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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;
namespace CsvHelper.TypeConversion
{
/// <summary>
/// Converts a <see cref="Nullable{T}"/> to and from a <see cref="string"/>.
/// </summary>
public class NullableConverter : DefaultTypeConverter
{
/// <summary>
/// Gets the type of the nullable.
/// </summary>
/// <value>
/// The type of the nullable.
/// </value>
public Type NullableType { get; private set; }
/// <summary>
/// Gets the underlying type of the nullable.
/// </summary>
/// <value>
/// The underlying type.
/// </value>
public Type UnderlyingType { get; private set; }
/// <summary>
/// Gets the type converter for the underlying type.
/// </summary>
/// <value>
/// The type converter.
/// </value>
public ITypeConverter UnderlyingTypeConverter { get; private set; }
/// <summary>
/// Creates a new <see cref="NullableConverter"/> for the given <see cref="Nullable{T}"/> <see cref="Type"/>.
/// </summary>
/// <param name="type">The nullable type.</param>
/// <param name="typeConverterFactory">The type converter factory.</param>
/// <exception cref="System.ArgumentException">type is not a nullable type.</exception>
public NullableConverter(Type type, TypeConverterCache typeConverterFactory)
{
NullableType = type;
UnderlyingType = Nullable.GetUnderlyingType(type);
if (UnderlyingType == null)
{
throw new ArgumentException("type is not a nullable type.");
}
UnderlyingTypeConverter = typeConverterFactory.GetConverter(UnderlyingType);
}
/// <summary>
/// Converts the string to an object.
/// </summary>
/// <param name="text">The string to convert to an object.</param>
/// <param name="row">The <see cref="IReaderRow"/> for the current record.</param>
/// <param name="memberMapData">The <see cref="MemberMapData"/> for the member being created.</param>
/// <returns>The object created from the string.</returns>
public override object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
{
if (string.IsNullOrEmpty(text))
{
return null;
}
foreach (var nullValue in memberMapData.TypeConverterOptions.NullValues)
{
if (text == nullValue)
{
return null;
}
}
return UnderlyingTypeConverter.ConvertFromString(text, row, memberMapData);
}
/// <summary>
/// Converts the object to a string.
/// </summary>
/// <param name="value">The object to convert to a string.</param>
/// <param name="row"></param>
/// <param name="memberMapData"></param>
/// <returns>The string representation of the object.</returns>
public override string? ConvertToString(object? value, IWriterRow row, MemberMapData memberMapData)
{
return UnderlyingTypeConverter.ConvertToString(value, row, memberMapData);
}
}
}
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