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package com.artemis.utils;

import java.util.BitSet;

public final class ConverterUtil {
	private ConverterUtil() {}

	public static IntBag toIntBag(BitVector bs, IntBag out) {
		return bs.toIntBag(out);
	}

	public static IntBag toIntBag(BitSet bs, IntBag out) {
		if (bs.isEmpty()) {
			out.setSize(0);
			return out;
		}

		int size = bs.cardinality();
		out.setSize(size);
		out.ensureCapacity(size);

		int[] activesArray = out.getData();
		for (int i = 0, id = -1, s = size; s > i; i++) {
			id = bs.nextSetBit(id + 1);
			activesArray[i] = id;
		}

		return out;
	}

	public static BitVector toBitVector(IntBag bag, BitVector out) {
		int[] data = bag.getData();
		for (int i = 0, s = bag.size(); s > i; i++) {
			out.set(data[i]);
		}

		return out;
	}

	public static BitSet toBitSet(IntBag bag, BitSet out) {
		int[] data = bag.getData();
		for (int i = 0, s = bag.size(); s > i; i++) {
			out.set(data[i]);
		}

		return out;
	}
}