source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Axes/DateTime/Strategies/ExtendedDaysStrategy.cs @ 12747

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Microsoft.Research.DynamicDataDisplay.Charts
{
  public class ExtendedDaysStrategy : IDateTimeTicksStrategy
  {
    private static readonly DifferenceIn[] diffs = new DifferenceIn[] { 
      DifferenceIn.Year,
      DifferenceIn.Day,
      DifferenceIn.Hour,
      DifferenceIn.Minute,
      DifferenceIn.Second,
      DifferenceIn.Millisecond
    };

    public DifferenceIn GetDifference(TimeSpan span)
    {
      span = span.Duration();

      DifferenceIn diff;
      if (span.Days > 365)
        diff = DifferenceIn.Year;
      else if (span.Days > 0)
        diff = DifferenceIn.Day;
      else if (span.Hours > 0)
        diff = DifferenceIn.Hour;
      else if (span.Minutes > 0)
        diff = DifferenceIn.Minute;
      else if (span.Seconds > 0)
        diff = DifferenceIn.Second;
      else
        diff = DifferenceIn.Millisecond;

      return diff;
    }

    public bool TryGetLowerDiff(DifferenceIn diff, out DifferenceIn lowerDiff)
    {
      lowerDiff = diff;

      int index = Array.IndexOf(diffs, diff);
      if (index == -1)
        return false;

      if (index == diffs.Length - 1)
        return false;

      lowerDiff = diffs[index + 1];
      return true;
    }

    public bool TryGetBiggerDiff(DifferenceIn diff, out DifferenceIn biggerDiff)
    {
      biggerDiff = diff;

      int index = Array.IndexOf(diffs, diff);
      if (index == -1 || index == 0)
        return false;

      biggerDiff = diffs[index - 1];
      return true;
    }
  }
}