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// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System;
using CsvHelper.Configuration;
using System.Linq;
namespace CsvHelper.TypeConversion
{
/// <summary>
/// Converts an <see cref="object"/> to and from a <see cref="string"/>.
/// </summary>
public class DefaultTypeConverter : ITypeConverter
{
/// <inheritdoc/>
public virtual object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
{
if (memberMapData.UseDefaultOnConversionFailure && memberMapData.IsDefaultSet && memberMapData.Member.MemberType() == memberMapData.Default?.GetType())
{
return memberMapData.Default;
}
if (!row.Configuration.ExceptionMessagesContainRawData)
{
text = $"Hidden because {nameof(IParserConfiguration.ExceptionMessagesContainRawData)} is false.";
}
text ??= string.Empty;
var message =
$"The conversion cannot be performed.{Environment.NewLine}" +
$" Text: '{text}'{Environment.NewLine}" +
$" MemberName: {memberMapData.Member?.Name}{Environment.NewLine}" +
$" MemberType: {memberMapData.Member?.MemberType().FullName}{Environment.NewLine}" +
$" TypeConverter: '{memberMapData.TypeConverter?.GetType().FullName}'";
throw new TypeConverterException(this, memberMapData, text, row.Context, message);
}
/// <inheritdoc/>
public virtual string? ConvertToString(object? value, IWriterRow row, MemberMapData memberMapData)
{
if (value == null)
{
if (memberMapData.TypeConverterOptions.NullValues.Count > 0)
{
return memberMapData.TypeConverterOptions.NullValues.First();
}
return string.Empty;
}
if (value is IFormattable formattable)
{
var format = memberMapData.TypeConverterOptions.Formats?.FirstOrDefault();
return formattable.ToString(format, memberMapData.TypeConverterOptions.CultureInfo);
}
return value?.ToString() ?? string.Empty;
}
}
}
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