EM_Task/CoreUObject/Private/UObject/Field.cpp

// Copyright Epic Games, Inc. All Rights Reserved.

/*=============================================================================
Field.cpp: Defines FField property system fundamentals
=============================================================================*/

#include "UObject/Field.h"
#include "UObject/Class.h"
#include "HAL/ThreadSafeBool.h"
#include "Misc/ScopeLock.h"
#include "Misc/StringBuilder.h"
#include "Serialization/MemoryWriter.h"
#include "Misc/ConfigCacheIni.h"
#include "Misc/OutputDeviceHelper.h"
#include "Misc/FeedbackContext.h"
#include "Misc/OutputDeviceConsole.h"
#include "UObject/ErrorException.h"
#include "Modules/ModuleManager.h"
#include "UObject/UObjectAllocator.h"
#include "UObject/UObjectHash.h"
#include "UObject/UObjectIterator.h"
#include "UObject/Package.h"
#include "UObject/MetaData.h"
#include "Templates/Casts.h"
#include "UObject/DebugSerializationFlags.h"
#include "UObject/PropertyTag.h"
#include "UObject/UnrealType.h"
#include "UObject/UnrealTypePrivate.h"
#include "UObject/Stack.h"
#include "Misc/PackageName.h"
#include "UObject/ObjectResource.h"
#include "UObject/LinkerSave.h"
#include "UObject/Interface.h"
#include "Misc/HotReloadInterface.h"
#include "UObject/LinkerPlaceholderClass.h"
#include "UObject/LinkerPlaceholderFunction.h"
#include "UObject/StructScriptLoader.h"
#include "UObject/PropertyHelper.h"
#include "UObject/CoreRedirects.h"
#include "Serialization/ArchiveScriptReferenceCollector.h"
#include "UObject/FrameworkObjectVersion.h"
#include "UObject/WeakFieldPtr.h"
#include "Templates/SubclassOf.h"
#include "UObject/TextProperty.h"
#include "UObject/EnumProperty.h"

// WARNING: This should always be the last include in any file that needs it (except .generated.h)
#include "UObject/UndefineUPropertyMacros.h"

FFieldClass::FFieldClass(const TCHAR* InCPPName, uint64 InId, uint64 InCastFlags, FFieldClass* InSuperClass, FField* (*ConstructFnPtr)(const FFieldVariant&, const FName&, EObjectFlags))
    : Id(InId), CastFlags(InCastFlags), ClassFlags(CLASS_None), SuperClass(InSuperClass), DefaultObject(nullptr), ConstructFn(ConstructFnPtr)
{
    check(InCPPName);
    // Skip the 'F' prefix for the name
    check(InCPPName[0] == 'F');
    Name = ++InCPPName;

    GetAllFieldClasses().Add(this);
    GetNameToFieldClassMap().Add(Name, this);
}

FFieldClass::~FFieldClass()
{
    delete DefaultObject;
    DefaultObject = nullptr;
}

TArray<FFieldClass*>& FFieldClass::GetAllFieldClasses()
{
    static TArray<FFieldClass*> AllClasses;
    return AllClasses;
}
TMap<FName, FFieldClass*>& FFieldClass::GetNameToFieldClassMap()
{
    static TMap<FName, FFieldClass*> NameToFieldClassMap;
    return NameToFieldClassMap;
}

FField* FFieldClass::ConstructDefaultObject()
{
    FField* NewDefault = Construct(UClass::StaticClass()->GetOutermost(), *FString::Printf(TEXT("Default__%s"), *GetName()), RF_Transient | RF_ClassDefaultObject);
    return NewDefault;
}

FString FFieldClass::GetDescription() const
{
    return GetName();
}

FText FFieldClass::GetDisplayNameText() const
{
    return FText::FromString(GetName());
}

FArchive& operator<<(FArchive& Ar, FFieldClass*& InOutFieldClass)
{
    FName ClassName = InOutFieldClass ? InOutFieldClass->GetFName() : NAME_None;
    Ar << ClassName;
    if (Ar.IsLoading())
    {
        if (ClassName != NAME_None)
        {
            InOutFieldClass = FFieldClass::GetNameToFieldClassMap().FindRef(ClassName);
        }
        else
        {
            InOutFieldClass = nullptr;
        }
    }
    return Ar;
}

FFieldVariant FFieldVariant::GetOwnerVariant() const
{
    if (bIsUObject)
    {
        return Container.Object->GetOuter();
    }
    else
    {
        return Container.Field->GetOwnerVariant();
    }
}

bool FFieldVariant::IsA(const UClass* InClass) const
{
    return bIsUObject && Container.Object && Container.Object->IsA(InClass);
}
bool FFieldVariant::IsA(const FFieldClass* InClass) const
{
    return !bIsUObject && Container.Field && Container.Field->IsA(InClass);
}

UClass* FFieldVariant::GetOwnerClass() const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return CastChecked<UField>(Container.Object)->GetOwnerClass();
    }
    else
    {
        return Container.Field->GetOwnerClass();
    }
}

FString FFieldVariant::GetFullName() const
{
    if (bIsUObject)
    {
        return Container.Object->GetFullName();
    }
    else
    {
        return Container.Field->GetFullName();
    }
}

FString FFieldVariant::GetPathName() const
{
    if (bIsUObject)
    {
        return Container.Object->GetPathName();
    }
    else
    {
        return Container.Field->GetPathName();
    }
}

FString FFieldVariant::GetName() const
{
    if (bIsUObject)
    {
        return Container.Object->GetName();
    }
    else
    {
        return Container.Field->GetName();
    }
}

FName FFieldVariant::GetFName() const
{
    if (bIsUObject)
    {
        return Container.Object->GetFName();
    }
    else
    {
        return Container.Field->GetFName();
    }
}

FString FFieldVariant::GetClassName() const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return Container.Object->GetClass()->GetName();
    }
    else
    {
        return Container.Field->GetClass()->GetName();
    }
}

bool FFieldVariant::IsNative() const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return Container.Object->IsNative();
    }
    else
    {
        return Container.Field->IsNative();
    }
}

UPackage* FFieldVariant::GetOutermost() const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return Container.Object->GetOutermost();
    }
    else
    {
        return Container.Field->GetOutermost();
    }
}

bool FFieldVariant::IsValidLowLevel() const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return Container.Object->IsValidLowLevel();
    }
    else
    {
        return !!Container.Field;
    }
}

#if WITH_EDITORONLY_DATA
bool FFieldVariant::HasMetaData(const FName& Key) const
{
    check(Container.Object);
    if (bIsUObject)
    {
        return CastChecked<UField>(Container.Object)->HasMetaData(Key);
    }
    else
    {
        return Container.Field->HasMetaData(Key);
    }
}
#endif  // WITH_EDITORONLY_DATA

FArchive& operator<<(FArchive& Ar, FFieldVariant& InOutField)
{
    Ar << InOutField.bIsUObject;
    if (InOutField.bIsUObject)
    {
        Ar << InOutField.Container.Object;
    }
    else
    {
        TFieldPath<FField> FieldRef(InOutField.Container.Field);
        Ar << FieldRef;
        if (Ar.IsLoading())
        {
            InOutField.Container.Field = FieldRef.Get();
        }
    }
    return Ar;
}

/*-----------------------------------------------------------------------------
FField implementation.
-----------------------------------------------------------------------------*/

FField* FField::Construct(const FFieldVariant& InOwner, const FName& InName, EObjectFlags InFlags)
{
    // Can't construct an abstract type
    return nullptr;
}
FFieldClass* FField::StaticClass()
{
    static FFieldClass StaticFieldClass(TEXT("FField"), FField::StaticClassCastFlagsPrivate(), FField::StaticClassCastFlags(), nullptr, &FField::Construct);
    return &StaticFieldClass;
}

FField::FField(EInternal InInernal, FFieldClass* InClass)
    : ClassPrivate(InClass), Owner((FField*)nullptr), Next(nullptr), FlagsPrivate(RF_NoFlags)
#if WITH_EDITORONLY_DATA
      ,
      MetaDataMap(nullptr)
#endif  // WITH_EDITORONLY_DATA
{
}

FField::FField(FFieldVariant InOwner, const FName& InName, EObjectFlags InObjectFlags)
    : Owner(InOwner), Next(nullptr), NamePrivate(InName), FlagsPrivate(InObjectFlags)
#if WITH_EDITORONLY_DATA
      ,
      MetaDataMap(nullptr)
#endif  // WITH_EDITORONLY_DATA
{
}

FField::~FField()
{
#if WITH_EDITORONLY_DATA
    if (MetaDataMap)
    {
        delete MetaDataMap;
        MetaDataMap = nullptr;
    }
#endif  // WITH_EDITORONLY_DATA
}

#if WITH_EDITORONLY_DATA
FField::FField(UField* InField)
    : Next(nullptr), NamePrivate(InField->GetFName()), FlagsPrivate(RF_NoFlags), MetaDataMap(nullptr)
{
    check(InField);
    if (InField->HasAnyFlags(RF_NeedLoad))
    {
        // The source UField needs to be loaded, otherwise we'll be copying default property values
        InField->GetLinker()->Preload(InField);
    }
    FlagsPrivate = InField->GetFlags();
    // Associate this FField with the UField we're constructing from so that next time something tries to convert it,
    // it can already grab the cached new FField
    InField->SetAssociatedFField(this);

    UObject* OriginalOuter = InField->GetOuter();
    if (UProperty* OuterProperty = Cast<UProperty>(OriginalOuter))
    {
        FField* NewOwnerField = OuterProperty->GetAssociatedFField();
        if (!NewOwnerField)
        {
            NewOwnerField = CreateFromUField(OuterProperty);
            OuterProperty->SetAssociatedFField(NewOwnerField);
        }
        Owner = NewOwnerField;
    }
    else
    {
        Owner = OriginalOuter;
    }

    TMap<FName, FString>* FeldMetaDataMap = UMetaData::GetMapForObject(InField);
    if (FeldMetaDataMap && FeldMetaDataMap->Num())
    {
        MetaDataMap = new TMap<FName, FString>(*FeldMetaDataMap);
    }
}
#endif  // WITH_EDITORONLY_DATA

UClass* FField::GetOwnerClass() const
{
    UField* OwnerUField = GetOwnerUField();
    if (OwnerUField)
    {
        UClass* OwnerClass = Cast<UClass>(OwnerUField);
        if (OwnerClass)
        {
            return OwnerClass;
        }
        else
        {
            return OwnerUField->GetOwnerClass();
        }
    }
    else
    {
        return nullptr;
    }
}

UStruct* FField::GetOwnerStruct() const
{
    UObject* Obj = GetOwnerUObject();
    do
    {
        if (UStruct* Result = Cast<UStruct>(Obj))
        {
            return Result;
        }
        Obj = Obj->GetOuter();
    } while (Obj);

    return nullptr;
}

UField* FField::GetOwnerUField() const
{
    UObject* Obj = GetOwnerUObject();
    return CastChecked<UField>(Obj);
}

UPackage* FField::GetOutermost() const
{
    UObject* OwnerUObject = GetOwnerUObject();
    check(OwnerUObject);
    return OwnerUObject->GetOutermost();
}

void FField::Bind()
{
}

void FField::PostLoad()
{
    Bind();
}

void FField::Serialize(FArchive& Ar)
{
    Ar << NamePrivate;
    Ar << (uint32&)FlagsPrivate;

#if WITH_EDITORONLY_DATA
    if (!Ar.IsCooking())
    {
        UPackage* Package = GetOutermost();
        if (!Package || !Package->bIsCookedForEditor)
        {
            bool bHasMetaData = false;
            if (Ar.IsLoading())
            {
                Ar << bHasMetaData;
            }
            else
            {
                bHasMetaData = MetaDataMap && MetaDataMap->Num();
                Ar << bHasMetaData;
            }
            if (bHasMetaData)
            {
                if (!MetaDataMap)
                {
                    MetaDataMap = new TMap<FName, FString>();
                }
                Ar << *MetaDataMap;
            }
        }
    }
#endif
}

void FField::GetPreloadDependencies(TArray<UObject*>& OutDeps)
{
}

void FField::BeginDestroy()
{
}

void FField::AddReferencedObjects(FReferenceCollector& Collector)
{
    UObject* UObjectOwner = GetOwnerUObject();
    if (UObjectOwner)
    {
        Collector.AddReferencedObject(UObjectOwner);
    }
}

bool FField::IsRooted() const
{
    bool bIsRooted       = false;
    UObject* OwnerObject = GetOwnerUObject();
    while (OwnerObject)
    {
        if (OwnerObject->IsRooted())
        {
            bIsRooted = true;
            break;
        }
        else
        {
            OwnerObject = OwnerObject->GetOuter();
        }
    }
    return bIsRooted;
}

bool FField::IsNative() const
{
    UObject* OwnerObject = GetOwnerUObject();
    if (OwnerObject)
    {
        return OwnerObject->IsNative();
    }
    check(false);  // we shouldn't ever get here but if we do it's fine to remove this check
    return true;
}

bool FField::IsValidLowLevel() const
{
    return this != nullptr;
}

bool FField::IsIn(const UObject* InOwner) const
{
    check(InOwner);
    UObject* OwnerObject = GetOwnerUObject();
    if (OwnerObject)
    {
        if (OwnerObject == InOwner)
        {
            return true;
        }
        else
        {
            return OwnerObject->IsIn(InOwner);
        }
    }
    return false;
}

bool FField::IsIn(const FField* InOwner) const
{
    for (FField* OwnerField = GetOwner<FField>(); OwnerField; OwnerField = OwnerField->GetOwner<FField>())
    {
        if (OwnerField == InOwner)
        {
            return true;
        }
    }
    return false;
}

FLinkerLoad* FField::GetLinker() const
{
    UObject* OwnerObject = GetOwnerUObject();
    return OwnerObject ? OwnerObject->GetLinker() : nullptr;
}

void FField::AddCppProperty(FProperty* Property)
{
    UE_LOG(LogClass, Fatal, TEXT("FField::AddCppProperty"));
}

FString FField::GetPathName(const UObject* StopOuter /*= nullptr*/) const
{
    TStringBuilder<256> ResultString;
    GetPathName(StopOuter, ResultString);
    return FString(FStringView(ResultString));
}

void FField::GetPathName(const UObject* StopOuter, FStringBuilderBase& ResultString) const
{
    TArray<FName, TInlineAllocator<16>> ParentFields;
    for (FFieldVariant TempOwner = Owner; TempOwner.IsValid(); TempOwner = TempOwner.GetOwnerVariant())
    {
        if (!TempOwner.IsUObject())
        {
            FField* FieldOwner = TempOwner.ToField();
            ParentFields.Add(FieldOwner->GetFName());
        }
        else
        {
            UObject* ObjectOwner = TempOwner.ToUObject();
            ObjectOwner->GetPathName(StopOuter, ResultString);
            ResultString << SUBOBJECT_DELIMITER_CHAR;
            break;
        }
    }

    for (int FieldIndex = ParentFields.Num() - 1; FieldIndex >= 0; --FieldIndex)
    {
        ParentFields[FieldIndex].AppendString(ResultString);
        ResultString << TEXT(".");
    }
    GetFName().AppendString(ResultString);
}

FString FField::GetFullName() const
{
    FString FullName = GetClass()->GetName();
    FullName += TEXT(" ");
    FullName += GetPathName();
    return FullName;
}

UObject* FField::GetTypedOwner(UClass* Target) const
{
    UObject* Result = nullptr;
    for (UObject* NextOuter = GetOwnerUObject(); Result == nullptr && NextOuter != nullptr; NextOuter = NextOuter->GetOuter())
    {
        if (NextOuter->IsA(Target))
        {
            Result = NextOuter;
        }
    }
    return Result;
}

FString FField::GetAuthoredName() const
{
    UStruct* Struct = GetOwnerStruct();
    if (Struct)
    {
        return Struct->GetAuthoredNameForField(this);
    }
    return FString();
}

void FField::Rename(const FName& NewName)
{
    NamePrivate = NewName;
    // @todo: What about FFieldPath now?
}

FField* FField::GetTypedOwner(FFieldClass* Target) const
{
    FField* Result = nullptr;
    for (FField* NextOuter = GetOwner<FField>(); Result == nullptr && NextOuter != nullptr; NextOuter = NextOuter->GetOwner<FField>())
    {
        if (NextOuter->IsA(Target))
        {
            Result = NextOuter;
        }
    }
    return Result;
}

#if WITH_EDITORONLY_DATA
FString FField::GetFullGroupName(bool bStartWithOuter) const
{
    if (bStartWithOuter)
    {
        if (Owner.IsValid())
        {
            if (Owner.IsUObject())
            {
                return Owner.ToUObject()->GetPathName(Owner.ToUObject()->GetOutermost());
            }
            else
            {
                return Owner.ToField()->GetPathName(GetOutermost());
            }
        }
        else
        {
            return FString();
        }
    }
    else
    {
        return GetPathName(GetOutermost());
    }
}

struct FFieldDisplayNameHelper
{
    static FString Get(const FField& Object)
    {
        if (const FProperty* Property = CastField<FProperty>(&Object))
        {
            if (auto OwnerStruct = Property->GetOwnerStruct())
            {
                return OwnerStruct->GetAuthoredNameForField(Property);
            }
        }

        return Object.GetName();
    }
};

/**
 * Finds the localized display name or native display name as a fallback.
 *
 * @return The display name for this object.
 */
FText FField::GetDisplayNameText() const
{
    FText LocalizedDisplayName;

    static const FString Namespace = TEXT("UObjectDisplayNames");
    static const FName NAME_DisplayName(TEXT("DisplayName"));

    const FString Key = GetFullGroupName(false);

    FString NativeDisplayName;
    if (const FString* FoundMetaData = FindMetaData(NAME_DisplayName))
    {
        NativeDisplayName = *FoundMetaData;
    }
    else
    {
        NativeDisplayName = FName::NameToDisplayString(FFieldDisplayNameHelper::Get(*this), IsA<FBoolProperty>());
    }

    if (!(FText::FindText(Namespace, Key, /*OUT*/ LocalizedDisplayName, &NativeDisplayName)))
    {
        LocalizedDisplayName = FText::FromString(NativeDisplayName);
    }

    return LocalizedDisplayName;
}

/**
 * Finds the localized tooltip or native tooltip as a fallback.
 *
 * @return The tooltip for this object.
 */
FText FField::GetToolTipText(bool bShortTooltip) const
{
    bool bFoundShortTooltip = false;
    static const FName NAME_Tooltip(TEXT("Tooltip"));
    static const FName NAME_ShortTooltip(TEXT("ShortTooltip"));
    FText LocalizedToolTip;
    FString NativeToolTip;

    if (bShortTooltip)
    {
        NativeToolTip = GetMetaData(NAME_ShortTooltip);
        if (NativeToolTip.IsEmpty())
        {
            NativeToolTip = GetMetaData(NAME_Tooltip);
        }
        else
        {
            bFoundShortTooltip = true;
        }
    }
    else
    {
        NativeToolTip = GetMetaData(NAME_Tooltip);
    }

    const FString Namespace = bFoundShortTooltip ? TEXT("UObjectShortTooltips") : TEXT("UObjectToolTips");
    const FString Key       = GetFullGroupName(false);
    if (!FText::FindText(Namespace, Key, /*OUT*/ LocalizedToolTip, &NativeToolTip))
    {
        if (NativeToolTip.IsEmpty())
        {
            NativeToolTip = FName::NameToDisplayString(FFieldDisplayNameHelper::Get(*this), IsA<FBoolProperty>());
        }
        else
        {
            static const FString DoxygenSee(TEXT("@see"));
            static const FString TooltipSee(TEXT("See:"));
            if (NativeToolTip.ReplaceInline(*DoxygenSee, *TooltipSee) > 0)
            {
                NativeToolTip.TrimEndInline();
            }
        }
        LocalizedToolTip = FText::FromString(NativeToolTip);
    }

    return LocalizedToolTip;
}

const FString* FField::FindMetaData(const TCHAR* Key) const
{
    return FindMetaData(FName(Key, FNAME_Find));
}

const FString* FField::FindMetaData(const FName& Key) const
{
    return (MetaDataMap ? MetaDataMap->Find(Key) : nullptr);
}

/**
 * Find the metadata value associated with the key
 *
 * @param Key The key to lookup in the metadata
 * @return The value associated with the key
 */
const FString& FField::GetMetaData(const TCHAR* Key) const
{
    return GetMetaData(FName(Key, FNAME_Find));
}

const FString& FField::GetMetaData(const FName& Key) const
{
    // if not found, return a static empty string
    static FString EmptyString;

    // every key needs to be valid and meta data needs to exist
    if (Key == NAME_None || !MetaDataMap)
    {
        return EmptyString;
    }

    // look for the property
    const FString* ValuePtr = MetaDataMap->Find(Key);

    // if we didn't find it, return NULL
    if (!ValuePtr)
    {
        return EmptyString;
    }

    // if we found it, return the pointer to the character data
    return *ValuePtr;
}

const FText FField::GetMetaDataText(const TCHAR* MetaDataKey, const FString LocalizationNamespace, const FString LocalizationKey) const
{
    FString DefaultMetaData;

    if (const FString* FoundMetaData = FindMetaData(MetaDataKey))
    {
        DefaultMetaData = *FoundMetaData;
    }

    // If attempting to grab the DisplayName metadata, we must correct the source string and output it as a DisplayString for lookup
    if (DefaultMetaData.IsEmpty() && FString(MetaDataKey) == TEXT("DisplayName"))
    {
        DefaultMetaData = FName::NameToDisplayString(GetName(), IsA(FBoolProperty::StaticClass()));
    }

    FText LocalizedMetaData;
    if (!(FText::FindText(LocalizationNamespace, LocalizationKey, /*OUT*/ LocalizedMetaData, &DefaultMetaData)))
    {
        if (!DefaultMetaData.IsEmpty())
        {
            LocalizedMetaData = FText::AsCultureInvariant(DefaultMetaData);
        }
    }

    return LocalizedMetaData;
}

const FText FField::GetMetaDataText(const FName& MetaDataKey, const FString LocalizationNamespace, const FString LocalizationKey) const
{
    FString DefaultMetaData;

    if (const FString* FoundMetaData = FindMetaData(MetaDataKey))
    {
        DefaultMetaData = *FoundMetaData;
    }

    // If attempting to grab the DisplayName metadata, we must correct the source string and output it as a DisplayString for lookup
    if (DefaultMetaData.IsEmpty() && MetaDataKey == TEXT("DisplayName"))
    {
        DefaultMetaData = FName::NameToDisplayString(GetName(), IsA(FBoolProperty::StaticClass()));
    }

    FText LocalizedMetaData;
    if (!(FText::FindText(LocalizationNamespace, LocalizationKey, /*OUT*/ LocalizedMetaData, &DefaultMetaData)))
    {
        if (!DefaultMetaData.IsEmpty())
        {
            LocalizedMetaData = FText::AsCultureInvariant(DefaultMetaData);
        }
    }

    return LocalizedMetaData;
}

/**
 * Sets the metadata value associated with the key
 *
 * @param Key The key to lookup in the metadata
 * @return The value associated with the key
 */
void FField::SetMetaData(const TCHAR* Key, const TCHAR* InValue)
{
    SetMetaData(FName(Key), FString(InValue));
}

void FField::SetMetaData(const TCHAR* Key, FString&& InValue)
{
    SetMetaData(FName(Key), MoveTemp(InValue));
}

void FField::SetMetaData(const FName& Key, const TCHAR* InValue)
{
    SetMetaData(Key, FString(InValue));
}

void FField::SetMetaData(const FName& Key, FString&& InValue)
{
    check(Key != NAME_None);
    if (!MetaDataMap)
    {
        MetaDataMap = new TMap<FName, FString>();
    }
    MetaDataMap->Add(Key, MoveTemp(InValue));
}

UClass* FField::GetClassMetaData(const TCHAR* Key) const
{
    const FString& ClassName  = GetMetaData(Key);
    UClass* const FoundObject = FindObject<UClass>(ANY_PACKAGE, *ClassName);
    return FoundObject;
}

UClass* FField::GetClassMetaData(const FName& Key) const
{
    const FString& ClassName  = GetMetaData(Key);
    UClass* const FoundObject = FindObject<UClass>(ANY_PACKAGE, *ClassName);
    return FoundObject;
}

void FField::RemoveMetaData(const TCHAR* Key)
{
    RemoveMetaData(FName(Key));
}

void FField::RemoveMetaData(const FName& Key)
{
    check(Key != NAME_None);
    if (MetaDataMap)
    {
        MetaDataMap->Remove(Key);
    }
}

const TMap<FName, FString>* FField::GetMetaDataMap() const
{
    return MetaDataMap;
}

void FField::CopyMetaData(const FField* InSourceField, FField* InDestField)
{
    check(InSourceField);
    check(InDestField);
    if (InSourceField->MetaDataMap)
    {
        if (!InDestField->MetaDataMap)
        {
            InDestField->MetaDataMap = new TMap<FName, FString>();
        }
        *InDestField->MetaDataMap = *InSourceField->MetaDataMap;
    }
    else if (InDestField->MetaDataMap)
    {
        delete InDestField->MetaDataMap;
        InDestField->MetaDataMap = nullptr;
    }
}

#endif  // WITH_EDITORONLY_DATA

void FField::PostDuplicate(const FField& InField)
{
}

FField* FField::Duplicate(const FField* InField, FFieldVariant DestOwner, const FName DestName, EObjectFlags FlagMask, EInternalObjectFlags InternalFlagsMask)
{
    check(InField);
    FField* NewField = InField->GetClass()->Construct(DestOwner, DestName == NAME_None ? InField->GetFName() : DestName, InField->GetFlags() & FlagMask);
    NewField->PostDuplicate(*InField);
    return NewField;
}

FField* FField::Construct(const FName& FieldTypeName, const FFieldVariant& InOwner, const FName& InName, EObjectFlags InFlags)
{
    FFieldClass** FieldClassPtr = FFieldClass::GetNameToFieldClassMap().Find(FieldTypeName);
    checkf(FieldClassPtr, TEXT("Field type %s does not exist"), *FieldTypeName.ToString());
    FField* Instance = (*FieldClassPtr)->Construct(InOwner, InName, InFlags);
    return Instance;
}

FName FField::GenerateFFieldName(FFieldVariant InOwner /** Unused yet */, FFieldClass* InClass)
{
    check(InClass);
    return FName(*InClass->GetName(), InClass->GetNextUniqueNameIndex());
}

#if WITH_EDITORONLY_DATA

FField::FOnConvertCustomUFieldToFField& FField::GetConvertCustomUFieldToFFieldDelegate()
{
    static FOnConvertCustomUFieldToFField ConvertCustomUFieldToFFieldDelegate;
    return ConvertCustomUFieldToFFieldDelegate;
}

FField* FField::CreateFromUField(UField* InField)
{
    FField* NewField    = nullptr;
    UClass* UFieldClass = InField->GetClass();

    if (UFieldClass == UByteProperty::StaticClass())
    {
        NewField = new FByteProperty(InField);
    }
    else if (UFieldClass == UInt8Property::StaticClass())
    {
        NewField = new FInt8Property(InField);
    }
    else if (UFieldClass == UInt16Property::StaticClass())
    {
        NewField = new FInt16Property(InField);
    }
    else if (UFieldClass == UIntProperty::StaticClass())
    {
        NewField = new FIntProperty(InField);
    }
    else if (UFieldClass == UInt64Property::StaticClass())
    {
        NewField = new FInt64Property(InField);
    }
    else if (UFieldClass == UUInt16Property::StaticClass())
    {
        NewField = new FUInt16Property(InField);
    }
    else if (UFieldClass == UUInt32Property::StaticClass())
    {
        NewField = new FUInt32Property(InField);
    }
    else if (UFieldClass == UUInt64Property::StaticClass())
    {
        NewField = new FUInt64Property(InField);
    }
    else if (UFieldClass == UFloatProperty::StaticClass())
    {
        NewField = new FFloatProperty(InField);
    }
    else if (UFieldClass == UDoubleProperty::StaticClass())
    {
        NewField = new FDoubleProperty(InField);
    }
    else if (UFieldClass == UBoolProperty::StaticClass())
    {
        NewField = new FBoolProperty(InField);
    }
    else if (UFieldClass == UObjectProperty::StaticClass())
    {
        NewField = new FObjectProperty(InField);
    }
    else if (UFieldClass == UWeakObjectProperty::StaticClass())
    {
        NewField = new FWeakObjectProperty(InField);
    }
    else if (UFieldClass == ULazyObjectProperty::StaticClass())
    {
        NewField = new FLazyObjectProperty(InField);
    }
    else if (UFieldClass == USoftObjectProperty::StaticClass())
    {
        NewField = new FSoftObjectProperty(InField);
    }
    else if (UFieldClass == UClassProperty::StaticClass())
    {
        NewField = new FClassProperty(InField);
    }
    else if (UFieldClass == USoftClassProperty::StaticClass())
    {
        NewField = new FSoftClassProperty(InField);
    }
    else if (UFieldClass == UInterfaceProperty::StaticClass())
    {
        NewField = new FInterfaceProperty(InField);
    }
    else if (UFieldClass == UNameProperty::StaticClass())
    {
        NewField = new FNameProperty(InField);
    }
    else if (UFieldClass == UStrProperty::StaticClass())
    {
        NewField = new FStrProperty(InField);
    }
    else if (UFieldClass == UArrayProperty::StaticClass())
    {
        NewField = new FArrayProperty(InField);
    }
    else if (UFieldClass == UMapProperty::StaticClass())
    {
        NewField = new FMapProperty(InField);
    }
    else if (UFieldClass == USetProperty::StaticClass())
    {
        NewField = new FSetProperty(InField);
    }
    else if (UFieldClass == UStructProperty::StaticClass())
    {
        NewField = new FStructProperty(InField);
    }
    else if (UFieldClass == UDelegateProperty::StaticClass())
    {
        NewField = new FDelegateProperty(InField);
    }
    else if (UFieldClass == UMulticastInlineDelegateProperty::StaticClass())
    {
        NewField = new FMulticastInlineDelegateProperty(InField);
    }
    else if (UFieldClass == UMulticastSparseDelegateProperty::StaticClass())
    {
        NewField = new FMulticastSparseDelegateProperty(InField);
    }
    else if (UFieldClass == UEnumProperty::StaticClass())
    {
        NewField = new FEnumProperty(InField);
    }
    else if (UFieldClass == UTextProperty::StaticClass())
    {
        NewField = new FTextProperty(InField);
    }
    else
    {
        FFieldClass** FieldClassPtr = FFieldClass::GetNameToFieldClassMap().Find(UFieldClass->GetFName());
        checkf(FieldClassPtr, TEXT("Cannot create an FField from %s. The class is either abstract or not implemented."), *InField->GetFullName());
        GetConvertCustomUFieldToFFieldDelegate().Broadcast(*FieldClassPtr, InField, NewField);
        checkf(NewField, TEXT("Cannot create an FField from %s. The class conversion function is not implemented or not bound to FField::GetConvertCustomUFieldToFField() delegate."), *InField->GetFullName());
    }

    return NewField;
}
#endif  // WITH_EDITORONLY_DATA

FString GetFullNameSafe(const FField* InField)
{
    if (InField)
    {
        return InField->GetFullName();
    }
    else
    {
        return TEXT("none");
    }
}

FString GetPathNameSafe(const FField* InField)
{
    if (InField)
    {
        return InField->GetPathName();
    }
    else
    {
        return TEXT("none");
    }
}

FField* FindFPropertyByPath(const TCHAR* InFieldPath)
{
    // Expected format: FullPackageName.OwnerName:Field
    FField* FoundField = nullptr;
    TCHAR PathBuffer[NAME_SIZE];
    int32 LastSubobjectDelimiterIndex = -1;

    for (int32 Index = 0; InFieldPath[Index] != '\0'; ++Index)
    {
        if (InFieldPath[Index] == SUBOBJECT_DELIMITER_CHAR)
        {
            LastSubobjectDelimiterIndex = Index;
        }
    }
    if (LastSubobjectDelimiterIndex >= 0)
    {
        // Get the UObject part
        FCString::Strncpy(PathBuffer, InFieldPath, LastSubobjectDelimiterIndex + 1);

        // And the FField part
        InFieldPath += (LastSubobjectDelimiterIndex + 1);

        UStruct* Owner = FindObject<UStruct>(ANY_PACKAGE, PathBuffer);
        if (Owner)
        {
#if DO_CHECK
            for (const TCHAR* TestChar = InFieldPath; *TestChar != '\0'; TestChar++)
            {
                checkf(*TestChar != ':' && *TestChar != '.', TEXT("FindFieldByPath can't resolve nested properties: %s"), InFieldPath);
            }
#endif
            FoundField = FindFProperty<FField>(Owner, InFieldPath);
        }
    }
    return FoundField;
}

#include "UObject/DefineUPropertyMacros.h"