01: /* ***** BEGIN LICENSE BLOCK *****
02: * Version: MPL 1.1
03: * The contents of this file are subject to the Mozilla Public License Version
04: * 1.1 (the "License"); you may not use this file except in compliance with
05: * the License. You may obtain a copy of the License at
06: * http://www.mozilla.org/MPL/
07: *
08: * Software distributed under the License is distributed on an "AS IS" basis,
09: * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10: * for the specific language governing rights and limitations under the
11: * License.
12: *
13: * The Original Code is Riot.
14: *
15: * The Initial Developer of the Original Code is
16: * Neteye GmbH.
17: * Portions created by the Initial Developer are Copyright (C) 2007
18: * the Initial Developer. All Rights Reserved.
19: *
20: * Contributor(s):
21: * Felix Gnass [fgnass at neteye dot de]
22: *
23: * ***** END LICENSE BLOCK ***** */
24: package org.riotfamily.cachius.support;
25:
26: import javax.servlet.http.HttpServletRequest;
27: import javax.servlet.http.HttpServletRequestWrapper;
28: import javax.servlet.http.HttpSession;
29:
30: /**
31: * @author Felix Gnass [fgnass at neteye dot de]
32: * @since 6.5
33: */
34: public class SessionCreationPreventingRequestWrapper extends
35: HttpServletRequestWrapper {
36:
37: private boolean sessionExists;
38:
39: public SessionCreationPreventingRequestWrapper(
40: HttpServletRequest request) {
41: super (request);
42: sessionExists = request.getSession(false) != null;
43: }
44:
45: public HttpSession getSession() {
46: return getSession(true);
47: }
48:
49: public HttpSession getSession(boolean create) {
50: if (create && !sessionExists) {
51: throw new IllegalStateException(
52: "CacheableControllers must not "
53: + "create new HTTP sessions. Make sure that the session "
54: + "exists before you invoke the Controller.");
55: }
56: return super.getSession(create);
57: }
58:
59: }
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