*/
  private void aboutToAcquire(CycleDetectingLock lock) {
    if (!lock.isAcquiredByCurrentThread()) {
      // requireNonNull accommodates Android's @RecentlyNullable annotation on ThreadLocal.get
      ArrayList<LockGraphNode> acquiredLockList = requireNonNull(acquiredLocks.get());
      LockGraphNode node = lock.getLockGraphNode();
      node.checkAcquiredLocks(policy, acquiredLockList);

  public static String toAddrString(InetAddress ip) {
    checkNotNull(ip);
    if (ip instanceof Inet4Address) {
      // For IPv4, Java's formatting is good enough.
      // requireNonNull accommodates Android's @RecentlyNullable annotation on getHostAddress
      return requireNonNull(ip.getHostAddress());
    }
    byte[] bytes = ip.getAddress();
    int[] hextets = new int[IPV6_PART_COUNT];
    for (int i = 0; i < hextets.length; i++) {

  public static String toAddrString(InetAddress ip) {
    checkNotNull(ip);
    if (ip instanceof Inet4Address) {
      // For IPv4, Java's formatting is good enough.
      // requireNonNull accommodates Android's @RecentlyNullable annotation on getHostAddress
      return requireNonNull(ip.getHostAddress());
    }
    byte[] bytes = ip.getAddress();
    int[] hextets = new int[IPV6_PART_COUNT];
    for (int i = 0; i < hextets.length; i++) {