org.jhotdraw8.icollection.sequenced.ReversedSequencedSetView Maven / Gradle / Ivy

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JHotDraw8 Immutable Collections
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package org.jhotdraw8.icollection.sequenced;


import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.SequencedSet;
import java.util.Spliterator;
import java.util.function.Supplier;

/**
 * Provides a reversed view on a {@link SequencedSet}.
 *
 * @param  the element type
 */
public class ReversedSequencedSetView extends AbstractSet implements SequencedSet {
    private final SequencedSet src;
    private final Supplier> reverseIterator;
    private final Supplier> reverseSpliterator;

    /**
     * Constructs a new instance.
     *
     * @param src                the source set
     * @param reverseIterator    the reverse iterator
     * @param reverseSpliterator the reverse spliterator
     */
    public ReversedSequencedSetView(SequencedSet src,
                                    Supplier> reverseIterator,
                                    Supplier> reverseSpliterator) {
        this.src = src;
        this.reverseIterator = reverseIterator;
        this.reverseSpliterator = reverseSpliterator;
    }

    @Override
    public boolean equals(Object o) {
        return src.equals(o);
    }

    @Override
    public int hashCode() {
        return src.hashCode();
    }

    @Override
    public boolean isEmpty() {
        return src.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return src.contains(o);
    }

    @Override
    public boolean add(E e) {
        if (src.contains(e)) {
            return false;
        }
        src.addFirst(e);
        return true;
    }

    @Override
    public boolean remove(Object o) {
        return src.remove(o);
    }

    @Override
    public boolean containsAll(Collection c) {
        return src.containsAll(c);
    }

    @Override
    public boolean retainAll(Collection c) {
        return src.retainAll(c);
    }

    @Override
    public void clear() {
        src.clear();
    }

    @Override
    public Spliterator spliterator() {
        return reverseSpliterator.get();
    }

    @Override
    public E getFirst() {
        return src.getLast();
    }

    @Override
    public E getLast() {
        return src.getFirst();
    }

    @Override
    public Iterator iterator() {
        return reverseIterator.get();
    }

    @Override
    public int size() {
        return src.size();
    }

    @Override
    public void addFirst(E e) {
        src.addLast(e);
    }

    @Override
    public void addLast(E e) {
        src.addFirst(e);
    }

    @Override
    public E removeFirst() {
        return src.removeLast();
    }

    @Override
    public E removeLast() {
        return src.removeFirst();
    }

    @Override
    public SequencedSet reversed() {
        return src;
    }
}