/*
 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
 * 
 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
 * Virtual Machine, which is developed at Christian Doppler Laboratory on
 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
 * contact us at <http://mevss.jku.at/> if you need additional information
 * or have any questions.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
 *
 */ 
package sun.evtracing.processing.statistics;

public class NumberStatistic {
	public static NumberStatistic merge(NumberStatistic x, NumberStatistic y) {
		NumberStatistic s = new NumberStatistic();
		s.max = Math.max(x.max, y.max);
		s.count = x.count + y.count;
		s.sum = x.sum + y.sum;
		return s;
	}

	private long max;
	private long sum;
	private long count;

	public long getSum() {
		return sum;
	}

	public double getAverage() {
		if (count > 0) {
			return sum / count;
		} else {
			return Double.NaN;
		}
	}

	public long getMax() {
		return max;
	}

	public void add(long value) {
		max = Math.max(max, value);
		sum += value;
		count++;
	}
}