@Override
    public List<ApplicationFile> listFiles(PathFilter filter) {
        Path userPath = getZKPath(path);
        List<ApplicationFile> ret = new ArrayList<>();
        for (String zkChild : zkApp.getChildren(userPath)) {
            Path childPath = path.append(zkChild);
            // Ignore dot-files.
            if (!childPath.getName().startsWith(".") && filter.accept(childPath)) {
                ret.add(new ZKApplicationFile(childPath, zkApp));
            }
        }
        return ret;
    }
@author Ulf Lilleengen
@author Vegard Havdal
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationFile.java