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#include "RegionsHierarchy.h"
#include <IO/WriteHelpers.h>
#include <Poco/Exception.h>
#include <Poco/Util/Application.h>
#include <Common/logger_useful.h>
#include "GeodataProviders/IHierarchiesProvider.h"
namespace DB
{
namespace ErrorCodes
{
extern const int INCORRECT_DATA;
}
}
RegionsHierarchy::RegionsHierarchy(IRegionsHierarchyDataSourcePtr data_source_) : data_source(data_source_)
{
}
void RegionsHierarchy::reload()
{
Poco::Logger * log = &Poco::Logger::get("RegionsHierarchy");
if (!data_source->isModified())
return;
LOG_DEBUG(log, "Reloading regions hierarchy");
const size_t initial_size = 10000;
const size_t max_size = 15000000;
RegionParents new_parents(initial_size);
RegionParents new_city(initial_size);
RegionParents new_country(initial_size);
RegionParents new_area(initial_size);
RegionParents new_district(initial_size);
RegionParents new_continent(initial_size);
RegionParents new_top_continent(initial_size);
RegionPopulations new_populations(initial_size);
RegionDepths new_depths(initial_size);
RegionTypes types(initial_size);
RegionID max_region_id = 0;
auto regions_reader = data_source->createReader();
RegionEntry region_entry;
while (regions_reader->readNext(region_entry))
{
if (region_entry.id > max_region_id)
{
if (region_entry.id > max_size)
throw DB::Exception(DB::ErrorCodes::INCORRECT_DATA,
"Region id is too large: {}, should be not more than {}",
DB::toString(region_entry.id), DB::toString(max_size));
max_region_id = region_entry.id;
while (region_entry.id >= new_parents.size())
{
new_parents.resize(new_parents.size() * 2);
new_populations.resize(new_parents.size());
types.resize(new_parents.size());
}
}
new_parents[region_entry.id] = region_entry.parent_id;
new_populations[region_entry.id] = region_entry.population;
types[region_entry.id] = region_entry.type;
}
new_parents.resize(max_region_id + 1);
new_city.resize(max_region_id + 1);
new_country.resize(max_region_id + 1);
new_area.resize(max_region_id + 1);
new_district.resize(max_region_id + 1);
new_continent.resize(max_region_id + 1);
new_top_continent.resize(max_region_id + 1);
new_populations.resize(max_region_id + 1);
new_depths.resize(max_region_id + 1);
types.resize(max_region_id + 1);
/// prescribe the cities and countries for the regions
for (RegionID i = 0; i <= max_region_id; ++i)
{
if (types[i] == RegionType::City)
new_city[i] = i;
if (types[i] == RegionType::Area)
new_area[i] = i;
if (types[i] == RegionType::District)
new_district[i] = i;
if (types[i] == RegionType::Country)
new_country[i] = i;
if (types[i] == RegionType::Continent)
{
new_continent[i] = i;
new_top_continent[i] = i;
}
RegionDepth depth = 0;
RegionID current = i;
while (true)
{
++depth;
if (depth == std::numeric_limits<RegionDepth>::max())
throw Poco::Exception(
"Logical error in regions hierarchy: region " + DB::toString(current) + " possible is inside infinite loop");
current = new_parents[current];
if (current == 0)
break;
if (current > max_region_id)
throw Poco::Exception(
"Logical error in regions hierarchy: region " + DB::toString(current) + " (specified as parent) doesn't exist");
if (types[current] == RegionType::City)
new_city[i] = current;
if (types[current] == RegionType::Area)
new_area[i] = current;
if (types[current] == RegionType::District)
new_district[i] = current;
if (types[current] == RegionType::Country)
new_country[i] = current;
if (types[current] == RegionType::Continent)
{
if (!new_continent[i])
new_continent[i] = current;
new_top_continent[i] = current;
}
}
new_depths[i] = depth;
}
parents.swap(new_parents);
country.swap(new_country);
city.swap(new_city);
area.swap(new_area);
district.swap(new_district);
continent.swap(new_continent);
top_continent.swap(new_top_continent);
populations.swap(new_populations);
depths.swap(new_depths);
}
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