001// Copyright 2008 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 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.EventConstants; 018import org.apache.tapestry5.internal.InternalConstants; 019import org.apache.tapestry5.internal.structure.Page; 020import org.apache.tapestry5.services.*; 021 022import java.io.IOException; 023 024public class ImmediateActionRenderResponseFilter implements ComponentEventRequestFilter 025{ 026 private final Request request; 027 028 private final Response response; 029 030 private final PageResponseRenderer renderer; 031 032 public ImmediateActionRenderResponseFilter(Request request, PageResponseRenderer renderer, Response response) 033 { 034 this.request = request; 035 this.renderer = renderer; 036 this.response = response; 037 } 038 039 public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler) 040 throws IOException 041 { 042 handler.handle(parameters); 043 044 // If markup or a redirect has already been generated, then we're good. 045 046 if (response.isCommitted()) return; 047 048 // Otherwise, we should be operating in immediate mode. Figure out which page 049 // was selected to render. 050 051 Page page = (Page) request.getAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE); 052 053 if (page != null) 054 { 055 // We don't have a context to provide but this still nags me as not the right thing to do. 056 057 page.getRootElement().triggerEvent(EventConstants.ACTIVATE, new Object[0], null); 058 059 renderer.renderPageResponse(page); 060 return; 061 } 062 063 throw new IllegalStateException( 064 "Sanity check - neither a stream response nor a redirect response was generated for this action request."); 065 } 066}