apewer-dotnet/Apewer/Externals/Newtonsoft.Json-11.0.1/Linq/JTokenWriter.Async.cs

#region License
// Copyright (c) 2007 James Newton-King
//
// 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.
#endregion

#if HAVE_ASYNC

using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json.Utilities;

namespace Newtonsoft.Json.Linq
{
    internal partial class JTokenWriter
    {
        // This is the only method that can benefit from Task-based asynchronicity, and that only when
        // the reader provides it.
        internal override Task WriteTokenAsync(JsonReader reader, bool writeChildren, bool writeDateConstructorAsDate, bool writeComments, CancellationToken cancellationToken)
        {
            // Since JTokenReader is a common target (and with an optimised path) and since it can't
            // read truly async, catch that case.
            if (reader is JTokenReader)
            {
                WriteToken(reader, writeChildren, writeDateConstructorAsDate, writeComments);
                return AsyncUtils.CompletedTask;
            }

            return WriteTokenSyncReadingAsync(reader, cancellationToken);
        }
    }
}

#endif