be.pendragon.j2s.seventhcontinent.stats.Statistics.java Source code

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Here is the source code for be.pendragon.j2s.seventhcontinent.stats.Statistics.java

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package be.pendragon.j2s.seventhcontinent.stats;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.IntSummaryStatistics;
import java.util.List;

import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.math3.stat.StatUtils;

/**
 *
 * @author avm
 */
public class Statistics {
    public final double average;
    public final int min;
    public final int max;
    public final long count;
    private final double[] percentiles;

    public Statistics(double average, int min, int max, long count, double[] percentiles) {
        this.average = average;
        this.min = min;
        this.max = max;
        this.count = count;
        this.percentiles = percentiles;
    }

    public double getPercentile(int pct) {
        return percentiles[pct - 1];
    }

    public double[] getPercentiles() {
        return Arrays.copyOf(percentiles, percentiles.length);
    }

    @Override
    public String toString() {
        return String.format("Avg=%f, Min=%d, Max=%d, Count=%d, Pct25=%f, Pct50=%f, Pct75=%f, Pct=%s", average, min,
                max, count, percentiles[24], percentiles[49], percentiles[74], ArrayUtils.toString(percentiles));
    }

    public static class Accumulator {
        private final IntSummaryStatistics intStatsAccumulator;
        private final List<Double> values;

        public Accumulator() {
            this.intStatsAccumulator = new IntSummaryStatistics();
            this.values = new ArrayList<>();
        }

        public void accept(int value) {
            intStatsAccumulator.accept(value);
            values.add((double) value);
        }

        public Statistics compute() {
            double[] percentiles = new double[100];
            final double[] valuesArray = ArrayUtils.toPrimitive(this.values.toArray(new Double[0]));
            for (int pct = 1; pct <= 100; pct++) {
                percentiles[pct - 1] = StatUtils.percentile(valuesArray, pct);
            }
            return new Statistics(intStatsAccumulator.getAverage(), intStatsAccumulator.getMin(),
                    intStatsAccumulator.getMax(), intStatsAccumulator.getCount(), percentiles);
        }
    }

}