StructuredArchiveChildReader.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "HAL/Platform.h"
#include "Misc/Build.h"
#include "Misc/Optional.h"
#include "Serialization/StructuredArchive.h"
#include "Serialization/StructuredArchiveSlots.h"
 
class FStructuredArchive;
class FStructuredArchiveFormatter;
 
/**
 * FStructuredArchiveChildReader
 *
 * Utility class for easily creating a structured archive that covers the data hierarchy underneath
 * the given slot
 *
 * Allows serialization code to get an archive instance for the current location, so that it can return to it
 * later on after the master archive has potentially moved on into a different location in the file.
 */
class FStructuredArchiveChildReader
{
public:
    explicit FStructuredArchiveChildReader(FStructuredArchiveSlot InSlot);
    ~FStructuredArchiveChildReader();
 
    // Non-copyable
    FStructuredArchiveChildReader(FStructuredArchiveChildReader&&) = delete;
    FStructuredArchiveChildReader(const FStructuredArchiveChildReader&) = delete;
    FStructuredArchiveChildReader& operator=(FStructuredArchiveChildReader&&) = delete;
    FStructuredArchiveChildReader& operator=(const FStructuredArchiveChildReader&) = delete;
 
    FORCEINLINE FStructuredArchiveSlot GetRoot() const
    {
        return Root.GetValue();
    }
 
private:
    FStructuredArchiveFormatter* OwnedFormatter;
    FStructuredArchive* StructuredArchive;
    TOptional<FStructuredArchiveSlot> Root;
};
 
#if !WITH_TEXT_ARCHIVE_SUPPORT
 
FORCEINLINE FStructuredArchiveChildReader::FStructuredArchiveChildReader(FStructuredArchiveSlot InSlot)
    : OwnedFormatter(nullptr)
    , StructuredArchive(nullptr)
{
    StructuredArchive = new FStructuredArchive(InSlot.StructuredArchive.Formatter);
    Root.Emplace(StructuredArchive->Open());
}
 
FORCEINLINE FStructuredArchiveChildReader::~FStructuredArchiveChildReader()
{
    delete StructuredArchive;
}
 
#endif