Module roaringbitmap

Package org.roaringbitmap.longlong

Class LongUtils

java.lang.Object

org.roaringbitmap.longlong.LongUtils

public class LongUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final long	MAX_UNSIGNED_INT

Constructor Summary

Constructors

Constructor	Description
LongUtils()

Method Summary

Modifier and Type	Method	Description
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 boolean	isMaxHigh(long key)	checks if given high48 is the maximum possible one (e.g.
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)	Reconstruct the long data.
static long	toLong(byte[] high, char low)	reconstruct the long data
static long	toLong(long high, char low)

Methods inherited from class java.lang.Object

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

Field Details

MAX_UNSIGNED_INT

public static final long MAX_UNSIGNED_INT

Constructor Details

LongUtils

public LongUtils()

Method Details

highPart

public static byte[] highPart(long num)

get the high 48 bit parts of the input data

Parameters:

num - the long number

Returns:

the high 48 bit

lowPart

public static char lowPart(long num)

get the low 16 bit parts of the input data

Parameters:

num - the long number

Returns:

the low 16 bit

toLong

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

reconstruct the long data

Parameters:

high - the high 48 bit

low - the low 16 bit

Returns:

the long data

toLong

public static long toLong(byte[] high)

Reconstruct the long data.

Parameters:

high - the high 48 bit

Returns:

the long data

toLong

public static long toLong(long high,
 char low)

toBDBytes

public static byte[] toBDBytes(long v)

to big endian bytes representation

Parameters:

v - a long value

Returns:

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

Parameters:

work - the byte array

Returns:

the long data

initWithFirst4Byte

public static long initWithFirst4Byte(int v)

initialize a long value with the given fist 32 bit

Parameters:

v - first 32 bit value

Returns:

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

Parameters:

num - long being treated as unsigned long

Returns:

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

Parameters:

num - uint48 to be shift back into uint64

Returns:

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

Parameters:

num - the long number

high48 - the byte array

Returns:

the high 48 bit

isMaxHigh

public static boolean isMaxHigh(long key)

checks if given high48 is the maximum possible one (e.g. it is the case for -1L, which is the maximum unsigned long)

Parameters:

key - long

Returns:

true if this the maximum high part