| // Copyright 2008 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.internal.services; |
| |
| import org.apache.tapestry.internal.InternalConstants; |
| import org.apache.tapestry.internal.structure.Page; |
| import org.apache.tapestry.ioc.internal.util.Defense; |
| import org.apache.tapestry.services.Request; |
| |
| import java.io.IOException; |
| |
| /** |
| * Alternative implementation, used when {@link org.apache.tapestry.SymbolConstants#SUPPRESS_REDIRECT_FROM_ACTION_REQUESTS} |
| * is set to true. |
| */ |
| public class ImmediateActionRenderResponseGenerator implements ActionRenderResponseGenerator |
| { |
| private final Request request; |
| |
| public ImmediateActionRenderResponseGenerator(Request request) |
| { |
| this.request = request; |
| } |
| |
| public void generateResponse(Page page) throws IOException |
| { |
| Defense.notNull(page, "page"); |
| |
| // This can happen when the ComponentEventRequestHandlerImpl notices that the response |
| // is not yet committed, and sets up to render a default response for the page containing |
| // the component. |
| if (request.getAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE) != null) return; |
| |
| // We are somewhere in the middle of processing an action request, possibly something |
| // complicated like a form submission. Tapestry components are not re-entrant, so we |
| // can't render the request right now, instead we record that we need to render |
| // a response as an attribute, and let a filter on the ComponentEventRequestHandler service |
| // do the work. |
| |
| request.setAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE, page); |
| } |
| } |