package eu.ztsh.lfr.model;

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.DoubleAdder;

public class YearDataAccumulator {

    private final DoubleAdder sum = new DoubleAdder();
    private final AtomicInteger counter = new AtomicInteger();

    public void add(double value) {
        synchronized (this) {
            sum.add(value);
            counter.incrementAndGet();
        }
    }

    public BigDecimal getAverage() {
        return BigDecimal.valueOf(sum.sum()).setScale(2, RoundingMode.HALF_UP)
            .divide(BigDecimal.valueOf(counter.get()), RoundingMode.HALF_UP);
    }

}