PageValidateListener


1   // Copyright 2004, 2005 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.event;
16  
17  import java.util.EventListener  ;
18  
19  /**
20   *  An interface for objects that want to take part in the validation of the page.
21   *
22   *  @author Mindbridge
23   *  @since 3.0
24   **/
25  
26  public interface PageValidateListener extends EventListener  
27  {
28      /**
29       *  Invoked by the page from its
30       *  {@link org.apache.tapestry.IPage#validate(org.apache.tapestry.IRequestCycle)} method.
31       *
32       *  <p>May throw a {@link org.apache.tapestry.PageRedirectException}, to redirect the user
33       *  to an appropriate part of the system (such as, a login page).
34       **/
35  
36      public void pageValidate(PageEvent event);
37  }
38

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