IsValidIpV6Benchmark Class — netty Architecture

Source Code

microbench/src/main/java/io/netty/microbenchmark/common/IsValidIpV6Benchmark.java lines 29–219

@Threads(1)
@Warmup(iterations = 3)
@Measurement(iterations = 3)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class IsValidIpV6Benchmark extends AbstractMicrobenchmark {

    @Param({
            "127.0.0.1", "fdf8:f53b:82e4::53", "2001::1",
            "2001:0000:4136:e378:8000:63bf:3fff:fdd2", "0:0:0:0:0:0:10.0.0.1"
    })
    private String ip;

    private static boolean isValidIp4Word(String word) {
        char c;
        if (word.length() < 1 || word.length() > 3) {
            return false;
        }
        for (int i = 0; i < word.length(); i++) {
            c = word.charAt(i);
            if (!(c >= '0' && c <= '9')) {
                return false;
            }
        }
        return Integer.parseInt(word) <= 255;
    }

    private static boolean isValidHexChar(char c) {
        return c >= '0' && c <= '9' || c >= 'A' && c <= 'F' || c >= 'a' && c <= 'f';
    }

    private static boolean isValidIPv4MappedChar(char c) {
        return c == 'f' || c == 'F';
    }

    public static boolean isValidIpV6AddressOld(String ipAddress) {
        boolean doubleColon = false;
        int numberOfColons = 0;
        int numberOfPeriods = 0;
        StringBuilder word = new StringBuilder();
        char c = 0;
        char prevChar;
        int startOffset = 0; // offset for [] ip addresses
        int endOffset = ipAddress.length();

        if (endOffset < 2) {
            return false;
        }

        // Strip []
        if (ipAddress.charAt(0) == '[') {
            if (ipAddress.charAt(endOffset - 1) != ']') {
                return false; // must have a close ]
            }

            startOffset = 1;
            endOffset--;
        }

        // Strip the interface name/index after the percent sign.
        int percentIdx = ipAddress.indexOf('%', startOffset);
        if (percentIdx >= 0) {
            endOffset = percentIdx;
        }

        for (int i = startOffset; i < endOffset; i++) {
            prevChar = c;
            c = ipAddress.charAt(i);
            switch (c) {
            // case for the last 32-bits represented as IPv4 x:x:x:x:x:x:d.d.d.d
            case '.':
                numberOfPeriods++;
                if (numberOfPeriods > 3) {
                    return false;
                }
                if (numberOfPeriods == 1) {
                    // Verify this address is of the correct structure to contain an IPv4 address.
                    // It must be IPv4-Mapped or IPv4-Compatible
                    // (see https://tools.ietf.org/html/rfc4291#section-2.5.5).
                    int j = i - word.length() - 2; // index of character before the previous ':'.
                    final int beginColonIndex = ipAddress.lastIndexOf(':', j);
                    if (beginColonIndex == -1) {