PreviousCyclePhaseComparator.java

/**
 * VStar: a statistical analysis tool for variable star data.
 * Copyright (C) 2009  AAVSO (http://www.aavso.org/)
 *
 * This program 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.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */
package org.aavso.tools.vstar.util.comparator;

import java.util.Comparator;

import org.aavso.tools.vstar.data.ValidObservation;

/**
 * This comparator provides the basis of an ordering over observations
 * based upon Previous Cycle Phase. 
 */
public class PreviousCyclePhaseComparator implements Comparator<ValidObservation> {

	public static final PreviousCyclePhaseComparator instance = new PreviousCyclePhaseComparator();
	
	public int compare(ValidObservation o1, ValidObservation o2) {
		return Double.compare(o1.getPreviousCyclePhase(), o2.getPreviousCyclePhase());
	}
}