Package com.google.common.hash

Class SipHashFunction

java.lang.Object

com.google.common.hash.AbstractHashFunction

com.google.common.hash.SipHashFunction

All Implemented Interfaces:

HashFunction, java.io.Serializable

final class SipHashFunction
extends AbstractHashFunction
implements java.io.Serializable

HashFunction implementation of SipHash-c-d.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	SipHashFunction.SipHasher

Field Summary

Fields

Modifier and Type	Field	Description
private int	c
private int	d
private long	k0
private long	k1
private static long	serialVersionUID
(package private) static HashFunction	SIP_HASH_24

Constructor Summary

Constructors

Constructor	Description
SipHashFunction(int c, int d, long k0, long k1)

Method Summary

Modifier and Type	Method	Description
int	bits()	Returns the number of bits (a multiple of 32) that each hash code produced by this hash function has.
boolean	equals(java.lang.Object object)
int	hashCode()
Hasher	newHasher()	Begins a new hash code computation by returning an initialized, stateful Hasher instance that is ready to receive data.
java.lang.String	toString()

Methods inherited from class com.google.common.hash.AbstractHashFunction

hashBytes, hashBytes, hashBytes, hashInt, hashLong, hashObject, hashString, hashUnencodedChars, newHasher

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SIP_HASH_24

static final HashFunction SIP_HASH_24

c

private final int c

d

private final int d

k0

private final long k0

k1

private final long k1

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

SipHashFunction

SipHashFunction(int c,
                int d,
                long k0,
                long k1)

Parameters:

c - the number of compression rounds (must be positive)

d - the number of finalization rounds (must be positive)

k0 - the first half of the key

k1 - the second half of the key

Method Detail

bits

public int bits()

Description copied from interface: HashFunction

Returns the number of bits (a multiple of 32) that each hash code produced by this hash function has.

Specified by:

bits in interface HashFunction

newHasher

public Hasher newHasher()

Description copied from interface: HashFunction

Begins a new hash code computation by returning an initialized, stateful Hasher instance that is ready to receive data. Example:

 HashFunction hf = Hashing.md5();
 HashCode hc = hf.newHasher()
     .putLong(id)
     .putBoolean(isActive)
     .hash();
 

Specified by:

newHasher in interface HashFunction

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object object)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object