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Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.

There is a newer version: 1.3.0

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/*
 * (c) the authors Licensed under the Apache License, Version 2.0.
 */



/**
 * The org.roaringbitmap package  provides
 * one class ({@link org.roaringbitmap.RoaringBitmap}) that   users
 * can rely upon for fast set of integers.
 * 
 * 
 *  * {@code
 *      import org.roaringbitmap.*;
 *
 *      //...
 *
 *      RoaringBitmap r1 = new RoaringBitmap();
 *      for(int k = 4000; k<4255;++k) r1.add(k);
 *      
 *      RoaringBitmap r2 = new RoaringBitmap();
 *      for(int k = 1000; k<4255; k+=2) r2.add(k);
 *
 *      RoaringBitmap union = RoaringBitmap.or(r1, r2);
 *      RoaringBitmap intersection = RoaringBitmap.and(r1, r2);
 *
 *      //...
 *      DataOutputStream wheretoserialize = ...
 *      r1.runOptimize(); // can help compression
 *      r1.serialize(wheretoserialize);
 * }
 * 
 *
 */
package org.roaringbitmap;