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DateTimeConverter.cs
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DateTimeConverter.cs
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// This file is part of YamlDotNet - A .NET library for YAML.
// Copyright (c) Antoine Aubry and contributors
//
// 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.
using System;
using System.Globalization;
using System.Linq;
using YamlDotNet.Core;
using YamlDotNet.Core.Events;
namespace YamlDotNet.Serialization.Converters
{
/// <summary>
/// This represents the YAML converter entity for <see cref="DateTime"/>.
/// </summary>
public class DateTimeConverter : IYamlTypeConverter
{
private readonly DateTimeKind kind;
private readonly IFormatProvider provider;
private readonly bool doubleQuotes;
private readonly string[] formats;
/// <summary>
/// Initializes a new instance of the <see cref="DateTimeConverter"/> class.
/// </summary>
/// <param name="kind"><see cref="DateTimeKind"/> value. Default value is <see cref="DateTimeKind.Utc"/>. <see cref="DateTimeKind.Unspecified"/> is considered as <see cref="DateTimeKind.Utc"/>.</param>
/// <param name="provider"><see cref="IFormatProvider"/> instance. Default value is <see cref="CultureInfo.InvariantCulture"/>.</param>
/// <param name="doubleQuotes">If true, will use double quotes when writing the value to the stream.</param>
/// <param name="formats">List of date/time formats for parsing. Default value is "<c>G</c>".</param>
/// <remarks>On deserializing, all formats in the list are used for conversion, while on serializing, the first format in the list is used.</remarks>
public DateTimeConverter(DateTimeKind kind = DateTimeKind.Utc, IFormatProvider? provider = null, bool doubleQuotes = false, params string[] formats)
{
this.kind = kind == DateTimeKind.Unspecified ? DateTimeKind.Utc : kind;
this.provider = provider ?? CultureInfo.InvariantCulture;
this.doubleQuotes = doubleQuotes;
this.formats = formats.DefaultIfEmpty("G").ToArray();
}
/// <summary>
/// Gets a value indicating whether the current converter supports converting the specified type.
/// </summary>
/// <param name="type"><see cref="Type"/> to check.</param>
/// <returns>Returns <c>True</c>, if the current converter supports; otherwise returns <c>False</c>.</returns>
public bool Accepts(Type type)
{
return type == typeof(DateTime);
}
/// <summary>
/// Reads an object's state from a YAML parser.
/// </summary>
/// <param name="parser"><see cref="IParser"/> instance.</param>
/// <param name="type"><see cref="Type"/> to convert.</param>
/// <returns>Returns the <see cref="DateTime"/> instance converted.</returns>
/// <remarks>On deserializing, all formats in the list are used for conversion.</remarks>
public object ReadYaml(IParser parser, Type type)
{
var value = parser.Consume<Scalar>().Value;
var style = this.kind == DateTimeKind.Local ? DateTimeStyles.AssumeLocal : DateTimeStyles.AssumeUniversal;
var dt = DateTime.ParseExact(value, this.formats, this.provider, style);
dt = EnsureDateTimeKind(dt, this.kind);
return dt;
}
/// <summary>
/// Writes the specified object's state to a YAML emitter.
/// </summary>
/// <param name="emitter"><see cref="IEmitter"/> instance.</param>
/// <param name="value">Value to write.</param>
/// <param name="type"><see cref="Type"/> to convert.</param>
/// <remarks>On serializing, the first format in the list is used.</remarks>
public void WriteYaml(IEmitter emitter, object? value, Type type)
{
var dt = (DateTime)value!;
var adjusted = this.kind == DateTimeKind.Local ? dt.ToLocalTime() : dt.ToUniversalTime();
var formatted = adjusted.ToString(this.formats.First(), this.provider); // Always take the first format of the list.
emitter.Emit(new Scalar(AnchorName.Empty, TagName.Empty, formatted, doubleQuotes ? ScalarStyle.DoubleQuoted : ScalarStyle.Any, true, false));
}
private static DateTime EnsureDateTimeKind(DateTime dt, DateTimeKind kind)
{
DateTime ensured;
if (dt.Kind == DateTimeKind.Local && kind == DateTimeKind.Utc)
{
ensured = dt.ToUniversalTime();
return ensured;
}
if (dt.Kind == DateTimeKind.Utc && kind == DateTimeKind.Local)
{
ensured = dt.ToLocalTime();
return ensured;
}
return dt;
}
}
}