org.bitlap.roaringbitmap.longlong

类 LongUtils

java.lang.Object

org.bitlap.roaringbitmap.longlong.LongUtils

public class LongUtils
extends java.lang.Object

构造器概要

构造器

构造器和说明
LongUtils()

方法概要

限定符和类型	方法和说明
static int	compareHigh(byte[] a, byte[] b) compare according to the dictionary order
static long	fromBDBytes(byte[] work) get the long from the big endian representation bytes
static byte[]	highPart(long num) get the high 48 bit parts of the input data
static byte[]	highPartInPlace(long num, byte[] high48) set the high 48 bit parts of the input number into the given byte array
static long	initWithFirst4Byte(int v) initialize a long value with the given fist 32 bit
static long	leftShiftHighPart(long num) shift the long by left the container size amount so we use the value after have done our steps
static char	lowPart(long num) get the low 16 bit parts of the input data
static int	maxLowBitAsInteger()
static long	rightShiftHighPart(long num) shift the long right by the container size amount so we can loop across containers by +1 steps
static byte[]	toBDBytes(long v) to big endian bytes representation
static long	toLong(byte[] high, char low) reconstruct the long data

从类继承的方法 java.lang.Object

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

构造器详细资料

LongUtils

public LongUtils()

方法详细资料

highPart

public static byte[] highPart(long num)

get the high 48 bit parts of the input data

参数:

num - the long number

返回:

the high 48 bit

lowPart

public static char lowPart(long num)

get the low 16 bit parts of the input data

参数:

num - the long number

返回:

the low 16 bit

toLong

public static long toLong(byte[] high,
                          char low)

reconstruct the long data

参数:

high - the high 48 bit

low - the low 16 bit

返回:

the long data

toBDBytes

public static byte[] toBDBytes(long v)

to big endian bytes representation

参数:

v - a long value

返回:

the input long value's big endian byte array representation

fromBDBytes

public static long fromBDBytes(byte[] work)

get the long from the big endian representation bytes

参数:

work - the byte array

返回:

the long data

compareHigh

public static int compareHigh(byte[] a,
                              byte[] b)

compare according to the dictionary order

参数:

a - a byte array

b - another byte array

返回:

1 indicates a greater than b,0 indicates equal,-1 indicates a smaller than b

initWithFirst4Byte

public static long initWithFirst4Byte(int v)

initialize a long value with the given fist 32 bit

参数:

v - first 32 bit value

返回:

a long value

rightShiftHighPart

public static long rightShiftHighPart(long num)

shift the long right by the container size amount so we can loop across containers by +1 steps

参数:

num - long being treated as unsigned long

返回:

value shifted out of value space into container high part

leftShiftHighPart

public static long leftShiftHighPart(long num)

shift the long by left the container size amount so we use the value after have done our steps

参数:

num - uint48 to be shift back into uint64

返回:

value shifted out of container high part back into value space

maxLowBitAsInteger

public static int maxLowBitAsInteger()

highPartInPlace

public static byte[] highPartInPlace(long num,
                                     byte[] high48)

set the high 48 bit parts of the input number into the given byte array

参数:

num - the long number

high48 - the byte array

返回:

the high 48 bit