001 // Copyright 2004, 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.event; 016 017 import java.util.EventListener; 018 019 /** 020 * An interface for objects that want to take part in the validation of the 021 * page. 022 * 023 * @author Mindbridge 024 * @since 3.0 025 */ 026 027 public interface PageValidateListener extends EventListener 028 { 029 030 /** 031 * Invoked by the page from its 032 * {@link org.apache.tapestry.IPage#validate(org.apache.tapestry.IRequestCycle)} 033 * method. 034 * <p> 035 * May throw a {@link org.apache.tapestry.PageRedirectException}, to 036 * redirect the user to an appropriate part of the system (such as, a login 037 * page). 038 * 039 * @param event The originating event. 040 */ 041 042 void pageValidate(PageEvent event); 043 }