+ /** Delete empty parent directory up to the A2 target (included). */
+ void deleteEmptyParents(Path targetA2, Path targetParent) throws IOException {
+ if (!Files.isDirectory(targetParent))
+ throw new IllegalArgumentException(targetParent + " must be a directory");
+ boolean isA2target = Files.isSameFile(targetA2, targetParent);
+ if (!Files.list(targetParent).iterator().hasNext()) {
+ Files.delete(targetParent);
+ if (isA2target)
+ return;// stop after deleting A2 base
+ deleteEmptyParents(targetA2, targetParent.getParent());
+ }
+ }
+