001// Copyright 2006, 2007, 2008, 2009, 2010, 2011 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.TrackableComponentEventCallback; 018import org.apache.tapestry5.internal.structure.ComponentPageElement; 019import org.apache.tapestry5.internal.structure.Page; 020import org.apache.tapestry5.ioc.annotations.Primary; 021import org.apache.tapestry5.ioc.internal.util.TapestryException; 022import org.apache.tapestry5.services.*; 023 024import java.io.IOException; 025 026@SuppressWarnings("unchecked") 027public class ComponentEventRequestHandlerImpl implements ComponentEventRequestHandler 028{ 029 private final ComponentEventResultProcessor resultProcessor; 030 031 private final RequestPageCache cache; 032 033 private final Response response; 034 035 private final PageActivator pageActivator; 036 037 private final Environment environment; 038 039 public ComponentEventRequestHandlerImpl(@Traditional 040 @Primary 041 ComponentEventResultProcessor resultProcessor, 042 043 RequestPageCache cache, Response response, 044 045 PageActivator pageActivator, 046 047 Environment environment) 048 { 049 this.resultProcessor = resultProcessor; 050 this.cache = cache; 051 this.response = response; 052 this.pageActivator = pageActivator; 053 this.environment = environment; 054 } 055 056 public void handle(ComponentEventRequestParameters parameters) throws IOException 057 { 058 Page activePage = cache.get(parameters.getActivePageName()); 059 060 if (pageActivator.activatePage(activePage.getRootElement().getComponentResources(), parameters 061 .getPageActivationContext(), resultProcessor)) 062 { 063 return; 064 } 065 066 Page containerPage = cache.get(parameters.getContainingPageName()); 067 068 TrackableComponentEventCallback callback = new ComponentResultProcessorWrapper(resultProcessor); 069 070 environment.push(ComponentEventResultProcessor.class, resultProcessor); 071 environment.push(TrackableComponentEventCallback.class, callback); 072 073 ComponentPageElement element = containerPage.getComponentElementByNestedId(parameters.getNestedComponentId()); 074 075 boolean handled = element.triggerContextEvent(parameters.getEventType(), parameters.getEventContext(), callback); 076 077 if (!handled) 078 { 079 throw new TapestryException(String.format("Request event '%s' (on component %s) was not handled; you must provide a matching event handler method in the component or in one of its containers.", parameters.getEventType(), element.getCompleteId()), element, 080 null); 081 } 082 083 environment.pop(TrackableComponentEventCallback.class); 084 environment.pop(ComponentEventResultProcessor.class); 085 086 if (callback.isAborted()) 087 { 088 callback.rethrow(); 089 return; 090 } 091 092 // If we get this far without generating a response, the default behavior is to 093 // generate a redirect back to the active page; we can let the ComponentEventResultProcessor handle that. 094 095 if (!response.isCommitted()) 096 { 097 resultProcessor.processResultValue(activePage.getName()); 098 } 099 } 100}