gnu.trove
Class HashFunctions

java.lang.Object
  gnu.trove.HashFunctions

public final class HashFunctions
extends java.lang.Object

Provides various hash functions.

Version:

1.0, 09/24/99

Author:

wolfgang.hoschek@cern.ch

Constructor Summary

HashFunctions()

Method Summary

static int	hash(double value) Returns a hashcode for the specified value.
static int	hash(float value) Returns a hashcode for the specified value.
static int	hash(int value) Returns a hashcode for the specified value.
static int	hash(long value) Returns a hashcode for the specified value.
static int	hash(java.lang.Object object) Returns a hashcode for the specified object.

Methods inherited from class java.lang.Object

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

Constructor Detail

HashFunctions

public HashFunctions()

Method Detail

hash

public static final int hash(double value)

Returns a hashcode for the specified value.

Returns:

a hash code value for the specified value.

hash

public static final int hash(float value)

Returns a hashcode for the specified value.

Returns:

a hash code value for the specified value.

hash

public static final int hash(int value)

Returns a hashcode for the specified value. The hashcode is computed as

 
 31^5*(d[0]*31^(n-1) + d[1]*31^(n-2) + ... + d[n-1])
 

using int arithmetic, where d[i] is the ith digit of the value, counting from the right, n is the number of decimal digits of the specified value, and ^ indicates exponentiation. (The hash value of the value zero is zero.)

Returns:

a hash code value for the specified value.

hash

public static final int hash(long value)

Returns a hashcode for the specified value.

Returns:

a hash code value for the specified value.

hash

public static final int hash(java.lang.Object object)

Returns a hashcode for the specified object.

Returns:

a hash code value for the specified object.