public static void setETag(URIConverter uriConverter, URI file, String eTag) {
try {
if (eTag != null) {
BaseUtil.writeFile(
uriConverter, null, file.appendFileExtension("etag"), eTag.getBytes("UTF-8"));
} else {
BaseUtil.deleteFile(uriConverter, null, file);
}
} catch (IORuntimeException ex) {
// If we can't write the ETag, perhaps some other process is writing it, but it's expected to
// write the same ETag value.
} catch (UnsupportedEncodingException ex) {
// All systems support UTF-8.
}
}
