public static Locale toLocale()

in src/main/java/org/apache/commons/lang3/LocaleUtils.java [296:334]
37 lines of code
13 McCabe index (conditional complexity)

    public static Locale toLocale(final String str) {
        if (str == null) {
            // TODO Should this return the default locale?
            return null;
        }
        if (str.isEmpty()) { // LANG-941 - JDK 8 introduced an empty locale where all fields are blank
            return new Locale(StringUtils.EMPTY, StringUtils.EMPTY);
        }
        if (str.contains("#")) { // LANG-879 - Cannot handle Java 7 script & extensions
            throw new IllegalArgumentException("Invalid locale format: " + str);
        }
        final int len = str.length();
        if (len < 2) {
            throw new IllegalArgumentException("Invalid locale format: " + str);
        }
        final char ch0 = str.charAt(0);
        if (ch0 == UNDERSCORE || ch0 == DASH) {
            if (len < 3) {
                throw new IllegalArgumentException("Invalid locale format: " + str);
            }
            final char ch1 = str.charAt(1);
            final char ch2 = str.charAt(2);
            if (!Character.isUpperCase(ch1) || !Character.isUpperCase(ch2)) {
                throw new IllegalArgumentException("Invalid locale format: " + str);
            }
            if (len == 3) {
                return new Locale(StringUtils.EMPTY, str.substring(1, 3));
            }
            if (len < 5) {
                throw new IllegalArgumentException("Invalid locale format: " + str);
            }
            if (str.charAt(3) != ch0) {
                throw new IllegalArgumentException("Invalid locale format: " + str);
            }
            return new Locale(StringUtils.EMPTY, str.substring(1, 3), str.substring(4));
        }

        return parseLocale(str);
    }