Example usage for org.apache.hadoop.util.bloom HashFunction HashFunction

Introduction

In this page you can find the example usage for org.apache.hadoop.util.bloom HashFunction HashFunction.

Prototype

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

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Document

Constructor.

Usage

From source file:org.apache.accumulo.core.bloomfilter.Filter.java

License:Open Source License

/**
 * Constructor.//from  w  ww  .  jav  a  2  s  .c  o  m
 *
 * @param vectorSize
 *          The vector size of <i>this</i> filter.
 * @param nbHash
 *          The number of hash functions to consider.
 * @param hashType
 *          type of the hashing function (see {@link Hash}).
 */
protected Filter(final int vectorSize, final int nbHash, final int hashType) {
    this.vectorSize = vectorSize;
    this.nbHash = nbHash;
    this.hashType = hashType;
    this.hash = new HashFunction(this.vectorSize, this.nbHash, this.hashType);
}

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From source file:org.apache.accumulo.core.bloomfilter.Filter.java

License:Open Source License

@Override
public void readFields(final DataInput in) throws IOException {
    final int ver = in.readInt();
    rVersion = ver;/*  w ww.  java2 s . c  om*/
    if (ver > 0) { // old unversioned format
        this.nbHash = ver;
        this.hashType = Hash.JENKINS_HASH;

    } else if (ver == VERSION | ver == VERSION + 1) { // Support for directly serialzing the bitset
        this.nbHash = in.readInt();
        this.hashType = in.readByte();
    } else {
        throw new IOException("Unsupported version: " + ver);
    }
    this.vectorSize = in.readInt();
    this.hash = new HashFunction(this.vectorSize, this.nbHash, this.hashType);
}

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