private static String getIPv6UrlRepresentation()

in fluss-common/src/main/java/com/alibaba/fluss/utils/NetUtils.java [116:166]
45 lines of code
14 McCabe index (conditional complexity)

    private static String getIPv6UrlRepresentation(byte[] addressBytes) {
        // first, convert bytes to 16 bit chunks
        int[] hextets = new int[8];
        for (int i = 0; i < hextets.length; i++) {
            hextets[i] = (addressBytes[2 * i] & 0xFF) << 8 | (addressBytes[2 * i + 1] & 0xFF);
        }

        // now, find the sequence of zeros that should be compressed
        int bestRunStart = -1;
        int bestRunLength = -1;
        int runStart = -1;
        for (int i = 0; i < hextets.length + 1; i++) {
            if (i < hextets.length && hextets[i] == 0) {
                if (runStart < 0) {
                    runStart = i;
                }
            } else if (runStart >= 0) {
                int runLength = i - runStart;
                if (runLength > bestRunLength) {
                    bestRunStart = runStart;
                    bestRunLength = runLength;
                }
                runStart = -1;
            }
        }
        if (bestRunLength >= 2) {
            Arrays.fill(hextets, bestRunStart, bestRunStart + bestRunLength, -1);
        }

        // convert into text form
        StringBuilder buf = new StringBuilder(40);
        buf.append('[');

        boolean lastWasNumber = false;
        for (int i = 0; i < hextets.length; i++) {
            boolean thisIsNumber = hextets[i] >= 0;
            if (thisIsNumber) {
                if (lastWasNumber) {
                    buf.append(':');
                }
                buf.append(Integer.toHexString(hextets[i]));
            } else {
                if (i == 0 || lastWasNumber) {
                    buf.append("::");
                }
            }
            lastWasNumber = thisIsNumber;
        }
        buf.append(']');
        return buf.toString();
    }