UObject* UObjectPropertyBase::FindImportedObject( const UProperty* Property, UObject* OwnerObject, UClass* ObjectClass, UClass* RequiredMetaClass, const TCHAR* Text, uint32 PortFlags/*=0*/ )
{
UObject* Result = NULL;
check( ObjectClass->IsChildOf(RequiredMetaClass) );
bool AttemptNonQualifiedSearch = (PortFlags & PPF_AttemptNonQualifiedSearch) != 0;
// if we are importing default properties, first look for a matching subobject by
// looking through the archetype chain at each outer and stop once the outer chain reaches the owning class's default object
if (PortFlags & PPF_ParsingDefaultProperties)
{
for (UObject* SearchStart = OwnerObject; Result == NULL && SearchStart != NULL; SearchStart = SearchStart->GetOuter())
{
UObject* ScopedSearchRoot = SearchStart;
while (Result == NULL && ScopedSearchRoot != NULL)
{
Result = StaticFindObject(ObjectClass, ScopedSearchRoot, Text);
// don't think it's possible to get a non-subobject here, but it doesn't hurt to check
if (Result != NULL && !Result->IsTemplate(RF_ClassDefaultObject))
{
Result = NULL;
}
ScopedSearchRoot = ScopedSearchRoot->GetArchetype();
}
if (SearchStart->HasAnyFlags(RF_ClassDefaultObject))
{
break;
}
}
}
// if we have a parent, look in the parent, then it's outer, then it's outer, ...
// this is because exported object properties that point to objects in the level aren't
// fully qualified, and this will step up the nested object chain to solve any name
// collisions within a nested object tree
UObject* ScopedSearchRoot = OwnerObject;
while (Result == NULL && ScopedSearchRoot != NULL)
{
Result = StaticFindObject(ObjectClass, ScopedSearchRoot, Text);
// disallow class default subobjects here while importing defaults
// this prevents the use of a subobject name that doesn't exist in the scope of the default object being imported
// from grabbing some other subobject with the same name and class in some other arbitrary default object
if (Result != NULL && (PortFlags & PPF_ParsingDefaultProperties) && Result->IsTemplate(RF_ClassDefaultObject))
{
Result = NULL;
}
ScopedSearchRoot = ScopedSearchRoot->GetOuter();
}
if (Result == NULL)
{
// attempt to find a fully qualified object
Result = StaticFindObject(ObjectClass, NULL, Text);
if (Result == NULL)
{
// match any object of the correct class whose path contains the specified path
Result = StaticFindObject(ObjectClass, ANY_PACKAGE, Text);
// disallow class default subobjects here while importing defaults
if (Result != NULL && (PortFlags & PPF_ParsingDefaultProperties) && Result->IsTemplate(RF_ClassDefaultObject))
{
Result = NULL;
}
}
}
// if we haven;t found it yet, then try to find it without a qualified name
if (!Result)
{
const TCHAR* Dot = FCString::Strrchr(Text, '.');
if (Dot && AttemptNonQualifiedSearch)
{
// search with just the object name
Result = FindImportedObject(Property, OwnerObject, ObjectClass, RequiredMetaClass, Dot + 1);
}
FString NewText(Text);
// if it didn't have a dot, then maybe they just gave a uasset package name
if (!Dot && !Result)
{
int32 LastSlash = NewText.Find(TEXT("/"), ESearchCase::CaseSensitive, ESearchDir::FromEnd);
if (LastSlash >= 0)
{
NewText += TEXT(".");
NewText += (Text + LastSlash + 1);
Dot = FCString::Strrchr(*NewText, '.');
}
}
// If we still can't find it, try to load it. (Only try to load fully qualified names)
if(!Result && Dot)
{
#if USE_CIRCULAR_DEPENDENCY_LOAD_DEFERRING
FLinkerLoad* Linker = (OwnerObject != nullptr) ? OwnerObject->GetClass()->GetLinker() : nullptr;
const bool bDeferAssetImports = (Linker != nullptr) && (Linker->LoadFlags & LOAD_DeferDependencyLoads);
if (bDeferAssetImports)
{
Result = Linker->RequestPlaceholderValue(ObjectClass, Text);
}
if (Result == nullptr)
#endif // USE_CIRCULAR_DEPENDENCY_LOAD_DEFERRING
{
uint32 LoadFlags = LOAD_NoWarn | LOAD_FindIfFail;
UE_LOG(LogProperty, Verbose, TEXT("FindImportedObject is attempting to import [%s] (class = %s) with StaticLoadObject"), Text, *GetFullNameSafe(ObjectClass));
Result = StaticLoadObject(ObjectClass, NULL, Text, NULL, LoadFlags, NULL);
#if USE_DEFERRED_DEPENDENCY_CHECK_VERIFICATION_TESTS
check(!bDeferAssetImports || !Result || !FBlueprintSupport::IsInBlueprintPackage(Result));
#endif // USE_DEFERRED_DEPENDENCY_CHECK_VERIFICATION_TESTS
}
}
}
// if we found an object, and we have a parent, make sure we are in the same package if the found object is private, unless it's a cross level property
if (Result && !Result->HasAnyFlags(RF_Public) && OwnerObject && Result->GetOutermost() != OwnerObject->GetOutermost())
{
const UObjectPropertyBase* ObjectProperty = dynamic_cast<const UObjectPropertyBase*>(Property);
if ( !ObjectProperty || !ObjectProperty->AllowCrossLevel())
{
UE_LOG(LogProperty, Warning, TEXT("Illegal TEXT reference to a private object in external package (%s) from referencer (%s). Import failed..."), *Result->GetFullName(), *OwnerObject->GetFullName());
Result = NULL;
}
}
check(!Result || Result->IsA(RequiredMetaClass));
return Result;
}
