public List<Object> extractDBRefValue(DBRefBase ref, String refKey) {
if ("$id".equals(refKey)) {
return Collections.singletonList(ref.getId());
} else if ("$ref".equals(refKey)) {
return Collections.<Object>singletonList(ref.getRef());
} else if ("$db".equals(refKey)) {
return Collections.<Object>singletonList(ref.getDB());
} else return Collections.emptyList();
}
protected void putDBRef(String name, DBRefBase ref) {
_put(OBJECT, name);
final int sizePos = _buf.getPosition();
_buf.writeInt(0);
_putObjectField("$ref", ref.getRef());
_putObjectField("$id", ref.getId());
_buf.write(EOO);
_buf.writeInt(sizePos, _buf.getPosition() - sizePos);
}