Package us.ihmc.euclid.tools

Class EuclidHashCodeTools

java.lang.Object

us.ihmc.euclid.tools.EuclidHashCodeTools

public class EuclidHashCodeTools
extends java.lang.Object

Generic operations on hash-code used throughout this library for computing hash-codes of object as Point3D.

Author:

Sylvain Bertrand

Field Summary

Fields

Modifier and Type	Field	Description
static long	MULTIPLIER	Long used for the multiplication factor in each step of the hash.

Constructor Summary

Constructors

Constructor	Description
EuclidHashCodeTools()

Method Summary

Modifier and Type	Method	Description
static long	addToHashCode(long hashCode, double value)	Calls combineHashCode(long, long) after converting value to long bits.
static long	addToHashCode(long hashCode, float value)	Calls combineHashCode(long, long) after converting value to int bits.
static long	combineHashCode(long hashCode1, long hashCode2)	Combine the two hash code bit streams.
static int	toIntHashCode(long bits)	Returns a hash bit stream as an integer hash value.

Methods inherited from class java.lang.Object

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

Field Detail

MULTIPLIER

public static final long MULTIPLIER

Long used for the multiplication factor in each step of the hash.

See Also:

Constant Field Values

Constructor Detail

EuclidHashCodeTools

public EuclidHashCodeTools()

Method Detail

toIntHashCode

public static int toIntHashCode(long bits)

Returns a hash bit stream as an integer hash value.

Parameters:

bits - the bits to turn into integer hash code.

Returns:

final integer hash value.

addToHashCode

public static long addToHashCode(long hashCode,
                                 double value)

Calls combineHashCode(long, long) after converting value to long bits.

Parameters:

hashCode - long hash code bit stream to add to.

value - double value to add to the hash code.

Returns:

new hash code bit stream

addToHashCode

public static long addToHashCode(long hashCode,
                                 float value)

Calls combineHashCode(long, long) after converting value to int bits.

Parameters:

hashCode - long hash code bit stream to add to.

value - float value to add to the hash code.

Returns:

new hash code bit stream

combineHashCode

public static long combineHashCode(long hashCode1,
                                   long hashCode2)

Combine the two hash code bit streams.

Parameters:

hashCode1 - first hash code to combine.

hashCode2 - second hash code to combine.

Returns:

combined hash code, hashCode1 + MULTIPLIER * hashCode2