EmptyIterator.java

/**
 * Copyright (C) 2006-2017 INRIA and contributors
 * Spoon - http://spoon.gforge.inria.fr/
 *
 * This software is governed by the CeCILL-C License under French law and
 * abiding by the rules of distribution of free software. You can use, modify
 * and/or redistribute the software under the terms of the CeCILL-C license as
 * circulated by CEA, CNRS and INRIA at http://www.cecill.info.
 *
 * 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 CeCILL-C License for more details.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL-C license and that you accept its terms.
 */
package spoon.support.util;

import java.util.Iterator;
import java.util.NoSuchElementException;

public class EmptyIterator<E> implements Iterator<E> {
	private static final EmptyIterator<Object> EMPTY_ITERATOR = new EmptyIterator<>();

	public static <T> Iterator<T> instance() {
		return (Iterator<T>) EMPTY_ITERATOR;
	}

	EmptyIterator() {
	}

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

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

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