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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.Reflection;
namespace CsvHelper.Expressions
{
/// <summary>
/// Base implementation for classes that create records.
/// </summary>
public abstract class RecordCreator
{
private readonly Dictionary<Type, Delegate> createRecordFuncs = new Dictionary<Type, Delegate>();
/// <summary>
/// The reader.
/// </summary>
protected CsvReader Reader { get; private set; }
/// <summary>
/// The expression manager.
/// </summary>
protected ExpressionManager ExpressionManager { get; private set; }
/// <summary>
/// Initializes a new instance using the given reader.
/// </summary>
/// <param name="reader">The reader.</param>
public RecordCreator(CsvReader reader)
{
Reader = reader;
ExpressionManager = new ExpressionManager(reader);
}
/// <summary>
/// Create a record of the given type using the current row.
/// </summary>
/// <typeparam name="T">The record type.</typeparam>
public T Create<T>()
{
try
{
return ((Func<T>)GetCreateRecordDelegate(typeof(T))).Invoke();
}
catch (TargetInvocationException ex)
{
if (ex.InnerException != null)
{
throw ex.InnerException;
}
else
{
throw;
}
}
}
/// <summary>
/// Create a record of the given type using the current row.
/// </summary>
/// <param name="recordType">The record type.</param>
public object? Create(Type recordType)
{
try
{
return GetCreateRecordDelegate(recordType).DynamicInvoke();
}
catch (TargetInvocationException ex)
{
if (ex.InnerException != null)
{
throw ex.InnerException;
}
else
{
throw;
}
}
}
/// <summary>
/// Gets the delegate to create a record for the given record type.
/// If the delegate doesn't exist, one will be created and cached.
/// </summary>
/// <param name="recordType">The record type.</param>
protected virtual Delegate GetCreateRecordDelegate(Type recordType)
{
if (!createRecordFuncs.TryGetValue(recordType, out Delegate func))
{
createRecordFuncs[recordType] = func = CreateCreateRecordDelegate(recordType);
}
return func;
}
/// <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 abstract Delegate CreateCreateRecordDelegate(Type recordType);
}
}
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