org.bitlap.roaringbitmap.longlong

类 IntegerUtil

java.lang.Object

org.bitlap.roaringbitmap.longlong.IntegerUtil

public class IntegerUtil
extends java.lang.Object

构造器概要

构造器

构造器和说明
IntegerUtil()

方法概要

限定符和类型	方法和说明
static byte	firstByte(int v) fetch the first byte
static int	fromBDBytes(byte[] bytes) convert into its integer representation
static int	setByte(int v, byte bv, int pos) set a specified position byte to another value to return a fresh integer
static int	shiftLeftFromSpecifiedPosition(int v, int pos, int count) shift the byte left from the specified position
static byte[]	toBDBytes(int v) convert integer to its byte array format

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

IntegerUtil

public IntegerUtil()

方法详细资料

toBDBytes

public static byte[] toBDBytes(int v)

convert integer to its byte array format

参数:

v - an input integer value

返回:

the big endian byte array representation

fromBDBytes

public static int fromBDBytes(byte[] bytes)

convert into its integer representation

参数:

bytes - the big endian integer's byte array

返回:

a integer corresponding to input bytes

setByte

public static int setByte(int v,
                          byte bv,
                          int pos)

set a specified position byte to another value to return a fresh integer

参数:

v - the input integer value

bv - the byte value to insert

pos - the position of an 4 byte array to replace

返回:

a fresh integer after a specified position byte been replaced

shiftLeftFromSpecifiedPosition

public static int shiftLeftFromSpecifiedPosition(int v,
                                                 int pos,
                                                 int count)

shift the byte left from the specified position

参数:

v - a integer value

pos - the position from which to shift byte values left

count - the shifting numbers

返回:

a fresh integer value

firstByte

public static byte firstByte(int v)

fetch the first byte

参数:

v - an input integer

返回:

the first byte of the big endian representation