CollectionHierarchyFacade.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "GeometryCollection/ManagedArrayAccessor.h"
#include "GeometryCollection/ManagedArrayCollection.h"
 
namespace Chaos::Facades
{
    class FCollectionHierarchyFacade
    {
    public:
        enum class EPersistencePolicy : uint8
        {
            KeepExistingPersistence,
            MustBePersistent
        };
 
        CHAOS_API FCollectionHierarchyFacade(FManagedArrayCollection& InCollection);
        CHAOS_API FCollectionHierarchyFacade(const FManagedArrayCollection& InCollection);
 
        void DefineSchema() {}
 
        CHAOS_API bool IsValid() const;
 
        bool IsConst() const { return ParentAttribute.IsConst(); }
 
        CHAOS_API bool HasLevelAttribute() const;
 
        CHAOS_API bool IsLevelAttributePersistent() const;
 
        CHAOS_API int32 GetRootIndex() const;
 
        CHAOS_API TArray<int32> GetRootIndices() const;
 
        CHAOS_API TArray<int32> GetChildrenAsArray(int32 TransformIndex) const;
 
        CHAOS_API const TSet<int32>* FindChildren(int32 TransformIndex) const;
 
        CHAOS_API int32 GetParent(int32 TransformIndex) const;
 
        CHAOS_API void EnumerateChildTransforms(int32 TransformIndex, TFunctionRef<bool(int32)> ShouldProcess, TFunctionRef<void(int32)> ProcessTransformFunc) const;
 
        CHAOS_API int32 GetInitialLevel(int32 TransformIndex) const;
 
        CHAOS_API void GenerateLevelAttribute();
 
        CHAOS_API TArray<int32> GetTransformArrayInDepthFirstOrder() const;
 
        CHAOS_API TArray<int32> ComputeTransformIndicesInDepthFirstOrder() const;
 
        CHAOS_API TArray<int32> ComputeTransformIndicesInBreadthFirstOrder() const;
 
        CHAOS_API void GenerateBreadthFirstOrderIndicesAttribute();
 
        CHAOS_API const TArray<int32>& GetBreadthFirstOrderIndicesFromAttribute() const;
 
    public:
        static CHAOS_API TArray<int32> GetRootIndices(const TManagedArrayAccessor<int32>& ParentAttribute);
 
    private:
        TManagedArrayAccessor<int32>        ParentAttribute;
        TManagedArrayAccessor<TSet<int32>>  ChildrenAttribute;
        TManagedArrayAccessor<int32>        LevelAttribute;
    };
}