org.helidb.lang.hasher
Class HasherSupport

java.lang.Object
  org.helidb.lang.hasher.HasherSupport

public final class HasherSupport
extends Object

This class contains static utility methods used by Hasher implementations.

Since:

1.0

Author:

Karl Gustafsson

In_jar:

helidb-core

Method Summary

static byte

getByteMask(int noOfBits) Create a byte mask that will keep the noOfBits least significant bits in a byte.

Methods inherited from class java.lang.Object

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

Method Detail

getByteMask

public static byte getByteMask(int noOfBits)
                        throws IllegalArgumentException

Create a byte mask that will keep the noOfBits least significant bits in a byte.

Parameters:

noOfBits - The number of bits to keep in a masked byte.

Returns:

A byte mask value that can be AND:ed with a byte.

Throws:

IllegalArgumentException - If noOfBits is not between 0 and 8 (inclusive).