test.it.unimi.dsi.big.mg4j.tool.Modulo3DocumentalClusteringStrategy Maven / Gradle / Ivy

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MG4J (Managing Gigabytes for Java) is a free full-text search engine for large document collections written in Java. The big version is a fork of the original MG4J that can handle more than 2^31 terms and documents.

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package it.unimi.dsi.big.mg4j.tool;

import it.unimi.dsi.big.mg4j.index.cluster.DocumentalClusteringStrategy;
import it.unimi.dsi.big.mg4j.index.cluster.DocumentalPartitioningStrategy;
import it.unimi.dsi.util.Properties;

public final class Modulo3DocumentalClusteringStrategy implements DocumentalClusteringStrategy, DocumentalPartitioningStrategy {
	private static final long serialVersionUID = 1L;

	final int documents;

	public Modulo3DocumentalClusteringStrategy( final int documents ) {
		this.documents = documents;
	}

	public long globalPointer( int localIndex, long localPointer ) { return localPointer; }
	public long localPointer( long globalPointer ) { return globalPointer; }
	public long numberOfDocuments( int localIndex ) { return documents; }
	public int numberOfLocalIndices() { return 3; }
	public int localIndex( long globalPointer ) { return (int)( globalPointer % 3 ); }
	public Properties[] properties() { return new Properties[ 3 ]; }
}