/*

 Wotonomy: OpenStep design patterns for pure Java applications.

 Copyright (C) 2000 Blacksmith, Inc.

 This library is free software; you can redistribute it and/or

 modify it under the terms of the GNU Lesser General Public

 License as published by the Free Software Foundation; either

 version 2.1 of the License, or (at your option) any later version.

 This library is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public

 License along with this library; if not, see http://www.gnu.org

 */

 package net.wotonomy.web;

 import net.wotonomy.foundation.NSArray;

 /**

 * An implementation of WORequestHandler that dispatches

 * DirectActions. <br><br>

 *

 * See WODirectAction for the rules for parsing a request.

 * In short, className defaults to "DirectAction", and the

 * action defaults to "default".  The action class is expected

 * to have a constructor that takes a WORequest parameter.

 *

 * @author michael@mpowers.net

 * @author $Author: cgruber $

 * @version $Revision: 905 $

 */

 public class WODirectActionRequestHandler

         extends WORequestHandler

 {

     public WOResponse handleRequest (WORequest aRequest)

     {

         WOResponse response = null;

         // no concurrent access is allowed to a user's session:

         // a user/browser/machine with multiple requests will have to wait.

         // NOTE: this forces a session creation for any direct action (!)

         synchronized ( aRequest.request.getSession() )

         {

             WOApplication application = aRequest.application();

             WOContext context = WOContext.contextWithRequest( aRequest );

             String className = "DirectAction";

             String actionName = "default";

             NSArray path = aRequest.requestHandlerPathArray();

             if ( path.count() > 0 )

             {

                 className = path.objectAtIndex( 0 ).toString();

                 if ( path.count() > 1 )

                 {

                     actionName = path.objectAtIndex( path.count() - 1 ).toString();

                 }

                 if ( path.count() > 2 )

                 {

                     for ( int i = 1; i < path.count()-1; i++ )

                     {

                         className = className + "." +

                             path.objectAtIndex( i ).toString();

                     }

                 }

             }

             //FIXME: sessions are supposed to be lazily created for direct actions

             WOSession session = null;

             String sessionID = aRequest.sessionID();

             if ( sessionID != null )

             {

                 session = application.restoreSessionWithID( sessionID, context );

             }

             if ( session == null )

             {

                 session = application.createSessionForRequest( aRequest );

                 if ( session == null )

                 {

                     response = application.handleSessionCreationErrorInContext( context );

                 }

                 else

                 {

                     session.setContext( context );

                 }

             }

             context.setSession( session );

             application.awake();

             session.awake();

             try

             {

                 if ( response == null )

                 {

                     Class c = null;

                     c = application.getLocalClass( className );

                     if ( ( c == null ) && ( path.count() == 1 ) )

                     {

                         actionName = className;

                         className = "DirectAction";

                         c = application.getLocalClass( className );

                     }

                     if ( c == null )

                     {

                         throw new RuntimeException(

                             "Could not find class named \"" + className

                             + "\": " );

                     }

                     java.lang.reflect.Constructor ctor =

                         c.getConstructor( new Class[] { WORequest.class } );

                     WODirectAction action = (WODirectAction)

                         ctor.newInstance( new Object[] { aRequest } );

                     action.context = context; //HACK: how else can action call pageWithName?

                     WOActionResults result = action.performActionNamed( actionName );

                     if ( result instanceof WOComponent ) 

                     {

                         //HACK: I'm not sure where this should have gone: seems hackish here.

                         context.pushElement( (WOComponent) result );

                         ((WOComponent)result).ensureAwakeInContext( context );

                         //context.popElement();

                     }

                     response = result.generateResponse(); // calls session.savePage (?)

                     if ( result instanceof WOComponent ) 

                     {

                         //HACK: I'm not sure where this should have gone: seems hackish here.

                         ((WOComponent)result).sleep();

                     }

                 }

             }

             catch ( NoSuchMethodException exc )

             {

                 WOResponse error = new WOResponse();

                 exc.printStackTrace();

                 error.setStatus( 404 ); // not found

                 error.appendContentString(

                     "Could not find request constructor for class named \""

                         + className + "\": " );

                 response = error;

             }

             catch ( Exception exc )

             {

                 WOResponse error = new WOResponse();

                 error.setStatus( 500 ); // error

                 if ( exc.getMessage() != null )

                 {

                     error.appendContentString( exc.getMessage() );

                     exc.printStackTrace();

                 }

                 else

                 {

                     error.appendContentString( exc.toString() );

                     exc.printStackTrace();

                 }

                 response = error;

             }

             session.sleep();

             session.setContext( null );

             application.saveSessionForContext( context );

             application.sleep();

         }

         return response;

     }

 }

 /*

  * $Log$

  * Revision 1.2  2006/02/19 01:44:02  cgruber

  * Add xmlrpc files

  * Remove jclark and replace with dom4j and javax.xml.sax stuff

  * Re-work dependencies and imports so it all compiles.

  *

  * Revision 1.1  2006/02/16 13:22:22  cgruber

  * Check in all sources in eclipse-friendly maven-enabled packages.

  *

  * Revision 1.10  2003/03/28 17:26:18  mpowers

  * Implemented package support: Applications can now live in packages.

  * Better support for locating package local classes.

  *

  * Revision 1.9  2003/01/19 22:33:26  mpowers

  * Fixed problems with classpath and dynamic class loading.

  * Dynamic elements now pass on ensureAwakeInContext.

  * Parser how handles <standalone/> tags.

  *

  * Revision 1.8  2003/01/17 20:34:57  mpowers

  * Better handling for components and parents in the context's element stack.

  *

  * Revision 1.7  2003/01/15 19:50:49  mpowers

  * Fixed issues with WOSession and Serializable.

  * Can now persist sessions between classloaders (hot swap of class impls).

  *

  * Revision 1.5  2003/01/13 22:25:00  mpowers

  * Request-response cycle is working with session and page persistence.

  *

  * Revision 1.4  2003/01/09 21:16:49  mpowers

  * Bringing request-response cycle more into conformance.

  *

  * Revision 1.2  2002/12/17 14:57:44  mpowers

  * Minor corrections to WORequests's parsing, and updated javadocs.

  *

  * Revision 1.1.1.1  2000/12/21 15:53:19  mpowers

  * Contributing wotonomy.

  *

  * Revision 1.2  2000/12/20 16:25:50  michael

  * Added log to all files.

  *

  *

  */