private static String readFile(String path) {
        api = new BoxAPIConnection(DEVELOPER_TOKEN);
        BoxFolder root = changeDirectory(path);
        String[] folders = path.split("/");
        BoxFile res = searchFile(root, folders[folders.length - 1]);
        ByteOutputStream out = new ByteOutputStream();
        res.download(out);
        String contain = out.toString();
        return contain;
    }
    private static BoxFolder changeDirectory(String path) {
        BoxFolder root = BoxFolder.getRootFolder(api);
        String[] folders = path.split("/");
        for (String folder : folders) {
            if (folder.length() == 0) {
                continue;
            }
            Iterable<BoxItem.Info> res = root.search(folder);
            for (BoxItem.Info info : res) {
                if (info instanceof BoxFolder.Info && info.getName().equals(folder)) {
                    root = new BoxFolder(api, info.getID());
                    break;
                }
            }
        }
        return root;
    }
    private static BoxFile searchFile(BoxFolder currentDirectory, String name) {
        BoxFile res = null;
        for (BoxItem.Info info : currentDirectory) {
            if (info instanceof BoxFile.Info && info.getName().equals(name)) {
                res = (BoxFile)info.getResource();
                break;
            }
        }
        return res;
    }
    private static void writeFile(String path, String file) {
        api = new BoxAPIConnection(DEVELOPER_TOKEN);
        BoxFolder root = changeDirectory(path);
        String[] folders = path.split("/");
        byte[] bytes = file.getBytes();
        ByteInputStream uploadStream = new ByteInputStream(bytes, bytes.length);
        BoxFile fileThatNeedsToUpload = searchFile(root, folders[folders.length - 1]);
        if (fileThatNeedsToUpload == null) {
            root.uploadFile(uploadStream, folders[folders.length - 1]);
        } else {
            removeFile(path);
            writeFile(path, file);
        }
    }
    private static void removeFile(String path) {
        api = new BoxAPIConnection(DEVELOPER_TOKEN);
        BoxFolder root = changeDirectory(path);
        String[] folders = path.split("/");
        BoxFile fileThatNeedsToRemove = searchFile(root, folders[folders.length - 1]);
        if (fileThatNeedsToRemove != null) {
            fileThatNeedsToRemove.delete();
        }
    }