BlockIterator.java

/**
 * Copyright 2004-2016 Riccardo Solmi. All rights reserved.
 * This file is part of the Whole Platform.
 *
 * The Whole Platform is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The Whole Platform 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
 */
package org.whole.lang.iterators;

import org.whole.lang.model.IEntity;

/**
 * @author Riccardo Solmi
 */
public class BlockIterator<E extends IEntity> extends SequenceIterator<E> {
	protected BlockIterator(IEntityIterator<? extends E>... iteratorChain) {
		super(iteratorChain);
	}

	@Override
	public E next() {
		E result;
		do {
			result = super.next();
		} while (!inLastIterator());
		return result;
	}

	@Override
	public E lookahead() {
		E result;
		while ((result = super.lookahead()) != null && !inLastIterator())
			super.next();
		return result;
	}

	protected boolean inLastIterator() {
		return iteratorIndex == iteratorChain.length-1;
	}
}