cn.hutool.bloomfilter.filter

Class AbstractFilter

java.lang.Object

cn.hutool.bloomfilter.filter.AbstractFilter

All Implemented Interfaces:

BloomFilter, Serializable

Direct Known Subclasses:

FuncFilter

public abstract class AbstractFilter
extends Object
implements BloomFilter

抽象Bloom过滤器

Author:

loolly

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected static int	DEFAULT_MACHINE_NUM
protected long	size

Constructor Summary

Constructors

Constructor and Description
AbstractFilter(long maxValue) 构造32位
AbstractFilter(long maxValue, int machineNum) 构造

Method Summary

Modifier and Type	Method and Description
boolean	add(String str) 在boolean的bitMap中增加一个字符串 如果存在就返回false .如果不存在.先增加这个字符串.再返回true
boolean	contains(String str)
abstract long	hash(String str) 自定义Hash方法
void	init(long maxValue, int machineNum) 初始化

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_MACHINE_NUM

protected static int DEFAULT_MACHINE_NUM

size

protected long size

Constructor Detail

AbstractFilter

public AbstractFilter(long maxValue,
                      int machineNum)

构造

Parameters:

maxValue - 最大值

machineNum - 机器位数

AbstractFilter

public AbstractFilter(long maxValue)

构造32位

Parameters:

maxValue - 最大值

Method Detail

init

public void init(long maxValue,
                 int machineNum)

初始化

Parameters:

maxValue - 最大值

machineNum - 机器位数

contains

public boolean contains(String str)

Specified by:

contains in interface BloomFilter

Parameters:

str - 字符串

Returns:

判断一个字符串是否bitMap中存在

add

public boolean add(String str)

Description copied from interface: BloomFilter

在boolean的bitMap中增加一个字符串
如果存在就返回false .如果不存在.先增加这个字符串.再返回true

Specified by:

add in interface BloomFilter

Parameters:

str - 字符串

Returns:

是否加入成功，如果存在就返回false .如果不存在返回true

hash

public abstract long hash(String str)

自定义Hash方法

Parameters:

str - 字符串

Returns:

HashCode