org.apache.paimon.utils

类 MurmurHashUtils

java.lang.Object

org.apache.paimon.utils.MurmurHashUtils

public final class MurmurHashUtils
extends Object

Murmur Hash. This is inspired by Guava's Murmur3_32HashFunction.

字段概要

字段

限定符和类型	字段和说明
static int	DEFAULT_SEED

方法概要

限定符和类型	方法和说明
static int	fmix(int h)
static long	fmix(long h)
static int	hashBytes(byte[] bytes) Hash bytes.
static int	hashBytes(MemorySegment segment, int offset, int lengthInBytes) Hash bytes in MemorySegment.
static int	hashBytesByWords(MemorySegment segment, int offset, int lengthInBytes) Hash bytes in MemorySegment, length must be aligned to 4 bytes.
static int	hashBytesPositive(byte[] bytes) Hash bytes.
static int	hashUnsafeBytes(Object base, long offset, int lengthInBytes) Hash unsafe bytes.
static int	hashUnsafeBytesByWords(Object base, long offset, int lengthInBytes) Hash unsafe bytes, length must be aligned to 4 bytes.

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_SEED

public static final int DEFAULT_SEED

另请参阅:

常量字段值

方法详细资料

hashUnsafeBytesByWords

public static int hashUnsafeBytesByWords(Object base,
                                         long offset,
                                         int lengthInBytes)

Hash unsafe bytes, length must be aligned to 4 bytes.

参数:

base - base unsafe object

offset - offset for unsafe object

lengthInBytes - length in bytes

返回:

hash code

hashBytesPositive

public static int hashBytesPositive(byte[] bytes)

Hash bytes.

hashBytes

public static int hashBytes(byte[] bytes)

Hash bytes.

hashUnsafeBytes

public static int hashUnsafeBytes(Object base,
                                  long offset,
                                  int lengthInBytes)

Hash unsafe bytes.

参数:

base - base unsafe object

offset - offset for unsafe object

lengthInBytes - length in bytes

返回:

hash code

hashBytesByWords

public static int hashBytesByWords(MemorySegment segment,
                                   int offset,
                                   int lengthInBytes)

Hash bytes in MemorySegment, length must be aligned to 4 bytes.

参数:

segment - segment.

offset - offset for MemorySegment

lengthInBytes - length in MemorySegment

返回:

hash code

hashBytes

public static int hashBytes(MemorySegment segment,
                            int offset,
                            int lengthInBytes)

Hash bytes in MemorySegment.

参数:

segment - segment.

offset - offset for MemorySegment

lengthInBytes - length in MemorySegment

返回:

hash code

fmix

public static int fmix(int h)

fmix

public static long fmix(long h)