PrioQueue.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.*;

public class PrioQueue<E extends Prioritized> extends LinkedList<E> {
    public E peek() {
	E rv = null;
	int mp = 0;
	for(E e : this) {
	    int ep = e.priority();
	    if((rv == null) || (ep > mp)) {
		mp = ep;
		rv = e;
	    }
	}
	return(rv);
    }
    
    public E element() {
	E rv;
	if((rv = peek()) == null)
	    throw(new NoSuchElementException());
	return(rv);
    }
    
    public E poll() {
	E rv = peek();
	remove(rv);
	return(rv);
    }
    
    public E remove() {
	E rv;
	if((rv = poll()) == null)
	    throw(new NoSuchElementException());
	return(rv);
    }
}