/*
 * Copyright (c) 2018-2020 bartimaeusnek Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
 * conditions: The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package bartworks.util;

import java.util.Collection;
import java.util.HashSet;

public class NonNullWrappedHashSet<E> extends HashSet<E> {

    private static final long serialVersionUID = 8377161849188229010L;

    public NonNullWrappedHashSet() {}

    public NonNullWrappedHashSet(Collection<? extends E> c) {
        this.addAll(c);
    }

    public NonNullWrappedHashSet(int initialCapacity, float loadFactor) {
        super(initialCapacity, loadFactor);
    }

    public NonNullWrappedHashSet(int initialCapacity) {
        super(initialCapacity);
    }

    @Override
    public boolean add(E e) {
        if (e != null) return super.add(e);
        return false;
    }

    @Override
    public boolean addAll(Collection<? extends E> c) {
        boolean wasChanged = false;
        for (E element : c) {
            if (element != null) wasChanged |= this.add(element);
        }
        return wasChanged;
    }
}