/** Copies a given XML file, and appends a given comment to the end */
private static void copyXmlWithComment(
@NonNull File from, @NonNull File to, @Nullable String comment) throws IOException {
int successfulOps = 0;
InputStream in = new FileInputStream(from);
try {
FileOutputStream out = new FileOutputStream(to, false);
try {
ByteStreams.copy(in, out);
successfulOps++;
if (comment != null) {
String commentText = "<!-- " + XmlUtils.toXmlTextValue(comment) + " -->";
byte[] suffix = commentText.getBytes(Charsets.UTF_8);
out.write(suffix);
}
} finally {
Closeables.close(out, successfulOps < 1);
successfulOps++;
}
} finally {
Closeables.close(in, successfulOps < 2);
}
}
