final String prefix = protocol + ":";
        if (stream(fileProtocols).get(stream -> stream.anyMatch(s -> s.equals(prefix)))) {
            logger.debug("file protocols contains {}.", protocol);
            return;
        }
        fileProtocols = Arrays.copyOf(fileProtocols, fileProtocols.length + 1);
        fileProtocols[fileProtocols.length - 1] = prefix;
    }