| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.callback; |
| |
| import org.apache.tapestry.IPage; |
| import org.apache.tapestry.IRequestCycle; |
| |
| /** |
| * Simple callback for returning to a page. |
| * <p> |
| * Example usage of <tt>PageCallback</tt>: |
| * <p> |
| * The Home page ensure a user is |
| * authenticated in the {@link org.apache.tapestry.IPage#validate(IRequestCycle)} |
| * method. If the user is not authenticated, they are redirected to the Login |
| * page, after setting a callback in the Login page. |
| * <p> |
| * The Login page <tt>formSubmit()</tt> {@link org.apache.tapestry.IActionListener} |
| * authenticates the user and then invokes {@link ICallback#performCallback(IRequestCycle)} |
| * to the Home page. |
| * <pre> |
| * public class Home extends BasePage { |
| * |
| * public void validate(IRequestCycle cycle) { |
| * Visit visit = (Visit) getVisit(); |
| * |
| * if (!visit.isAuthenticated()) { |
| * Login login = (Login) cycle.getPage("Login"); |
| * |
| * login.setCallback(new PageCallback(this)); |
| * |
| * throw new PageRedirectException(login); |
| * } |
| * } |
| * } |
| * |
| * public Login extends BasePage { |
| * |
| * private ICallback _callback; |
| * |
| * public void setCallback(ICallback _callback) { |
| * _callback = callback; |
| * } |
| * |
| * public void formSubmit(IRequestCycle cycle) { |
| * // Authentication code |
| * .. |
| * |
| * Visit visit = (Visit) getVisit(); |
| * |
| * visit.setAuthenticated(true); |
| * |
| * if (_callback != null) { |
| * _callback.performCallback(cycle); |
| * } |
| * } |
| * } |
| * </pre> |
| * |
| * @version $Id$ |
| * @author Howard Lewis Ship |
| * @since 0.2.9 |
| * |
| **/ |
| |
| public class PageCallback implements ICallback |
| { |
| /** |
| * @since 2.0.4 |
| * |
| **/ |
| |
| private static final long serialVersionUID = -3286806776105690068L; |
| |
| private String _pageName; |
| |
| public PageCallback(String pageName) |
| { |
| _pageName = pageName; |
| } |
| |
| public PageCallback(IPage page) |
| { |
| this(page.getPageName()); |
| } |
| |
| public String toString() |
| { |
| return "PageCallback[" + _pageName + "]"; |
| } |
| |
| /** |
| * Invokes {@link IRequestCycle#activate(String)} to select the previously |
| * identified page as the response page. |
| * |
| **/ |
| |
| public void performCallback(IRequestCycle cycle) |
| { |
| cycle.activate(_pageName); |
| } |
| } |