controller)this.controllerClass.newInstance();
53  
54              return instance.go(cctx);
55          }
56          catch (InstantiationException   ex)
57          {
58              throw new ServletException  (ex);
59          }
60          catch (IllegalAccessException   ex)
61          {
62              throw new ServletException  (ex);
63          }
64      }
65  }
66  
67
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