using System;
using System.Globalization;
using Newtonsoft.Json.Utilities;
namespace Newtonsoft.Json.Converters{
/// <summary>
/// Converts a <see cref="DateTime"/> to and from a JavaScript date constructor (e.g. new Date(52231943)).
/// </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>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
long ticks;
if (value is DateTime)
{
DateTime dateTime = (DateTime)value;
DateTime utcDateTime = dateTime.ToUniversalTime();
ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTime);
}
#if !PocketPC && !NET20
else if (value is DateTimeOffset)
{
DateTimeOffset dateTimeOffset = (DateTimeOffset)value;
DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);
}
#endif
else
{
throw new Exception("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>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Type t = (ReflectionUtils.IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (reader.TokenType == JsonToken.Null)
{
if (!ReflectionUtils.IsNullableType(objectType))
throw new Exception("Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
return null;
}
if (reader.TokenType != JsonToken.StartConstructor || string.Compare(reader.Value.ToString(), "Date", StringComparison.Ordinal) != 0)
throw new Exception("Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
reader.Read();
if (reader.TokenType != JsonToken.Integer)
throw new Exception("Unexpected token parsing date. Expected Integer, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
long ticks = (long)reader.Value;
DateTime d = JsonConvert.ConvertJavaScriptTicksToDateTime(ticks);
reader.Read();
if (reader.TokenType != JsonToken.EndConstructor)
throw new Exception("Unexpected token parsing date. Expected EndConstructor, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
#if !PocketPC && !NET20
if (t == typeof(DateTimeOffset))
return new DateTimeOffset(d);
#endif
return d;
}
}
}
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