private void cleanupRoot(File dir) {
if (!dir.isDirectory()) {
return;
}
File[] children = dir.listFiles();
for (int i = 0; i < children.length; i++) {
File child = children[i];
if ((child != null) && child.isFile() && (m_access_cache.get(child.toString()) == null)) {
CUtils.LOGD(TAG, "delete: " + child);
child.delete();
}
}
}