I2.java

/*
 *  This file is part of the Haven & Hearth game client.
 *  Copyright (C) 2009 Fredrik Tolf <fredrik@dolda2000.com>, and
 *                     Björn Johannessen <johannessen.bjorn@gmail.com>
 *
 *  Redistribution and/or modification of this file is subject to the
 *  terms of the GNU Lesser General Public License, version 3, as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *  Other parts of this source tree adhere to other copying
 *  rights. Please see the file `COPYING' in the root directory of the
 *  source tree for details.
 *
 *  A copy the GNU Lesser General Public License is distributed along
 *  with the source tree of which this file is a part in the file
 *  `doc/LPGL-3'. If it is missing for any reason, please see the Free
 *  Software Foundation's website at <http://www.fsf.org/>, or write
 *  to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 *  Boston, MA 02111-1307 USA
 */

package haven;

import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class I2<T> implements Iterator<T> {
	private Iterator<Iterator<T>> is;
	private Iterator<T> cur;
	private T co;
	private boolean hco;

	public I2(Iterator<T>... is) {
		this.is = Arrays.asList(is).iterator();
		f();
	}

	public I2(Collection<Iterator<T>> is) {
		this.is = is.iterator();
		f();
	}

	private void f() {
		while (true) {
			if ((cur != null) && cur.hasNext()) {
				co = cur.next();
				hco = true;
				return;
			}
			if (is.hasNext()) {
				cur = is.next();
				continue;
			}
			hco = false;
			return;
		}
	}

	public boolean hasNext() {
		return (hco);
	}

	public T next() {
		if (!hco)
			throw (new NoSuchElementException());
		T ret = co;
		f();
		return (ret);
	}

	public void remove() {
		throw (new UnsupportedOperationException());
	}
}