@Override public String[] list(String path) { checkState(); // Set because we don't want duplicates HashSet<String> result = new HashSet<>(); for (ArrayList<WebResourceSet> list : allResources) { for (WebResourceSet webResourceSet : list) { String[] entries = webResourceSet.list(path); for (String entry : entries) { result.add(entry); } } } return result.toArray(new String[result.size()]); }