private static final LabelTypeDbm _instance = new LabelTypeDbm();

    private LabelTypeDbm() {
    }

    public static LabelTypeDbm getInstance() {
        return _instance;
    }

    // ===================================================================================
    //                                                                       Current DBDef

    //                                                                             =======
    @Override
    public DuplicateHostDbm asDBMeta() {
        return DuplicateHostDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "duplicate_host";
    }

    // ===================================================================================

    //                                                                             =======
    @Override
    public RelatedQueryDbm asDBMeta() {
        return RelatedQueryDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "related_query";
    }

    // ===================================================================================

    //                                                                             =======
    @Override
    public RequestHeaderDbm asDBMeta() {
        return RequestHeaderDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "request_header";
    }

    // ===================================================================================

    //                                                                             =======
    @Override
    public AccessTokenDbm asDBMeta() {
        return AccessTokenDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "access_token";
    }

    @Override
    public boolean hasSpecifiedColumn() {
        return _specification != null;
    }

    //                                                                             =======
    @Override
    public FailureUrlDbm asDBMeta() {
        return FailureUrlDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "failure_url";
    }

    @Override
    public boolean hasSpecifiedColumn() {
        return _specification != null;
    }

    //                                                                             =======
    @Override
    public RelatedContentDbm asDBMeta() {
        return RelatedContentDbm.getInstance();
    }

    @Override
    public String asTableDbName() {
        return "related_content";
    }

    @Override
    public boolean hasSpecifiedColumn() {
        return _specification != null;

        }
        for (int i = length; i < BLOCK_LENGTH; i++) {
            ipad[i] = IPAD;
            opad[i] = OPAD;
        }
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (final Exception ex) {
            throw new IllegalStateException(ex.getMessage());
        }
        engineReset();
    }

    private static final FailureUrlDbm _instance = new FailureUrlDbm();

    private FailureUrlDbm() {
    }

    public static FailureUrlDbm getInstance() {
        return _instance;
    }

    // ===================================================================================
    //                                                                       Current DBDef

    private static final WebAuthenticationDbm _instance = new WebAuthenticationDbm();

    private WebAuthenticationDbm() {
    }

    public static WebAuthenticationDbm getInstance() {
        return _instance;
    }

    // ===================================================================================
    //                                                                       Current DBDef