File size: 2,649 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | // Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
using System;
using System.Collections.Generic;
namespace Microsoft.Management.UI.Internal
{
/// <summary>
/// The DateTimeApproximationComparer is responsible for comparing two
/// DateTime objects at a level of precision determined by
/// the first object. The comparison either compares at the
/// date level or the date and time (down to Seconds precision).
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.MSInternal", "CA903:InternalNamespaceShouldNotContainPublicTypes")]
public class DateTimeApproximationComparer : IComparer<DateTime>
{
/// <summary>
/// Compares two objects and returns a value indicating
/// whether one is less than, equal to, or greater than the other.
/// </summary>
/// <param name="value1">
/// The first object to compare.
/// </param>
/// <param name="value2">
/// The second object to compare.
/// </param>
/// <returns>
/// If value1 is less than value2, then a value less than zero is returned.
/// If value1 equals value2, than zero is returned.
/// If value1 is greater than value2, then a value greater than zero is returned.
/// </returns>
public int Compare(DateTime value1, DateTime value2)
{
DateTime roundedX;
DateTime roundedY;
GetRoundedValues(value1, value2, out roundedX, out roundedY);
return roundedX.CompareTo(roundedY);
}
private static void GetRoundedValues(DateTime value1, DateTime value2, out DateTime roundedValue1, out DateTime roundedValue2)
{
roundedValue1 = value1;
roundedValue2 = value2;
bool hasTimeComponent = HasTimeComponent(value1);
int hour = hasTimeComponent ? value1.Hour : value2.Hour;
int minute = hasTimeComponent ? value1.Minute : value2.Minute;
int second = hasTimeComponent ? value1.Second : value2.Second;
roundedValue1 = new DateTime(value1.Year, value1.Month, value1.Day, hour, minute, second);
roundedValue2 = new DateTime(value2.Year, value2.Month, value2.Day, value2.Hour, value2.Minute, value2.Second);
}
private static bool HasTimeComponent(DateTime value)
{
bool hasNoTimeComponent = value.Hour == 0
&& value.Minute == 0
&& value.Second == 0
&& value.Millisecond == 0;
return !hasNoTimeComponent;
}
}
}
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