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Java > Open Source Codes > org > enhydra > barracuda > contrib > dbroggisch > page > RenderPageHandler


1 /*
2  * Copyright (C) 2003 Diez B. Roggisch [deets@web.de]
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * $Id: RenderPageHandler.java,v 1.9 2004/02/01 05:16:27 christianc Exp $
19  */
20 package org.enhydra.barracuda.contrib.dbroggisch.page;
21
22 import java.io.IOException JavaDoc;
23 import javax.servlet.ServletException JavaDoc;
24 import javax.servlet.http.HttpServletRequest JavaDoc;
25 import javax.servlet.http.HttpSession JavaDoc;
26 import org.enhydra.barracuda.core.event.DefaultBaseEventListener;
27 import org.enhydra.barracuda.core.event.EventException;
28 import org.enhydra.barracuda.core.event.ViewEventContext;
29 import org.apache.log4j.Logger;
30
31
32 /**
33  * @author <a HREF="mailto:deets@web.de">Diez B. Roggisch</a>
34  * @version 1.0
35  */
36 public class RenderPageHandler extends DefaultBaseEventListener {
37
38     private static final Logger logger = Logger.getLogger(RenderPageHandler.class.getName());
39
40     public void handleViewEvent(ViewEventContext context)
41             throws EventException, ServletException JavaDoc, IOException JavaDoc {
42         HttpServletRequest JavaDoc req = context.getRequest();
43         HttpSession JavaDoc session = req.getSession(false);
44
45         Page page = null;
46         if (session != null) {
47             page = (Page)session.getAttribute(PageFactory.PAGE_KEY);
48         }
49         if (page == null) {
50             page = (Page)context.getState(PageFactory.PAGE_KEY);
51         }
52
53         if (page != null) {
54             page.render(context);
55             context.getEvent().setHandled(true);
56         } else {
57             logger.error("No page in session, no page in context, allow to fall through to error response event handlers");
58         }
59     }
60
61 }
62
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