Saving drag and drop StreamResource to BufferedImage

I have following code for my drag and drop:
@Override
public void streamingFinished(final StreamingEndEvent event) {
    StreamResource resource = showFile(fileName, html5File.getType(), bas);    
    image.setVisible(true);
    image.setSource(resource);
}

private StreamResource showFile(final String name, final String type, final ByteArrayOutputStream bas) {
// resource for serving the file contents
    final StreamSource streamSource = new StreamSource() {
        @Override
        public InputStream getStream() {
            if (bas != null) {
                final byte[] byteArray = bas.toByteArray();
                return new ByteArrayInputStream(byteArray);
            }
            return null;
        }
    };
    final StreamResource resource = new StreamResource(streamSource, name);    
    return resource ;
}

image is a Vaadin embedded Image but I scale my pictures with the Scalr library and that only works with BufferedImage. Is there any way I can save this StreamResource to something else than a Vaadin Image? Like a file or something so I can load it as BufferedImage