fr.lirmm.boreal.util.stream.CloseableIteratorAdapter Maven / Gradle / Ivy

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/*
 * Copyright (C) Inria Sophia Antipolis - Méditerranée / LIRMM
 * (Universit� de Montpellier & CNRS) (2014 - 2017)
 *
 * Contributors :
 *
 * Clément SIPIETER 
 * Mélanie KONIG
 * Swan ROCHER
 * Jean-François BAGET
 * Michel LECLERE
 * Marie-Laure MUGNIER 
 *
 *
 * This file is part of Graal .
 *
 * This software is governed by the CeCILL 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
 * license as circulated by CEA, CNRS and INRIA at the following URL
 * "http://www.cecill.info".
 *
 * As a counterpart to the access to the source code and rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty and the software's author, the holder of the
 * economic rights, and the successive licensors have only limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading, using, modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean that it is complicated to manipulate, and that also
 * therefore means that it is reserved for developers and experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and, more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL license and that you accept its terms.
 */
package fr.lirmm.boreal.util.stream;

import java.io.Closeable;
import java.io.IOException;
import java.util.Iterator;

/**
 * @author Clément Sipieter (INRIA) {@literal }
 * @param  type of elements of the iterator
 *
 */
public class CloseableIteratorAdapter implements CloseableIteratorWithoutException {

	private Iterator iterator;
	private boolean isClosed = false;

	/**
	 * @param iterator iterator to wrap
	 */
	public CloseableIteratorAdapter(Iterator iterator) {
		this.iterator = iterator;
	}

	@Override
	public boolean hasNext() {
		if (isClosed) {
			return false;
		}
		return this.iterator.hasNext();
	}

	@Override
	public T next() {
		if (isClosed) {
			return null;
		}
		return this.iterator.next();
	}

	@Override
	public void close() {
		this.isClosed = true;
		if (iterator instanceof Closeable) {
			try {
				((Closeable) iterator).close();
			} catch (IOException e) {
				throw new Error("Untreated exception", e);
			}
		}
	}

}