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package com.vaadin.tests.resources;
import java.io.IOException;
import java.io.InputStream;
import com.vaadin.annotations.Push;
import com.vaadin.server.DownloadStream;
import com.vaadin.server.Resource;
import com.vaadin.server.StreamResource;
import com.vaadin.server.VaadinRequest;
import com.vaadin.tests.components.AbstractTestUIWithLog;
import com.vaadin.ui.Button;
@Push
public class DownloadWithPush extends AbstractTestUIWithLog {
private static class GeneratedStream extends InputStream {
int read = 0;
int next = 'a';
private final int size;
public GeneratedStream(int size) {
this.size = size;
}
@Override
public int read() throws IOException {
if (available() == 0) {
return -1;
}
read++;
next++;
if (next > 'z') {
next = 'a';
}
return next;
}
@Override
public int available() throws IOException {
return size - read;
}
}
private final class DownloadResoure extends StreamResource {
private DownloadResoure(StreamSource streamSource, String filename) {
super(streamSource, filename);
}
@Override
public DownloadStream getStream() {
DownloadStream ds = super.getStream();
ds.setParameter("Content-Disposition",
"attachment; filename=" + getFilename() + ";");
return ds;
}
}
private Resource hugeFileResource = createResource();;
private int fileSize = 300 * (1024 * 1024);
@Override
protected void setup(VaadinRequest request) {
Button b = new Button("Download a "
+ String.format("%.1f", fileSize / 1024.0 / 1024.0) + "MB file",
event -> getUI().getPage().open(hugeFileResource, "", false));
addComponent(b);
}
private Resource createResource() {
Resource hugeFileResource = new DownloadResoure(
() -> new GeneratedStream(fileSize), "hugefile.txt");
return hugeFileResource;
}
@Override
protected Integer getTicketNumber() {
return 19709;
}
}
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