org.apache.commons.net.ntp

## Class NtpV3Impl

- java.lang.Object
- - org.apache.commons.net.ntp.NtpV3Impl

- All Implemented Interfaces:
    NtpV3Packet

      public class NtpV3Impl
      extends Object
      implements NtpV3Packet

  Implementation of NtpV3Packet with methods converting Java objects to/from the Network Time Protocol (NTP) data message header format described in RFC-1305.

- - ### Field Summary

    - ### Fields inherited from interface org.apache.commons.net.ntp.NtpV3Packet

      `LI_ALARM_CONDITION, LI_LAST_MINUTE_HAS_59_SECONDS, LI_LAST_MINUTE_HAS_61_SECONDS, LI_NO_WARNING, MODE_BROADCAST, MODE_CLIENT, MODE_CONTROL_MESSAGE, MODE_PRIVATE, MODE_RESERVED, MODE_SERVER, MODE_SYMMETRIC_ACTIVE, MODE_SYMMETRIC_PASSIVE, NTP_MAXCLOCK, NTP_MAXPOLL, NTP_MINCLOCK, NTP_MINPOLL, NTP_PORT, TYPE_DAYTIME, TYPE_ICMP, TYPE_NTP, TYPE_TIME, VERSION_3, VERSION_4`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `NtpV3Impl()` Creates a new instance of NtpV3Impl

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `equals(Object obj)` Compares this object against the specified object.
    `DatagramPacket` | `getDatagramPacket()` Returns the datagram packet with the NTP details already filled in.
    `int` | `getLeapIndicator()` Returns leap indicator as defined in RFC-1305 which is a two-bit code: 0=no warning 1=last minute has 61 seconds 2=last minute has 59 seconds 3=alarm condition (clock not synchronized)
    `int` | `getMode()` Returns mode as defined in RFC-1305 which is a 3-bit integer whose value is indicated by the MODE_xxx parameters.
    `String` | `getModeName()` Return human-readable name of message mode type as described in RFC 1305.
    `TimeStamp` | `getOriginateTimeStamp()` Returns the originate time as defined in RFC-1305.
    `int` | `getPoll()` Returns poll interval as defined in RFC-1305, which is an eight-bit signed integer indicating the maximum interval between successive messages, in seconds to the nearest power of two (e.g.
    `int` | `getPrecision()` Returns precision as defined in RFC-1305 encoded as an 8-bit signed integer (seconds to nearest power of two).
    `TimeStamp` | `getReceiveTimeStamp()` Returns receive timestamp as defined in RFC-1305.
    `int` | `getReferenceId()` Returns the reference id as defined in RFC-1305, which is a 32-bit integer whose value is dependent on several criteria.
    `String` | `getReferenceIdString()` Returns the reference id string.
    `TimeStamp` | `getReferenceTimeStamp()` Returns the reference time as defined in RFC-1305.
    `int` | `getRootDelay()` Return root delay as defined in RFC-1305, which is the total roundtrip delay to the primary reference source, in seconds.
    `double` | `getRootDelayInMillisDouble()` Return root delay as defined in RFC-1305 in milliseconds, which is the total roundtrip delay to the primary reference source, in seconds.
    `int` | `getRootDispersion()` Returns root dispersion as defined in RFC-1305.
    `long` | `getRootDispersionInMillis()` Returns root dispersion (as defined in RFC-1305) in milliseconds.
    `double` | `getRootDispersionInMillisDouble()` Returns root dispersion (as defined in RFC-1305) in milliseconds as double precision value.
    `int` | `getStratum()` Returns Stratum as defined in RFC-1305, which indicates the stratum level of the local clock, with values defined as follows: 0=unspecified, 1=primary ref clock, and all others a secondary reference (via NTP).
    `TimeStamp` | `getTransmitTimeStamp()` Returns the transmit timestamp as defined in RFC-1305.
    `String` | `getType()` Return type of time packet.
    `int` | `getVersion()` Returns NTP version number as defined in RFC-1305.
    `int` | `hashCode()` Computes a hashcode for this object.
    `void` | `setDatagramPacket(DatagramPacket srcDp)` Set the contents of this object from source datagram packet.
    `void` | `setLeapIndicator(int li)` Set leap indicator as defined in RFC-1305.
    `void` | `setMode(int mode)` Set mode as defined in RFC-1305.
    `void` | `setOriginateTimeStamp(TimeStamp ts)` Set originate timestamp given NTP TimeStamp object.
    `void` | `setPoll(int poll)` Set poll interval as defined in RFC-1305.
    `void` | `setPrecision(int precision)` Set precision as defined in RFC-1305.
    `void` | `setReceiveTimeStamp(TimeStamp ts)` Set receive timestamp given NTP TimeStamp object.
    `void` | `setReferenceId(int refId)` Set reference clock identifier field with 32-bit unsigned integer value.
    `void` | `setReferenceTime(TimeStamp ts)` Set Reference time with NTP timestamp.
    `void` | `setRootDelay(int delay)` Set root delay as defined in RFC-1305.
    `void` | `setRootDispersion(int dispersion)` Set root dispersion as defined in RFC-1305.
    `void` | `setStratum(int stratum)` Set stratum level as defined in RFC-1305.
    `void` | `setTransmitTime(TimeStamp ts)` Set transmit time with NTP timestamp.
    `void` | `setVersion(int version)` Set NTP version as defined in RFC-1305.
    `String` | `toString()` Returns details of NTP packet as a string.
    `protected static int` | `ui(byte b)` Convert byte to unsigned integer.
    `protected static long` | `ul(byte b)` Convert byte to unsigned long.

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### NtpV3Impl

          public NtpV3Impl()

      Creates a new instance of NtpV3Impl

  - ### Method Detail

    - #### getMode

          public int getMode()

      Returns mode as defined in RFC-1305 which is a 3-bit integer whose value is indicated by the MODE_xxx parameters.
      Specified by:
        `getMode` in interface `NtpV3Packet`
      Returns:
        mode as defined in RFC-1305.

    - #### getModeName

          public String getModeName()

      Return human-readable name of message mode type as described in RFC 1305.
      Specified by:
        `getModeName` in interface `NtpV3Packet`
      Returns:
        mode name as string.

    - #### setMode

          public void setMode(int mode)

      Set mode as defined in RFC-1305.
      Specified by:
        `setMode` in interface `NtpV3Packet`
      Parameters:
        `mode` - the mode to set

    - #### getLeapIndicator

          public int getLeapIndicator()

      Returns leap indicator as defined in RFC-1305 which is a two-bit code: 0=no warning 1=last minute has 61 seconds 2=last minute has 59 seconds 3=alarm condition (clock not synchronized)
      Specified by:
        `getLeapIndicator` in interface `NtpV3Packet`
      Returns:
        leap indicator as defined in RFC-1305.

    - #### setLeapIndicator

          public void setLeapIndicator(int li)

      Set leap indicator as defined in RFC-1305.
      Specified by:
        `setLeapIndicator` in interface `NtpV3Packet`
      Parameters:
        `li` - leap indicator.

    - #### getPoll

          public int getPoll()

      Returns poll interval as defined in RFC-1305, which is an eight-bit signed integer indicating the maximum interval between successive messages, in seconds to the nearest power of two (e.g. value of six indicates an interval of 64 seconds. The values that can appear in this field range from NTP_MINPOLL to NTP_MAXPOLL inclusive.
      Specified by:
        `getPoll` in interface `NtpV3Packet`
      Returns:
        poll interval as defined in RFC-1305.

    - #### setPoll

          public void setPoll(int poll)

      Set poll interval as defined in RFC-1305.
      Specified by:
        `setPoll` in interface `NtpV3Packet`
      Parameters:
        `poll` - poll interval.

    - #### getPrecision

          public int getPrecision()

      Returns precision as defined in RFC-1305 encoded as an 8-bit signed integer (seconds to nearest power of two). Values normally range from -6 to -20.
      Specified by:
        `getPrecision` in interface `NtpV3Packet`
      Returns:
        precision as defined in RFC-1305.

    - #### setPrecision

          public void setPrecision(int precision)

      Set precision as defined in RFC-1305.
      Specified by:
        `setPrecision` in interface `NtpV3Packet`
      Parameters:
        `precision` - the precision to set
      Since:
        3.4

    - #### getVersion

          public int getVersion()

      Returns NTP version number as defined in RFC-1305.
      Specified by:
        `getVersion` in interface `NtpV3Packet`
      Returns:
        NTP version number.

    - #### setVersion

          public void setVersion(int version)

      Set NTP version as defined in RFC-1305.
      Specified by:
        `setVersion` in interface `NtpV3Packet`
      Parameters:
        `version` - NTP version.

    - #### getStratum

          public int getStratum()

      Returns Stratum as defined in RFC-1305, which indicates the stratum level of the local clock, with values defined as follows: 0=unspecified, 1=primary ref clock, and all others a secondary reference (via NTP).
      Specified by:
        `getStratum` in interface `NtpV3Packet`
      Returns:
        Stratum level as defined in RFC-1305.

    - #### setStratum

          public void setStratum(int stratum)

      Set stratum level as defined in RFC-1305.
      Specified by:
        `setStratum` in interface `NtpV3Packet`
      Parameters:
        `stratum` - stratum level.

    - #### getRootDelay

          public int getRootDelay()

      Return root delay as defined in RFC-1305, which is the total roundtrip delay to the primary reference source, in seconds. Values can take positive and negative values, depending on clock precision and skew.
      Specified by:
        `getRootDelay` in interface `NtpV3Packet`
      Returns:
        root delay as defined in RFC-1305.

    - #### setRootDelay

          public void setRootDelay(int delay)

      Set root delay as defined in RFC-1305.
      Specified by:
        `setRootDelay` in interface `NtpV3Packet`
      Parameters:
        `delay` - root delay
      Since:
        3.4

    - #### getRootDelayInMillisDouble

          public double getRootDelayInMillisDouble()

      Return root delay as defined in RFC-1305 in milliseconds, which is the total roundtrip delay to the primary reference source, in seconds. Values can take positive and negative values, depending on clock precision and skew.
      Specified by:
        `getRootDelayInMillisDouble` in interface `NtpV3Packet`
      Returns:
        root delay in milliseconds

    - #### getRootDispersion

          public int getRootDispersion()

      Returns root dispersion as defined in RFC-1305.
      Specified by:
        `getRootDispersion` in interface `NtpV3Packet`
      Returns:
        root dispersion.

    - #### setRootDispersion

          public void setRootDispersion(int dispersion)

      Set root dispersion as defined in RFC-1305.
      Specified by:
        `setRootDispersion` in interface `NtpV3Packet`
      Parameters:
        `dispersion` - root dispersion
      Since:
        3.4

    - #### getRootDispersionInMillis

          public long getRootDispersionInMillis()

      Returns root dispersion (as defined in RFC-1305) in milliseconds.
      Specified by:
        `getRootDispersionInMillis` in interface `NtpV3Packet`
      Returns:
        root dispersion in milliseconds

    - #### getRootDispersionInMillisDouble

          public double getRootDispersionInMillisDouble()

      Returns root dispersion (as defined in RFC-1305) in milliseconds as double precision value.
      Specified by:
        `getRootDispersionInMillisDouble` in interface `NtpV3Packet`
      Returns:
        root dispersion in milliseconds

    - #### setReferenceId

          public void setReferenceId(int refId)

      Set reference clock identifier field with 32-bit unsigned integer value. See RFC-1305 for description.
      Specified by:
        `setReferenceId` in interface `NtpV3Packet`
      Parameters:
        `refId` - reference clock identifier.

    - #### getReferenceId

          public int getReferenceId()

      Returns the reference id as defined in RFC-1305, which is a 32-bit integer whose value is dependent on several criteria.
      Specified by:
        `getReferenceId` in interface `NtpV3Packet`
      Returns:
        the reference id as defined in RFC-1305.

    - #### getReferenceIdString

          public String getReferenceIdString()

      Returns the reference id string. String cannot be null but value is dependent on the version of the NTP spec supported and stratum level. Value can be an empty string, clock type string, IP address, or a hex string.
      Specified by:
        `getReferenceIdString` in interface `NtpV3Packet`
      Returns:
        the reference id string.

    - #### getTransmitTimeStamp

          public TimeStamp getTransmitTimeStamp()

      Returns the transmit timestamp as defined in RFC-1305.
      Specified by:
        `getTransmitTimeStamp` in interface `NtpV3Packet`
      Returns:
        the transmit timestamp as defined in RFC-1305. Never returns a null object.

    - #### setTransmitTime

          public void setTransmitTime(TimeStamp ts)

      Set transmit time with NTP timestamp. If `ts` is null then zero time is used.
      Specified by:
        `setTransmitTime` in interface `NtpV3Packet`
      Parameters:
        `ts` - NTP timestamp

    - #### setOriginateTimeStamp

          public void setOriginateTimeStamp(TimeStamp ts)

      Set originate timestamp given NTP TimeStamp object. If `ts` is null then zero time is used.
      Specified by:
        `setOriginateTimeStamp` in interface `NtpV3Packet`
      Parameters:
        `ts` - NTP timestamp

    - #### getOriginateTimeStamp

          public TimeStamp getOriginateTimeStamp()

      Returns the originate time as defined in RFC-1305.
      Specified by:
        `getOriginateTimeStamp` in interface `NtpV3Packet`
      Returns:
        the originate time. Never returns null.

    - #### getReferenceTimeStamp

          public TimeStamp getReferenceTimeStamp()

      Returns the reference time as defined in RFC-1305.
      Specified by:
        `getReferenceTimeStamp` in interface `NtpV3Packet`
      Returns:
        the reference time as `TimeStamp` object. Never returns null.

    - #### setReferenceTime

          public void setReferenceTime(TimeStamp ts)

      Set Reference time with NTP timestamp. If `ts` is null then zero time is used.
      Specified by:
        `setReferenceTime` in interface `NtpV3Packet`
      Parameters:
        `ts` - NTP timestamp

    - #### getReceiveTimeStamp

          public TimeStamp getReceiveTimeStamp()

      Returns receive timestamp as defined in RFC-1305.
      Specified by:
        `getReceiveTimeStamp` in interface `NtpV3Packet`
      Returns:
        the receive time. Never returns null.

    - #### setReceiveTimeStamp

          public void setReceiveTimeStamp(TimeStamp ts)

      Set receive timestamp given NTP TimeStamp object. If `ts` is null then zero time is used.
      Specified by:
        `setReceiveTimeStamp` in interface `NtpV3Packet`
      Parameters:
        `ts` - timestamp

    - #### getType

          public String getType()

      Return type of time packet. The values (e.g. NTP, TIME, ICMP, ...) correspond to the protocol used to obtain the timing information.
      Specified by:
        `getType` in interface `NtpV3Packet`
      Returns:
        packet type string identifier which in this case is "NTP".

    - #### getDatagramPacket

          public DatagramPacket getDatagramPacket()

      Returns the datagram packet with the NTP details already filled in.
      Specified by:
        `getDatagramPacket` in interface `NtpV3Packet`
      Returns:
        a datagram packet.

    - #### setDatagramPacket

          public void setDatagramPacket(DatagramPacket srcDp)

      Set the contents of this object from source datagram packet.
      Specified by:
        `setDatagramPacket` in interface `NtpV3Packet`
      Parameters:
        `srcDp` - source DatagramPacket to copy contents from, never null.
      Throws:
        `IllegalArgumentException` - if srcDp is null or byte length is less than minimum length of 48 bytes

    - #### equals

          public boolean equals(Object obj)

      Compares this object against the specified object. The result is `true` if and only if the argument is not `null` and is a `NtpV3Impl` object that contains the same values as this object.
      Overrides:
        `equals` in class `Object`
      Parameters:
        `obj` - the object to compare with.
      Returns:
        `true` if the objects are the same; `false` otherwise.
      Since:
        3.4

    - #### hashCode

          public int hashCode()

      Computes a hashcode for this object. The result is the exclusive OR of the values of this object stored as a byte array.
      Overrides:
        `hashCode` in class `Object`
      Returns:
        a hash code value for this object.
      Since:
        3.4

    - #### ui

          protected static final int ui(byte b)

      Convert byte to unsigned integer. Java only has signed types so we have to do more work to get unsigned ops.
      Parameters:
        `b` - input byte
      Returns:
        unsigned int value of byte

    - #### ul

          protected static final long ul(byte b)

      Convert byte to unsigned long. Java only has signed types so we have to do more work to get unsigned ops
      Parameters:
        `b` - input byte
      Returns:
        unsigned long value of byte

    - #### toString

          public String toString()

      Returns details of NTP packet as a string.
      Overrides:
        `toString` in class `Object`
      Returns:
        details of NTP packet as a string.

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