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/*

 *	Copyright 2005 stat4j.org

 *

 *   Licensed under the Apache License, Version 2.0 (the "License");

 *   you may not use this file except in compliance with the License.

 *	You may obtain a copy of the License at

 *

 *       http://www.apache.org/licenses/LICENSE-2.0

 *

 *   Unless required by applicable law or agreed to in writing, software

 *   distributed under the License is distributed on an "AS IS" BASIS,

 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 *   See the License for the specific language governing permissions and

 *   limitations under the License.

 */

package net.sourceforge.stat4j.calculators;

import java.util.Properties;

import net.sourceforge.stat4j.Metric;

/**

 * Name:		Average.java

 * Date:		Aug 29, 2004

 * Description:

 * 

 * 

 * @author Lara D'Abreo

 */

public class Average extends CalculatorAdapter {

	protected double totalValue;

	protected long numberOfReadings;

	protected double average;

	/**

	 * 

	 */

	public Average() {

		reset();

	}

	public void applyMetric(Metric metric) {

		double value;

		if (metric.isSingle()) {

			value = metric.getReading(getStatistic().getUnit());

		} else {

			value = metric.getReadingDelta(getStatistic().getUnit());

		}

		setTimestamp(metric.getTimestamp());

		applyValue(value);

	}

	protected void applyValue(double value) {

		totalValue = totalValue + value;

		// inc number of readings

		numberOfReadings = numberOfReadings + 1;

		// calculate average

		average = totalValue / numberOfReadings;

	}

	public double getResult() {

		return average;

	}

	public void reset() {

		this.totalValue = 0.0;

		this.numberOfReadings = 0;

		this.average = 0.0;

	}

	public void init(String name, Properties properties) {

		super.init(name);

	}

}