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A lightweight alternative to Java 8 sequential Stream

There is a newer version: 2.3.0

/*
 * Copyright 2016 Daniel Skogquist Åborg
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.d2ab.collection;

import java.util.BitSet;

import static java.util.Objects.requireNonNull;

/**
 * Utility methods for {@link BitSet}s.
 */
public class BitSets {
	private BitSets() {
	}

	public static boolean add(BitSet bitSet, int index) {
		requireNonNull(bitSet);
		boolean cleared = !bitSet.get(index);
		if (cleared) {
			bitSet.set(index);
		}
		return cleared;
	}
}