public static String join()

in lang/src/main/java/org/apache/shiro/lang/util/StringUtils.java [456:489]

• 28 lines of code
• 9 McCabe index (conditional complexity)

    public static String join(Iterator<?> iterator, String separator) {
        final String empty = "";

        // handle null, zero and one elements before building a buffer
        if (iterator == null) {
            return null;
        }
        if (!iterator.hasNext()) {
            return empty;
        }
        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first == null ? empty : first.toString();
        }

        // two or more elements
        // Java default is 16, probably too small
        @SuppressWarnings("checkstyle:MagicNumber")
        StringBuilder buf = new StringBuilder(256);
        if (first != null) {
            buf.append(first);
        }

        while (iterator.hasNext()) {
            if (separator != null) {
                buf.append(separator);
            }
            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }
        return buf.toString();
    }