csharp-sdk-upm/Libs/Newtonsoft.Json/Converters/JavaScriptDateTimeConverter.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Globalization;
using LC.Newtonsoft.Json.Utilities;
namespace LC.Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="DateTime"/> to and from a JavaScript <c>Date</c> constructor (e.g. <c>new Date(52231943)</c>).
/// </summary>
public class JavaScriptDateTimeConverter : DateTimeConverterBase
{
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
long ticks;
if (value is DateTime dateTime)
{
DateTime utcDateTime = dateTime.ToUniversalTime();
ticks = DateTimeUtils.ConvertDateTimeToJavaScriptTicks(utcDateTime);
}
#if HAVE_DATE_TIME_OFFSET
else if (value is DateTimeOffset dateTimeOffset)
{
DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
ticks = DateTimeUtils.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);
}
#endif
else
{
throw new JsonSerializationException("Expected date object value.");
}
writer.WriteStartConstructor("Date");
writer.WriteValue(ticks);
writer.WriteEndConstructor();
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing property value of the JSON that is being converted.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
if (reader.TokenType == JsonToken.Null)
{
if (!ReflectionUtils.IsNullable(objectType))
{
throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
}
return null;
}
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if (reader.TokenType != JsonToken.StartConstructor || !string.Equals(reader.Value.ToString(), "Date", StringComparison.Ordinal))
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{
throw JsonSerializationException.Create(reader, "Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
}
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if (!JavaScriptUtils.TryGetDateFromConstructorJson(reader, out DateTime d, out string errorMessage))
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{
throw JsonSerializationException.Create(reader, errorMessage);
}
#if HAVE_DATE_TIME_OFFSET
Type t = (ReflectionUtils.IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (t == typeof(DateTimeOffset))
{
return new DateTimeOffset(d);
}
#endif
return d;
}
}
}