| // Copyright 2008, 2009 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.tapestry5.upload.internal.services; |
| |
| import org.apache.commons.fileupload.FileUploadException; |
| import org.apache.tapestry5.annotations.Events; |
| import org.apache.tapestry5.internal.services.ComponentResultProcessorWrapper; |
| import org.apache.tapestry5.ioc.annotations.Primary; |
| import org.apache.tapestry5.runtime.Component; |
| import org.apache.tapestry5.services.*; |
| import org.apache.tapestry5.upload.services.MultipartDecoder; |
| import org.apache.tapestry5.upload.services.UploadEvents; |
| |
| import java.io.IOException; |
| |
| /** |
| * Determines if there was an {@link org.apache.commons.fileupload.FileUploadException} processing the request and, if |
| * so, triggers an exception event on the page. If the page fails to respond to the event, then |
| */ |
| @Events(UploadEvents.UPLOAD_EXCEPTION + " when a exception occur processing the upload") |
| public class UploadExceptionFilter implements ComponentEventRequestFilter |
| { |
| private final MultipartDecoder decoder; |
| |
| private final ComponentEventResultProcessor resultProcessor; |
| |
| private ComponentSource componentSource; |
| |
| public UploadExceptionFilter(MultipartDecoder decoder, |
| @Traditional @Primary ComponentEventResultProcessor resultProcessor, |
| ComponentSource componentSource) |
| { |
| this.decoder = decoder; |
| this.resultProcessor = resultProcessor; |
| this.componentSource = componentSource; |
| } |
| |
| public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler) |
| throws IOException |
| { |
| FileUploadException uploadException = decoder.getUploadException(); |
| |
| if (uploadException != null) |
| { |
| Component page = componentSource.getPage(parameters.getActivePageName()); |
| |
| ComponentResultProcessorWrapper callback = new ComponentResultProcessorWrapper(resultProcessor); |
| |
| page.getComponentResources().triggerEvent(UploadEvents.UPLOAD_EXCEPTION, new Object[] { uploadException }, |
| callback); |
| |
| // If an event handler exists and returns a value, then the callback will be aborted and a response |
| // (typically a redirect) will already have been sent to the client. |
| |
| if (callback.isAborted()) return; |
| |
| // If the page does not properly handle the exception, then we throw it now. |
| |
| throw new RuntimeException(UploadMessages.unableToDecode(), uploadException); |
| } |
| |
| |
| handler.handle(parameters); |
| } |
| } |