105 lines
3.8 KiB
C#
105 lines
3.8 KiB
C#
using System;
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using System.Globalization;
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using Newtonsoft.Json.Utilities;
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namespace Newtonsoft.Json.Converters
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{
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/// <summary>
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/// Converts a <see cref="DateTime"/> to and from a JavaScript date constructor (e.g. new Date(52231943)).
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/// </summary>
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public class JavaScriptDateTimeConverter : JsonConverter
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{
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/// <summary>
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/// Writes the JSON representation of the object.
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/// </summary>
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/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
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/// <param name="value">The value.</param>
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/// <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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{
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long ticks;
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if (value is DateTime)
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{
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DateTime dateTime = (DateTime)value;
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DateTime utcDateTime = dateTime.ToUniversalTime();
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ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTime);
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}
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else
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{
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DateTimeOffset dateTimeOffset = (DateTimeOffset)value;
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DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
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ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);
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}
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writer.WriteStartConstructor("Date");
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writer.WriteValue(ticks);
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writer.WriteEndConstructor();
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}
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/// <summary>
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/// Reads the JSON representation of the object.
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/// </summary>
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/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
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/// <param name="objectType">Type of the object.</param>
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/// <param name="serializer">The calling serializer.</param>
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/// <returns>The object value.</returns>
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public override object ReadJson(JsonReader reader, Type objectType, JsonSerializer serializer)
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{
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Type t = (ReflectionUtils.IsNullableType(objectType))
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? Nullable.GetUnderlyingType(objectType)
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: objectType;
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if (reader.TokenType == JsonToken.Null)
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{
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if (!ReflectionUtils.IsNullableType(objectType))
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throw new Exception("Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
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return null;
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}
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if (reader.TokenType != JsonToken.StartConstructor || string.Compare(reader.Value.ToString(), "Date", StringComparison.Ordinal) != 0)
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throw new Exception("Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
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reader.Read();
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if (reader.TokenType != JsonToken.Integer)
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throw new Exception("Unexpected token parsing date. Expected Integer, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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long ticks = (long)reader.Value;
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DateTime d = JsonConvert.ConvertJavaScriptTicksToDateTime(ticks);
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reader.Read();
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if (reader.TokenType != JsonToken.EndConstructor)
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throw new Exception("Unexpected token parsing date. Expected EndConstructor, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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if (t == typeof(DateTimeOffset))
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return new DateTimeOffset(d);
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return d;
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}
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/// <summary>
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/// Determines whether this instance can convert the specified object type.
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/// </summary>
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/// <param name="objectType">Type of the object.</param>
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/// <returns>
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/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
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/// </returns>
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public override bool CanConvert(Type objectType)
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{
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Type t = (ReflectionUtils.IsNullableType(objectType))
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? Nullable.GetUnderlyingType(objectType)
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: objectType;
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if (typeof(DateTime).IsAssignableFrom(t))
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return true;
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if (typeof(DateTimeOffset).IsAssignableFrom(t))
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return true;
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return false;
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}
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}
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} |