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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 System.Collections.Generic;
using System.Linq.Expressions;
namespace CsvHelper.Expressions
{
/// <summary>
/// Creates objects.
/// </summary>
public class ObjectRecordCreator : RecordCreator
{
/// <summary>
/// Initializes a new instance using the given reader.
/// </summary>
/// <param name="reader"></param>
public ObjectRecordCreator(CsvReader reader) : base(reader) { }
/// <summary>
/// Creates a <see cref="Delegate"/> of type <see cref="Func{T}"/>
/// that will create a record of the given type using the current
/// reader row.
/// </summary>
/// <param name="recordType">The record type.</param>
protected override Delegate CreateCreateRecordDelegate(Type recordType)
{
if (Reader.Context.Maps[recordType] == null)
{
Reader.Context.Maps.Add(Reader.Context.AutoMap(recordType));
}
var map = Reader.Context.Maps[recordType];
Expression body;
if (map.ParameterMaps.Count > 0)
{
// This is a constructor parameter type.
var arguments = new List<Expression>();
ExpressionManager.CreateConstructorArgumentExpressionsForMapping(map, arguments);
var args = new GetConstructorArgs(map.ClassType);
body = Expression.New(Reader.Configuration.GetConstructor(args), arguments);
}
else
{
var assignments = new List<MemberAssignment>();
ExpressionManager.CreateMemberAssignmentsForMapping(map, assignments);
if (assignments.Count == 0)
{
throw new ReaderException(Reader.Context, $"No members are mapped for type '{recordType.FullName}'.");
}
body = ExpressionManager.CreateInstanceAndAssignMembers(recordType, assignments);
}
var funcType = typeof(Func<>).MakeGenericType(recordType);
return Expression.Lambda(funcType, body).Compile();
}
}
}
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