#region
/* -----------------------------------------------------------------------
*
*
* Copyright 2011-2012 GRNET S.A. All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* 2. 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.
*
*
* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A 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
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* interpreted as representing official policies, either expressed
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* -----------------------------------------------------------------------
*/
#endregion
using System;
using System.Globalization;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Utilities;
namespace Pithos.Interfaces
{
///
/// Converts a to and from a JavaScript date constructor (e.g. new Date(52231943)).
///
public class PithosDateTimeConverter : DateTimeConverterBase
{
private DateTime _epoch = new DateTime(1970, 1, 1,0,0,0,DateTimeKind.Utc);
///
/// Writes the JSON representation of the object.
///
/// The to write to.
/// The value.
/// The calling serializer.
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
double seconds;
if (value is DateTime)
{
var dateTime = (DateTime)value;
var utcDateTime = dateTime.ToUniversalTime();
seconds = (utcDateTime - _epoch).TotalSeconds; ;
}
else if (value is DateTimeOffset)
{
var dateTimeOffset = (DateTimeOffset)value;
var utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
seconds= (utcDateTimeOffset.UtcDateTime - _epoch).TotalSeconds;
}
else
{
throw new Exception("Expected date object value.");
}
writer.WriteValue(seconds);
}
///
/// Reads the JSON representation of the object.
///
/// The to read from.
/// Type of the object.
/// The existing property value of the JSON that is being converted.
/// The calling serializer.
/// The object value.
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Type t = (IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (reader.TokenType == JsonToken.Null)
{
if (!IsNullableType(objectType))
throw new Exception(String.Format("Cannot convert null value to {0}.",objectType));
return null;
}
var seconds = double.Parse((string)reader.Value,CultureInfo.InvariantCulture);
DateTime d = _epoch.AddSeconds(seconds);
if (t == typeof(DateTimeOffset))
return new DateTimeOffset(d);
return d;
}
public static bool IsNullableType(Type t)
{
if (t== null)
throw new ArgumentNullException("t");
return (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>));
}
}
}