record_store_v1_simple_iterator.h

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#pragma once

#include "mongo/db/storage/mmap_v1/diskloc.h"
#include "mongo/db/storage/record_store.h"

namespace mongo {

class SimpleRecordStoreV1;

class SimpleRecordStoreV1Iterator final : public SeekableRecordCursor {
public:
    SimpleRecordStoreV1Iterator(OperationContext* opCtx,
                                const SimpleRecordStoreV1* records,
                                bool forward);

    boost::optional<Record> next() final;
    boost::optional<Record> seekExact(const RecordId& id) final;
    void save() final;
    bool restore() final;
    void detachFromOperationContext() final {
        _opCtx = nullptr;
    }
    void reattachToOperationContext(OperationContext* opCtx) final {
        _opCtx = opCtx;
    }
    void invalidate(OperationContext* opCtx, const RecordId& dl) final;
    std::unique_ptr<RecordFetcher> fetcherForNext() const final;
    std::unique_ptr<RecordFetcher> fetcherForId(const RecordId& id) const final;

private:
    void advance();
    bool isEOF() {
        return _curr.isNull();
    }

    // for getNext, not owned
    OperationContext* _opCtx;

    // The result returned on the next call to getNext().
    DiskLoc _curr;
    const SimpleRecordStoreV1* const _recordStore;
    const bool _forward;
};

}  // namespace mongo