org.aoju.bus.core.text

Class Simhash

java.lang.Object

org.aoju.bus.core.text.Simhash

public class Simhash
extends Object

局部敏感hash,用于海量文本去重 局部敏感hash定义：假定两个字符串具有一定的相似性, 在hash之后,仍然能保持这种相似性,就称之为局部敏感hash

Since:

JDK 1.8+

Version:

5.5.3

Author:

Kimi Liu

Constructor Summary

Constructors

Constructor and Description
Simhash() 构造
Simhash(int fracCount, int hammingThresh) 构造

Method Summary

Modifier and Type	Method and Description
boolean	equals(Collection<? extends CharSequence> segList) 判断文本是否与已存储的数据重复
long	hash(Collection<? extends CharSequence> segList) 指定文本计算simhash值
void	store(Long simhash) 按照索引进行存储

Methods inherited from class java.lang.Object

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

Constructor Detail

Simhash

public Simhash()

构造

Simhash

public Simhash(int fracCount,
               int hammingThresh)

构造

Parameters:

fracCount - 存储段数

hammingThresh - 汉明距离的衡量标准

Method Detail

hash

public long hash(Collection<? extends CharSequence> segList)

指定文本计算simhash值

Parameters:

segList - 分词的词列表

Returns:

Hash值

equals

public boolean equals(Collection<? extends CharSequence> segList)

判断文本是否与已存储的数据重复

Parameters:

segList - 文本分词后的结果

Returns:

是否重复

store

public void store(Long simhash)

按照索引进行存储

Parameters:

simhash - Simhash值