Class MacAddressUtil

java.lang.Object
io.netty.util.internal.MacAddressUtil
public final class MacAddressUtil extends java.lang.Object

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    private static final int
    EUI48_MAC_ADDRESS_LENGTH
     
    private static final int
    EUI64_MAC_ADDRESS_LENGTH
     
    private static final InternalLogger
    logger
     

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    private
    MacAddressUtil()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static byte[]
    bestAvailableMac()
    Obtains the best MAC address found on local network interfaces.
    (package private) static int
    compareAddresses(byte[] current, byte[] candidate)
     
    private static int
    compareAddresses(java.net.InetAddress current, java.net.InetAddress candidate)
     
    static byte[]
    defaultMachineId()
    Returns the result of bestAvailableMac() if non-null otherwise returns a random EUI-64 MAC address.
    static java.lang.String
    formatAddress(byte[] addr)
     
    static byte[]
    parseMAC(java.lang.String value)
    Parse a EUI-48, MAC-48, or EUI-64 MAC address from a String and return it as a byte[].
    private static int
    scoreAddress(java.net.InetAddress addr)
     
    private static void
    validateMacSeparator(char separator)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

    • MacAddressUtil

      private MacAddressUtil()

  • Method Details

    • bestAvailableMac

      public static byte[] bestAvailableMac()
      Obtains the best MAC address found on local network interfaces. Generally speaking, an active network interface used on public networks is better than a local network interface.
      Returns:
      byte array containing a MAC. null if no MAC can be found.

    • defaultMachineId

      public static byte[] defaultMachineId()
      Returns the result of bestAvailableMac() if non-null otherwise returns a random EUI-64 MAC address.

    • parseMAC

      public static byte[] parseMAC(java.lang.String value)
      Parse a EUI-48, MAC-48, or EUI-64 MAC address from a String and return it as a byte[].
      Parameters:
      value - The string representation of the MAC address.
      Returns:
      The byte representation of the MAC address.

    • validateMacSeparator

      private static void validateMacSeparator(char separator)

    • formatAddress

      public static java.lang.String formatAddress(byte[] addr)
      Parameters:
      addr - byte array of a MAC address.
      Returns:
      hex formatted MAC address.

    • compareAddresses

      static int compareAddresses(byte[] current, byte[] candidate)
      Returns:
      positive - current is better, 0 - cannot tell from MAC addr, negative - candidate is better.

    • compareAddresses

      private static int compareAddresses(java.net.InetAddress current, java.net.InetAddress candidate)
      Returns:
      positive - current is better, 0 - cannot tell, negative - candidate is better

    • scoreAddress

      private static int scoreAddress(java.net.InetAddress addr)