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High-performance Java Dataframe with integrated columnar storage (fork of tablesaw)
There is a newer version: 0.9.1
package org.datavec.dataframe.util;

import it.unimi.dsi.fastutil.ints.IntArrayList;
import it.unimi.dsi.fastutil.ints.IntIterator;
import org.roaringbitmap.RoaringBitmap;

/**
 *
 */
public class BitmapBackedSelection implements Selection {

    private final RoaringBitmap bitmap;

    public BitmapBackedSelection(RoaringBitmap bitmap) {
        this.bitmap = bitmap;
    }

    public BitmapBackedSelection() {
        this.bitmap = new RoaringBitmap();
    }

    public void add(int i) {
        bitmap.add(i);
    }

    @Override
    public int size() {
        return bitmap.getCardinality();
    }

    @Override
    public int[] toArray() {
        return bitmap.toArray();
    }

    @Override
    public RoaringBitmap toBitmap() {
        return bitmap.clone();
    }

    @Override
    public IntArrayList toIntArrayList() {
        return new IntArrayList(bitmap.toArray());
    }


    /**
     * Intersects the receiver and {@code otherSelection}, updating the receiver
     */
    @Override
    public void and(Selection otherSelection) {
        bitmap.and(otherSelection.toBitmap());
    }

    /**
     * Implements the union of the receiver and {@code otherSelection}, updating the receiver
     */
    @Override
    public void or(Selection otherSelection) {
        bitmap.or(otherSelection.toBitmap());
    }

    /**
     * Implements the set difference operation between the receiver and {@code otherSelection}, updating the receiver
     */
    @Override
    public void andNot(Selection otherSelection) {
        bitmap.andNot(otherSelection.toBitmap());
    }

    @Override
    public boolean isEmpty() {
        return size() == 0;
    }

    @Override
    public void clear() {
        bitmap.clear();
    }

    @Override
    public boolean contains(int i) {
        return bitmap.contains(i);
    }

    /**
     * Adds to the current bitmap all integers in [rangeStart,rangeEnd)
     *
     * @param start inclusive beginning of range
     * @param end   exclusive ending of range
     */
    @Override
    public void addRange(int start, int end) {
        bitmap.add(start, end);
    }

    @Override
    public int get(int i) {
        return bitmap.select(i);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;

        BitmapBackedSelection integers = (BitmapBackedSelection) o;

        return bitmap.equals(integers.bitmap);
    }

    @Override
    public int hashCode() {
        return bitmap.hashCode();
    }

    @Override
    public IntIterator iterator() {

        return new IntIterator() {

            private final org.roaringbitmap.IntIterator iterator = bitmap.getIntIterator();

            @Override
            public int nextInt() {
                return iterator.next();
            }

            @Override
            public int skip(int k) {
                throw new UnsupportedOperationException("Views do not support skipping in the iterator");
            }

            @Override
            public boolean hasNext() {
                return iterator.hasNext();
            }

            @Override
            public Integer next() {
                return iterator.next();
            }
        };
    }
}