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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;
using System.Reflection;
namespace CsvHelper.Configuration
{
/// <summary>
/// Collection that holds CsvClassMaps for record types.
/// </summary>
public class ClassMapCollection
{
private readonly Dictionary<Type, ClassMap> data = new Dictionary<Type, ClassMap>();
private readonly CsvContext context;
/// <summary>
/// Gets the <see cref="ClassMap"/> for the specified record type.
/// </summary>
/// <value>
/// The <see cref="ClassMap"/>.
/// </value>
/// <param name="type">The record type.</param>
/// <returns>The <see cref="ClassMap"/> for the specified record type.</returns>
public virtual ClassMap? this[Type type]
{
get
{
// Go up the inheritance tree to find the matching type.
// We can't use IsAssignableFrom because both a child
// and it's parent/grandparent/etc could be mapped.
var currentType = type;
while (true)
{
if (data.TryGetValue(currentType, out var map))
{
return map;
}
currentType = currentType.GetTypeInfo().BaseType;
if (currentType == null)
{
return null;
}
}
}
}
/// <summary>
/// Creates a new instance using the given configuration.
/// </summary>
/// <param name="context">The context.</param>
public ClassMapCollection(CsvContext context)
{
this.context = context;
}
/// <summary>
/// Finds the <see cref="ClassMap"/> for the specified record type.
/// </summary>
/// <typeparam name="T">The record type.</typeparam>
/// <returns>The <see cref="ClassMap"/> for the specified record type.</returns>
public virtual ClassMap<T>? Find<T>()
{
return (ClassMap<T>?)this[typeof(T)];
}
/// <summary>
/// Adds the specified map for it's record type. If a map
/// already exists for the record type, the specified
/// map will replace it.
/// </summary>
/// <param name="map">The map.</param>
internal virtual void Add(ClassMap map)
{
SetMapDefaults(map);
var type = GetGenericCsvClassMapType(map.GetType()).GetGenericArguments().First();
data[type] = map;
}
/// <summary>
/// Removes the class map.
/// </summary>
/// <param name="classMapType">The class map type.</param>
internal virtual void Remove(Type classMapType)
{
if (!typeof(ClassMap).IsAssignableFrom(classMapType))
{
throw new ArgumentException("The class map type must inherit from CsvClassMap.");
}
var type = GetGenericCsvClassMapType(classMapType).GetGenericArguments().First();
data.Remove(type);
}
/// <summary>
/// Removes all maps.
/// </summary>
internal virtual void Clear()
{
data.Clear();
}
/// <summary>
/// Goes up the inheritance tree to find the type instance of CsvClassMap{}.
/// </summary>
/// <param name="type">The type to traverse.</param>
/// <returns>The type that is CsvClassMap{}.</returns>
private Type GetGenericCsvClassMapType(Type type)
{
if (type.GetTypeInfo().IsGenericType && type.GetGenericTypeDefinition() == typeof(ClassMap<>))
{
return type;
}
return GetGenericCsvClassMapType(type.GetTypeInfo().BaseType);
}
/// <summary>
/// Sets defaults for the mapping tree. The defaults used
/// to be set inside the classes, but this didn't allow for
/// the TypeConverter to be created from the Configuration's
/// TypeConverterFactory.
/// </summary>
/// <param name="map">The map to set defaults on.</param>
private void SetMapDefaults(ClassMap map)
{
foreach (var parameterMap in map.ParameterMaps)
{
if (parameterMap.ConstructorTypeMap != null)
{
SetMapDefaults(parameterMap.ConstructorTypeMap);
}
else if (parameterMap.ReferenceMap != null)
{
SetMapDefaults(parameterMap.ReferenceMap.Data.Mapping);
}
else
{
if (parameterMap.Data.TypeConverter == null)
{
parameterMap.Data.TypeConverter = context.TypeConverterCache.GetConverter(parameterMap.Data.Parameter.ParameterType);
}
if (parameterMap.Data.Names.Count == 0)
{
parameterMap.Data.Names.Add(parameterMap.Data.Parameter.Name);
}
}
}
foreach (var memberMap in map.MemberMaps)
{
if (memberMap.Data.Member == null)
{
continue;
}
if (memberMap.Data.TypeConverter == null && memberMap.Data.ReadingConvertExpression == null && memberMap.Data.WritingConvertExpression == null)
{
memberMap.Data.TypeConverter = context.TypeConverterCache.GetConverter(memberMap.Data.Member.MemberType());
}
if (memberMap.Data.Names.Count == 0)
{
memberMap.Data.Names.Add(memberMap.Data.Member.Name);
}
}
foreach (var referenceMap in map.ReferenceMaps)
{
SetMapDefaults(referenceMap.Data.Mapping);
if (context.Configuration.ReferenceHeaderPrefix != null)
{
var args = new ReferenceHeaderPrefixArgs(referenceMap.Data.Member.MemberType(), referenceMap.Data.Member.Name);
referenceMap.Data.Prefix = context.Configuration.ReferenceHeaderPrefix(args);
}
}
}
}
}
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