com.facebook.buck.util.MoreSets.java Source code

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Here is the source code for com.facebook.buck.util.MoreSets.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * 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.facebook.buck.util;

import com.google.common.collect.Sets;

import java.util.LinkedHashSet;
import java.util.Set;

public abstract class MoreSets {

    /**
     * Returns a new and mutable set containing the intersection of the
     * two specified sets. Using the smaller of the two sets as the base for
     * finding the intersection for performance reasons.
     */
    public static <T> Set<T> intersection(Set<T> x, Set<T> y) {
        Set<T> result = new LinkedHashSet<>();
        if (x.size() > y.size()) {
            Sets.intersection(y, x).copyInto(result);
        } else {
            Sets.intersection(x, y).copyInto(result);
        }
        return result;
    }
}