| // 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.ApplicationRuntimeException; |
| import org.apache.tapestry.IExternalPage; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * A callback for returning to an {@link org.apache.tapestry.IExternalPage}. |
| * <p> |
| * Example usage of <tt>ExternalCallback</tt>: |
| * <p> |
| * The External 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 External page. |
| * <pre> |
| * public class External extends BasePage implements IExternalPage { |
| * |
| * private Integer _itemId; |
| * |
| * public void validate(IRequestCycle cycle) throws RequestCycleException { |
| * Visit visit = (Visit) getVisit(); |
| * |
| * if (!visit.isAuthenticated()) { |
| * Login login = (Login) cycle.getPage("Login"); |
| * |
| * login.setCallback |
| * (new ExternalCallback(this, cycle.getServiceParameters())); |
| * |
| * throw new PageRedirectException(login); |
| * } |
| * } |
| * |
| * public void activateExternalPage(Object[] params, IRequestCycle cycle) |
| * throws RequestCycleException { |
| * _itemId = (Integer) params[0]; |
| * } |
| * } |
| * |
| * 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> |
| * |
| * @see org.apache.tapestry.IExternalPage |
| * @see org.apache.tapestry.engine.ExternalService |
| * |
| * @version $Id$ |
| * @author Malcolm Edgar |
| * @since 2.3 |
| * |
| **/ |
| |
| public class ExternalCallback implements ICallback |
| { |
| private String _pageName; |
| private Object[] _parameters; |
| |
| /** |
| * Creates a new ExternalCallback for the named <tt>IExternalPage</tt>. |
| * The parameters (which may be null) is retained, not copied. |
| * |
| **/ |
| |
| public ExternalCallback(String pageName, Object[] parameters) |
| { |
| _pageName = pageName; |
| _parameters = parameters; |
| } |
| |
| /** |
| * Creates a new ExternalCallback for the page. The parameters |
| * (which may be null) is retained, not copied. |
| * |
| **/ |
| |
| public ExternalCallback(IExternalPage page, Object[] parameters) |
| { |
| _pageName = page.getPageName(); |
| _parameters = parameters; |
| } |
| |
| /** |
| * Invokes {@link IRequestCycle#setPage(String)} to select the previously |
| * identified <tt>IExternalPage</tt> as the response page and activates |
| * the page by invoking <tt>activateExternalPage()</tt> with the callback |
| * parameters and request cycle. |
| * |
| **/ |
| |
| public void performCallback(IRequestCycle cycle) |
| { |
| try |
| { |
| IExternalPage page = (IExternalPage) cycle.getPage(_pageName); |
| |
| cycle.activate(page); |
| |
| page.activateExternalPage(_parameters, cycle); |
| } |
| catch (ClassCastException ex) |
| { |
| throw new ApplicationRuntimeException( |
| Tapestry.format("ExternalCallback.page-not-compatible", _pageName), |
| ex); |
| } |
| } |
| |
| public String toString() |
| { |
| StringBuffer buffer = new StringBuffer("ExternalCallback["); |
| |
| buffer.append(_pageName); |
| buffer.append('/'); |
| |
| if (_parameters != null) |
| { |
| String sep = " "; |
| |
| for (int i = 0; i < _parameters.length; i++) |
| { |
| buffer.append(sep); |
| buffer.append(_parameters[i]); |
| |
| sep = ", "; |
| } |
| } |
| |
| buffer.append(']'); |
| |
| return buffer.toString(); |
| } |
| } |