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• AbstractSlidingAverage.java

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org.vesalainen.math.sliding.AbstractSlidingAverage Maven / Gradle / Ivy

/*
 * Copyright (C) 2016 tkv
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.vesalainen.math.sliding;

import java.util.Arrays;
import java.util.function.DoubleConsumer;
import java.util.stream.DoubleStream;

/**
 * Base class for sliding average calculation
 * @author tkv
 */
public abstract class AbstractSlidingAverage extends AbstractSliding implements DoubleConsumer, ValueArray, Average
{
    protected double[] ring;
    protected double sum;
    /**
     * Creates an AbstractSlidingAverage
     * @param size Initial size of the ring buffer
     */
    protected AbstractSlidingAverage(int size)
    {
        super(size);
        ring = new double[size];
    }
    /**
     * Adds new value to sliding average
     * @param value 
     */
    @Override
    public void accept(double value)
    {
        eliminate();
        int count = end-begin;
        if (count >= size-margin)
        {
            grow();
        }
        assign(end%size, value);
        end++;
    }
            
    @Override
    protected void assign(int index, double value)
    {
        ring[index] = value;
        sum += value;
    }

    @Override
    protected void remove(int index)
    {
        sum -= ring[index];
    }

    /**
     * Returns average without actually calculating cell by cell
     * @return 
     */
    @Override
    public double fast()
    {
        return sum/(end-begin);
    }

    /**
     * Returns average by calculating cell by cell
     * @return 
     */
    @Override
    public double average()
    {
        double s = 0;
        for (int ii=begin;ii