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//-----------------------------------------------------------------------
// <copyright file="TimestampEncoder.cs" company="Outercurve Foundation">
// Copyright (c) Outercurve Foundation. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
namespace DotNetOpenAuth.Messaging {
using System;
using System.Globalization;
using DotNetOpenAuth.Messaging.Reflection;
/// <summary>
/// Translates between a <see cref="DateTime"/> and the number of seconds between it and 1/1/1970 12 AM
/// </summary>
internal class TimestampEncoder : IMessagePartEncoder {
/// <summary>
/// The reference date and time for calculating time stamps.
/// </summary>
internal static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
/// <summary>
/// Initializes a new instance of the <see cref="TimestampEncoder"/> class.
/// </summary>
public TimestampEncoder() {
}
/// <summary>
/// Encodes the specified value.
/// </summary>
/// <param name="value">The value. Guaranteed to never be null.</param>
/// <returns>
/// The <paramref name="value"/> in string form, ready for message transport.
/// </returns>
public string Encode(object value) {
if (value == null) {
return null;
}
var timestamp = (DateTime)value;
TimeSpan secondsSinceEpoch = timestamp - Epoch;
return ((int)secondsSinceEpoch.TotalSeconds).ToString(CultureInfo.InvariantCulture);
}
/// <summary>
/// Decodes the specified value.
/// </summary>
/// <param name="value">The string value carried by the transport. Guaranteed to never be null, although it may be empty.</param>
/// <returns>
/// The deserialized form of the given string.
/// </returns>
/// <exception cref="FormatException">Thrown when the string value given cannot be decoded into the required object type.</exception>
public object Decode(string value) {
if (value == null) {
return null;
}
var secondsSinceEpoch = int.Parse(value, CultureInfo.InvariantCulture);
return Epoch.AddSeconds(secondsSinceEpoch);
}
}
}
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