code: @NotNull
    public static Map<String, String> createPointer(@NotNull String oid, long size) {
      final Map<String, String> pointer = new TreeMap<>();
      pointer.put(VERSION, VERSION_URL);
      pointer.put(OID, oid);
      pointer.put(SIZE, Long.toString(size));
      return pointer;
    }
docs: Create pointer with oid and size.
  
  @param oid  Object oid.
  @param size Object size.
  @return Return pointer data.