DistributionComparator.java example

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/*
 * This is eMonocot, a global online biodiversity information resource.
 *
 * Copyright © 2011–2015 The Board of Trustees of the Royal Botanic Gardens, Kew and The University of Oxford
 *
 * eMonocot is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * eMonocot 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 Affero General Public License for more details.
 *
 * The complete text of the GNU Affero General Public License is in the source repository as the file
 * ‘COPYING’.  It is also available from <http://www.gnu.org/licenses/>.
 */
package org.emonocot.model.compare;

import java.util.Comparator;

import org.emonocot.model.Distribution;
import org.emonocot.model.constants.Location;

public class DistributionComparator  implements Comparator<Distribution> {

	Comparator<Location> locationComparator = new LocationComparator();

	@Override
	public int compare(Distribution o1, Distribution o2) {
		if(o1.getLocation() == null) {
			if(o2.getLocation() == null) {
				return 0;
			} else {
				return -1;
			}
		} else {
			if(o2.getLocation() == null) {
				return 1;
			} else {
				return locationComparator.compare(o1.getLocation(), o2.getLocation());
			}
		}
	}

}