/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.sysds.runtime.matrix.data.sketch.countdistinct;

import java.util.Set;
import java.util.function.BinaryOperator;

public class BitMapValueCombiner implements BinaryOperator<Set<Long>> {

	@Override
	public Set<Long> apply(Set<Long> set0, Set<Long> set1) {
		if (set0.isEmpty()) {
			return set1;
		}

		if (set1.isEmpty()) {
			return set0;
		}

		// Merging left-right is identical to merging right-left
		set0.addAll(set1);
		return set0;
	}
}
