EM_Task/CoreUObject/Private/AssetRegistry/AssetData.cpp

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

#include "AssetRegistry/AssetData.h"
#include "AssetRegistry/ARFilter.h"
#include "Serialization/CustomVersion.h"
#include "String/Find.h"
#include "UObject/PropertyPortFlags.h"

DEFINE_LOG_CATEGORY(LogAssetData);

IMPLEMENT_STRUCT(ARFilter);
IMPLEMENT_STRUCT(AssetData);

// Register Asset Registry version
const FGuid FAssetRegistryVersion::GUID(0x717F9EE7, 0xE9B0493A, 0x88B39132, 0x1B388107);
FCustomVersionRegistration GRegisterAssetRegistryVersion(FAssetRegistryVersion::GUID, FAssetRegistryVersion::LatestVersion, TEXT("AssetRegistry"));

namespace UE
{
namespace AssetData
{
namespace Private
{

const FName GAssetBundleDataName("AssetBundleData");

static TSharedPtr<FAssetBundleData, ESPMode::ThreadSafe> ParseAssetBundles(const TCHAR* Text, const FAssetData& Context)
{
    // Register that we're reading string assets for a specific package
    FSoftObjectPathSerializationScope SerializationScope(Context.PackageName, GAssetBundleDataName, ESoftObjectPathCollectType::NeverCollect, ESoftObjectPathSerializeType::AlwaysSerialize);

    FAssetBundleData Temp;
    if (!Temp.ImportTextItem(Text, PPF_None, nullptr, (FOutputDevice*)GWarn))
    {
        // Native UScriptStruct isn't available during early cooked asset registry preloading.
        // Preloading should not require this fallback.

        UScriptStruct& Struct = *TBaseStructure<FAssetBundleData>::Get();
        Struct.ImportText(Text, &Temp, nullptr, PPF_None, (FOutputDevice*)GWarn,
                          [&]()
                          {
                              return Context.AssetName.ToString();
                          });
    }

    if (Temp.Bundles.Num() > 0)
    {
        return TSharedPtr<FAssetBundleData, ESPMode::ThreadSafe>(new FAssetBundleData(MoveTemp(Temp)));
    }

    return TSharedPtr<FAssetBundleData, ESPMode::ThreadSafe>();
}

}  // namespace Private
}  // namespace AssetData
}  // namespace UE

FAssetData::FAssetData(FName InPackageName, FName InPackagePath, FName InAssetName, FName InAssetClass, FAssetDataTagMap InTags, TArrayView<const int32> InChunkIDs, uint32 InPackageFlags)
    : PackageName(InPackageName), PackagePath(InPackagePath), AssetName(InAssetName), AssetClass(InAssetClass), ChunkIDs(MoveTemp(InChunkIDs)), PackageFlags(InPackageFlags)
{
    SetTagsAndAssetBundles(MoveTemp(InTags));

    TStringBuilder<FName::StringBufferSize> ObjectPathStr;
    PackageName.AppendString(ObjectPathStr);
    ObjectPathStr << TEXT('.');
    AssetName.AppendString(ObjectPathStr);
    ObjectPath = FName(FStringView(ObjectPathStr));
}

FAssetData::FAssetData(const FString& InLongPackageName, const FString& InObjectPath, FName InAssetClass, FAssetDataTagMap InTags, TArrayView<const int32> InChunkIDs, uint32 InPackageFlags)
    : ObjectPath(*InObjectPath), PackageName(*InLongPackageName), AssetClass(InAssetClass), ChunkIDs(MoveTemp(InChunkIDs)), PackageFlags(InPackageFlags)
{
    SetTagsAndAssetBundles(MoveTemp(InTags));

    PackagePath = FName(*FPackageName::GetLongPackagePath(InLongPackageName));

    // Find the object name from the path, FPackageName::ObjectPathToObjectName(InObjectPath)) doesn't provide what we want here
    int32 CharPos = InObjectPath.FindLastCharByPredicate([](TCHAR Char)
                                                         {
                                                             return Char == ':' || Char == '.';
                                                         });
    AssetName     = FName(*InObjectPath.Mid(CharPos + 1));
}

FAssetData::FAssetData(const UObject* InAsset, bool bAllowBlueprintClass)
{
    if (InAsset != nullptr)
    {
        const UClass* InClass = Cast<UClass>(InAsset);
        if (InClass && InClass->ClassGeneratedBy && !bAllowBlueprintClass)
        {
            // For Blueprints, the AssetData refers to the UBlueprint and not the UBlueprintGeneratedClass
            InAsset = InClass->ClassGeneratedBy;
        }

        const UPackage* Outermost = InAsset->GetOutermost();

        PackageName               = Outermost->GetFName();
        PackagePath               = FName(*FPackageName::GetLongPackagePath(Outermost->GetName()));
        AssetName                 = InAsset->GetFName();
        AssetClass                = InAsset->GetClass()->GetFName();
        ObjectPath                = FName(*InAsset->GetPathName());

        InAsset->GetAssetRegistryTags(*this);

        ChunkIDs     = Outermost->GetChunkIDs();
        PackageFlags = Outermost->GetPackageFlags();
    }
}

bool FAssetData::IsUAsset(UObject* InAsset)
{
    if (InAsset == nullptr)
    {
        return false;
    }

    const UPackage* Package = InAsset->GetPackage();

    TStringBuilder<FName::StringBufferSize> AssetNameStrBuilder;
    InAsset->GetPathName(Package, AssetNameStrBuilder);

    TStringBuilder<FName::StringBufferSize> PackageNameStrBuilder;
    Package->GetFName().AppendString(PackageNameStrBuilder);

    return DetectIsUAssetByNames(PackageNameStrBuilder, AssetNameStrBuilder);
}

void FAssetData::SetTagsAndAssetBundles(FAssetDataTagMap&& Tags)
{
    using namespace UE::AssetData::Private;

    for (TPair<FName, FString>& Tag: Tags)
    {
        check(!Tag.Key.IsNone() && !Tag.Value.IsEmpty());
    }

    FString AssetBundles;
    if (Tags.RemoveAndCopyValue(GAssetBundleDataName, AssetBundles))
    {
        TaggedAssetBundles = ParseAssetBundles(*AssetBundles, *this);
    }
    else
    {
        TaggedAssetBundles.Reset();
    }

    TagsAndValues = Tags.Num() > 0 ? FAssetDataTagMapSharedView(MoveTemp(Tags)) : FAssetDataTagMapSharedView();
}

FPrimaryAssetId FAssetData::GetPrimaryAssetId() const
{
    FName PrimaryAssetType = GetTagValueRef<FName>(FPrimaryAssetId::PrimaryAssetTypeTag);
    FName PrimaryAssetName = GetTagValueRef<FName>(FPrimaryAssetId::PrimaryAssetNameTag);

    if (!PrimaryAssetType.IsNone() && !PrimaryAssetName.IsNone())
    {
        return FPrimaryAssetId(PrimaryAssetType, PrimaryAssetName);
    }

    return FPrimaryAssetId();
}

bool FAssetRegistryVersion::SerializeVersion(FArchive& Ar, FAssetRegistryVersion::Type& Version)
{
    FGuid Guid = FAssetRegistryVersion::GUID;

    if (Ar.IsLoading())
    {
        Version = FAssetRegistryVersion::PreVersioning;
    }

    Ar << Guid;

    if (Ar.IsError())
    {
        return false;
    }

    if (Guid == FAssetRegistryVersion::GUID)
    {
        int32 VersionInt = Version;
        Ar << VersionInt;
        Version = (FAssetRegistryVersion::Type)VersionInt;

        Ar.SetCustomVersion(Guid, VersionInt, TEXT("AssetRegistry"));
    }
    else
    {
        return false;
    }

    return !Ar.IsError();
}