org.jau.util.Hash32 Class Reference

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Static Public Member Functions
static int	hash (final int prime, final byte a[])
static int	hash (final int prime, final int a, final int b)
static int	hash31 (final int a, final int b)
	Generates a 32bit equally distributed hash value using prime 31. More...
static int	hash31 (final long addr)
	Generates a 32bit equally distributed identity hash value from addr avoiding XOR collision using prime 31. More...
static int	hash31 (final long addr, final long size)
	Generates a 32bit equally distributed identity hash value from addr and size avoiding XOR collision using prime 31. More...

Detailed Description

Definition at line 26 of file Hash32.java.

Member Function Documentation

hash() [1/2]

static int org.jau.util.Hash32.hash ( final int  prime, final byte  a[]  )

static

• 31 - the traditional 'Java' prime for 31 * x == (x << 5) - x
• 92821 - result of Hans-Peter Stoerr's finding

Parameters

prime
a

Returns

Definition at line 37 of file Hash32.java.

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hash() [2/2]

static int org.jau.util.Hash32.hash ( final int  prime, final int  a, final int  b  )

static

Definition at line 48 of file Hash32.java.

hash31() [1/3]

static int org.jau.util.Hash32.hash31 ( final int  a, final int  b  )

static

Generates a 32bit equally distributed hash value using prime 31.

Definition at line 56 of file Hash32.java.

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hash31() [2/3]

static int org.jau.util.Hash32.hash31 ( final long  addr )

static

Generates a 32bit equally distributed identity hash value from addr avoiding XOR collision using prime 31.

Definition at line 66 of file Hash32.java.

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hash31() [3/3]

static int org.jau.util.Hash32.hash31 ( final long  addr, final long  size  )

static

Generates a 32bit equally distributed identity hash value from addr and size avoiding XOR collision using prime 31.

Definition at line 77 of file Hash32.java.

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The documentation for this class was generated from the following file:

• java_base/org/jau/util/Hash32.java