org.apache.hadoop.util.bloom

クラス HashFunction

java.lang.Object

org.apache.hadoop.util.bloom.HashFunction

@InterfaceAudience.Public
 @InterfaceStability.Stable
public final class HashFunction
extends Object

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

関連項目:

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

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
HashFunction(int maxValue, int nbHash, int hashType) Constructor.

メソッドのサマリー

修飾子とタイプ	メソッドと説明
void	clear() Clears this hash function.
int[]	hash(org.apache.hadoop.util.bloom.Key k) Hashes a specified key into several integers.

クラスから継承されたメソッド java.lang.Object

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

コンストラクタの詳細

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.

パラメータ:

maxValue - The maximum highest returned value.

nbHash - The number of resulting hashed values.

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

メソッドの詳細

clear

public void clear()

Clears this hash function. A NOOP

hash

public int[] hash(org.apache.hadoop.util.bloom.Key k)

Hashes a specified key into several integers.

パラメータ:

k - The specified key.

戻り値:

The array of hashed values.