/*
 * 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.aggregator;

import java.util.Map;

import sun.evtracing.processing.statistics.NumberStatistic;
import sun.evtracing.processing.statistics.metadata.Contention;

public abstract class Aggregator implements ContentionProcessor {
	private final AggregatorFactory<? extends Aggregator> factory;
	private final NumberStatistic statistic;
	
	public Aggregator(AggregatorFactory<? extends Aggregator> factory) {
		this.factory = factory;
		statistic = new NumberStatistic();
	}

	public Aggregator(Aggregator x, Aggregator y) {
		assert x.factory == y.factory;
		factory = x.factory;

		statistic = NumberStatistic.merge(x.statistic, y.statistic);
	}

	public AggregatorFactory<? extends Aggregator> factory() {
		return factory;
	}

	public NumberStatistic statistic() {
		return statistic;
	}

	@Override
	public void submit(Contention c) {
		statistic.add(c.duration);
		submitToChildren(c);
	}

	public abstract void submitToChildren(Contention c);

	@Override
	public abstract void merge();

	public abstract Map<?, Aggregator> children();
	
	public abstract <R> R accept(AggregatorVisitor<R> v, Object element);
}