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/*
 * Copyright (c) 2016, Ivan Sokolov. All rights reserved.
 * This code is licensed under MIT license (see LICENSE for details)
 */

package com.github.sirikid.iterators;

import java.util.ListIterator;
import java.util.NoSuchElementException;

/**
 * Empty iterator. Use it when need return an iterator, but you have no elements.
 *
 * @author Ivan Sokolov
 * @version 1.1.0
 * @param  type of elements
 * @see EmptySpliterator
 * @since 1.0.0
 */

public class EmptyIterator implements ListIterator {

	@Override
	public boolean hasNext() {
		return false;
	}

	@Override
	public E next() {
		throw new NoSuchElementException();
	}

	@Override
	public boolean hasPrevious() {
		return false;
	}

	@Override
	public E previous() {
		throw new NoSuchElementException();
	}

	@Override
	public int nextIndex() {
		return 0;
	}

	@Override
	public int previousIndex() {
		return -1;
	}

	@Override
	public void remove() {
		throw new UnsupportedOperationException("remove");
	}

	@Override
	public void set(final E unused) {
		throw new UnsupportedOperationException("set");
	}

	@Override
	public void add(final E unused) {
		throw new UnsupportedOperationException("add");
	}
}