public static final IonType getNullType()

in src/com/amazon/ion/impl/IonTokenConstsX.java [858:949]
90 lines of code
40 McCabe index (conditional complexity)

    public static final IonType getNullType(CharSequence s)
    {
        IonType type = null;
        int     c, ii = 0;
        boolean stop = false;
        while (!stop && ii<s.length()) {
            c = s.charAt(ii++);
            switch (c) {
            case ' ': case '\t': case '\r': case '\n':
                break;
            case 'n':
                stop = true;
                break;
            default:
                invalid_null_image(s);
            }
        }
        if (ii>=s.length() || s.charAt(ii++) != 'u') invalid_null_image(s);
        if (ii>=s.length() || s.charAt(ii++) != 'l') invalid_null_image(s);
        if (ii>=s.length() || s.charAt(ii++) != 'l') invalid_null_image(s);
        boolean dot = false;
        while (!dot && ii<s.length()) {
            c = s.charAt(ii++);
            switch (c) {
            case ' ': case '\t': case '\r': case '\n':
                break;
            case '.':
                dot = true;
                break;
            default:
                invalid_null_image(s);
            }
        }
        if (dot) {
            int kw = IonTokenConstsX.keyword(s, ii, s.length());
            switch (kw) {
                case IonTokenConstsX.KEYWORD_NULL:
                    type = IonType.NULL;
                    break;
                case IonTokenConstsX.KEYWORD_BOOL:
                    type = IonType.BOOL;
                    break;
                case IonTokenConstsX.KEYWORD_INT:
                    type = IonType.INT;
                    break;
                case IonTokenConstsX.KEYWORD_FLOAT:
                    type = IonType.FLOAT;
                    break;
                case IonTokenConstsX.KEYWORD_DECIMAL:
                    type = IonType.DECIMAL;
                    break;
                case IonTokenConstsX.KEYWORD_TIMESTAMP:
                    type = IonType.TIMESTAMP;
                    break;
                case IonTokenConstsX.KEYWORD_SYMBOL:
                    type = IonType.SYMBOL;
                    break;
                case IonTokenConstsX.KEYWORD_STRING:
                    type = IonType.STRING;
                    break;
                case IonTokenConstsX.KEYWORD_CLOB:
                    type = IonType.CLOB;
                    break;
                case IonTokenConstsX.KEYWORD_BLOB:
                    type = IonType.BLOB;
                    break;
                case IonTokenConstsX.KEYWORD_STRUCT:
                    type = IonType.STRUCT;
                    break;
                case IonTokenConstsX.KEYWORD_LIST:
                    type = IonType.LIST;
                    break;
                case IonTokenConstsX.KEYWORD_SEXP:
                    type = IonType.SEXP;
                    break;
                default:
                    invalid_null_image(s);
            }
        }

        while (ii<s.length()) {
            c = s.charAt(ii++);
            switch (c) {
            case ' ': case '\t': case '\r': case '\n':
                break;
            default:
                invalid_null_image(s);
            }
        }

        return type;
    }