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package com.vaadin.tests.components;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import com.vaadin.server.ClassResource;
import com.vaadin.server.ConnectorResource;
import com.vaadin.server.FileDownloader;
import com.vaadin.server.FileResource;
import com.vaadin.server.StreamResource;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinResponse;
import com.vaadin.tests.components.embedded.EmbeddedPdf;
import com.vaadin.ui.AbstractComponent;
import com.vaadin.ui.Button;
import com.vaadin.ui.Component;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Layout;
import com.vaadin.ui.NativeButton;
public class FileDownloaderUI extends AbstractTestUIWithLog {
private AbstractComponent firstDownloadComponent;
@Override
protected void setup(VaadinRequest request) {
List<Class<? extends Component>> components = new ArrayList<>();
components.add(Button.class);
components.add(NativeButton.class);
components.add(CssLayout.class);
components.add(Label.class);
ConnectorResource resource;
resource = new StreamResource(new StreamResource.StreamSource() {
@Override
public InputStream getStream() {
try {
BufferedImage img = getImage2("demo.png");
ByteArrayOutputStream imagebuffer = new ByteArrayOutputStream();
ImageIO.write(img, "png", imagebuffer);
Thread.sleep(5000);
return new ByteArrayInputStream(imagebuffer.toByteArray());
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
}, "demo.png");
addComponents("Dynamic image", resource, components);
try {
File hugeFile = File.createTempFile("huge", ".txt");
hugeFile.deleteOnExit();
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream(hugeFile));
int writeAtOnce = 1024 * 1024;
byte[] b = new byte[writeAtOnce];
for (int i = 0; i < 5l * 1024l * 1024l; i += writeAtOnce) {
os.write(b);
}
os.close();
resource = new FileResource(hugeFile);
addComponents("Huge text file", resource, components);
} catch (IOException e) {
e.printStackTrace();
}
resource = new ClassResource(new EmbeddedPdf().getClass(), "test.pdf");
addComponents("Class resource pdf", resource, components);
Button downloadUtf8File = new Button("Download UTF-8 named file");
FileDownloader fd = new FileDownloader(new ClassResource(
new EmbeddedPdf().getClass(), "File åäö-日本語.pdf"));
fd.setOverrideContentType(false);
fd.extend(downloadUtf8File);
addComponent(downloadUtf8File);
addComponent(new Button("Remove first download button", event -> {
Layout parent = (Layout) firstDownloadComponent.getParent();
parent.removeComponent(firstDownloadComponent);
}));
addComponent(new Button(
"Detach FileDownloader from first download button", event -> {
FileDownloader e = (FileDownloader) firstDownloadComponent
.getExtensions().iterator().next();
e.remove();
log("FileDownload detached");
}));
}
public void addComponents(String caption, ConnectorResource resource,
List<Class<? extends Component>> components) {
HorizontalLayout layout = new HorizontalLayout();
layout.setCaption(caption);
for (Class<? extends Component> cls : components) {
try {
AbstractComponent c = (AbstractComponent) cls.newInstance();
if (firstDownloadComponent == null) {
firstDownloadComponent = c;
}
c.setId(cls.getName() + caption.replace(" ", ""));
c.setCaption(cls.getName());
c.setDescription(
resource.getMIMEType() + " / " + resource.getClass());
c.setWidth("100px");
c.setHeight("100px");
layout.addComponent(c);
new FileDownloader(resource).extend(c);
if (c instanceof Button) {
((Button) c).addClickListener(event -> {
});
}
} catch (Exception e) {
System.err.println("Could not instatiate " + cls.getName());
}
}
addComponent(layout);
}
private static final String DYNAMIC_IMAGE_NAME = "requestImage.png";
@Override
public boolean handleConnectorRequest(VaadinRequest request,
VaadinResponse response, String path) throws IOException {
if (DYNAMIC_IMAGE_NAME.equals(path)) {
// Create an image, draw the "text" parameter to it and output it to
// the browser.
String text = request.getParameter("text");
if (text == null) {
text = DYNAMIC_IMAGE_NAME;
}
BufferedImage bi = getImage(text);
response.setContentType("image/png");
response.setHeader("Content-Disposition",
"attachment; filename=\"" + path + "\"");
ImageIO.write(bi, "png", response.getOutputStream());
return true;
} else {
return super.handleConnectorRequest(request, response, path);
}
}
private BufferedImage getImage(String text) {
BufferedImage bi = new BufferedImage(150, 30,
BufferedImage.TYPE_3BYTE_BGR);
bi.getGraphics().drawChars(text.toCharArray(), 0, text.length(), 10,
20);
return bi;
}
private BufferedImage getImage2(String text) {
BufferedImage bi = new BufferedImage(200, 200,
BufferedImage.TYPE_INT_RGB);
bi.getGraphics().drawChars(text.toCharArray(), 0, text.length(), 10,
20);
return bi;
}
}
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