static Locale toLocale()

in src/main/java/org/apache/sling/i18n/impl/JcrResourceBundleProvider.java [669:727]
45 lines of code
13 McCabe index (conditional complexity)

    static Locale toLocale(String localeString) {
        if (localeString == null || localeString.length() == 0) {
            return Locale.getDefault();
        }
        // support BCP 47 compliant strings as well (using a different separator "-" instead of "_")
        localeString = localeString.replaceAll("-", "_");

        // check language and country
        final String[] parts = localeString.split("_");
        if (parts.length == 0) {
            return Locale.getDefault();
        }

        // at least language is available
        String lang = parts[0];
        boolean isValidLanguageCode = false;
        String[] langs = Locale.getISOLanguages();
        for (int i = 0; i < langs.length; i++) {
            if (langs[i].equalsIgnoreCase(lang)) {
                isValidLanguageCode = true;
                break;
            }
        }
        if (!isValidLanguageCode) {
            lang = Locale.getDefault().getLanguage();
        }

        // only language
        if (parts.length == 1) {
            return new Locale(lang);
        }

        // country is also available
        String country = parts[1];
        boolean isValidCountryCode = false;
        // allow user-assigned codes (https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#User-assigned_code_elements)
        if (USER_ASSIGNED_COUNTRY_CODES_PATTERN.matcher(country.toLowerCase()).matches()) {
            isValidCountryCode = true;
        } else {
            String[] countries = Locale.getISOCountries();
            for (int i = 0; i < countries.length; i++) {
                if (countries[i].equalsIgnoreCase(country)) {
                    isValidCountryCode = true; // signal ok
                    break;
                }
            }
        }
        if (!isValidCountryCode) {
            country = Locale.getDefault().getCountry();
        }

        // language and country
        if (parts.length == 2) {
            return new Locale(lang, country);
        }

        // language, country and variant
        return new Locale(lang, country, parts[2]);
    }