SetCachePageIterator.h

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 *  Copyright 2018 Rice University                                           *
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 *  Licensed under the Apache License, Version 2.0 (the "License");          *
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#ifndef SETCACHEPAGEITERATOR_H
#define SETCACHEPAGEITERATOR_H


#include "UserSet.h"
#include "DataTypes.h"
#include "PageCache.h"
#include "PageIterator.h"
#include <set>
#include <memory>
using namespace std;
class SetCachePageIterator;

typedef shared_ptr<SetCachePageIterator> SetCachePageIteratorPtr;

class SetCachePageIterator : public PageIteratorInterface {
public:
    // NOTE: the constructor can only be invoked in UserSet::getIterators(), where it will be
    // protected by lockDirtyPageSet();
    SetCachePageIterator(PageCachePtr cache, UserSet* set);
    virtual ~SetCachePageIterator();

    PDBPagePtr begin();

    PDBPagePtr end();

    PDBPagePtr next() override;

    bool hasNext() override;

private:
    PageCachePtr cache;
    UserSet* set;
    std::unordered_map<PageID, FileSearchKey>::iterator iter;
};


#endif /* SETCACHEPAGEITERATOR_H */