Class Murmur3F

java.lang.Object

io.nosqlbench.virtdata.murmur.Murmur3F

All Implemented Interfaces:

Checksum128, Checksum

public class Murmur3F
extends Object
implements Checksum128

Murmur3F (MurmurHash3_x64_128)

Constructor Summary

Constructors

Constructor	Description
Murmur3F()
Murmur3F(int seed)
Murmur3F(int seed, boolean unsafe)	This constructor allows you to require that an unsafe implementation of primitive array operations is used, for added speed on platforms that you know can support it.

Method Summary

Modifier and Type	Method	Description
long	getValue()
BigInteger	getValueBigInteger()	Positive value.
byte[]	getValueBytesBigEndian()	Big endian is the default in Java / network byte order.
byte[]	getValueBytesLittleEndian()	Big endian is used by most machines natively.
String	getValueHexString()	Padded with leading 0s to ensure length of 32.
long	getValueHigh()	Returns the higher 64 bits of the 128 bit hash.
void	reset()
void	update(byte[] b)
void	update(byte[] b, int off, int len)
void	update(int b)
void	updateLongBE(long value)	Consider updateLongLE(long) for better performance if you do not rely on big endian (BE) byte order.
void	updateLongLE(long value)	Special update method to hash long values very efficiently using Java's native little endian (LE) byte order.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.zip.Checksum

update

Constructor Details

Murmur3F

public Murmur3F(int seed,
 boolean unsafe)

This constructor allows you to require that an unsafe implementation of primitive array operations is used, for added speed on platforms that you know can support it. This allows callers to have an easy way to exclusively opt in or out of unsafe behavior at a class-loader level, rather than forcing an unsafe behavior before the caller gets a chance to intervene. The choice is either/or, not "optional, but fall back if not supported." Callers can instrument for this with exception handling if it is needed. Effectively, setting the unsafe value chooses an implementation.

Parameters:

seed - A seed to initialize this hash with, or the input when using it as a function.

unsafe - Whether to require that the implementation relies on an unsafe calls.

Murmur3F

public Murmur3F()

Murmur3F

public Murmur3F(int seed)

Method Details

update

public void update(int b)

Specified by:

update in interface Checksum

updateLongLE

public void updateLongLE(long value)

Special update method to hash long values very efficiently using Java's native little endian (LE) byte order. Note, that you cannot mix this with other (previous) hash updates, because it only supports 8-bytes alignment.

Parameters:

value - The long value to update

updateLongBE

public void updateLongBE(long value)

Consider updateLongLE(long) for better performance if you do not rely on big endian (BE) byte order.

Parameters:

value - value to update

update

public void update(byte[] b)

Specified by:

update in interface Checksum

update

public void update(byte[] b,
 int off,
 int len)

Specified by:

update in interface Checksum

getValue

public long getValue()

Specified by:

getValue in interface Checksum

getValueHigh

public long getValueHigh()

Returns the higher 64 bits of the 128 bit hash.

Specified by:

getValueHigh in interface Checksum128

Returns:

Returns the higher 64 bits of the 128 bit hash.

getValueBigInteger

public BigInteger getValueBigInteger()

Positive value.

Specified by:

getValueBigInteger in interface Checksum128

Returns:

Positive value.

getValueHexString

public String getValueHexString()

Padded with leading 0s to ensure length of 32.

Specified by:

getValueHexString in interface Checksum128

Returns:

Padded with leading 0s to ensure length of 32.

getValueBytesBigEndian

public byte[] getValueBytesBigEndian()

Description copied from interface: Checksum128

Big endian is the default in Java / network byte order.

Specified by:

getValueBytesBigEndian in interface Checksum128

Returns:

Big Endian bytes

getValueBytesLittleEndian

public byte[] getValueBytesLittleEndian()

Description copied from interface: Checksum128

Big endian is used by most machines natively.

Specified by:

getValueBytesLittleEndian in interface Checksum128

Returns:

Little Endian bytes

reset

public void reset()

Specified by:

reset in interface Checksum