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#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
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
namespace Google.Protobuf.WellKnownTypes
{
// Manually-written partial class for the Duration well-known type,
// providing a conversion to TimeSpan and convenience operators.
public partial class Duration
{
/// <summary>
/// The number of nanoseconds in a second.
/// </summary>
public const int NanosecondsPerSecond = 1000000000;
/// <summary>
/// The number of nanoseconds in a BCL tick (as used by <see cref="TimeSpan"/> and <see cref="DateTime"/>).
/// </summary>
public const int NanosecondsPerTick = 100;
/// <summary>
/// The maximum permitted number of seconds.
/// </summary>
public const long MaxSeconds = 315576000000L;
/// <summary>
/// The minimum permitted number of seconds.
/// </summary>
public const long MinSeconds = -315576000000L;
internal const int MaxNanoseconds = NanosecondsPerSecond - 1;
internal const int MinNanoseconds = -NanosecondsPerSecond + 1;
internal static bool IsNormalized(long seconds, int nanoseconds)
{
// Simple boundaries
if (seconds < MinSeconds || seconds > MaxSeconds ||
nanoseconds < MinNanoseconds || nanoseconds > MaxNanoseconds)
{
return false;
}
// We only have a problem is one is strictly negative and the other is
// strictly positive.
return Math.Sign(seconds) * Math.Sign(nanoseconds) != -1;
}
/// <summary>
/// Converts this <see cref="Duration"/> to a <see cref="TimeSpan"/>.
/// </summary>
/// <remarks>If the duration is not a precise number of ticks, it is truncated towards 0.</remarks>
/// <returns>The value of this duration, as a <c>TimeSpan</c>.</returns>
/// <exception cref="InvalidOperationException">This value isn't a valid normalized duration, as
/// described in the documentation.</exception>
public TimeSpan ToTimeSpan()
{
checked
{
if (!IsNormalized(Seconds, Nanos))
{
throw new InvalidOperationException("Duration was not a valid normalized duration");
}
long ticks = Seconds * TimeSpan.TicksPerSecond + Nanos / NanosecondsPerTick;
return TimeSpan.FromTicks(ticks);
}
}
/// <summary>
/// Converts the given <see cref="TimeSpan"/> to a <see cref="Duration"/>.
/// </summary>
/// <param name="timeSpan">The <c>TimeSpan</c> to convert.</param>
/// <returns>The value of the given <c>TimeSpan</c>, as a <c>Duration</c>.</returns>
public static Duration FromTimeSpan(TimeSpan timeSpan)
{
checked
{
long ticks = timeSpan.Ticks;
long seconds = ticks / TimeSpan.TicksPerSecond;
int nanos = (int) (ticks % TimeSpan.TicksPerSecond) * NanosecondsPerTick;
return new Duration { Seconds = seconds, Nanos = nanos };
}
}
/// <summary>
/// Returns the result of negating the duration. For example, the negation of 5 minutes is -5 minutes.
/// </summary>
/// <param name="value">The duration to negate. Must not be null.</param>
/// <returns>The negated value of this duration.</returns>
public static Duration operator -(Duration value)
{
Preconditions.CheckNotNull(value, "value");
checked
{
return Normalize(-value.Seconds, -value.Nanos);
}
}
/// <summary>
/// Adds the two specified <see cref="Duration"/> values together.
/// </summary>
/// <param name="lhs">The first value to add. Must not be null.</param>
/// <param name="rhs">The second value to add. Must not be null.</param>
/// <returns></returns>
public static Duration operator +(Duration lhs, Duration rhs)
{
Preconditions.CheckNotNull(lhs, "lhs");
Preconditions.CheckNotNull(rhs, "rhs");
checked
{
return Normalize(lhs.Seconds + rhs.Seconds, lhs.Nanos + rhs.Nanos);
}
}
/// <summary>
/// Subtracts one <see cref="Duration"/> from another.
/// </summary>
/// <param name="lhs">The duration to subtract from. Must not be null.</param>
/// <param name="rhs">The duration to subtract. Must not be null.</param>
/// <returns>The difference between the two specified durations.</returns>
public static Duration operator -(Duration lhs, Duration rhs)
{
Preconditions.CheckNotNull(lhs, "lhs");
Preconditions.CheckNotNull(rhs, "rhs");
checked
{
return Normalize(lhs.Seconds - rhs.Seconds, lhs.Nanos - rhs.Nanos);
}
}
/// <summary>
/// Creates a duration with the normalized values from the given number of seconds and
/// nanoseconds, conforming with the description in the proto file.
/// </summary>
internal static Duration Normalize(long seconds, int nanoseconds)
{
// Ensure that nanoseconds is in the range (-1,000,000,000, +1,000,000,000)
int extraSeconds = nanoseconds / NanosecondsPerSecond;
seconds += extraSeconds;
nanoseconds -= extraSeconds * NanosecondsPerSecond;
// Now make sure that Sign(seconds) == Sign(nanoseconds) if Sign(seconds) != 0.
if (seconds < 0 && nanoseconds > 0)
{
seconds += 1;
nanoseconds -= NanosecondsPerSecond;
}
else if (seconds > 0 && nanoseconds < 0)
{
seconds -= 1;
nanoseconds += NanosecondsPerSecond;
}
return new Duration { Seconds = seconds, Nanos = nanoseconds };
}
}
}
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