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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.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;
using CsvHelper.Configuration;
using CsvHelper.Configuration.Attributes;
namespace CsvHelper
{
/// <summary>
/// Common reflection tasks.
/// </summary>
internal static class ReflectionHelper
{
/// <summary>
/// Gets the <see cref="PropertyInfo"/> from the type where the property was declared.
/// </summary>
/// <param name="type">The type the property belongs to.</param>
/// <param name="property">The property to search.</param>
/// <param name="flags">Flags for how the property is retrieved.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static PropertyInfo GetDeclaringProperty(Type type, PropertyInfo property, BindingFlags flags)
{
if (property.DeclaringType != type)
{
var declaringProperty = property.DeclaringType.GetProperty(property.Name, flags);
return GetDeclaringProperty(property.DeclaringType, declaringProperty, flags);
}
return property;
}
/// <summary>
/// Gets the <see cref="FieldInfo"/> from the type where the field was declared.
/// </summary>
/// <param name="type">The type the field belongs to.</param>
/// <param name="field">The field to search.</param>
/// <param name="flags">Flags for how the field is retrieved.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static FieldInfo GetDeclaringField(Type type, FieldInfo field, BindingFlags flags)
{
if (field.DeclaringType != type)
{
var declaringField = field.DeclaringType.GetField(field.Name, flags);
return GetDeclaringField(field.DeclaringType, declaringField, flags);
}
return field;
}
/// <summary>
/// Walk up the inheritance tree collecting properties. This will get a unique set of properties in the
/// case where parents have the same property names as children.
/// </summary>
/// <param name="type">The <see cref="Type"/> to get properties for.</param>
/// <param name="flags">The flags for getting the properties.</param>
/// <param name="overwrite">If true, parent class properties that are hidden by `new` child properties will be overwritten.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static List<PropertyInfo> GetUniqueProperties(Type type, BindingFlags flags, bool overwrite = false)
{
var ignoreBase = type.GetCustomAttribute(typeof(IgnoreBaseAttribute)) != null;
var properties = new Dictionary<string, PropertyInfo>();
flags |= BindingFlags.DeclaredOnly;
var currentType = type;
while (currentType != null)
{
var currentProperties = currentType.GetProperties(flags);
foreach (var property in currentProperties)
{
if (!properties.ContainsKey(property.Name) || overwrite)
{
properties[property.Name] = property;
}
}
if (ignoreBase)
{
break;
}
currentType = currentType.BaseType;
}
return properties.Values.ToList();
}
/// <summary>
/// Walk up the inheritance tree collecting fields. This will get a unique set of fields in the
/// case where parents have the same field names as children.
/// </summary>
/// <param name="type">The <see cref="Type"/> to get fields for.</param>
/// <param name="flags">The flags for getting the fields.</param>
/// <param name="overwrite">If true, parent class fields that are hidden by `new` child fields will be overwritten.</param>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static List<FieldInfo> GetUniqueFields(Type type, BindingFlags flags, bool overwrite = false)
{
var ignoreBase = type.GetCustomAttribute(typeof(IgnoreBaseAttribute)) != null;
var fields = new Dictionary<string, FieldInfo>();
flags |= BindingFlags.DeclaredOnly;
var currentType = type;
while (currentType != null)
{
var currentFields = currentType.GetFields(flags);
foreach (var field in currentFields)
{
if (!fields.ContainsKey(field.Name) || overwrite)
{
fields[field.Name] = field;
}
}
if (ignoreBase)
{
break;
}
currentType = currentType.BaseType;
}
return fields.Values.ToList();
}
/// <summary>
/// Gets the property from the expression.
/// </summary>
/// <typeparam name="TModel">The type of the model.</typeparam>
/// <typeparam name="TProperty">The type of the property.</typeparam>
/// <param name="expression">The expression.</param>
/// <returns>The <see cref="PropertyInfo"/> for the expression.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static MemberInfo GetMember<TModel, TProperty>(Expression<Func<TModel, TProperty>> expression)
{
var member = GetMemberExpression(expression.Body).Member;
var property = member as PropertyInfo;
if (property != null)
{
return property;
}
var field = member as FieldInfo;
if (field != null)
{
return field;
}
throw new ConfigurationException($"'{member.Name}' is not a member.");
}
/// <summary>
/// Gets the member inheritance chain as a stack.
/// </summary>
/// <typeparam name="TModel">The type of the model.</typeparam>
/// <typeparam name="TProperty">The type of the property.</typeparam>
/// <param name="expression">The member expression.</param>
/// <returns>The inheritance chain for the given member expression as a stack.</returns>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static Stack<MemberInfo> GetMembers<TModel, TProperty>(Expression<Func<TModel, TProperty>> expression)
{
var stack = new Stack<MemberInfo>();
var currentExpression = expression.Body;
while (true)
{
var memberExpression = GetMemberExpression(currentExpression);
if (memberExpression == null)
{
break;
}
stack.Push(memberExpression.Member);
currentExpression = memberExpression.Expression;
}
return stack;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static MemberExpression? GetMemberExpression(Expression expression)
{
MemberExpression? memberExpression = null;
if (expression.NodeType == ExpressionType.Convert)
{
var body = (UnaryExpression)expression;
memberExpression = body.Operand as MemberExpression;
}
else if (expression.NodeType == ExpressionType.MemberAccess)
{
memberExpression = expression as MemberExpression;
}
return memberExpression;
}
}
}
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