public static String toUnicodeString()

in geronimo-mail_2.1_spec/src/main/java/jakarta/mail/internet/InternetAddress.java [601:664]
50 lines of code
13 McCabe index (conditional complexity)

    public static String toUnicodeString(Address[] addresses, int used) {

        if (addresses == null || addresses.length == 0) {
            return null;
        }

        boolean sawNonAsciiCharacters = false;

        if (addresses.length == 1) {

            String converted = ((InternetAddress)addresses[0]).toUnicodeString();
            if (MimeUtility.verifyAscii(converted) != MimeUtility.ALL_ASCII){
                sawNonAsciiCharacters = true;
                converted = new String(converted.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);

            }

            if (used + converted.length() > 72) {
                converted = "\r\n  " + converted;
            }

            if(sawNonAsciiCharacters){
                return new String(converted.getBytes(StandardCharsets.ISO_8859_1),StandardCharsets.UTF_8);
            }

            return converted;
        } else {
            final StringBuffer buf = new StringBuffer(addresses.length * 32);
            for (int i = 0; i < addresses.length; i++) {

                String converted = ((InternetAddress)addresses[0]).toUnicodeString();

                if (MimeUtility.verifyAscii(converted) != MimeUtility.ALL_ASCII){
                    sawNonAsciiCharacters = true;
                    converted = new String(converted.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);

                }

                if (i == 0) {
                    if (used + converted.length() + 1 > 72) {
                        buf.append("\r\n  ");
                        used = 2;
                    }
                } else {
                    if (used + converted.length() + 1 > 72) {
                        buf.append(",\r\n  ");
                        used = 2;
                    } else {
                        buf.append(", ");
                        used += 2;
                    }
                }
                buf.append(converted);
                used += converted.length();
            }

            String finalString = buf.toString();

            if(sawNonAsciiCharacters){
                return new String(finalString.getBytes(StandardCharsets.ISO_8859_1),StandardCharsets.UTF_8);
            }
            return finalString;
        }
    }