Package org.h2.dev.hash

Class MinimalPerfectHash.LongHash

java.lang.Object

org.h2.dev.hash.MinimalPerfectHash.LongHash

All Implemented Interfaces:

MinimalPerfectHash.UniversalHash<Long>

Enclosing class:

MinimalPerfectHash<K>

public static class MinimalPerfectHash.LongHash
extends Object
implements MinimalPerfectHash.UniversalHash<Long>

A sample hash implementation for long keys.

Constructor Summary

Constructors

Constructor	Description
LongHash()

Method Summary

Modifier and Type	Method	Description
int	hashCode(Long o, int index, int seed)	Calculate the hash of the given object.

Methods inherited from class java.lang.Object

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

Constructor Details

LongHash

public LongHash()

Method Details

hashCode

public int hashCode(Long o,
 int index,
 int seed)

Description copied from interface: MinimalPerfectHash.UniversalHash

Calculate the hash of the given object.

Specified by:

hashCode in interface MinimalPerfectHash.UniversalHash<Long>

Parameters:

o - the object

index - the hash function index (index 0 is used first, so the method should be very fast with index 0; index 1 and so on are only called when really needed)

seed - the random seed (always the same for a hash table)

Returns:

the hash value