org.apache.hadoop.util.bloom

类 HashFunction

java.lang.Object

org.apache.hadoop.util.bloom.HashFunction

public final class HashFunction
extends Object

Implements a hash object that returns a certain number of hashed values.

另请参阅:

The general behavior of a key being stored in a filter, The general behavior of a filter

构造器概要

构造器

构造器和说明
HashFunction(int maxValue, int nbHash, int hashType) Constructor.

方法概要

方法

限定符和类型	方法和说明
void	clear() Clears this hash function.
int[]	hash(Key k) Hashes a specified key into several integers.

从类继承的方法 java.lang.Object

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

构造器详细资料

HashFunction

public HashFunction(int maxValue,
            int nbHash,
            int hashType)

Constructor.

Builds a hash function that must obey to a given maximum number of returned values and a highest value.

参数:

maxValue - The maximum highest returned value.

nbHash - The number of resulting hashed values.

hashType - type of the hashing function (see Hash).

方法详细资料

clear

public void clear()

Clears this hash function. A NOOP

hash

public int[] hash(Key k)

Hashes a specified key into several integers.

参数:

k - The specified key.

返回:

The array of hashed values.