Java tutorial
package fi.aalto.drumbeat.drumbeatUI; import java.io.IOException; import com.vaadin.server.FileDownloader; import com.vaadin.server.StreamResource; import com.vaadin.server.VaadinRequest; import com.vaadin.server.VaadinResponse; /* * The MIT License (MIT) Copyright (c) 2015 Jyrki Oraskari Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ public class OnDemandFileDownloader extends FileDownloader { private static final long serialVersionUID = 1L; private final OnDemandStreamResource onDemandStreamResource; private final String type; private final DrumbeatinterfaceUI parent; public OnDemandFileDownloader(OnDemandStreamResource onDemandStreamResource, String type, DrumbeatinterfaceUI parent) { super(new StreamResource(onDemandStreamResource, "")); this.onDemandStreamResource = onDemandStreamResource; this.type = type; this.parent = parent; } @Override public boolean handleConnectorRequest(VaadinRequest request, VaadinResponse response, String path) throws IOException { getResource().setFilename(onDemandStreamResource.getFilename()); return super.handleConnectorRequest(request, response, path); } private StreamResource getResource() { if (type.equals("JSON")) { StreamResource resource = new StreamResource(parent.createOnDemandJSON_Resource(), "output.srj"); return (StreamResource) resource; } else { StreamResource resource = new StreamResource(parent.createOnDemandXMLResource(), "output.xml"); return (StreamResource) resource; } } }