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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.Collections;
using System.Collections.ObjectModel;
using System.Linq;
using CsvHelper.Configuration;
namespace CsvHelper.TypeConversion
{
/// <summary>
/// Converts a <see cref="Collection{T}"/> to and from a <see cref="string"/>.
/// </summary>
public class CollectionGenericConverter : IEnumerableConverter
{
/// <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)
{
// Since we're using the MemberType here, this converter can be used for multiple types
// as long as they implement IList.
var list = (IList)ObjectResolver.Current.Resolve(memberMapData.Member.MemberType());
var type = memberMapData.Member.MemberType().GetGenericArguments()[0];
var converter = row.Context.TypeConverterCache.GetConverter(type);
if (memberMapData.IsNameSet || row.Configuration.HasHeaderRecord && !memberMapData.IsIndexSet)
{
// Use the name.
var nameIndex = 0;
while (true)
{
if (!row.TryGetField(type, memberMapData.Names.FirstOrDefault(), nameIndex, out var field))
{
break;
}
list.Add(field);
nameIndex++;
}
}
else
{
// Use the index.
var indexEnd = memberMapData.IndexEnd < memberMapData.Index
? row.Parser.Count - 1
: memberMapData.IndexEnd;
for (var i = memberMapData.Index; i <= indexEnd; i++)
{
var field = converter.ConvertFromString(row.GetField(i), row, memberMapData);
list.Add(field);
}
}
return list;
}
}
}
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