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JsonbHandler.cs
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91 lines (81 loc) · 3.79 KB
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#region License
// The PostgreSQL License
//
// Copyright (C) 2018 The Npgsql Development Team
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement is hereby granted, provided that the above copyright notice
// and this paragraph and the following two paragraphs appear in all copies.
//
// IN NO EVENT SHALL THE NPGSQL DEVELOPMENT TEAM BE LIABLE TO ANY PARTY
// FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
// INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
// DOCUMENTATION, EVEN IF THE NPGSQL DEVELOPMENT TEAM HAS BEEN ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
// THE NPGSQL DEVELOPMENT TEAM SPECIFICALLY DISCLAIMS ANY WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
// ON AN "AS IS" BASIS, AND THE NPGSQL DEVELOPMENT TEAM HAS NO OBLIGATIONS
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
#endregion
using System;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Npgsql.BackendMessages;
using Npgsql.TypeHandling;
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
namespace Npgsql.Json.NET
{
public class JsonbHandlerFactory : NpgsqlTypeHandlerFactory<string>
{
protected override NpgsqlTypeHandler<string> Create(NpgsqlConnection conn)
=> new JsonbHandler(conn);
}
class JsonbHandler : Npgsql.TypeHandlers.JsonbHandler
{
public JsonbHandler(NpgsqlConnection connection)
: base(connection) {}
protected override async ValueTask<T> Read<T>(NpgsqlReadBuffer buf, int len, bool async, FieldDescription fieldDescription = null)
{
var s = await base.Read<string>(buf, len, async, fieldDescription);
if (typeof(T) == typeof(string))
return (T)(object)s;
try
{
return JsonConvert.DeserializeObject<T>(s);
}
catch (Exception e)
{
throw new NpgsqlSafeReadException(e);
}
}
public override int ValidateAndGetLength<T2>(T2 value, ref NpgsqlLengthCache lengthCache, NpgsqlParameter parameter)
=> typeof(T2) == typeof(string)
? base.ValidateAndGetLength(value, ref lengthCache, parameter)
: ValidateObjectAndGetLength(value, ref lengthCache, parameter);
protected override Task WriteWithLength<T2>(T2 value, NpgsqlWriteBuffer buf, NpgsqlLengthCache lengthCache, NpgsqlParameter parameter, bool async)
=> typeof(T2) == typeof(string)
? base.WriteWithLength(value, buf, lengthCache, parameter, async)
: WriteObjectWithLength(value, buf, lengthCache, parameter, async);
protected override int ValidateObjectAndGetLength(object value, ref NpgsqlLengthCache lengthCache, NpgsqlParameter parameter)
{
var s = value as string;
if (s == null)
{
s = JsonConvert.SerializeObject(value);
if (parameter != null)
parameter.ConvertedValue = s;
}
return base.ValidateObjectAndGetLength(s, ref lengthCache, parameter);
}
protected override Task WriteObjectWithLength(object value, NpgsqlWriteBuffer buf, NpgsqlLengthCache lengthCache, NpgsqlParameter parameter, bool async)
{
if (parameter?.ConvertedValue != null)
value = parameter.ConvertedValue;
var s = value as string ?? JsonConvert.SerializeObject(value);
return base.WriteObjectWithLength(s, buf, lengthCache, parameter, async);
}
}
}