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JsonHandler.cs
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75 lines (63 loc) · 3.13 KB
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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 JsonHandlerFactory : NpgsqlTypeHandlerFactory<string>
{
readonly JsonSerializerSettings _settings;
public JsonHandlerFactory(JsonSerializerSettings settings) => _settings = settings;
protected override NpgsqlTypeHandler<string> Create(NpgsqlConnection conn)
=> new JsonHandler(conn, _settings);
}
class JsonHandler : Npgsql.TypeHandlers.TextHandler
{
readonly JsonSerializerSettings _settings;
public JsonHandler(NpgsqlConnection connection, JsonSerializerSettings settings) : base(connection) => _settings = settings;
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, _settings);
}
catch (Exception e)
{
throw new NpgsqlSafeReadException(e);
}
}
protected 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, _settings);
if (parameter != null)
parameter.ConvertedValue = s;
}
return base.ValidateAndGetLength(s, ref lengthCache, parameter);
}
protected override Task WriteObjectWithLength(object value, NpgsqlWriteBuffer buf, NpgsqlLengthCache lengthCache, NpgsqlParameter parameter, bool async)
{
if (value == null || value is DBNull)
return base.WriteObjectWithLength(value, buf, lengthCache, parameter, async);
if (parameter?.ConvertedValue != null)
value = parameter.ConvertedValue;
var s = value as string ?? JsonConvert.SerializeObject(value, _settings);
return base.WriteObjectWithLength(s, buf, lengthCache, parameter, async);
}
}
}