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#include "HierarchyFormatReader.h"
#include <IO/ReadHelpers.h>
#include <IO/WriteHelpers.h>
bool RegionsHierarchyFormatReader::readNext(RegionEntry & entry)
{
while (!input->eof())
{
/** Our internal geobase has negative numbers,
* that means "this is garbage, ignore this row".
*/
Int32 read_region_id = 0;
Int32 read_parent_id = 0;
Int8 read_type = 0;
DB::readIntText(read_region_id, *input);
DB::assertChar('\t', *input);
DB::readIntText(read_parent_id, *input);
DB::assertChar('\t', *input);
DB::readIntText(read_type, *input);
/** Then there can be a newline (old version)
* or tab, the region's population, line feed (new version).
*/
RegionPopulation population = 0;
if (!input->eof() && *input->position() == '\t')
{
++input->position();
UInt64 population_big = 0;
DB::readIntText(population_big, *input);
population = population_big > std::numeric_limits<RegionPopulation>::max() ? std::numeric_limits<RegionPopulation>::max()
: static_cast<RegionPopulation>(population_big);
}
DB::assertChar('\n', *input);
if (read_region_id <= 0 || read_type < 0)
continue;
RegionID region_id = read_region_id;
RegionID parent_id = 0;
if (read_parent_id >= 0)
parent_id = read_parent_id;
RegionType type = static_cast<RegionType>(read_type);
entry.id = region_id;
entry.parent_id = parent_id;
entry.type = type;
entry.population = population;
return true;
}
return false;
}
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