List<File> result = new ArrayList<File>();
        Queue<File> directories = new LinkedList<File>();
        directories.add(directory);

        while (!directories.isEmpty())
        {
            File currentDirectory = directories.remove();
            for (File f: currentDirectory.listFiles(filter)) {
                if (f.isDirectory()) {
                    if (isRecursive) directories.add(f);
                } else {
                    result.add(f);
                }
            }
        }