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#pragma once
#include "types.h"
#include <library/cpp/tvmauth/client/exception.h>
#include <set>
#include <vector>
namespace NTvmAuth::NRoles {
class TEntitiesIndex: TMoveOnly {
public:
struct TSubTree;
using TIdxByAttrs = THashMap<TKeyValue, TSubTree>;
struct TSubTree {
std::vector<TEntityPtr> Entities;
TIdxByAttrs SubTree;
};
class TStage {
public:
TStage(const std::set<TString>& k);
bool GetNextKeySet(std::vector<TString>& out);
private:
std::vector<TString> Keys_;
size_t Id_ = 0;
};
public:
TEntitiesIndex(const std::vector<TEntityPtr>& entities);
/**
* Iterators must be to sorted unique key/value
*/
template <typename Iterator>
bool ContainsExactEntity(Iterator begin, Iterator end) const;
/**
* Iterators must be to sorted unique key/value
*/
template <typename Iterator>
const std::vector<TEntityPtr>& GetEntitiesWithAttrs(Iterator begin, Iterator end) const;
public: // for tests
static std::set<TString> GetUniqueSortedKeys(const std::vector<TEntityPtr>& entities);
static void MakeUnique(TEntitiesIndex::TSubTree& branch);
TString PrintDebugString() const;
private:
template <typename Iterator>
const TSubTree* FindSubtree(Iterator begin, Iterator end, size_t& size) const;
private:
TSubTree Idx_;
std::vector<TEntityPtr> EmptyResult_;
};
template <typename Iterator>
bool TEntitiesIndex::ContainsExactEntity(Iterator begin, Iterator end) const {
size_t size = 0;
const TSubTree* subtree = FindSubtree(begin, end, size);
if (!subtree) {
return false;
}
auto res = std::find_if(
subtree->Entities.begin(),
subtree->Entities.end(),
[size](const auto& e) { return size == e->size(); });
return res != subtree->Entities.end();
}
template <typename Iterator>
const std::vector<TEntityPtr>& TEntitiesIndex::GetEntitiesWithAttrs(Iterator begin, Iterator end) const {
size_t size = 0;
const TSubTree* subtree = FindSubtree(begin, end, size);
if (!subtree) {
return EmptyResult_;
}
return subtree->Entities;
}
template <typename Iterator>
const TEntitiesIndex::TSubTree* TEntitiesIndex::FindSubtree(Iterator begin,
Iterator end,
size_t& size) const {
const TSubTree* subtree = &Idx_;
size = 0;
for (auto attr = begin; attr != end; ++attr) {
auto it = subtree->SubTree.find(TKeyValueView{attr->first, attr->second});
if (it == subtree->SubTree.end()) {
return nullptr;
}
++size;
subtree = &it->second;
}
return subtree;
}
}
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