GNU Trove

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.

GNU Trove

GNU Trove is copyright 2001-2003 Eric D. Friedman. All Rights Reserved.