/*
 * Southampton University Map App
 * Copyright (C) 2011  Christopher Baines
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package net.cbaines.suma;

import java.util.Comparator;

import org.osmdroid.util.GeoPoint;

public class POIDistanceComparator implements Comparator<POI> {
	private final GeoPoint userLocation;
	private final boolean useExistingData;

	public POIDistanceComparator(GeoPoint userLocation) {
		this(userLocation, false);
	}

	public POIDistanceComparator(GeoPoint userLocation, boolean useData) {
		super();
		this.userLocation = userLocation;
		this.useExistingData = useData;
	}

	public int compare(POI poi1, POI poi2) {
		if (poi1.distTo == -1 || !useExistingData) {
			poi1.distTo = userLocation.distanceTo(poi1.point);
		}
		if (poi2.distTo == -1 || !useExistingData) {
			poi2.distTo = userLocation.distanceTo(poi2.point);
		}
		return poi1.distTo - poi2.distTo;
	}

}