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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);
        }

}