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/* 
 * Copyright (C) 2018 V12 Technology Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * 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
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program.  If not, see 
 * .
 */
package com.fluxtion.ext.streaming.api.group;

/**
 * Math functions for use with GroupBy.
 *
 * @author Greg Higgins
 */
public class AggregateFunctions {
//
//    public static double calcSum(double newValue, double oldSum) {
//        return newValue + oldSum;
//    }
//
    public static double set(double newValue, double oldSum) {
        return newValue;
    }
//
//    public static int count(Object newValue, int oldValue) {
//        oldValue++;
//        return oldValue;
//    }
//
//    public static double minimum(double newValue, double oldValue) {
//        return Math.min(newValue, oldValue);
//    }
//
//    public static double maximum(double newValue, double oldValue) {
//        return Math.max(newValue, oldValue);
//    }
//
//    public static class AggregateAverage implements StatefulNumber {
//
//        private int count;
//        private double sum;
//        private double currentValue;
//
//        public double calcAverage(double newValue, double oldAverage) {
//            count++;
//            sum += newValue;
//            currentValue = sum / count;
//            return currentValue;
//        }
//
//        @Override
//        public void reset() {
//            count = 0;
//            sum = 0;
//            currentValue = Double.NaN;
//        }
//
//        @Override
//        public Number combine(AggregateAverage other, MutableNumber result) {
//            count += other.count;
//            sum += other.sum;
//            currentValue = sum / count;
//            result.set(currentValue);
//            return result;
//        }
//
//        @Override
//        public Number deduct(AggregateAverage other, MutableNumber result) {
//            count -= other.count;
//            sum -= other.sum;
//            currentValue = sum / count;
//            result.set(currentValue);
//            return result;
//        }
//
//        @Override
//        public Number currentValue(MutableNumber result) {
//            result.set(currentValue);
//            return result;
//        }
//    }
//
//    public static class AggregateSum implements StatefulNumber {
//
//        private double sum;
//
//        public double calcCumSum(double newValue, double oldAverage) {
//            sum += newValue;
//            return sum;
//        }
//
//        @Override
//        public void reset() {
//            sum = 0;
//        }
//
//        @Override
//        public Number combine(AggregateSum other, MutableNumber result) {
//            sum += other.sum;
//            result.set(sum);
//            return result;
//        }
//
//        @Override
//        public Number deduct(AggregateSum other, MutableNumber result) {
//            sum -= other.sum;
//            result.set(sum);
//            return result;
//        }
//
//        @Override
//        public Number currentValue(MutableNumber result) {
//            result.set(sum);
//            return result;
//        }
//
//    }
}