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Java > Open Source Codes > org > apache > tapestry > vlib > AdminPage


1 // Copyright 2004 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.vlib;
16
17 import org.apache.tapestry.IRequestCycle;
18 import org.apache.tapestry.PageRedirectException;
19 import org.apache.tapestry.callback.PageCallback;
20 import org.apache.tapestry.event.PageEvent;
21 import org.apache.tapestry.vlib.pages.Login;
22
23 /**
24  * Base page for any pages restricted to administrators.
25  *
26  * @author Howard Lewis Ship
27  * @version $Id: AdminPage.java,v 1.7 2004/02/19 17:37:49 hlship Exp $
28  *
29  **/
30
31 public abstract class AdminPage extends Protected implements IMessageProperty
32 {
33
34     public void pageValidate(PageEvent event)
35     {
36         IRequestCycle cycle = event.getRequestCycle();
37         Visit visit = (Visit) getEngine().getVisit();
38
39         if (visit == null || !visit.isUserLoggedIn())
40         {
41             Login login = (Login) cycle.getPage("Login");
42
43             login.setCallback(new PageCallback(this));
44
45             throw new PageRedirectException(login);
46         }
47
48         if (!visit.getUser(cycle).isAdmin())
49         {
50             VirtualLibraryEngine vengine = (VirtualLibraryEngine) getEngine();
51
52             vengine.presentError("That function is restricted to adminstrators.", cycle);
53
54             throw new PageRedirectException(cycle.getPage());
55         }
56     }
57 }
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