org.thales.punch.libraries.punchlang.api

Class PunchBloomFilter<T>

java.lang.Object

org.thales.punch.libraries.punchlang.api.PunchBloomFilter<T>

public class PunchBloomFilter<T>
extends Object

A light wrap up of the orestes bloom filter.

What it adds it to generate a json representation in which the bits (typically large) is compressed and base64 encoded.

Author:

dimi

Constructor Summary

Constructors

Constructor and Description
PunchBloomFilter(int expectedInsertions, double fpp) Ctor.

Method Summary

Modifier and Type	Method and Description
void	add(T element) Add an element
String	asJson()
static PunchBloomFilter<String>	buildFromString(String s)
boolean	contains(T element)

Methods inherited from class java.lang.Object

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

Constructor Detail

PunchBloomFilter

public PunchBloomFilter(int expectedInsertions,
                        double fpp)

Ctor.

Parameters:

expectedInsertions - the expected number of insertions

fpp - the false positive probability

Method Detail

buildFromString

public static PunchBloomFilter<String> buildFromString(String s)

Parameters:

s - a serialized bloom filter

Returns:

a ready to use bloom filter

asJson

public String asJson()

Returns:

a json representation of this bloom filter.

contains

public boolean contains(T element)

Parameters:

element - the element to check for

Returns:

true if the element is already in the bloom

add

public void add(T element)

Add an element

Parameters:

element - the element to add