#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2015 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Globalization;
using System.Text;
namespace Google.Protobuf.WellKnownTypes
{
public partial class Timestamp : ICustomDiagnosticMessage, IComparable<Timestamp>
{
private static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
// Constants determined programmatically, but then hard-coded so they can be constant expressions.
private const long BclSecondsAtUnixEpoch = 62135596800;
internal const long UnixSecondsAtBclMaxValue = 253402300799;
internal const long UnixSecondsAtBclMinValue = -BclSecondsAtUnixEpoch;
internal const int MaxNanos = Duration.NanosecondsPerSecond - 1;
private static bool IsNormalized(long seconds, int nanoseconds) =>
nanoseconds >= 0 &&
nanoseconds <= MaxNanos &&
seconds >= UnixSecondsAtBclMinValue &&
seconds <= UnixSecondsAtBclMaxValue;
/// <summary>
/// Returns the difference between one <see cref="Timestamp"/> and another, as a <see cref="Duration"/>.
/// </summary>
/// <param name="lhs">The timestamp to subtract from. Must not be null.</param>
/// <param name="rhs">The timestamp to subtract. Must not be null.</param>
/// <returns>The difference between the two specified timestamps.</returns>
public static Duration operator -(Timestamp lhs, Timestamp rhs)
{
ProtoPreconditions.CheckNotNull(lhs, "lhs");
ProtoPreconditions.CheckNotNull(rhs, "rhs");
checked
{
return Duration.Normalize(lhs.Seconds - rhs.Seconds, lhs.Nanos - rhs.Nanos);
}
}
/// <summary>
/// Adds a <see cref="Duration"/> to a <see cref="Timestamp"/>, to obtain another <c>Timestamp</c>.
/// </summary>
/// <param name="lhs">The timestamp to add the duration to. Must not be null.</param>
/// <param name="rhs">The duration to add. Must not be null.</param>
/// <returns>The result of adding the duration to the timestamp.</returns>
public static Timestamp operator +(Timestamp lhs, Duration rhs)
{
ProtoPreconditions.CheckNotNull(lhs, "lhs");
ProtoPreconditions.CheckNotNull(rhs, "rhs");
checked
{
return Normalize(lhs.Seconds + rhs.Seconds, lhs.Nanos + rhs.Nanos);
}
}
/// <summary>
/// Subtracts a <see cref="Duration"/> from a <see cref="Timestamp"/>, to obtain another <c>Timestamp</c>.
/// </summary>
/// <param name="lhs">The timestamp to subtract the duration from. Must not be null.</param>
/// <param name="rhs">The duration to subtract.</param>
/// <returns>The result of subtracting the duration from the timestamp.</returns>
public static Timestamp operator -(Timestamp lhs, Duration rhs)
{
ProtoPreconditions.CheckNotNull(lhs, "lhs");
ProtoPreconditions.CheckNotNull(rhs, "rhs");
checked
{
return Normalize(lhs.Seconds - rhs.Seconds, lhs.Nanos - rhs.Nanos);
}
}
/// <summary>
/// Converts this timestamp into a <see cref="DateTime"/>.
/// </summary>
/// <remarks>
/// The resulting <c>DateTime</c> will always have a <c>Kind</c> of <c>Utc</c>.
/// If the timestamp is not a precise number of ticks, it will be truncated towards the start
/// of time. For example, a timestamp with a <see cref="Nanos"/> value of 99 will result in a
/// <see cref="DateTime"/> value precisely on a second.
/// </remarks>
/// <returns>This timestamp as a <c>DateTime</c>.</returns>
/// <exception cref="InvalidOperationException">The timestamp contains invalid values; either it is
/// incorrectly normalized or is outside the valid range.</exception>
public DateTime ToDateTime()
{
if (!IsNormalized(Seconds, Nanos))
{
throw new InvalidOperationException(@"Timestamp contains invalid values: Seconds={Seconds}; Nanos={Nanos}");
}
return UnixEpoch.AddSeconds(Seconds).AddTicks(Nanos / Duration.NanosecondsPerTick);
}
/// <summary>
/// Converts this timestamp into a <see cref="DateTimeOffset"/>.
/// </summary>
/// <remarks>
/// The resulting <c>DateTimeOffset</c> will always have an <c>Offset</c> of zero.
/// If the timestamp is not a precise number of ticks, it will be truncated towards the start
/// of time. For example, a timestamp with a <see cref="Nanos"/> value of 99 will result in a
/// <see cref="DateTimeOffset"/> value precisely on a second.
/// </remarks>
/// <returns>This timestamp as a <c>DateTimeOffset</c>.</returns>
/// <exception cref="InvalidOperationException">The timestamp contains invalid values; either it is
/// incorrectly normalized or is outside the valid range.</exception>
public DateTimeOffset ToDateTimeOffset()
{
return new DateTimeOffset(ToDateTime(), TimeSpan.Zero);
}
/// <summary>
/// Converts the specified <see cref="DateTime"/> to a <see cref="Timestamp"/>.
/// </summary>
/// <param name="dateTime"></param>
/// <exception cref="ArgumentException">The <c>Kind</c> of <paramref name="dateTime"/> is not <c>DateTimeKind.Utc</c>.</exception>
/// <returns>The converted timestamp.</returns>
public static Timestamp FromDateTime(DateTime dateTime)
{
if (dateTime.Kind != DateTimeKind.Utc)
{
throw new ArgumentException("Conversion from DateTime to Timestamp requires the DateTime kind to be Utc", "dateTime");
}
// Do the arithmetic using DateTime.Ticks, which is always non-negative, making things simpler.
long secondsSinceBclEpoch = dateTime.Ticks / TimeSpan.TicksPerSecond;
int nanoseconds = (int) (dateTime.Ticks % TimeSpan.TicksPerSecond) * Duration.NanosecondsPerTick;
return new Timestamp { Seconds = secondsSinceBclEpoch - BclSecondsAtUnixEpoch, Nanos = nanoseconds };
}
/// <summary>
/// Converts the given <see cref="DateTimeOffset"/> to a <see cref="Timestamp"/>
/// </summary>
/// <remarks>The offset is taken into consideration when converting the value (so the same instant in time
/// is represented) but is not a separate part of the resulting value. In other words, there is no
/// roundtrip operation to retrieve the original <c>DateTimeOffset</c>.</remarks>
/// <param name="dateTimeOffset">The date and time (with UTC offset) to convert to a timestamp.</param>
/// <returns>The converted timestamp.</returns>
public static Timestamp FromDateTimeOffset(DateTimeOffset dateTimeOffset)
{
// We don't need to worry about this having negative ticks: DateTimeOffset is constrained to handle
// values whose *UTC* value is in the range of DateTime.
return FromDateTime(dateTimeOffset.UtcDateTime);
}
internal static Timestamp Normalize(long seconds, int nanoseconds)
{
int extraSeconds = nanoseconds / Duration.NanosecondsPerSecond;
seconds += extraSeconds;
nanoseconds -= extraSeconds * Duration.NanosecondsPerSecond;
if (nanoseconds < 0)
{
nanoseconds += Duration.NanosecondsPerSecond;
seconds--;
}
return new Timestamp { Seconds = seconds, Nanos = nanoseconds };
}
/// <summary>
/// Converts a timestamp specified in seconds/nanoseconds to a string.
/// </summary>
/// <remarks>
/// If the value is a normalized duration in the range described in <c>timestamp.proto</c>,
/// <paramref name="diagnosticOnly"/> is ignored. Otherwise, if the parameter is <c>true</c>,
/// a JSON object with a warning is returned; if it is <c>false</c>, an <see cref="InvalidOperationException"/> is thrown.
/// </remarks>
/// <param name="seconds">Seconds portion of the duration.</param>
/// <param name="nanoseconds">Nanoseconds portion of the duration.</param>
/// <param name="diagnosticOnly">Determines the handling of non-normalized values</param>
/// <exception cref="InvalidOperationException">The represented duration is invalid, and <paramref name="diagnosticOnly"/> is <c>false</c>.</exception>
internal static string ToJson(long seconds, int nanoseconds, bool diagnosticOnly)
{
if (IsNormalized(seconds, nanoseconds))
{
// Use .NET's formatting for the value down to the second, including an opening double quote (as it's a string value)
DateTime dateTime = UnixEpoch.AddSeconds(seconds);
var builder = new StringBuilder();
builder.Append('"');
builder.Append(dateTime.ToString("yyyy'-'MM'-'dd'T'HH:mm:ss", CultureInfo.InvariantCulture));
Duration.AppendNanoseconds(builder, nanoseconds);
builder.Append("Z\"");
return builder.ToString();
}
if (diagnosticOnly)
{
return string.Format(CultureInfo.InvariantCulture,
"{{ \"@warning\": \"Invalid Timestamp\", \"seconds\": \"{0}\", \"nanos\": {1} }}",
seconds,
nanoseconds);
}
else
{
throw new InvalidOperationException("Non-normalized timestamp value");
}
}
/// <summary>
/// Given another timestamp, returns 0 if the timestamps are equivalent, -1 if this timestamp precedes the other, and 1 otherwise
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="other">Timestamp to compare</param>
/// <returns>an integer indicating whether this timestamp precedes or follows the other</returns>
public int CompareTo(Timestamp other)
{
return other == null ? 1
: Seconds < other.Seconds ? -1
: Seconds > other.Seconds ? 1
: Nanos < other.Nanos ? -1
: Nanos > other.Nanos ? 1
: 0;
}
/// <summary>
/// Compares two timestamps and returns whether the first is less than (chronologically precedes) the second
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if a precedes b</returns>
public static bool operator <(Timestamp a, Timestamp b)
{
return a.CompareTo(b) < 0;
}
/// <summary>
/// Compares two timestamps and returns whether the first is greater than (chronologically follows) the second
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if a follows b</returns>
public static bool operator >(Timestamp a, Timestamp b)
{
return a.CompareTo(b) > 0;
}
/// <summary>
/// Compares two timestamps and returns whether the first is less than (chronologically precedes) the second
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if a precedes b</returns>
public static bool operator <=(Timestamp a, Timestamp b)
{
return a.CompareTo(b) <= 0;
}
/// <summary>
/// Compares two timestamps and returns whether the first is greater than (chronologically follows) the second
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if a follows b</returns>
public static bool operator >=(Timestamp a, Timestamp b)
{
return a.CompareTo(b) >= 0;
}
/// <summary>
/// Returns whether two timestamps are equivalent
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if the two timestamps refer to the same nanosecond</returns>
public static bool operator ==(Timestamp a, Timestamp b)
{
return ReferenceEquals(a, b) || (a is null ? (b is null ? true : false) : a.Equals(b));
}
/// <summary>
/// Returns whether two timestamps differ
/// </summary>
/// <remarks>
/// Make sure the timestamps are normalized. Comparing non-normalized timestamps is not specified and may give unexpected results.
/// </remarks>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns>true if the two timestamps differ</returns>
public static bool operator !=(Timestamp a, Timestamp b)
{
return !(a == b);
}
/// <summary>
/// Returns a string representation of this <see cref="Timestamp"/> for diagnostic purposes.
/// </summary>
/// <remarks>
/// Normally the returned value will be a JSON string value (including leading and trailing quotes) but
/// when the value is non-normalized or out of range, a JSON object representation will be returned
/// instead, including a warning. This is to avoid exceptions being thrown when trying to
/// diagnose problems - the regular JSON formatter will still throw an exception for non-normalized
/// values.
/// </remarks>
/// <returns>A string representation of this value.</returns>
public string ToDiagnosticString()
{
return ToJson(Seconds, Nanos, true);
}
}
}
