com.topekalabs.collection.utils.SetUtils.java Source code

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Here is the source code for com.topekalabs.collection.utils.SetUtils.java

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/* 
 * Copyright 2014 Topeka Labs.
 *
 * 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.topekalabs.collection.utils;

import com.google.common.collect.Sets;
import com.topekalabs.collection.NNHashSet;
import java.util.Set;

/**
 * This class contains utility methods for sets.
 * @author Topeka Labs
 */
public class SetUtils {
    private SetUtils() {
        //Do nothing
    }

    /**
     * This method returns the union of the two provided sets.
     * @param <T> The type of the objects contained in the input sets.
     * @param setA An input set.
     * @param setB An input set.
     * @return The union of setA and setB.
     */
    public static <T> Set<T> unionSet(Set<T> setA, Set<T> setB) {
        Set<T> unionSet = Sets.newHashSet();

        unionSet.addAll(setA);
        unionSet.addAll(setB);

        return unionSet;
    }

    /**
     * This method returns the intersection of the two provided sets.
     * @param <T> The type of the objects contained in the input sets.
     * @param setA An input set.
     * @param setB An input set.
     * @return The intersection of setA and setB.
     */
    public static <T> Set<T> intersectSet(Set<T> setA, Set<T> setB) {
        Set<T> unionSetTemp = Sets.newHashSet();

        unionSetTemp.addAll(setA);
        unionSetTemp.removeAll(setB);

        Set<T> unionSet = Sets.newHashSet();
        unionSet.addAll(setA);
        unionSet.removeAll(unionSetTemp);

        return unionSet;
    }

    public static <T> NNHashSet<T> newNNHashSet() {
        return new NNHashSet<>();
    }
}