android-34/com/android/server/backup/utils/SetUtils.java

/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * 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 com.android.server.backup.utils;

import java.util.HashSet;
import java.util.Set;

/**
 * Helper class containing common operation on {@link java.util.Set}.
 */
public final class SetUtils {
    // Statics only
    private SetUtils() {}

    /**
     * Returns union of two sets.
     */
    public static <T> Set<T> union(Set<T> set1, Set<T> set2) {
        Set<T> unionSet = new HashSet<>(set1);
        unionSet.addAll(set2);
        return unionSet;
    }
}