| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.openaz.xacml.admin.util; |
| |
| import java.io.IOException; |
| |
| import com.vaadin.server.FileDownloader; |
| import com.vaadin.server.StreamResource; |
| import com.vaadin.server.StreamResource.StreamSource; |
| import com.vaadin.server.VaadinRequest; |
| import com.vaadin.server.VaadinResponse; |
| import com.vaadin.ui.UI; |
| |
| public class OnDemandFileDownloader extends FileDownloader { |
| private static final long serialVersionUID = 1L; |
| private final OnDemandStreamResource resource; |
| |
| public interface OnDemandStreamResource extends StreamSource { |
| String getFilename (); |
| } |
| |
| public OnDemandFileDownloader(OnDemandStreamResource resource) { |
| super(new StreamResource(resource, "")); |
| this.resource = resource; |
| if (this.resource == null) { |
| throw new NullPointerException("Can't send null resource"); |
| } |
| } |
| |
| @Override |
| public boolean handleConnectorRequest(VaadinRequest request, |
| VaadinResponse response, String path) throws IOException { |
| this.getResource().setFilename(this.resource.getFilename()); |
| return super.handleConnectorRequest(request, response, path); |
| } |
| |
| private StreamResource getResource() { |
| StreamResource resource = null; |
| UI.getCurrent().getSession().lock(); |
| try { |
| resource = (StreamResource) this.getResource("dl"); |
| } finally { |
| UI.getCurrent().getSession().unlock(); |
| } |
| return resource; |
| } |
| } |