Example usage for org.apache.hadoop.util.hash Hash getInstance

Introduction

In this page you can find the example usage for org.apache.hadoop.util.hash Hash getInstance.

Prototype

public static Hash getInstance(Configuration conf) 

Source Link

Document

Get a singleton instance of hash function of a type defined in the configuration.

Usage

From source file:org.apache.giraph.utils.bloom.HashFunction.java

License:Open Source License

/**
 * Constructor./*  www .  j a v  a2  s  .com*/
 * <p>
 * Builds a hash function that must obey to a given maximum number of returned values and a highest value.
 * @param maxValue The maximum highest returned value.
 * @param nbHash The number of resulting hashed values.
 * @param hashType type of the hashing function (see {@link Hash}).
 */
public HashFunction(int maxValue, int nbHash, int hashType) {
    if (maxValue <= 0) {
        throw new IllegalArgumentException("maxValue must be > 0");
    }

    if (nbHash <= 0) {
        throw new IllegalArgumentException("nbHash must be > 0");
    }

    this.maxValue = maxValue;
    this.nbHash = nbHash;
    this.hashFunction = Hash.getInstance(hashType);
    if (this.hashFunction == null)
        throw new IllegalArgumentException("hashType must be known");
}

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