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Datastructures and utility classes for non-negative integers

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/*
 * Copyright (C) 2017 Tobias Meggendorfer
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package de.tum.in.naturals.set;

import it.unimi.dsi.fastutil.ints.IntBidirectionalIterator;

public class ReverseIntBidiIterator implements IntBidirectionalIterator {
    private final IntBidirectionalIterator iterator;

    public ReverseIntBidiIterator(IntBidirectionalIterator iterator) {
        this.iterator = iterator;
    }

    @Override
    public int back(int n) {
        return iterator.skip(n);
    }

    @Override
    public boolean hasNext() {
        return iterator.hasPrevious();
    }

    @Override
    public boolean hasPrevious() {
        return iterator.hasNext();
    }

    @Override
    public int nextInt() {
        return iterator.previousInt();
    }

    @Override
    public int previousInt() {
        return iterator.nextInt();
    }

    @Override
    public int skip(int n) {
        return iterator.back(n);
    }
}