view flys-artifacts/src/main/java/de/intevation/flys/utils/DateAverager.java @ 3406:3732e1bab0aa

Add kilometer to chart titles flys-artifacts/trunk@5058 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Christian Lins <christian.lins@intevation.de>
date Thu, 19 Jul 2012 11:40:59 +0000
parents d520a0869972
children
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package de.intevation.flys.utils;

import gnu.trove.TLongArrayList;

import java.util.Date;

public class DateAverager
{
   protected TLongArrayList dates;

    public DateAverager() {
        dates = new TLongArrayList();
    }

    public void add(Date date) {
        dates.add(date.getTime());
    }

    public Date getAverage() {
        int N = dates.size();
        if (N == 0) {
            return null;
        }
        long min = dates.min();
        long sum = 0L;
        for (int i = 0; i < N; ++i) {
            sum += dates.getQuick(i) - min;
        }
        return new Date(min + (long)Math.round(sum/(double)N));
    }

    public void clear() {
        dates.resetQuick();
    }
}
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