root / trunk / Pithos.Interfaces / PithosDateTimeConverter.cs @ 84b880b5
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#region |
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/* ----------------------------------------------------------------------- |
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* <copyright file="PithosDateTimeConverter.cs" company="GRNet"> |
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* |
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* Copyright 2011-2012 GRNET S.A. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* |
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* THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS |
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR |
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* The views and conclusions contained in the software and |
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* documentation are those of the authors and should not be |
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* interpreted as representing official policies, either expressed |
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* or implied, of GRNET S.A. |
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* </copyright> |
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* ----------------------------------------------------------------------- |
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*/ |
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#endregion |
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using System; |
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using System.Globalization; |
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using Newtonsoft.Json; |
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using Newtonsoft.Json.Converters; |
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using Newtonsoft.Json.Utilities; |
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|
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namespace Pithos.Interfaces |
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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 PithosDateTimeConverter : DateTimeConverterBase |
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{ |
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private DateTime _epoch = new DateTime(1970, 1, 1,0,0,0,DateTimeKind.Utc); |
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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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double seconds; |
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|
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if (value is DateTime) |
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{ |
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var dateTime = (DateTime)value; |
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var utcDateTime = dateTime.ToUniversalTime(); |
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seconds = (utcDateTime - _epoch).TotalSeconds; ; |
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} |
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else if (value is DateTimeOffset) |
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{ |
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var dateTimeOffset = (DateTimeOffset)value; |
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var utcDateTimeOffset = dateTimeOffset.ToUniversalTime(); |
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seconds= (utcDateTimeOffset.UtcDateTime - _epoch).TotalSeconds; |
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} |
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else |
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{ |
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throw new Exception("Expected date object value."); |
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} |
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|
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writer.WriteValue(seconds); |
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} |
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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="existingValue">The existing property value of the JSON that is being converted.</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, object existingValue, JsonSerializer serializer) |
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{ |
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Type t = (IsNullableType(objectType)) |
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? Nullable.GetUnderlyingType(objectType) |
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: objectType; |
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|
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if (reader.TokenType == JsonToken.Null) |
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{ |
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if (!IsNullableType(objectType)) |
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throw new Exception(String.Format("Cannot convert null value to {0}.",objectType)); |
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|
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return null; |
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} |
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|
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var seconds = double.Parse(reader.Value.ToString()); //CultureInfo.InvariantCulture); |
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|
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DateTime d = _epoch.AddSeconds(seconds); |
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|
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|
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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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|
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public static bool IsNullableType(Type t) |
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{ |
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if (t== null) |
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throw new ArgumentNullException("t"); |
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|
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return (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>)); |
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} |
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} |
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} |