UnrealEngineUWP/Engine/Source/Developer/AssetTools/Private/AssetTools.cpp

// Copyright 1998-2016 Epic Games, Inc. All Rights Reserved.

#include "AssetToolsPrivatePCH.h"
#include "ObjectTools.h"
#include "PackageTools.h"
#include "AssetRegistryModule.h"
#include "DesktopPlatformModule.h"
#include "AssetToolsModule.h"
#include "MainFrame.h"
#include "ContentBrowserModule.h"
#include "ReferencedAssetsUtils.h"
#include "SPackageReportDialog.h"
#include "EngineAnalytics.h"
#include "IAnalyticsProvider.h"
#include "MessageLog.h"
#include "UnrealExporter.h"
#include "SNotificationList.h"
#include "NotificationManager.h"
#include "AutomatedAssetImportData.h"

#define LOCTEXT_NAMESPACE "AssetTools"

FAssetTools::FAssetTools()
	: AssetRenameManager( MakeShareable(new FAssetRenameManager) )
	, AssetFixUpRedirectors( MakeShareable(new FAssetFixUpRedirectors) )
	, NextUserCategoryBit( EAssetTypeCategories::FirstUser )
{
	// Register the built-in advanced categories
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_0"), FAdvancedAssetCategory(EAssetTypeCategories::Animation, LOCTEXT("AnimationAssetCategory", "Animation")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_1"), FAdvancedAssetCategory(EAssetTypeCategories::Blueprint, LOCTEXT("BlueprintAssetCategory", "Blueprints")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_2"), FAdvancedAssetCategory(EAssetTypeCategories::MaterialsAndTextures, LOCTEXT("MaterialAssetCategory", "Materials & Textures")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_3"), FAdvancedAssetCategory(EAssetTypeCategories::Sounds, LOCTEXT("SoundAssetCategory", "Sounds")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_4"), FAdvancedAssetCategory(EAssetTypeCategories::Physics, LOCTEXT("PhysicsAssetCategory", "Physics")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_5"), FAdvancedAssetCategory(EAssetTypeCategories::UI, LOCTEXT("UserInterfaceAssetCategory", "User Interface")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_6"), FAdvancedAssetCategory(EAssetTypeCategories::Misc, LOCTEXT("MiscellaneousAssetCategory", "Miscellaneous")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_7"), FAdvancedAssetCategory(EAssetTypeCategories::Gameplay, LOCTEXT("GameplayAssetCategory", "Gameplay")));
	AllocatedCategoryBits.Add(TEXT("_BuiltIn_8"), FAdvancedAssetCategory(EAssetTypeCategories::Media, LOCTEXT("MediaAssetCategory", "Media")));

	EAssetTypeCategories::Type BlendablesCategoryBit = RegisterAdvancedAssetCategory(FName(TEXT("Blendables")), LOCTEXT("BlendablesAssetCategory", "Blendables"));

	// Register the built-in asset type actions
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AnimationAsset) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AnimBlueprint) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AnimComposite) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AnimMontage) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AnimSequence) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AimOffset) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_AimOffset1D) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_BlendSpace) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_PoseAsset));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_BlendSpace1D) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Blueprint) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CameraAnim) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CanvasRenderTarget2D) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Curve) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CurveFloat) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CurveTable) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CurveVector) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_CurveLinearColor) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_DataAsset) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_DataTable) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_DestructibleMesh) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_DialogueVoice) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_DialogueWave) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Enum) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Class) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Struct) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SceneImportData));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Font) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_ForceFeedbackEffect) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SubsurfaceProfile));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_InstancedFoliageSettings) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_InterpData) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_LandscapeLayer) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_LandscapeGrassType));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Material(BlendablesCategoryBit)));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_MaterialFunction) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_MaterialInstanceConstant(BlendablesCategoryBit)) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_MaterialInterface) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_MaterialParameterCollection) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_MorphTarget) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_ObjectLibrary) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_ParticleSystem) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_PhysicalMaterial) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_PhysicsAsset) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_PreviewMeshCollection) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_ProceduralFoliageSpawner) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Redirector) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_ReverbEffect) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Rig) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SkeletalMesh) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Skeleton) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SlateBrush) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SlateWidgetStyle) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundAttenuation) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundConcurrency));
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundBase) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundClass) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundCue) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundMix) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_SoundWave) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_StaticMesh) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Texture) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_Texture2D) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TextureCube) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TextureRenderTarget) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TextureRenderTarget2D) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TextureRenderTargetCube) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TextureLightProfile) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_TouchInterface) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_VectorField) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_VectorFieldAnimated) );
	RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_VectorFieldStatic) );

	// Note: Please don't add any more actions here!  They belong in an editor-only module that is more tightly
	// coupled to your new system, and you should not create a dependency on your new system from AssetTools.

	if ( UEditorEngine::IsUsingWorldAssets() )
	{
		RegisterAssetTypeActions( MakeShareable(new FAssetTypeActions_World) );
	}
}

FAssetTools::~FAssetTools()
{

}

void FAssetTools::RegisterAssetTypeActions(const TSharedRef<IAssetTypeActions>& NewActions)
{
	AssetTypeActionsList.Add(NewActions);
}

void FAssetTools::UnregisterAssetTypeActions(const TSharedRef<IAssetTypeActions>& ActionsToRemove)
{
	AssetTypeActionsList.Remove(ActionsToRemove);
}

void FAssetTools::GetAssetTypeActionsList( TArray<TWeakPtr<IAssetTypeActions>>& OutAssetTypeActionsList ) const
{
	for (auto ActionsIt = AssetTypeActionsList.CreateConstIterator(); ActionsIt; ++ActionsIt)
	{
		OutAssetTypeActionsList.Add(*ActionsIt);
	}
}

TWeakPtr<IAssetTypeActions> FAssetTools::GetAssetTypeActionsForClass( UClass* Class ) const
{
	TSharedPtr<IAssetTypeActions> MostDerivedAssetTypeActions;

	for (int32 TypeActionsIdx = 0; TypeActionsIdx < AssetTypeActionsList.Num(); ++TypeActionsIdx)
	{
		TSharedRef<IAssetTypeActions> TypeActions = AssetTypeActionsList[TypeActionsIdx];
		UClass* SupportedClass = TypeActions->GetSupportedClass();

		if ( Class->IsChildOf(SupportedClass) )
		{
			if ( !MostDerivedAssetTypeActions.IsValid() || SupportedClass->IsChildOf( MostDerivedAssetTypeActions->GetSupportedClass() ) )
			{
				MostDerivedAssetTypeActions = TypeActions;
			}
		}
	}

	return MostDerivedAssetTypeActions;
}

EAssetTypeCategories::Type FAssetTools::RegisterAdvancedAssetCategory(FName CategoryKey, FText CategoryDisplayName)
{
	EAssetTypeCategories::Type Result = FindAdvancedAssetCategory(CategoryKey);
	if (Result == EAssetTypeCategories::Misc)
	{
		if (NextUserCategoryBit != 0)
		{
			// Register the category
			Result = (EAssetTypeCategories::Type)NextUserCategoryBit;
			AllocatedCategoryBits.Add(CategoryKey, FAdvancedAssetCategory(Result, CategoryDisplayName));

			// Advance to the next bit, or store that we're out
			if (NextUserCategoryBit == EAssetTypeCategories::LastUser)
			{
				NextUserCategoryBit = 0;
			}
			else
			{
				NextUserCategoryBit = NextUserCategoryBit << 1;
			}
		}
		else
		{
			UE_LOG(LogAssetTools, Warning, TEXT("RegisterAssetTypeCategory(\"%s\", \"%s\") failed as all user bits have been exhausted (placing into the Misc category instead)"), *CategoryKey.ToString(), *CategoryDisplayName.ToString());
		}
	}

	return Result;
}

EAssetTypeCategories::Type FAssetTools::FindAdvancedAssetCategory(FName CategoryKey) const
{
	if (const FAdvancedAssetCategory* ExistingCategory = AllocatedCategoryBits.Find(CategoryKey))
	{
		return ExistingCategory->CategoryType;
	}
	else
	{
		return EAssetTypeCategories::Misc;
	}
}

void FAssetTools::GetAllAdvancedAssetCategories(TArray<FAdvancedAssetCategory>& OutCategoryList) const
{
	AllocatedCategoryBits.GenerateValueArray(OutCategoryList);
}

void FAssetTools::RegisterClassTypeActions(const TSharedRef<IClassTypeActions>& NewActions)
{
	ClassTypeActionsList.Add(NewActions);
}

void FAssetTools::UnregisterClassTypeActions(const TSharedRef<IClassTypeActions>& ActionsToRemove)
{
	ClassTypeActionsList.Remove(ActionsToRemove);
}

void FAssetTools::GetClassTypeActionsList( TArray<TWeakPtr<IClassTypeActions>>& OutClassTypeActionsList ) const
{
	for (auto ActionsIt = ClassTypeActionsList.CreateConstIterator(); ActionsIt; ++ActionsIt)
	{
		OutClassTypeActionsList.Add(*ActionsIt);
	}
}

TWeakPtr<IClassTypeActions> FAssetTools::GetClassTypeActionsForClass( UClass* Class ) const
{
	TSharedPtr<IClassTypeActions> MostDerivedClassTypeActions;

	for (int32 TypeActionsIdx = 0; TypeActionsIdx < ClassTypeActionsList.Num(); ++TypeActionsIdx)
	{
		TSharedRef<IClassTypeActions> TypeActions = ClassTypeActionsList[TypeActionsIdx];
		UClass* SupportedClass = TypeActions->GetSupportedClass();

		if ( Class->IsChildOf(SupportedClass) )
		{
			if ( !MostDerivedClassTypeActions.IsValid() || SupportedClass->IsChildOf( MostDerivedClassTypeActions->GetSupportedClass() ) )
			{
				MostDerivedClassTypeActions = TypeActions;
			}
		}
	}

	return MostDerivedClassTypeActions;
}

bool FAssetTools::GetAssetActions( const TArray<UObject*>& InObjects, FMenuBuilder& MenuBuilder, bool bIncludeHeading )
{
	bool bAddedActions = false;

	if ( InObjects.Num() )
	{
		// Find the most derived common class for all passed in Objects
		UClass* CommonClass = InObjects[0]->GetClass();
		for (int32 ObjIdx = 1; ObjIdx < InObjects.Num(); ++ObjIdx)
		{
			while (!InObjects[ObjIdx]->IsA(CommonClass))
			{
				CommonClass = CommonClass->GetSuperClass();
			}
		}

		// Get the nearest common asset type for all the selected objects
		TSharedPtr<IAssetTypeActions> CommonAssetTypeActions = GetAssetTypeActionsForClass(CommonClass).Pin();

		// If we found a common type actions object, get actions from it
		if ( CommonAssetTypeActions.IsValid() && CommonAssetTypeActions->HasActions(InObjects) )
		{
			if ( bIncludeHeading )
			{
				MenuBuilder.BeginSection("GetAssetActions", FText::Format( LOCTEXT("AssetSpecificOptionsMenuHeading", "{0} Actions"), CommonAssetTypeActions->GetName() ) );
			}

			// Get the actions
			CommonAssetTypeActions->GetActions(InObjects, MenuBuilder);

			if ( bIncludeHeading )
			{
				MenuBuilder.EndSection();
			}

			bAddedActions = true;
		}
	}

	return bAddedActions;
}

struct FRootedOnScope
{
	UObject* Obj;

	FRootedOnScope(UObject* InObj) : Obj(nullptr)
	{
		if (InObj && !InObj->IsRooted())
		{
			Obj = InObj;
			Obj->AddToRoot();
		}
	}

	~FRootedOnScope()
	{
		if (Obj)
		{
			Obj->RemoveFromRoot();
		}
	}
};

UObject* FAssetTools::CreateAsset(const FString& AssetName, const FString& PackagePath, UClass* AssetClass, UFactory* Factory, FName CallingContext)
{
	FRootedOnScope DontGCFactory(Factory);

	// Verify the factory class
	if ( !ensure(AssetClass || Factory) )
	{
		FMessageDialog::Open( EAppMsgType::Ok, LOCTEXT("MustSupplyClassOrFactory", "The new asset wasn't created due to a problem finding the appropriate factory or class for the new asset.") );
		return nullptr;
	}

	if ( AssetClass && Factory && !ensure(AssetClass->IsChildOf(Factory->GetSupportedClass())) )
	{
		FMessageDialog::Open( EAppMsgType::Ok, LOCTEXT("InvalidFactory", "The new asset wasn't created because the supplied factory does not support the supplied class.") );
		return nullptr;
	}

	const FString PackageName = PackagePath + TEXT("/") + AssetName;

	// Make sure we can create the asset without conflicts
	if ( !CanCreateAsset(AssetName, PackageName, LOCTEXT("CreateANewObject", "Create a new object")) )
	{
		return nullptr;
	}

	UClass* ClassToUse = AssetClass ? AssetClass : (Factory ? Factory->GetSupportedClass() : nullptr);

	UPackage* Pkg = CreatePackage(nullptr,*PackageName);
	UObject* NewObj = nullptr;
	EObjectFlags Flags = RF_Public|RF_Standalone;
	if ( Factory )
	{
		NewObj = Factory->FactoryCreateNew(ClassToUse, Pkg, FName( *AssetName ), Flags, nullptr, GWarn, CallingContext);
	}
	else if ( AssetClass )
	{
		NewObj = NewObject<UObject>(Pkg, ClassToUse, FName(*AssetName), Flags);
	}

	if( NewObj )
	{
		// Notify the asset registry
		FAssetRegistryModule::AssetCreated(NewObj);

		// analytics create record
		FAssetTools::OnNewCreateRecord(AssetClass, false);

		// Mark the package dirty...
		Pkg->MarkPackageDirty();
	}

	return NewObj;
}

UObject* FAssetTools::CreateAsset(UClass* AssetClass, UFactory* Factory, FName CallingContext)
{
	if (Factory != nullptr)
	{
		// Determine the starting path. Try to use the most recently used directory
		FString AssetPath;

		const FString DefaultFilesystemDirectory = FEditorDirectories::Get().GetLastDirectory(ELastDirectory::NEW_ASSET);
		if (DefaultFilesystemDirectory.IsEmpty() || !FPackageName::TryConvertFilenameToLongPackageName(DefaultFilesystemDirectory, AssetPath))
		{
			// No saved path, just use the game content root
			AssetPath = TEXT("/Game");
		}

		FString PackageName;
		FString AssetName;
		CreateUniqueAssetName(AssetPath / Factory->GetDefaultNewAssetName(), TEXT(""), PackageName, AssetName);

		return CreateAssetWithDialog(AssetName, AssetPath, AssetClass, Factory, CallingContext);
	}

	return nullptr;
}


UObject* FAssetTools::CreateAssetWithDialog(const FString& AssetName, const FString& PackagePath, UClass* AssetClass, UFactory* Factory, FName CallingContext)
{
	FSaveAssetDialogConfig SaveAssetDialogConfig;
	SaveAssetDialogConfig.DialogTitleOverride = LOCTEXT("SaveAssetDialogTitle", "Save Asset As");
	SaveAssetDialogConfig.DefaultPath = PackagePath;
	SaveAssetDialogConfig.DefaultAssetName = AssetName;
	SaveAssetDialogConfig.ExistingAssetPolicy = ESaveAssetDialogExistingAssetPolicy::AllowButWarn;

	FContentBrowserModule& ContentBrowserModule = FModuleManager::LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
	FString SaveObjectPath = ContentBrowserModule.Get().CreateModalSaveAssetDialog(SaveAssetDialogConfig);
	if (!SaveObjectPath.IsEmpty())
	{
		FEditorDelegates::OnConfigureNewAssetProperties.Broadcast(Factory);
		if (Factory->ConfigureProperties())
		{
			const FString SavePackageName = FPackageName::ObjectPathToPackageName(SaveObjectPath);
			const FString SavePackagePath = FPaths::GetPath(SavePackageName);
			const FString SaveAssetName = FPaths::GetBaseFilename(SavePackageName);
			FEditorDirectories::Get().SetLastDirectory(ELastDirectory::NEW_ASSET, PackagePath);

			return CreateAsset(SaveAssetName, SavePackagePath, AssetClass, Factory, CallingContext);
		}
	}

	return nullptr;
}

UObject* FAssetTools::DuplicateAssetWithDialog(const FString& AssetName, const FString& PackagePath, UObject* OriginalObject)
{
	FSaveAssetDialogConfig SaveAssetDialogConfig;
	SaveAssetDialogConfig.DialogTitleOverride = LOCTEXT("DuplicateAssetDialogTitle", "Duplicate Asset As");
	SaveAssetDialogConfig.DefaultPath = PackagePath;
	SaveAssetDialogConfig.DefaultAssetName = AssetName;
	SaveAssetDialogConfig.ExistingAssetPolicy = ESaveAssetDialogExistingAssetPolicy::AllowButWarn;

	FContentBrowserModule& ContentBrowserModule = FModuleManager::LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
	FString SaveObjectPath = ContentBrowserModule.Get().CreateModalSaveAssetDialog(SaveAssetDialogConfig);
	if (!SaveObjectPath.IsEmpty())
	{
		const FString SavePackageName = FPackageName::ObjectPathToPackageName(SaveObjectPath);
		const FString SavePackagePath = FPaths::GetPath(SavePackageName);
		const FString SaveAssetName = FPaths::GetBaseFilename(SavePackageName);
		FEditorDirectories::Get().SetLastDirectory(ELastDirectory::NEW_ASSET, PackagePath);

		return DuplicateAsset(SaveAssetName, SavePackagePath, OriginalObject);
	}

	return nullptr;
}

UObject* FAssetTools::DuplicateAsset(const FString& AssetName, const FString& PackagePath, UObject* OriginalObject)
{
	// Verify the source object
	if ( !OriginalObject )
	{
		FMessageDialog::Open( EAppMsgType::Ok, LOCTEXT("InvalidSourceObject", "The new asset wasn't created due to a problem finding the object to duplicate.") );
		return nullptr;
	}

	const FString PackageName = PackagePath + TEXT("/") + AssetName;

	// Make sure we can create the asset without conflicts
	if ( !CanCreateAsset(AssetName, PackageName, LOCTEXT("DuplicateAnObject", "Duplicate an object")) )
	{
		return nullptr;
	}

	ObjectTools::FPackageGroupName PGN;
	PGN.PackageName = PackageName;
	PGN.GroupName = TEXT("");
	PGN.ObjectName = AssetName;

	TSet<UPackage*> ObjectsUserRefusedToFullyLoad;
	UObject* NewObject = ObjectTools::DuplicateSingleObject(OriginalObject, PGN, ObjectsUserRefusedToFullyLoad);
	if(NewObject != nullptr)
	{
		if ( ISourceControlModule::Get().IsEnabled() )
		{
			// Save package here if SCC is enabled because the user can use SCC to revert a change
			TArray<UPackage*> OutermostPackagesToSave;
			OutermostPackagesToSave.Add(NewObject->GetOutermost());

			const bool bCheckDirty = false;
			const bool bPromptToSave = false;
			FEditorFileUtils::PromptForCheckoutAndSave(OutermostPackagesToSave, bCheckDirty, bPromptToSave);

			// now attempt to branch, we can do this now as we should have a file on disk
			SourceControlHelpers::BranchPackage(NewObject->GetOutermost(), OriginalObject->GetOutermost());
		}

		// analytics create record
		FAssetTools::OnNewCreateRecord(NewObject->GetClass(), true);
	}

	return NewObject;
}

void FAssetTools::RenameAssets(const TArray<FAssetRenameData>& AssetsAndNames) const
{
	AssetRenameManager->RenameAssets(AssetsAndNames);
}

TArray<UObject*> FAssetTools::ImportAssets(const FString& DestinationPath)
{
	TArray<UObject*> ReturnObjects;
	FString FileTypes, AllExtensions;
	TArray<UFactory*> Factories;

	// Get the list of valid factories
	for( TObjectIterator<UClass> It ; It ; ++It )
	{
		UClass* CurrentClass = (*It);

		if( CurrentClass->IsChildOf(UFactory::StaticClass()) && !(CurrentClass->HasAnyClassFlags(CLASS_Abstract)) )
		{
			UFactory* Factory = Cast<UFactory>( CurrentClass->GetDefaultObject() );
			if( Factory->bEditorImport )
			{
				Factories.Add( Factory );
			}
		}
	}

	TMultiMap<uint32, UFactory*> FilterIndexToFactory;

	// Generate the file types and extensions represented by the selected factories
	ObjectTools::GenerateFactoryFileExtensions( Factories, FileTypes, AllExtensions, FilterIndexToFactory );

	FileTypes = FString::Printf(TEXT("All Files (%s)|%s|%s"),*AllExtensions,*AllExtensions,*FileTypes);

	// Prompt the user for the filenames
	TArray<FString> OpenFilenames;
	IDesktopPlatform* DesktopPlatform = FDesktopPlatformModule::Get();
	bool bOpened = false;
	int32 FilterIndex = -1;

	if ( DesktopPlatform )
	{
		const void* ParentWindowWindowHandle = FSlateApplication::Get().FindBestParentWindowHandleForDialogs(nullptr);

		bOpened = DesktopPlatform->OpenFileDialog(
			ParentWindowWindowHandle,
			LOCTEXT("ImportDialogTitle", "Import").ToString(),
			FEditorDirectories::Get().GetLastDirectory(ELastDirectory::GENERIC_IMPORT),
			TEXT(""),
			FileTypes,
			EFileDialogFlags::Multiple,
			OpenFilenames,
			FilterIndex
			);
	}

	if ( bOpened )
	{
		if ( OpenFilenames.Num() > 0 )
		{
			UFactory* ChosenFactory = nullptr;
			if (FilterIndex > 0)
			{
				ChosenFactory = *FilterIndexToFactory.Find(FilterIndex);
			}


			FEditorDirectories::Get().SetLastDirectory(ELastDirectory::GENERIC_IMPORT, OpenFilenames[0]);
			ReturnObjects = ImportAssets(OpenFilenames, DestinationPath, ChosenFactory);
		}
	}

	return ReturnObjects;
}

TArray<UObject*> FAssetTools::ImportAssetsAutomated(const UAutomatedAssetImportData& ImportData) const
{
	FAssetImportParams Params;

	Params.bAutomated = true;
	Params.bForceOverrideExisting = ImportData.bReplaceExisting;
	Params.bSyncToBrowser = false;
	Params.SpecifiedFactory = ImportData.Factory;
	Params.ImportData = &ImportData;

	return ImportAssetsInternal(ImportData.Filenames, ImportData.DestinationPath, Params);
}

void FAssetTools::ExpandDirectories(const TArray<FString>& Files, const FString& DestinationPath, TArray<TPair<FString, FString>>& FilesAndDestinations) const
{
	// Iterate through all files in the list, if any folders are found, recurse and expand them.
	for ( int32 FileIdx = 0; FileIdx < Files.Num(); ++FileIdx )
	{
		const FString& Filename = Files[FileIdx];

		// If the file being imported is a directory, just include all sub-files and skip the directory.
		if ( IFileManager::Get().DirectoryExists(*Filename) )
		{
			FString FolderName = FPaths::GetCleanFilename(Filename);

			// Get all files & folders in the folder.
			FString SearchPath = Filename / FString(TEXT("*"));
			TArray<FString> SubFiles;
			IFileManager::Get().FindFiles(SubFiles, *SearchPath, true, true);

			// FindFiles just returns file and directory names, so we need to tack on the root path to get the full path.
			TArray<FString> FullPathItems;
			for ( FString& SubFile : SubFiles )
			{
				FullPathItems.Add(Filename / SubFile);
			}

			// Expand any sub directories found.
			FString NewSubDestination = DestinationPath / FolderName;
			ExpandDirectories(FullPathItems, NewSubDestination, FilesAndDestinations);
		}
		else
		{
			// Add any files and their destination path.
			FilesAndDestinations.Add(TPairInitializer<FString, FString>(Filename, DestinationPath));
		}
	}
}

TArray<UObject*> FAssetTools::ImportAssets(const TArray<FString>& Files, const FString& RootDestinationPath, UFactory* SpecifiedFactory, bool bSyncToBrowser) const
{
	const bool bForceOverrideExisting = false;

	FAssetImportParams Params;

	Params.bAutomated = false;
	Params.bForceOverrideExisting = false;
	Params.bSyncToBrowser = bSyncToBrowser;
	Params.SpecifiedFactory = SpecifiedFactory;

	return ImportAssetsInternal(Files, RootDestinationPath, Params);
}

void FAssetTools::CreateUniqueAssetName(const FString& InBasePackageName, const FString& InSuffix, FString& OutPackageName, FString& OutAssetName) const
{
	const FString SanitizedBasePackageName = PackageTools::SanitizePackageName(InBasePackageName);

	const FString PackagePath = FPackageName::GetLongPackagePath(SanitizedBasePackageName);
	const FString BaseAssetNameWithSuffix = FPackageName::GetLongPackageAssetName(SanitizedBasePackageName) + InSuffix;
	const FString SanitizedBaseAssetName = ObjectTools::SanitizeObjectName(BaseAssetNameWithSuffix);

	int32 IntSuffix = 1;
	bool bObjectExists = false;

	int32 CharIndex = SanitizedBaseAssetName.Len() - 1;
	while (CharIndex >= 0 && SanitizedBaseAssetName[CharIndex] >= TEXT('0') && SanitizedBaseAssetName[CharIndex] <= TEXT('9'))
	{
		--CharIndex;
	}
	FString TrailingInteger;
	FString TrimmedBaseAssetName = SanitizedBaseAssetName;
	if (SanitizedBaseAssetName.Len() > 0 && CharIndex == -1)
	{
		// This is the all numeric name, in this case we'd like to append _number, because just adding a number isn't great
		TrimmedBaseAssetName += TEXT("_");
		IntSuffix = 2;
	}
	if (CharIndex >= 0 && CharIndex < SanitizedBaseAssetName.Len() - 1)
	{
		TrailingInteger = SanitizedBaseAssetName.RightChop(CharIndex + 1);
		TrimmedBaseAssetName = SanitizedBaseAssetName.Left(CharIndex + 1);
		IntSuffix = FCString::Atoi(*TrailingInteger);
	}

	FAssetRegistryModule& AssetRegistryModule = FModuleManager::Get().LoadModuleChecked<FAssetRegistryModule>(TEXT("AssetRegistry"));

	do
	{
		bObjectExists = false;
		if ( IntSuffix <= 1 )
		{
			OutAssetName = SanitizedBaseAssetName;
		}
		else
		{
			FString Suffix = FString::Printf(TEXT("%d"), IntSuffix);
			while (Suffix.Len() < TrailingInteger.Len())
			{
				Suffix = TEXT("0") + Suffix;
			}
			OutAssetName = FString::Printf(TEXT("%s%s"), *TrimmedBaseAssetName, *Suffix);
		}
	
		OutPackageName = PackagePath + TEXT("/") + OutAssetName;
		FString ObjectPath = OutPackageName + TEXT(".") + OutAssetName;

		// Use the asset registry if possible to find existing assets without loading them
		if ( !AssetRegistryModule.Get().IsLoadingAssets() )
		{
			FAssetData AssetData = AssetRegistryModule.Get().GetAssetByObjectPath(*ObjectPath);
			if(AssetData.IsValid())
			{
				bObjectExists = true;
			}
		}
		else
		{
			bObjectExists = LoadObject<UObject>(nullptr, *ObjectPath, nullptr, LOAD_NoWarn | LOAD_NoRedirects) != nullptr;
		}
		IntSuffix++;
	}
	while (bObjectExists != false);
}

bool FAssetTools::AssetUsesGenericThumbnail( const FAssetData& AssetData ) const
{
	if ( !AssetData.IsValid() )
	{
		// Invalid asset, assume it does not use a shared thumbnail
		return false;
	}

	if( AssetData.IsAssetLoaded() )
	{
		// Loaded asset, see if there is a rendering info for it
		UObject* Asset = AssetData.GetAsset();
		FThumbnailRenderingInfo* RenderInfo = GUnrealEd->GetThumbnailManager()->GetRenderingInfo( Asset );
		return !RenderInfo || !RenderInfo->Renderer;
	}

	if ( AssetData.AssetClass == UBlueprint::StaticClass()->GetFName() )
	{
		// Unloaded blueprint asset
		// It would be more correct here to find the rendering info for the generated class,
		// but instead we are simply seeing if there is a thumbnail saved on disk for this asset
		FString PackageFilename;
		if ( FPackageName::DoesPackageExist(AssetData.PackageName.ToString(), nullptr, &PackageFilename) )
		{
			TSet<FName> ObjectFullNames;
			FThumbnailMap ThumbnailMap;

			FName ObjectFullName = FName(*AssetData.GetFullName());
			ObjectFullNames.Add(ObjectFullName);

			ThumbnailTools::LoadThumbnailsFromPackage(PackageFilename, ObjectFullNames, ThumbnailMap);

			FObjectThumbnail* ThumbnailPtr = ThumbnailMap.Find(ObjectFullName);
			if (ThumbnailPtr)
			{
				return (*ThumbnailPtr).IsEmpty();
			}

			return true;
		}
	}
	else
	{
		// Unloaded non-blueprint asset. See if the class has a rendering info.
		UClass* Class = FindObject<UClass>(ANY_PACKAGE, *AssetData.AssetClass.ToString());

		UObject* ClassCDO = nullptr;
		if (Class != nullptr)
		{
			ClassCDO = Class->GetDefaultObject();
		}

		// Get the rendering info for this object
		FThumbnailRenderingInfo* RenderInfo = nullptr;
		if (ClassCDO != nullptr)
		{
			RenderInfo = GUnrealEd->GetThumbnailManager()->GetRenderingInfo( ClassCDO );
		}

		return !RenderInfo || !RenderInfo->Renderer;
	}

	return false;
}

void FAssetTools::DiffAgainstDepot( UObject* InObject, const FString& InPackagePath, const FString& InPackageName ) const
{
	check( InObject );

	// Make sure our history is up to date
	ISourceControlProvider& SourceControlProvider = ISourceControlModule::Get().GetProvider();
	TSharedRef<FUpdateStatus, ESPMode::ThreadSafe> UpdateStatusOperation = ISourceControlOperation::Create<FUpdateStatus>();
	UpdateStatusOperation->SetUpdateHistory(true);
	SourceControlProvider.Execute(UpdateStatusOperation, SourceControlHelpers::PackageFilename(InPackagePath));

	// Get the SCC state
	FSourceControlStatePtr SourceControlState = SourceControlProvider.GetState(SourceControlHelpers::PackageFilename(InPackagePath), EStateCacheUsage::Use);

	// If we have an asset and its in SCC..
	if( SourceControlState.IsValid() && InObject != nullptr && SourceControlState->IsSourceControlled() )
	{
		// Get the file name of package
		FString RelativeFileName;
		if(FPackageName::DoesPackageExist(InPackagePath, nullptr, &RelativeFileName))
		{
			if(SourceControlState->GetHistorySize() > 0)
			{
				TSharedPtr<ISourceControlRevision, ESPMode::ThreadSafe> Revision = SourceControlState->GetHistoryItem(0);
				check(Revision.IsValid());

				// Get the head revision of this package from source control
				FString AbsoluteFileName = FPaths::ConvertRelativePathToFull(RelativeFileName);
				FString TempFileName;
				if(Revision->Get(TempFileName))
				{
					// Forcibly disable compile on load in case we are loading old blueprints that might try to update/compile
					TGuardValue<bool> DisableCompileOnLoad(GForceDisableBlueprintCompileOnLoad, true);

					// Try and load that package
					UPackage* TempPackage = LoadPackage(nullptr, *TempFileName, LOAD_ForDiff);
					if(TempPackage != nullptr)
					{
						// Grab the old asset from that old package
						UObject* OldObject = FindObject<UObject>(TempPackage, *InPackageName);
						if(OldObject != nullptr)
						{
							/* Set the revision information*/
							FRevisionInfo OldRevision;
							OldRevision.Changelist = Revision->GetCheckInIdentifier();
							OldRevision.Date = Revision->GetDate();
							OldRevision.Revision = Revision->GetRevision();

							FRevisionInfo NewRevision; 
							NewRevision.Revision = TEXT("");
							DiffAssets(OldObject, InObject, OldRevision, NewRevision);
						}
					}
				}
			}
		} 
	}
}

void FAssetTools::DiffAssets(UObject* OldAsset, UObject* NewAsset, const struct FRevisionInfo& OldRevision, const struct FRevisionInfo& NewRevision) const
{
	if(OldAsset == nullptr || NewAsset == nullptr)
	{
		UE_LOG(LogAssetTools, Warning, TEXT("DiffAssets: One of the supplied assets was nullptr."));
		return;
	}

	// Get class of both assets 
	UClass* OldClass = OldAsset->GetClass();
	UClass* NewClass = NewAsset->GetClass();
	// If same class..
	if(OldClass == NewClass)
	{
		// Get class-specific actions
		TWeakPtr<IAssetTypeActions> Actions = GetAssetTypeActionsForClass( NewClass );
		if(Actions.IsValid())
		{
			// And use that to perform the Diff
			Actions.Pin()->PerformAssetDiff(OldAsset, NewAsset, OldRevision, NewRevision);
		}
	}
	else
	{
		UE_LOG(LogAssetTools, Warning, TEXT("DiffAssets: Classes were not the same."));
	}
}

FString FAssetTools::DumpAssetToTempFile(UObject* Asset) const
{
	check(Asset);

	// Clear the mark state for saving.
	UnMarkAllObjects(EObjectMark(OBJECTMARK_TagExp | OBJECTMARK_TagImp));

	FStringOutputDevice Archive;
	const FExportObjectInnerContext Context;

	// Export asset to archive
	UExporter::ExportToOutputDevice(&Context, Asset, nullptr, Archive, TEXT("copy"), 0, PPF_ExportsNotFullyQualified|PPF_Copy|PPF_Delimited, false, Asset->GetOuter());

	// Used to generate unique file names during a run
	static int TempFileNum = 0;

	// Build name for temp text file
	FString RelTempFileName = FString::Printf(TEXT("%sText%s-%d.txt"), *FPaths::DiffDir(), *Asset->GetName(), TempFileNum++);
	FString AbsoluteTempFileName = FPaths::ConvertRelativePathToFull(RelTempFileName);

	// Save text into temp file
	if( !FFileHelper::SaveStringToFile( Archive, *AbsoluteTempFileName ) )
	{
		//UE_LOG(LogAssetTools, Warning, TEXT("DiffAssets: Could not write %s"), *AbsoluteTempFileName);
		return TEXT("");
	}
	else
	{
		return AbsoluteTempFileName;
	}
}

FString WrapArgument(const FString& Argument)
{
	// Wrap the passed in argument so it changes from Argument to "Argument"
	return FString::Printf(TEXT("%s%s%s"),	(Argument.StartsWith("\"")) ? TEXT(""): TEXT("\""),
											*Argument,
											(Argument.EndsWith("\"")) ? TEXT(""): TEXT("\""));
}

bool FAssetTools::CreateDiffProcess(const FString& DiffCommand,  const FString& OldTextFilename,  const FString& NewTextFilename, const FString& DiffArgs) const
{
	// Construct Arguments
	FString Arguments = FString::Printf( TEXT("%s %s %s"),*WrapArgument(OldTextFilename), *WrapArgument(NewTextFilename), *DiffArgs );

	bool bTryRunDiff = true;
	FString NewDiffCommand = DiffCommand;

	while (bTryRunDiff)
	{
		// Fire process
		if (FPlatformProcess::CreateProc(*NewDiffCommand, *Arguments, true, false, false, nullptr, 0, nullptr, nullptr).IsValid())
		{
			return true;
		}
		else
		{
			const FText Message = FText::Format(NSLOCTEXT("AssetTools", "DiffFail", "The currently set diff tool '{0}' could not be run. Would you like to set a new diff tool?"), FText::FromString(DiffCommand));
			EAppReturnType::Type Response = FMessageDialog::Open(EAppMsgType::YesNo, Message);
			if (Response == EAppReturnType::No)
			{
				bTryRunDiff = false;
			}
			else
			{
				IDesktopPlatform* DesktopPlatform = FDesktopPlatformModule::Get();
				check(DesktopPlatform);

				const FText FileFilterType = NSLOCTEXT("AssetTools", "Executables", "Executables");
#if PLATFORM_WINDOWS
				const FString FileFilterText = FString::Printf(TEXT("%s (*.exe)|*.exe"), *FileFilterType.ToString());
#elif PLATFORM_MAC
				const FString FileFilterText = FString::Printf(TEXT("%s (*.app)|*.app"), *FileFilterType.ToString());
#else
				const FString FileFilterText = FString::Printf(TEXT("%s"), *FileFilterType.ToString());
#endif

				TArray<FString> OutFiles;
				if (DesktopPlatform->OpenFileDialog(
					nullptr,
					NSLOCTEXT("AssetTools", "ChooseDiffTool", "Choose Diff Tool").ToString(),
					TEXT(""),
					TEXT(""),
					FileFilterText,
					EFileDialogFlags::None,
					OutFiles))
				{
					UEditorLoadingSavingSettings& Settings = *GetMutableDefault<UEditorLoadingSavingSettings>();
					Settings.TextDiffToolPath.FilePath = OutFiles[0];
					Settings.SaveConfig();
					NewDiffCommand = OutFiles[0];
				}
			}
		}
	}

	return false;
}

void FAssetTools::MigratePackages(const TArray<FName>& PackageNamesToMigrate) const
{
	// Packages must be saved for the migration to work
	const bool bPromptUserToSave = true;
	const bool bSaveMapPackages = true;
	const bool bSaveContentPackages = true;
	if ( FEditorFileUtils::SaveDirtyPackages( bPromptUserToSave, bSaveMapPackages, bSaveContentPackages ) )
	{
		FAssetRegistryModule& AssetRegistryModule = FModuleManager::Get().LoadModuleChecked<FAssetRegistryModule>(TEXT("AssetRegistry"));
		if ( AssetRegistryModule.Get().IsLoadingAssets() )
		{
			// Open a dialog asking the user to wait while assets are being discovered
			SDiscoveringAssetsDialog::OpenDiscoveringAssetsDialog(
				SDiscoveringAssetsDialog::FOnAssetsDiscovered::CreateRaw(this, &FAssetTools::PerformMigratePackages, PackageNamesToMigrate)
				);
		}
		else
		{
			// Assets are already discovered, perform the migration now
			PerformMigratePackages(PackageNamesToMigrate);
		}
	}
}

void FAssetTools::OnNewImportRecord(UClass* AssetType, const FString& FileExtension, bool bSucceeded, bool bWasCancelled, const FDateTime& StartTime)
{
	// Don't attempt to report usage stats if analytics isn't available
	if(AssetType != nullptr && FEngineAnalytics::IsAvailable())
	{
		TArray<FAnalyticsEventAttribute> Attribs;
		Attribs.Add(FAnalyticsEventAttribute(TEXT("AssetType"), AssetType->GetName()));
		Attribs.Add(FAnalyticsEventAttribute(TEXT("FileExtension"), FileExtension));
		Attribs.Add(FAnalyticsEventAttribute(TEXT("Outcome"), bSucceeded ? TEXT("Success") : (bWasCancelled ? TEXT("Cancelled") : TEXT("Failed"))));
		FTimespan TimeTaken = FDateTime::UtcNow() - StartTime;
		Attribs.Add(FAnalyticsEventAttribute(TEXT("TimeTaken.Seconds"), (float)TimeTaken.GetTotalSeconds()));

		FEngineAnalytics::GetProvider().RecordEvent(TEXT("Editor.Usage.ImportAsset"), Attribs);
	}
}

void FAssetTools::OnNewCreateRecord(UClass* AssetType, bool bDuplicated)
{
	// Don't attempt to report usage stats if analytics isn't available
	if(AssetType != nullptr && FEngineAnalytics::IsAvailable())
	{
		TArray<FAnalyticsEventAttribute> Attribs;
		Attribs.Add(FAnalyticsEventAttribute(TEXT("AssetType"), AssetType->GetName()));
		Attribs.Add(FAnalyticsEventAttribute(TEXT("Duplicated"), bDuplicated? TEXT("Yes") : TEXT("No")));

		FEngineAnalytics::GetProvider().RecordEvent(TEXT("Editor.Usage.CreateAsset"), Attribs);
	}
}

TArray<UObject*> FAssetTools::ImportAssetsInternal(const TArray<FString>& Files, const FString& RootDestinationPath, const FAssetImportParams& Params) const
{
	UFactory* SpecifiedFactory = Params.SpecifiedFactory;
	const bool bForceOverrideExisting = Params.bForceOverrideExisting;
	const bool bSyncToBrowser = Params.bSyncToBrowser;
	const bool bAutomatedImport = Params.bAutomated || GIsAutomationTesting;

	TArray<UObject*> ReturnObjects;
	TMap< FString, TArray<UFactory*> > ExtensionToFactoriesMap;

	FScopedSlowTask SlowTask(Files.Num() + 3, LOCTEXT("ImportSlowTask", "Importing"));
	SlowTask.MakeDialog();


	SlowTask.EnterProgressFrame();

	TArray<TPair<FString, FString>> FilesAndDestinations;
	ExpandDirectories(Files, RootDestinationPath, FilesAndDestinations);

	SlowTask.EnterProgressFrame(1, LOCTEXT("Import_DeterminingImportTypes", "Determining asset types"));


	if(SpecifiedFactory == nullptr)
	{
		// First instantiate one factory for each file extension encountered that supports the extension
		// @todo import: gmp: show dialog in case of multiple matching factories
		for(TObjectIterator<UClass> ClassIt; ClassIt; ++ClassIt)
		{
			if(!(*ClassIt)->IsChildOf(UFactory::StaticClass()) || ((*ClassIt)->HasAnyClassFlags(CLASS_Abstract)))
			{
				continue;
			}

			UFactory* Factory = Cast<UFactory>((*ClassIt)->GetDefaultObject());

			if(!Factory->bEditorImport)
			{
				continue;
			}

			TArray<FString> FactoryExtensions;
			Factory->GetSupportedFileExtensions(FactoryExtensions);

			for(auto& FileDest : FilesAndDestinations)
			{
				const FString FileExtension = FPaths::GetExtension(FileDest.Key);

				// Case insensitive string compare with supported formats of this factory
				if(FactoryExtensions.Contains(FileExtension))
				{
					TArray<UFactory*>& ExistingFactories = ExtensionToFactoriesMap.FindOrAdd(FileExtension);

					// Do not remap extensions, just reuse the existing UFactory.
					// There may be multiple UFactories, so we will keep track of all of them
					bool bFactoryAlreadyInMap = false;
					for(auto FoundFactoryIt = ExistingFactories.CreateConstIterator(); FoundFactoryIt; ++FoundFactoryIt)
					{
						if((*FoundFactoryIt)->GetClass() == Factory->GetClass())
						{
							bFactoryAlreadyInMap = true;
							break;
						}
					}

					if(!bFactoryAlreadyInMap)
					{
						// We found a factory for this file, it can be imported!
						// Create a new factory of the same class and make sure it doesn't get GCed.
						// The object will be removed from the root set at the end of this function.
						UFactory* NewFactory = NewObject<UFactory>(GetTransientPackage(), Factory->GetClass());
						if(NewFactory->ConfigureProperties())
						{
							NewFactory->AddToRoot();
							ExistingFactories.Add(NewFactory);
						}
					}
				}
			}
		}
	}
	else if(SpecifiedFactory->bEditorImport && !bAutomatedImport) 
	{

		TArray<FString> FactoryExtensions;
		SpecifiedFactory->GetSupportedFileExtensions(FactoryExtensions);

		for(auto FileIt = Files.CreateConstIterator(); FileIt; ++FileIt)
		{
			const FString FileExtension = FPaths::GetExtension(*FileIt);

			// Case insensitive string compare with supported formats of this factory
			if(!FactoryExtensions.Contains(FileExtension))
			{
				continue;
			}

			TArray<UFactory*>& ExistingFactories = ExtensionToFactoriesMap.FindOrAdd(FileExtension);

			// Do not remap extensions, just reuse the existing UFactory.
			// There may be multiple UFactories, so we will keep track of all of them
			bool bFactoryAlreadyInMap = false;
			for(auto FoundFactoryIt = ExistingFactories.CreateConstIterator(); FoundFactoryIt; ++FoundFactoryIt)
			{
				if((*FoundFactoryIt)->GetClass() == SpecifiedFactory->GetClass())
				{
					bFactoryAlreadyInMap = true;
					break;
				}
			}

			if(!bFactoryAlreadyInMap)
			{
				// We found a factory for this file, it can be imported!
				// Create a new factory of the same class and make sure it doesnt get GCed.
				// The object will be removed from the root set at the end of this function.
				UFactory* NewFactory = NewObject<UFactory>(GetTransientPackage(), SpecifiedFactory->GetClass());
				if(NewFactory->ConfigureProperties())
				{
					NewFactory->AddToRoot();
					ExistingFactories.Add(NewFactory);
				}
			}
		}
	}

	// We need to sort the factories so that they get tested in priority order
	for(auto& ExtensionToFactories : ExtensionToFactoriesMap)
	{
		ExtensionToFactories.Value.Sort(&UFactory::SortFactoriesByPriority);
	}

	// Some flags to keep track of what the user decided when asked about overwriting or replacing
	bool bOverwriteAll = false;
	bool bReplaceAll = false;
	bool bDontOverwriteAny = false;
	bool bDontReplaceAny = false;

	// Now iterate over the input files and use the same factory object for each file with the same extension
	for(int32 FileIdx = 0; FileIdx < FilesAndDestinations.Num(); ++FileIdx)
	{
		const FString& Filename = FilesAndDestinations[FileIdx].Key;
		const FString& DestinationPath = FilesAndDestinations[FileIdx].Value;

		SlowTask.EnterProgressFrame(1, FText::Format(LOCTEXT("Import_ImportingFile", "Importing \"{0}\"..."), FText::FromString(FPaths::GetBaseFilename(Filename))));

		FString FileExtension = FPaths::GetExtension(Filename);

		const TArray<UFactory*>* FactoriesPtr = ExtensionToFactoriesMap.Find(FileExtension);
		UFactory* Factory = nullptr;
		// Assume that for automated import, the user knows exactly what factory to use if it exists
		if(bAutomatedImport && SpecifiedFactory && SpecifiedFactory->FactoryCanImport(Filename))
		{
			Factory = SpecifiedFactory;
		}
		else if(FactoriesPtr)
		{
			const TArray<UFactory*>& Factories = *FactoriesPtr;

			// Handle the potential of multiple factories being found
			if(Factories.Num() > 0)
			{
				Factory = Factories[0];

				for(auto FactoryIt = Factories.CreateConstIterator(); FactoryIt; ++FactoryIt)
				{
					UFactory* TestFactory = *FactoryIt;
					if(TestFactory->FactoryCanImport(Filename))
					{
						Factory = TestFactory;
						break;
					}
				}
			}
		}
		else
		{
			if(FEngineAnalytics::IsAvailable())
			{
				TArray<FAnalyticsEventAttribute> Attribs;
				Attribs.Add(FAnalyticsEventAttribute(TEXT("FileExtension"), FileExtension));

				FEngineAnalytics::GetProvider().RecordEvent(TEXT("Editor.Usage.ImportFailed"), Attribs);
			}

			const FText Message = FText::Format(LOCTEXT("ImportFailed_UnknownExtension", "Failed to import '{0}'. Unknown extension '{1}'."), FText::FromString(Filename), FText::FromString(FileExtension));
			FNotificationInfo Info(Message);
			Info.ExpireDuration = 3.0f;
			Info.bUseLargeFont = false;
			Info.bFireAndForget = true;
			Info.bUseSuccessFailIcons = true;
			FSlateNotificationManager::Get().AddNotification(Info)->SetCompletionState(SNotificationItem::CS_Fail);

			UE_LOG(LogAssetTools, Warning, TEXT("%s"), *Message.ToString());
		}

		if(Factory != nullptr)
		{
			// Reset the 'Do you want to overwrite the existing object?' Yes to All / No to All prompt, to make sure the
			// user gets a chance to select something
			Factory->ResetState();

			UClass* ImportAssetType = Factory->SupportedClass;
			bool bImportSucceeded = false;
			bool bImportWasCancelled = false;
			FDateTime ImportStartTime = FDateTime::UtcNow();

			FString Name = ObjectTools::SanitizeObjectName(FPaths::GetBaseFilename(Filename));
			FString PackageName = DestinationPath + TEXT("/") + Name;

			// We can not create assets that share the name of a map file in the same location
			if(FEditorFileUtils::IsMapPackageAsset(PackageName))
			{
				const FText Message = FText::Format(LOCTEXT("AssetNameInUseByMap", "You can not create an asset named '{0}' because there is already a map file with this name in this folder."), FText::FromString(Name));
				if(!bAutomatedImport)
				{
					FMessageDialog::Open(EAppMsgType::Ok, Message);
				}
				UE_LOG(LogAssetTools, Warning, TEXT("%s"), *Message.ToString());
				OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
				continue;
			}

			UPackage* Pkg = CreatePackage(nullptr, *PackageName);
			if(!ensure(Pkg))
			{
				// Failed to create the package to hold this asset for some reason
				OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
				continue;
			}

			// Make sure the destination package is loaded
			Pkg->FullyLoad();

			// Check for an existing object
			UObject* ExistingObject = StaticFindObject(UObject::StaticClass(), Pkg, *Name);
			if(ExistingObject != nullptr)
			{
				// If the existing object is one of the imports we've just created we can't replace or overwrite it
				if(ReturnObjects.Contains(ExistingObject))
				{
					if(ImportAssetType == nullptr)
					{
						// The factory probably supports multiple types and cant be determined yet without asking the user or actually loading it
						// We just need to generate an unused name so object should do fine.
						ImportAssetType = UObject::StaticClass();
					}
					// generate a unique name for this import
					Name = MakeUniqueObjectName(Pkg, ImportAssetType, *Name).ToString();
				}
				else
				{
					// If the object is supported by the factory we are using, ask if we want to overwrite the asset
					// Otherwise, prompt to replace the object
					if(Factory->DoesSupportClass(ExistingObject->GetClass()))
					{
						// The factory can overwrite this object, ask if that is okay, unless "Yes To All" or "No To All" was already selected
						EAppReturnType::Type UserResponse;

						if(bForceOverrideExisting || bOverwriteAll || GIsAutomationTesting)
						{
							UserResponse = EAppReturnType::YesAll;
						}
						else if(bDontOverwriteAny)
						{
							UserResponse = EAppReturnType::NoAll;
						}
						else
						{
							UserResponse = FMessageDialog::Open(
								EAppMsgType::YesNoYesAllNoAll,
								FText::Format(LOCTEXT("ImportObjectAlreadyExists_SameClass", "Do you want to overwrite the existing asset?\n\nAn asset already exists at the import location: {0}"), FText::FromString(PackageName)));

							bOverwriteAll = UserResponse == EAppReturnType::YesAll;
							bDontOverwriteAny = UserResponse == EAppReturnType::NoAll;
						}

						const bool bWantOverwrite = UserResponse == EAppReturnType::Yes || UserResponse == EAppReturnType::YesAll;

						if(!bWantOverwrite)
						{
							// User chose not to replace the package
							bImportWasCancelled = true;
							OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
							continue;
						}
					}
					else if(!bAutomatedImport)
					{
						// The factory can't overwrite this asset, ask if we should delete the object then import the new one. Only do this if "Yes To All" or "No To All" was not already selected.
						EAppReturnType::Type UserResponse;

						if(bReplaceAll)
						{
							UserResponse = EAppReturnType::YesAll;
						}
						else if(bDontReplaceAny)
						{
							UserResponse = EAppReturnType::NoAll;
						}
						else
						{
							UserResponse = FMessageDialog::Open(
								EAppMsgType::YesNoYesAllNoAll,
								FText::Format(LOCTEXT("ImportObjectAlreadyExists_DifferentClass", "Do you want to replace the existing asset?\n\nAn asset already exists at the import location: {0}"), FText::FromString(PackageName)));

							bReplaceAll = UserResponse == EAppReturnType::YesAll;
							bDontReplaceAny = UserResponse == EAppReturnType::NoAll;
						}

						const bool bWantReplace = UserResponse == EAppReturnType::Yes || UserResponse == EAppReturnType::YesAll;

						if(bWantReplace)
						{
							// Delete the existing object
							int32 NumObjectsDeleted = 0;
							TArray< UObject* > ObjectsToDelete;
							ObjectsToDelete.Add(ExistingObject);

							// If the user forcefully deletes the package, all sorts of things could become invalidated,
							// the Pkg pointer might be killed even though it was added to the root.
							TWeakObjectPtr<UPackage> WeakPkg(Pkg);

							// Dont let the package get garbage collected (just in case we are deleting the last asset in the package)
							Pkg->AddToRoot();
							NumObjectsDeleted = ObjectTools::DeleteObjects(ObjectsToDelete, /*bShowConfirmation=*/false);

							// If the weak package ptr is still valid, it should then be safe to remove it from the root.
							if(WeakPkg.IsValid())
							{
								Pkg->RemoveFromRoot();
							}

							const FString QualifiedName = PackageName + TEXT(".") + Name;
							FText Reason;
							if(NumObjectsDeleted == 0 || !IsUniqueObjectName(*QualifiedName, ANY_PACKAGE, Reason))
							{
								// Original object couldn't be deleted
								const FText Message = FText::Format(LOCTEXT("ImportDeleteFailed", "Failed to delete '{0}'. The asset is referenced by other content."), FText::FromString(PackageName));
								FMessageDialog::Open(EAppMsgType::Ok, Message);
								UE_LOG(LogAssetTools, Warning, TEXT("%s"), *Message.ToString());
								OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
								continue;
							}
							else
							{
								// succeed, recreate package since it has been deleted
								Pkg = CreatePackage(nullptr, *PackageName);
							}
						}
						else
						{
							// User chose not to replace the package
							bImportWasCancelled = true;
							OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
							continue;
						}
					}
				}
			}

			// Check for a package that was marked for delete in source control
			if(!CheckForDeletedPackage(Pkg))
			{
				OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
				continue;
			}

			Factory->SetAutomatedAssetImportData(Params.ImportData);

			ImportAssetType = Factory->ResolveSupportedClass();
			UObject* Result = Factory->ImportObject(ImportAssetType, Pkg, FName(*Name), RF_Public | RF_Standalone, Filename, nullptr, bImportWasCancelled);

			Factory->SetAutomatedAssetImportData(nullptr);

			// Do not report any error if the operation was canceled.
			if(!bImportWasCancelled)
			{
				if(Result)
				{
					ReturnObjects.Add(Result);

					// Notify the asset registry
					FAssetRegistryModule::AssetCreated(Result);
					GEditor->BroadcastObjectReimported(Result);

					bImportSucceeded = true;
				}
				else
				{
					const FText Message = FText::Format(LOCTEXT("ImportFailed_Generic", "Failed to import '{0}'. Failed to create asset '{1}'.\nPlease see Output Log for details."), FText::FromString(Filename), FText::FromString(PackageName));
					if(!bAutomatedImport)
					{
						FMessageDialog::Open(EAppMsgType::Ok, Message);
					}
					UE_LOG(LogAssetTools, Warning, TEXT("%s"), *Message.ToString());
				}
			}

			// Refresh the supported class.  Some factories (e.g. FBX) only resolve their type after reading the file
			ImportAssetType = Factory->ResolveSupportedClass();
			OnNewImportRecord(ImportAssetType, FileExtension, bImportSucceeded, bImportWasCancelled, ImportStartTime);
		}
		else
		{
			// A factory or extension was not found. The extension warning is above. If a factory was not found, the user likely canceled a factory configuration dialog.
		}
	}

	SlowTask.EnterProgressFrame(1);

	// Clean up and remove the factories we created from the root set
	for(auto ExtensionIt = ExtensionToFactoriesMap.CreateConstIterator(); ExtensionIt; ++ExtensionIt)
	{
		for(auto FactoryIt = ExtensionIt.Value().CreateConstIterator(); FactoryIt; ++FactoryIt)
		{
			(*FactoryIt)->CleanUp();
			(*FactoryIt)->RemoveFromRoot();
		}
	}

	// Sync content browser to the newly created assets
	if(ReturnObjects.Num() && (bSyncToBrowser != false))
	{
		FAssetTools::Get().SyncBrowserToAssets(ReturnObjects);
	}

	return ReturnObjects;
}

FAssetTools& FAssetTools::Get()
{
	FAssetToolsModule& Module = FModuleManager::GetModuleChecked<FAssetToolsModule>("AssetTools");
	return static_cast<FAssetTools&>(Module.Get());
}

void FAssetTools::SyncBrowserToAssets(const TArray<UObject*>& AssetsToSync)
{
	FContentBrowserModule& ContentBrowserModule = FModuleManager::Get().LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
	ContentBrowserModule.Get().SyncBrowserToAssets( AssetsToSync, /*bAllowLockedBrowsers=*/true );
}

void FAssetTools::SyncBrowserToAssets(const TArray<FAssetData>& AssetsToSync)
{
	FContentBrowserModule& ContentBrowserModule = FModuleManager::Get().LoadModuleChecked<FContentBrowserModule>("ContentBrowser");
	ContentBrowserModule.Get().SyncBrowserToAssets( AssetsToSync, /*bAllowLockedBrowsers=*/true );
}

bool FAssetTools::CheckForDeletedPackage(const UPackage* Package) const
{
	if ( ISourceControlModule::Get().IsEnabled() )
	{
		ISourceControlProvider& SourceControlProvider = ISourceControlModule::Get().GetProvider();
		if ( SourceControlProvider.IsAvailable() )
		{
			FSourceControlStatePtr SourceControlState = SourceControlProvider.GetState(Package, EStateCacheUsage::ForceUpdate);
			if ( SourceControlState.IsValid() && SourceControlState->IsDeleted() )
			{
				// Creating an asset in a package that is marked for delete - revert the delete and check out the package
				if (!SourceControlProvider.Execute(ISourceControlOperation::Create<FRevert>(), Package))
				{
					// Failed to revert file which was marked for delete
					FMessageDialog::Open(EAppMsgType::Ok, LOCTEXT("RevertDeletedFileFailed", "Failed to revert package which was marked for delete."));
					return false;
				}

				if (!SourceControlProvider.Execute(ISourceControlOperation::Create<FCheckOut>(), Package))
				{
					// Failed to check out file
					FMessageDialog::Open(EAppMsgType::Ok, LOCTEXT("CheckOutFileFailed", "Failed to check out package"));
					return false;
				}
			}
		}
		else
		{
			FMessageLog EditorErrors("EditorErrors");
			EditorErrors.Warning(LOCTEXT( "DeletingNoSCCConnection", "Could not check for deleted file. No connection to source control available!"));
			EditorErrors.Notify();
		}
	}

	return true;
}

bool FAssetTools::CanCreateAsset(const FString& AssetName, const FString& PackageName, const FText& OperationText) const
{
	// @todo: These 'reason' messages are not localized strings!
	FText Reason;
	if (!FName(*AssetName).IsValidObjectName( Reason )
		|| !FPackageName::IsValidLongPackageName( PackageName, /*bIncludeReadOnlyRoots=*/false, &Reason ) )
	{
		FMessageDialog::Open( EAppMsgType::Ok, Reason );
		return false;
	}

	// We can not create assets that share the name of a map file in the same location
	if ( FEditorFileUtils::IsMapPackageAsset(PackageName) )
	{
		FMessageDialog::Open( EAppMsgType::Ok, FText::Format( LOCTEXT("AssetNameInUseByMap", "You can not create an asset named '{0}' because there is already a map file with this name in this folder."), FText::FromString( AssetName ) ) );
		return false;
	}

	// Find (or create!) the desired package for this object
	UPackage* Pkg = CreatePackage(nullptr,*PackageName);

	// Handle fully loading packages before creating new objects.
	TArray<UPackage*> TopLevelPackages;
	TopLevelPackages.Add( Pkg );
	if( !PackageTools::HandleFullyLoadingPackages( TopLevelPackages, OperationText ) )
	{
		// User aborted.
		return false;
	}

	// We need to test again after fully loading.
	if (!FName(*AssetName).IsValidObjectName( Reason )
		||	!FPackageName::IsValidLongPackageName( PackageName, /*bIncludeReadOnlyRoots=*/false, &Reason ) )
	{
		FMessageDialog::Open( EAppMsgType::Ok, Reason );
		return false;
	}

	// Check for an existing object
	UObject* ExistingObject = StaticFindObject( UObject::StaticClass(), Pkg, *AssetName );
	if( ExistingObject != nullptr )
	{
		// Object already exists in either the specified package or another package.  Check to see if the user wants
		// to replace the object.
		bool bWantReplace =
			EAppReturnType::Yes == FMessageDialog::Open(
			EAppMsgType::YesNo,
			FText::Format(
				NSLOCTEXT("UnrealEd", "ReplaceExistingObjectInPackage_F", "An object [{0}] of class [{1}] already exists in file [{2}].  Do you want to replace the existing object?  If you click 'Yes', the existing object will be deleted.  Otherwise, click 'No' and choose a unique name for your new object." ),
				FText::FromString(AssetName), FText::FromString(ExistingObject->GetClass()->GetName()), FText::FromString(PackageName) ) );

		if( bWantReplace )
		{
			// Replacing an object.  Here we go!
			// Delete the existing object
			bool bDeleteSucceeded = ObjectTools::DeleteSingleObject( ExistingObject );

			if (bDeleteSucceeded)
			{
				// Force GC so we can cleanly create a new asset (and not do an 'in place' replacement)
				CollectGarbage( GARBAGE_COLLECTION_KEEPFLAGS );

				// Old package will be GC'ed... create a new one here
				Pkg = CreatePackage(nullptr,*PackageName);
			}
			else
			{
				// Notify the user that the operation failed b/c the existing asset couldn't be deleted
				FMessageDialog::Open( EAppMsgType::Ok,	FText::Format( NSLOCTEXT("DlgNewGeneric", "ContentBrowser_CannotDeleteReferenced", "{0} wasn't created.\n\nThe asset is referenced by other content."), FText::FromString( AssetName ) ) );
			}

			if( !bDeleteSucceeded || !IsUniqueObjectName( *AssetName, Pkg, Reason ) )
			{
				// Original object couldn't be deleted
				return false;
			}
		}
		else
		{
			// User chose not to replace the object; they'll need to enter a new name
			return false;
		}
	}

	// Check for a package that was marked for delete in source control
	if ( !CheckForDeletedPackage(Pkg) )
	{
		return false;
	}

	return true;
}

void FAssetTools::PerformMigratePackages(TArray<FName> PackageNamesToMigrate) const
{
	// Form a full list of packages to move by including the dependencies of the supplied packages
	TSet<FName> AllPackageNamesToMove;
	{
		FScopedSlowTask SlowTask( PackageNamesToMigrate.Num(), LOCTEXT( "MigratePackages_GatheringDependencies", "Gathering Dependencies..." ) );
		SlowTask.MakeDialog();

		for ( auto PackageIt = PackageNamesToMigrate.CreateConstIterator(); PackageIt; ++PackageIt )
		{
			SlowTask.EnterProgressFrame();

			if ( !AllPackageNamesToMove.Contains(*PackageIt) )
			{
				AllPackageNamesToMove.Add(*PackageIt);
				RecursiveGetDependencies(*PackageIt, AllPackageNamesToMove);
			}
		}
	}

	// Confirm that there is at least one package to move 
	if ( AllPackageNamesToMove.Num() == 0 )
	{
		FMessageDialog::Open(EAppMsgType::Ok, LOCTEXT("MigratePackages_NoFilesToMove", "No files were found to move"));
		return;
	}

	// Prompt the user displaying all assets that are going to be migrated
	{
		const FText ReportMessage = LOCTEXT("MigratePackagesReportTitle", "The following assets will be migrated to another content folder.");
		TArray<FString> ReportPackageNames;
		for ( auto PackageIt = AllPackageNamesToMove.CreateConstIterator(); PackageIt; ++PackageIt )
		{
			ReportPackageNames.Add((*PackageIt).ToString());
		}
		SPackageReportDialog::FOnReportConfirmed OnReportConfirmed = SPackageReportDialog::FOnReportConfirmed::CreateRaw(this, &FAssetTools::MigratePackages_ReportConfirmed, ReportPackageNames);
		SPackageReportDialog::OpenPackageReportDialog(ReportMessage, ReportPackageNames, OnReportConfirmed);
	}
}

void FAssetTools::MigratePackages_ReportConfirmed(TArray<FString> ConfirmedPackageNamesToMigrate) const
{
	// Choose a destination folder
	IDesktopPlatform* DesktopPlatform = FDesktopPlatformModule::Get();
	FString DestinationFolder;
	if ( ensure(DesktopPlatform) )
	{
		const void* ParentWindowWindowHandle = FSlateApplication::Get().FindBestParentWindowHandleForDialogs(nullptr);

		const FString Title = LOCTEXT("MigrateToFolderTitle", "Choose a destination Content folder").ToString();
		bool bFolderAccepted = false;
		while (!bFolderAccepted)
		{
			const bool bFolderSelected = DesktopPlatform->OpenDirectoryDialog(
				ParentWindowWindowHandle,
				Title,
				FEditorDirectories::Get().GetLastDirectory(ELastDirectory::GENERIC_EXPORT),
				DestinationFolder
				);

			if ( !bFolderSelected )
			{
				// User canceled, return
				return;
			}

			FEditorDirectories::Get().SetLastDirectory(ELastDirectory::GENERIC_EXPORT, DestinationFolder);
			FPaths::NormalizeFilename(DestinationFolder);
			if ( !DestinationFolder.EndsWith(TEXT("/")) )
			{
				DestinationFolder += TEXT("/");
			}

			// Verify that it is a content folder
			if ( DestinationFolder.EndsWith(TEXT("/Content/")) )
			{
				bFolderAccepted = true;
			}
			else
			{
				// The user chose a non-content folder. Confirm that this was their intention.
				const FText Message = FText::Format(LOCTEXT("MigratePackages_NonContentFolder", "{0} does not appear to be a game Content folder. Migrated content will only work properly if placed in a Content folder. Would you like to place your content here anyway?"), FText::FromString(DestinationFolder));
				EAppReturnType::Type Response = FMessageDialog::Open(EAppMsgType::YesNo, Message);
				bFolderAccepted = (Response == EAppReturnType::Yes);
			}
		}
	}
	else
	{
		// Not on a platform that supports desktop functionality
		FMessageDialog::Open(EAppMsgType::Ok, LOCTEXT("NoDesktopPlatform", "Error: This platform does not support a file dialog."));
		return;
	}

	bool bUserCanceled = false;

	// Copy all specified assets and their dependencies to the destination folder
	FScopedSlowTask SlowTask( 2, LOCTEXT( "MigratePackages_CopyingFiles", "Copying Files..." ) );
	SlowTask.MakeDialog();

	EAppReturnType::Type LastResponse = EAppReturnType::Yes;
	TArray<FString> SuccessfullyCopiedFiles;
	TArray<FString> SuccessfullyCopiedPackages;
	FString CopyErrors;

	SlowTask.EnterProgressFrame();
	{
		FScopedSlowTask LoopProgress(ConfirmedPackageNamesToMigrate.Num());
		for ( auto PackageNameIt = ConfirmedPackageNamesToMigrate.CreateConstIterator(); PackageNameIt; ++PackageNameIt )
		{
			LoopProgress.EnterProgressFrame();

			const FString& PackageName = *PackageNameIt;
			FString SrcFilename;
			if ( !FPackageName::DoesPackageExist(PackageName, nullptr, &SrcFilename) )
			{
				const FText ErrorMessage = FText::Format(LOCTEXT("MigratePackages_PackageMissing", "{0} does not exist on disk."), FText::FromString(PackageName));
				UE_LOG(LogAssetTools, Warning, TEXT("%s"), *ErrorMessage.ToString());
				CopyErrors += ErrorMessage.ToString() + LINE_TERMINATOR;
			}
			else if (SrcFilename.Contains(FPaths::EngineContentDir()))
			{
				const FString LeafName = SrcFilename.Replace(*FPaths::EngineContentDir(), TEXT("Engine/"));
				CopyErrors += FText::Format(LOCTEXT("MigratePackages_EngineContent", "Unable to migrate Engine asset {0}. Engine assets cannot be migrated."), FText::FromString(LeafName)).ToString() + LINE_TERMINATOR;
			}
			else
			{
				const FString DestFilename = SrcFilename.Replace(*FPaths::GameContentDir(), *DestinationFolder);

				bool bFileOKToCopy = true;
				if ( IFileManager::Get().FileSize(*DestFilename) > 0 )
				{
					// The destination file already exists! Ask the user what to do.
					EAppReturnType::Type Response;
					if ( LastResponse == EAppReturnType::YesAll || LastResponse == EAppReturnType::NoAll )
					{
						Response = LastResponse;
					}
					else
					{
						const FText Message = FText::Format( LOCTEXT("MigratePackages_AlreadyExists", "An asset already exists at location {0} would you like to overwrite it?"), FText::FromString(DestFilename) );
						Response = FMessageDialog::Open( EAppMsgType::YesNoYesAllNoAllCancel, Message );
						if ( Response == EAppReturnType::Cancel )
						{
							// The user chose to cancel mid-operation. Break out.
							bUserCanceled = true;
							break;
						}
						LastResponse = Response;
					}

					const bool bWantOverwrite = Response == EAppReturnType::Yes || Response == EAppReturnType::YesAll;
					if( !bWantOverwrite )
					{
						// User chose not to replace the package
						bFileOKToCopy = false;
					}
				}

				if ( bFileOKToCopy )
				{
					if ( IFileManager::Get().Copy(*DestFilename, *SrcFilename) == COPY_OK )
					{
						SuccessfullyCopiedPackages.Add(PackageName);
						SuccessfullyCopiedFiles.Add(DestFilename);
					}
					else
					{
						UE_LOG(LogAssetTools, Warning, TEXT("Failed to copy %s to %s while migrating assets"), *SrcFilename, *DestFilename);
						CopyErrors += SrcFilename + LINE_TERMINATOR;
					}
				}
			}
		}
	}

	FString SourceControlErrors;
	SlowTask.EnterProgressFrame();

	if ( !bUserCanceled && SuccessfullyCopiedFiles.Num() > 0 )
	{
		// attempt to add files to source control (this can quite easily fail, but if it works it is very useful)
		if(GetDefault<UEditorLoadingSavingSettings>()->bSCCAutoAddNewFiles)
		{
			if(ISourceControlModule::Get().IsEnabled())
			{
				ISourceControlProvider& SourceControlProvider = ISourceControlModule::Get().GetProvider();
				if(SourceControlProvider.Execute(ISourceControlOperation::Create<FMarkForAdd>(), SuccessfullyCopiedFiles) == ECommandResult::Failed)
				{
					FScopedSlowTask LoopProgress(SuccessfullyCopiedFiles.Num());

					for(auto FileIt(SuccessfullyCopiedFiles.CreateConstIterator()); FileIt; FileIt++)
					{
						LoopProgress.EnterProgressFrame();
						if(!SourceControlProvider.GetState(*FileIt, EStateCacheUsage::Use)->IsAdded())
						{
							SourceControlErrors += FText::Format(LOCTEXT("MigratePackages_SourceControlError", "{0} could not be added to source control"), FText::FromString(*FileIt)).ToString();
							SourceControlErrors += LINE_TERMINATOR;
						}
					}
				}
			}
		}
	}

	FMessageLog MigrateLog("AssetTools");
	FText LogMessage = FText::FromString(TEXT("Content migration completed successfully!"));
	EMessageSeverity::Type Severity = EMessageSeverity::Info;
	if ( CopyErrors.Len() > 0 || SourceControlErrors.Len() > 0 )
	{
		FString ErrorMessage;
		Severity = EMessageSeverity::Error;
		if( CopyErrors.Len() > 0 )
		{
			MigrateLog.NewPage( LOCTEXT("MigratePackages_CopyErrorsPage", "Copy Errors") );
			MigrateLog.Error(FText::FromString(*CopyErrors));
			ErrorMessage += FText::Format(LOCTEXT( "MigratePackages_CopyErrors", "Copied {0} files. Some content could not be copied."), FText::AsNumber(SuccessfullyCopiedPackages.Num())).ToString();
		}
		if( SourceControlErrors.Len() > 0 )
		{
			MigrateLog.NewPage( LOCTEXT("MigratePackages_SourceControlErrorsListPage", "Source Control Errors") );
			MigrateLog.Error(FText::FromString(*SourceControlErrors));
			ErrorMessage += LINE_TERMINATOR;
			ErrorMessage += LOCTEXT( "MigratePackages_SourceControlErrorsList", "Some files reported source control errors.").ToString();
		}
		if ( SuccessfullyCopiedPackages.Num() > 0 )
		{
			MigrateLog.NewPage( LOCTEXT("MigratePackages_CopyErrorsSuccesslistPage", "Copied Successfully") );
			MigrateLog.Info(FText::FromString(*SourceControlErrors));
			ErrorMessage += LINE_TERMINATOR;
			ErrorMessage += LOCTEXT( "MigratePackages_CopyErrorsSuccesslist", "Some files were copied successfully.").ToString();
			for ( auto FileIt = SuccessfullyCopiedPackages.CreateConstIterator(); FileIt; ++FileIt )
			{
				if(FileIt->Len()>0)
				{
					MigrateLog.Info(FText::FromString(*FileIt));
				}
			}
		}
		LogMessage = FText::FromString(ErrorMessage);
	}
	else if ( !bUserCanceled )
	{
		MigrateLog.NewPage( LOCTEXT("MigratePackages_CompletePage", "Content migration completed successfully!") );
		for ( auto FileIt = SuccessfullyCopiedPackages.CreateConstIterator(); FileIt; ++FileIt )
		{
			if(FileIt->Len()>0)
			{
				MigrateLog.Info(FText::FromString(*FileIt));
			}
		}
	}
	MigrateLog.Notify(LogMessage, Severity, true);
}

void FAssetTools::RecursiveGetDependencies(const FName& PackageName, TSet<FName>& AllDependencies) const
{
	FAssetRegistryModule& AssetRegistryModule = FModuleManager::Get().LoadModuleChecked<FAssetRegistryModule>(TEXT("AssetRegistry"));
	TArray<FName> Dependencies;
	AssetRegistryModule.Get().GetDependencies(PackageName, Dependencies);
	
	for ( auto DependsIt = Dependencies.CreateConstIterator(); DependsIt; ++DependsIt )
	{
		if ( !AllDependencies.Contains(*DependsIt) )
		{
			// @todo Make this skip all packages whose root is different than the source package list root. For now we just skip engine content.
			const bool bIsEnginePackage = (*DependsIt).ToString().StartsWith(TEXT("/Engine"));
			const bool bIsScriptPackage = (*DependsIt).ToString().StartsWith(TEXT("/Script"));
			if ( !bIsEnginePackage && !bIsScriptPackage )
			{
				AllDependencies.Add(*DependsIt);
				RecursiveGetDependencies(*DependsIt, AllDependencies);
			}
		}
	}
}

void FAssetTools::FixupReferencers(const TArray<UObjectRedirector*>& Objects) const
{
	AssetFixUpRedirectors->FixupReferencers(Objects);
}

#undef LOCTEXT_NAMESPACE