PeriodAnalysisDataPointComparator.java

/**
 * VStar: a statistical analysis tool for variable star data.
 * Copyright (C) 2010  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.period.dcdft;

import java.util.Comparator;

/**
 * This class compares period analysis data point instances. We focus upon
 * equality here.
 */
public class PeriodAnalysisDataPointComparator implements
		Comparator<PeriodAnalysisDataPoint> {

	/**
	 * Singleton instance.
	 */
	public static final PeriodAnalysisDataPointComparator instance = new PeriodAnalysisDataPointComparator();

	private PeriodAnalysisDataPointComparator() {

	}

	/**
	 * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
	 */
	@Override
	public int compare(PeriodAnalysisDataPoint a, PeriodAnalysisDataPoint b) {
		return a.equals(b) ? 0 : 1;
	}
}