| // 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.engine; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.ServletException; |
| |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IComponent; |
| import org.apache.tapestry.IPage; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.request.RequestContext; |
| import org.apache.tapestry.request.ResponseOutputStream; |
| |
| /** |
| * Basic server for creating a link to another page in the application. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 1.0.9 |
| * |
| **/ |
| |
| public class PageService extends AbstractService |
| { |
| |
| public ILink getLink(IRequestCycle cycle, IComponent component, Object[] parameters) |
| { |
| if (Tapestry.size(parameters) != 1) |
| throw new IllegalArgumentException( |
| Tapestry.format("service-single-parameter", Tapestry.PAGE_SERVICE)); |
| |
| return constructLink(cycle, Tapestry.PAGE_SERVICE, new String[] {(String) parameters[0]}, null, true); |
| |
| } |
| |
| public void service( |
| IEngineServiceView engine, |
| IRequestCycle cycle, |
| ResponseOutputStream output) |
| throws ServletException, IOException |
| { |
| RequestContext context = cycle.getRequestContext(); |
| String[] serviceContext = getServiceContext(context); |
| |
| if (Tapestry.size(serviceContext) != 1) |
| throw new ApplicationRuntimeException( |
| Tapestry.format("service-single-parameter", Tapestry.PAGE_SERVICE)); |
| |
| String pageName = serviceContext[0]; |
| |
| // At one time, the page service required a session, but that is no longer necessary. |
| // Users can now bookmark pages within a Tapestry application. Pages |
| // can implement validate() and throw a PageRedirectException if they don't |
| // want to be accessed this way. For example, most applications have a concept |
| // of a "login" and have a few pages that don't require the user to be logged in, |
| // and other pages that do. The protected pages should redirect to a login page. |
| |
| IPage page = cycle.getPage(pageName); |
| |
| cycle.activate(page); |
| |
| engine.renderResponse(cycle, output); |
| } |
| |
| public String getName() |
| { |
| return Tapestry.PAGE_SERVICE; |
| } |
| |
| } |