private void walkDir(File file, RelativePath path, FileVisitor visitor, Spec<FileTreeElement> spec, AtomicBoolean stopFlag) {
File[] children = file.listFiles();
if (children == null) {
if (file.isDirectory() && !file.canRead()) {
throw new GradleException(String.format("Could not list contents of directory '%s' as it is not readable.", file));
}
// else, might be a link which points to nothing, or has been removed while we're visiting, or ...
throw new GradleException(String.format("Could not list contents of '%s'.", file));
}
List<FileVisitDetails> dirs = new ArrayList<FileVisitDetails>();
for (int i = 0; !stopFlag.get() && i < children.length; i++) {
File child = children[i];
boolean isFile = child.isFile();