001// Copyright 2006, 2007, 2008, 2009, 2010 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 java.io.IOException; 018 019import org.apache.tapestry5.TrackableComponentEventCallback; 020import org.apache.tapestry5.internal.structure.ComponentPageElement; 021import org.apache.tapestry5.internal.structure.Page; 022import org.apache.tapestry5.ioc.annotations.Primary; 023import org.apache.tapestry5.ioc.internal.util.TapestryException; 024import org.apache.tapestry5.services.ComponentEventRequestHandler; 025import org.apache.tapestry5.services.ComponentEventRequestParameters; 026import org.apache.tapestry5.services.ComponentEventResultProcessor; 027import org.apache.tapestry5.services.Environment; 028import org.apache.tapestry5.services.Response; 029import org.apache.tapestry5.services.Traditional; 030 031@SuppressWarnings("unchecked") 032public class ComponentEventRequestHandlerImpl implements ComponentEventRequestHandler 033{ 034 private final ComponentEventResultProcessor resultProcessor; 035 036 private final RequestPageCache cache; 037 038 private final Response response; 039 040 private final PageActivator pageActivator; 041 042 private final ActionRenderResponseGenerator generator; 043 044 private final Environment environment; 045 046 public ComponentEventRequestHandlerImpl(@Traditional 047 @Primary 048 ComponentEventResultProcessor resultProcessor, 049 050 RequestPageCache cache, Response response, 051 052 PageActivator pageActivator, 053 054 ActionRenderResponseGenerator generator, Environment environment) 055 { 056 this.resultProcessor = resultProcessor; 057 this.cache = cache; 058 this.response = response; 059 this.pageActivator = pageActivator; 060 this.generator = generator; 061 this.environment = environment; 062 } 063 064 public void handle(ComponentEventRequestParameters parameters) throws IOException 065 { 066 Page activePage = cache.get(parameters.getActivePageName()); 067 068 if (pageActivator.activatePage(activePage.getRootElement().getComponentResources(), parameters 069 .getPageActivationContext(), resultProcessor)) 070 return; 071 072 Page containerPage = cache.get(parameters.getContainingPageName()); 073 074 TrackableComponentEventCallback callback = new ComponentResultProcessorWrapper(resultProcessor); 075 076 environment.push(ComponentEventResultProcessor.class, resultProcessor); 077 environment.push(TrackableComponentEventCallback.class, callback); 078 079 ComponentPageElement element = containerPage.getComponentElementByNestedId(parameters.getNestedComponentId()); 080 081 boolean handled = element 082 .triggerContextEvent(parameters.getEventType(), parameters.getEventContext(), callback); 083 084 if (!handled) 085 throw new TapestryException(ServicesMessages.eventNotHandled(element, parameters.getEventType()), element, 086 null); 087 088 environment.pop(TrackableComponentEventCallback.class); 089 environment.pop(ComponentEventResultProcessor.class); 090 091 if (callback.isAborted()) 092 { 093 callback.rethrow(); 094 return; 095 } 096 097 if (!response.isCommitted()) 098 generator.generateResponse(activePage); 099 } 100}