protected TokenizerFactory tokenizerFactory = null;

    /**
     * Default constructor.
     */
    public KatakanaConverter() {
        // nothing
    }

    /**
     * Constructor with a tokenizer factory.
     * @param tokenizerFactory The tokenizer factory to use.
     */
    public KatakanaConverter(final TokenizerFactory tokenizerFactory) {
        if (isEnableTokenizer(tokenizerFactory)) {

    }

    protected ReadingConverter createDefaultReadingConverter() throws IOException {
        ReadingConverterChain chain = new ReadingConverterChain();
        // chain.addConverter(new KatakanaConverter());
        chain.addConverter(new KatakanaToAlphabetConverter());
        chain.init();
        return chain;
    }

    protected Normalizer createDefaultNormalizer() {
        // TODO