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A general programming library in Java

There is a newer version: 1.10.1

/*
 * Copyright (C) 2016 HaiYang Li
 *
 * 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.landawn.abacus.util;

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

/**
 * 
 * @since 0.8
 * 
 * @author Haiyang Li
 */
public final class ImmutableSet extends ImmutableCollection implements Set {

    ImmutableSet(Set set) {
        super(Collections.unmodifiableSet(set));
    }

    @SafeVarargs
    public static  ImmutableSet of(E... a) {
        N.requireNonNull(a);

        return new ImmutableSet<>(N.asLinkedHashSet(a));
    }

    /**
     * 
     * @param set the elements in this Set are shared by the returned ImmutableSet.
     * @return
     */
    public static  ImmutableSet of(Set set) {
        N.requireNonNull(set);

        return new ImmutableSet<>(set);
    }

    /**
     * 
     * @param set
     * @return
     */
    public static  ImmutableSet copyOf(Set set) {
        N.requireNonNull(set);

        return new ImmutableSet<>(new HashSet<>(set));
    }
}