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DefaultJsonTypeInfoResolver.Helpers.cs
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DefaultJsonTypeInfoResolver.Helpers.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text.Json.Reflection;
namespace System.Text.Json.Serialization.Metadata
{
public partial class DefaultJsonTypeInfoResolver
{
internal static MemberAccessor MemberAccessor
{
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
get
{
return s_memberAccessor ??=
#if NETCOREAPP
// if dynamic code isn't supported, fallback to reflection
RuntimeFeature.IsDynamicCodeSupported ?
new ReflectionEmitCachingMemberAccessor() :
new ReflectionMemberAccessor();
#elif NETFRAMEWORK
new ReflectionEmitCachingMemberAccessor();
#else
new ReflectionMemberAccessor();
#endif
}
}
private static MemberAccessor? s_memberAccessor;
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static JsonTypeInfo CreateTypeInfoCore(Type type, JsonConverter converter, JsonSerializerOptions options)
{
JsonTypeInfo typeInfo = JsonTypeInfo.CreateJsonTypeInfo(type, converter, options);
typeInfo.NumberHandling = GetNumberHandlingForType(typeInfo.Type);
typeInfo.PreferredPropertyObjectCreationHandling = GetObjectCreationHandlingForType(typeInfo.Type);
if (typeInfo.Kind == JsonTypeInfoKind.Object)
{
typeInfo.UnmappedMemberHandling = GetUnmappedMemberHandling(typeInfo.Type);
}
typeInfo.PopulatePolymorphismMetadata();
typeInfo.MapInterfaceTypesToCallbacks();
Func<object>? createObject = MemberAccessor.CreateConstructor(typeInfo.Type);
typeInfo.SetCreateObjectIfCompatible(createObject);
typeInfo.CreateObjectForExtensionDataProperty = createObject;
if (typeInfo.Kind is JsonTypeInfoKind.Object)
{
PopulateProperties(typeInfo);
if (converter.ConstructorIsParameterized)
{
PopulateParameterInfoValues(typeInfo);
}
}
// Plug in any converter configuration -- should be run last.
converter.ConfigureJsonTypeInfo(typeInfo, options);
converter.ConfigureJsonTypeInfoUsingReflection(typeInfo, options);
return typeInfo;
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static void PopulateProperties(JsonTypeInfo typeInfo)
{
Debug.Assert(!typeInfo.IsReadOnly);
Debug.Assert(typeInfo.Kind is JsonTypeInfoKind.Object);
// Compiler adds RequiredMemberAttribute to type if any of the members is marked with 'required' keyword.
// SetsRequiredMembersAttribute means that all required members are assigned by constructor and therefore there is no enforcement
bool shouldCheckMembersForRequiredMemberAttribute =
typeInfo.Type.HasRequiredMemberAttribute()
&& !(typeInfo.Converter.ConstructorInfo?.HasSetsRequiredMembersAttribute() ?? false);
JsonTypeInfo.PropertyHierarchyResolutionState state = new();
// Walk the type hierarchy starting from the current type up to the base type(s)
foreach (Type currentType in typeInfo.Type.GetSortedTypeHierarchy())
{
if (currentType == JsonTypeInfo.ObjectType)
{
// Don't process any members for typeof(object)
break;
}
AddMembersDeclaredBySuperType(
typeInfo,
currentType,
shouldCheckMembersForRequiredMemberAttribute,
ref state);
}
if (state.IsPropertyOrderSpecified)
{
typeInfo.PropertyList.SortProperties();
}
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static void AddMembersDeclaredBySuperType(
JsonTypeInfo typeInfo,
Type currentType,
bool shouldCheckMembersForRequiredMemberAttribute,
ref JsonTypeInfo.PropertyHierarchyResolutionState state)
{
Debug.Assert(!typeInfo.IsReadOnly);
Debug.Assert(currentType.IsAssignableFrom(typeInfo.Type));
const BindingFlags BindingFlags =
BindingFlags.Instance |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.DeclaredOnly;
PropertyInfo[] properties = currentType.GetProperties(BindingFlags);
foreach (PropertyInfo propertyInfo in properties)
{
string propertyName = propertyInfo.Name;
// Ignore indexers and virtual properties that have overrides that were [JsonIgnore]d.
if (propertyInfo.GetIndexParameters().Length > 0 ||
PropertyIsOverriddenAndIgnored(propertyName, propertyInfo.PropertyType, propertyInfo.IsVirtual(), state.IgnoredProperties))
{
continue;
}
// For now we only support public properties (i.e. setter and/or getter is public).
if (propertyInfo.GetMethod?.IsPublic == true ||
propertyInfo.SetMethod?.IsPublic == true)
{
AddMember(
typeInfo,
typeToConvert: propertyInfo.PropertyType,
memberInfo: propertyInfo,
shouldCheckMembersForRequiredMemberAttribute,
ref state);
}
else
{
if (propertyInfo.GetCustomAttribute<JsonIncludeAttribute>(inherit: false) != null)
{
ThrowHelper.ThrowInvalidOperationException_JsonIncludeOnNonPublicInvalid(propertyName, currentType);
}
// Non-public properties should not be included for (de)serialization.
}
}
foreach (FieldInfo fieldInfo in currentType.GetFields(BindingFlags))
{
string fieldName = fieldInfo.Name;
if (PropertyIsOverriddenAndIgnored(fieldName, fieldInfo.FieldType, currentMemberIsVirtual: false, state.IgnoredProperties))
{
continue;
}
bool hasJsonInclude = fieldInfo.GetCustomAttribute<JsonIncludeAttribute>(inherit: false) != null;
if (fieldInfo.IsPublic)
{
if (hasJsonInclude || typeInfo.Options.IncludeFields)
{
AddMember(
typeInfo,
typeToConvert: fieldInfo.FieldType,
memberInfo: fieldInfo,
shouldCheckMembersForRequiredMemberAttribute,
ref state);
}
}
else
{
if (hasJsonInclude)
{
ThrowHelper.ThrowInvalidOperationException_JsonIncludeOnNonPublicInvalid(fieldName, currentType);
}
// Non-public fields should not be included for (de)serialization.
}
}
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static void AddMember(
JsonTypeInfo typeInfo,
Type typeToConvert,
MemberInfo memberInfo,
bool shouldCheckForRequiredKeyword,
ref JsonTypeInfo.PropertyHierarchyResolutionState state)
{
JsonPropertyInfo? jsonPropertyInfo = CreatePropertyInfo(typeInfo, typeToConvert, memberInfo, typeInfo.Options, shouldCheckForRequiredKeyword);
if (jsonPropertyInfo == null)
{
// ignored invalid property
return;
}
Debug.Assert(jsonPropertyInfo.Name != null);
typeInfo.PropertyList.AddPropertyWithConflictResolution(jsonPropertyInfo, ref state);
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static JsonPropertyInfo? CreatePropertyInfo(
JsonTypeInfo typeInfo,
Type typeToConvert,
MemberInfo memberInfo,
JsonSerializerOptions options,
bool shouldCheckForRequiredKeyword)
{
JsonIgnoreCondition? ignoreCondition = memberInfo.GetCustomAttribute<JsonIgnoreAttribute>(inherit: false)?.Condition;
if (JsonTypeInfo.IsInvalidForSerialization(typeToConvert))
{
if (ignoreCondition == JsonIgnoreCondition.Always)
return null;
ThrowHelper.ThrowInvalidOperationException_CannotSerializeInvalidType(typeToConvert, memberInfo.DeclaringType, memberInfo);
}
// Resolve any custom converters on the attribute level.
JsonConverter? customConverter;
try
{
customConverter = GetCustomConverterForMember(typeToConvert, memberInfo, options);
}
catch (InvalidOperationException) when (ignoreCondition == JsonIgnoreCondition.Always)
{
// skip property altogether if attribute is invalid and the property is ignored
return null;
}
JsonPropertyInfo jsonPropertyInfo = typeInfo.CreatePropertyUsingReflection(typeToConvert);
PopulatePropertyInfo(jsonPropertyInfo, memberInfo, customConverter, ignoreCondition, shouldCheckForRequiredKeyword);
return jsonPropertyInfo;
}
private static JsonNumberHandling? GetNumberHandlingForType(Type type)
{
JsonNumberHandlingAttribute? numberHandlingAttribute = type.GetUniqueCustomAttribute<JsonNumberHandlingAttribute>(inherit: false);
return numberHandlingAttribute?.Handling;
}
private static JsonObjectCreationHandling? GetObjectCreationHandlingForType(Type type)
{
JsonObjectCreationHandlingAttribute? creationHandlingAttribute = type.GetUniqueCustomAttribute<JsonObjectCreationHandlingAttribute>(inherit: false);
return creationHandlingAttribute?.Handling;
}
private static JsonUnmappedMemberHandling? GetUnmappedMemberHandling(Type type)
{
JsonUnmappedMemberHandlingAttribute? numberHandlingAttribute = type.GetUniqueCustomAttribute<JsonUnmappedMemberHandlingAttribute>(inherit: false);
return numberHandlingAttribute?.UnmappedMemberHandling;
}
private static bool PropertyIsOverriddenAndIgnored(
string currentMemberName,
Type currentMemberType,
bool currentMemberIsVirtual,
Dictionary<string, JsonPropertyInfo>? ignoredMembers)
{
if (ignoredMembers == null || !ignoredMembers.TryGetValue(currentMemberName, out JsonPropertyInfo? ignoredMember))
{
return false;
}
return currentMemberType == ignoredMember.PropertyType &&
currentMemberIsVirtual &&
ignoredMember.IsVirtual;
}
private static void PopulateParameterInfoValues(JsonTypeInfo typeInfo)
{
Debug.Assert(typeInfo.Converter.ConstructorInfo != null);
ParameterInfo[] parameters = typeInfo.Converter.ConstructorInfo.GetParameters();
int parameterCount = parameters.Length;
JsonParameterInfoValues[] jsonParameters = new JsonParameterInfoValues[parameterCount];
for (int i = 0; i < parameterCount; i++)
{
ParameterInfo reflectionInfo = parameters[i];
// Trimmed parameter names are reported as null in CoreCLR or "" in Mono.
if (string.IsNullOrEmpty(reflectionInfo.Name))
{
Debug.Assert(typeInfo.Converter.ConstructorInfo.DeclaringType != null);
ThrowHelper.ThrowNotSupportedException_ConstructorContainsNullParameterNames(typeInfo.Converter.ConstructorInfo.DeclaringType);
}
JsonParameterInfoValues jsonInfo = new()
{
Name = reflectionInfo.Name,
ParameterType = reflectionInfo.ParameterType,
Position = reflectionInfo.Position,
HasDefaultValue = reflectionInfo.HasDefaultValue,
DefaultValue = reflectionInfo.GetDefaultValue()
};
jsonParameters[i] = jsonInfo;
}
typeInfo.ParameterInfoValues = jsonParameters;
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
private static void PopulatePropertyInfo(JsonPropertyInfo jsonPropertyInfo, MemberInfo memberInfo, JsonConverter? customConverter, JsonIgnoreCondition? ignoreCondition, bool shouldCheckForRequiredKeyword)
{
Debug.Assert(jsonPropertyInfo.AttributeProvider == null);
switch (jsonPropertyInfo.AttributeProvider = memberInfo)
{
case PropertyInfo propertyInfo:
jsonPropertyInfo.MemberName = propertyInfo.Name;
jsonPropertyInfo.IsVirtual = propertyInfo.IsVirtual();
jsonPropertyInfo.MemberType = MemberTypes.Property;
break;
case FieldInfo fieldInfo:
jsonPropertyInfo.MemberName = fieldInfo.Name;
jsonPropertyInfo.MemberType = MemberTypes.Field;
break;
default:
Debug.Fail("Only FieldInfo and PropertyInfo members are supported.");
break;
}
jsonPropertyInfo.CustomConverter = customConverter;
DeterminePropertyPolicies(jsonPropertyInfo, memberInfo);
DeterminePropertyName(jsonPropertyInfo, memberInfo);
DeterminePropertyIsRequired(jsonPropertyInfo, memberInfo, shouldCheckForRequiredKeyword);
if (ignoreCondition != JsonIgnoreCondition.Always)
{
jsonPropertyInfo.DetermineReflectionPropertyAccessors(memberInfo);
}
jsonPropertyInfo.IgnoreCondition = ignoreCondition;
jsonPropertyInfo.IsExtensionData = memberInfo.GetCustomAttribute<JsonExtensionDataAttribute>(inherit: false) != null;
}
private static void DeterminePropertyPolicies(JsonPropertyInfo propertyInfo, MemberInfo memberInfo)
{
JsonPropertyOrderAttribute? orderAttr = memberInfo.GetCustomAttribute<JsonPropertyOrderAttribute>(inherit: false);
propertyInfo.Order = orderAttr?.Order ?? 0;
JsonNumberHandlingAttribute? numberHandlingAttr = memberInfo.GetCustomAttribute<JsonNumberHandlingAttribute>(inherit: false);
propertyInfo.NumberHandling = numberHandlingAttr?.Handling;
JsonObjectCreationHandlingAttribute? objectCreationHandlingAttr = memberInfo.GetCustomAttribute<JsonObjectCreationHandlingAttribute>(inherit: false);
propertyInfo.ObjectCreationHandling = objectCreationHandlingAttr?.Handling;
}
private static void DeterminePropertyName(JsonPropertyInfo propertyInfo, MemberInfo memberInfo)
{
JsonPropertyNameAttribute? nameAttribute = memberInfo.GetCustomAttribute<JsonPropertyNameAttribute>(inherit: false);
string? name;
if (nameAttribute != null)
{
name = nameAttribute.Name;
}
else if (propertyInfo.Options.PropertyNamingPolicy != null)
{
name = propertyInfo.Options.PropertyNamingPolicy.ConvertName(memberInfo.Name);
}
else
{
name = memberInfo.Name;
}
if (name == null)
{
ThrowHelper.ThrowInvalidOperationException_SerializerPropertyNameNull(propertyInfo);
}
propertyInfo.Name = name;
}
private static void DeterminePropertyIsRequired(JsonPropertyInfo propertyInfo, MemberInfo memberInfo, bool shouldCheckForRequiredKeyword)
{
propertyInfo.IsRequired =
memberInfo.GetCustomAttribute<JsonRequiredAttribute>(inherit: false) != null
|| (shouldCheckForRequiredKeyword && memberInfo.HasRequiredMemberAttribute());
}
[RequiresUnreferencedCode(JsonSerializer.SerializationUnreferencedCodeMessage)]
[RequiresDynamicCode(JsonSerializer.SerializationRequiresDynamicCodeMessage)]
internal static void DeterminePropertyAccessors<T>(JsonPropertyInfo<T> jsonPropertyInfo, MemberInfo memberInfo)
{
Debug.Assert(memberInfo is FieldInfo or PropertyInfo);
switch (memberInfo)
{
case PropertyInfo propertyInfo:
bool useNonPublicAccessors = propertyInfo.GetCustomAttribute<JsonIncludeAttribute>(inherit: false) != null;
MethodInfo? getMethod = propertyInfo.GetMethod;
if (getMethod != null && (getMethod.IsPublic || useNonPublicAccessors))
{
jsonPropertyInfo.Get = MemberAccessor.CreatePropertyGetter<T>(propertyInfo);
}
MethodInfo? setMethod = propertyInfo.SetMethod;
if (setMethod != null && (setMethod.IsPublic || useNonPublicAccessors))
{
jsonPropertyInfo.Set = MemberAccessor.CreatePropertySetter<T>(propertyInfo);
}
break;
case FieldInfo fieldInfo:
Debug.Assert(fieldInfo.IsPublic);
jsonPropertyInfo.Get = MemberAccessor.CreateFieldGetter<T>(fieldInfo);
if (!fieldInfo.IsInitOnly)
{
jsonPropertyInfo.Set = MemberAccessor.CreateFieldSetter<T>(fieldInfo);
}
break;
default:
Debug.Fail($"Invalid MemberInfo type: {memberInfo.MemberType}");
break;
}
}
}
}