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#pragma once
#include "IHierarchiesProvider.h"
#include <unordered_map>
#include <Common/FileUpdatesTracker.h>
// Represents local file with regions hierarchy dump
class RegionsHierarchyDataSource : public IRegionsHierarchyDataSource
{
private:
std::string path;
FileUpdatesTracker updates_tracker;
public:
explicit RegionsHierarchyDataSource(const std::string & path_) : path(path_), updates_tracker(path_) {}
bool isModified() const override;
IRegionsHierarchyReaderPtr createReader() override;
};
// Provides access to directory with multiple data source files: one file per regions hierarchy
class RegionsHierarchiesDataProvider : public IRegionsHierarchiesDataProvider
{
private:
// path to file with default regions hierarchy
std::string path;
using HierarchyFiles = std::unordered_map<std::string, std::string>;
HierarchyFiles hierarchy_files;
public:
/** path must point to the file with the hierarchy of regions "by default". It will be accessible by an empty key.
* In addition, a number of files are searched for, the name of which (before the extension, if any) is added arbitrary _suffix.
* Such files are loaded, and the hierarchy of regions is put on the `suffix` key.
*
* For example, if /opt/geo/regions_hierarchy.txt is specified,
* then the /opt/geo/regions_hierarchy_ua.txt file will also be loaded, if any, it will be accessible by the `ua` key.
*/
explicit RegionsHierarchiesDataProvider(const std::string & path_);
std::vector<std::string> listCustomHierarchies() const override;
IRegionsHierarchyDataSourcePtr getDefaultHierarchySource() const override;
IRegionsHierarchyDataSourcePtr getHierarchySource(const std::string & name) const override;
private:
void discoverFilesWithCustomHierarchies();
};
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