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#pragma once
#include "indexer/cell_id.hpp"
#include "indexer/feature_covering.hpp"
#include "indexer/interval_index.hpp"
#include "indexer/locality_object.hpp"
#include "indexer/scales.hpp"
#include "coding/file_container.hpp"
#include "geometry/rect2d.hpp"
#include "base/geo_object_id.hpp"
#include <cstdint>
#include <functional>
#include <memory>
#include <set>
#include <string>
#include "defines.hpp"
namespace indexer
{
// Geometry index which stores base::GeoObjectId as object identifier.
// Used for geocoder server, stores only POIs and buildings which have address information.
// Based on IntervalIndex.
template <typename Reader, int DEPTH_LEVELS>
class LocalityIndex
{
public:
using ProcessObject = std::function<void(base::GeoObjectId const &)>;
LocalityIndex() = default;
explicit LocalityIndex(Reader const & reader)
{
m_intervalIndex = std::make_unique<IntervalIndex<Reader, uint64_t>>(reader);
}
void ForEachInRect(ProcessObject const & processObject, m2::RectD const & rect) const
{
covering::CoveringGetter cov(rect, covering::CoveringMode::ViewportWithLowLevels);
covering::Intervals const & intervals = cov.Get<DEPTH_LEVELS>(scales::GetUpperScale());
for (auto const & i : intervals)
{
m_intervalIndex->ForEach(
[&processObject](uint64_t storedId) {
processObject(LocalityObject::FromStoredId(storedId));
},
i.first, i.second);
}
}
// Applies |processObject| to the objects located within |radiusM| meters from |center|.
// Application to the closest objects and only to them is not guaranteed and the order
// of the objects is not specified.
// However, the method attempts to process objects that are closer to |center| first
// and stop after |sizeHint| objects have been processed. For stability, if an object from
// an index cell has been processed, all other objects from this cell will be processed too,
// thus probably overflowing the |sizeHint| limit.
void ForClosestToPoint(ProcessObject const & processObject, m2::PointD const & center,
double radiusM, uint32_t sizeHint) const
{
auto const rect =
MercatorBounds::RectByCenterXYAndSizeInMeters(center, radiusM);
covering::CoveringGetter cov(rect, covering::CoveringMode::Spiral);
covering::Intervals const & intervals = cov.Get<DEPTH_LEVELS>(scales::GetUpperScale());
std::set<uint64_t> objects;
auto processAll = [&objects, &processObject](uint64_t storedId) {
if (objects.insert(storedId).second)
processObject(LocalityObject::FromStoredId(storedId));
};
auto process = [&](uint64_t storedId) {
if (objects.size() < sizeHint)
processAll(storedId);
};
CHECK_EQUAL(intervals.begin()->first, intervals.begin()->second - 1, ());
auto cellDepth = covering::GetCodingDepth<DEPTH_LEVELS>(scales::GetUpperScale());
auto bestCell = m2::CellId<DEPTH_LEVELS>::FromInt64(intervals.begin()->first, cellDepth);
std::set<int64_t> bestCells;
while (bestCell.Level() > 0)
{
bestCells.insert(bestCell.ToInt64(cellDepth));
bestCell = bestCell.Parent();
}
for (auto const & i : intervals)
{
if (bestCells.find(i.first) != bestCells.end())
{
m_intervalIndex->ForEach(processAll, i.first, i.second);
}
else
{
m_intervalIndex->ForEach(process, i.first, i.second);
if (objects.size() >= sizeHint)
return;
}
}
}
private:
std::unique_ptr<IntervalIndex<Reader, uint64_t>> m_intervalIndex;
};
template <typename Reader>
using GeoObjectsIndex = LocalityIndex<Reader, kGeoObjectsDepthLevels>;
template <typename Reader>
using RegionsIndex = LocalityIndex<Reader, kRegionsDepthLevels>;
template <typename Reader>
struct GeoObjectsIndexBox
{
static constexpr const char * kFileTag = GEO_OBJECTS_INDEX_FILE_TAG;
using ReaderType = Reader;
using IndexType = GeoObjectsIndex<ReaderType>;
};
template <typename Reader>
struct RegionsIndexBox
{
static constexpr const char * kFileTag = REGIONS_INDEX_FILE_TAG;
using ReaderType = Reader;
using IndexType = RegionsIndex<ReaderType>;
};
template <typename IndexBox, typename Reader>
typename IndexBox::IndexType ReadIndex(std::string const & pathIndx)
{
FilesContainerR cont(pathIndx);
auto const offsetSize = cont.GetAbsoluteOffsetAndSize(IndexBox::kFileTag);
Reader reader(pathIndx);
typename IndexBox::ReaderType subReader(reader.CreateSubReader(offsetSize.first, offsetSize.second));
typename IndexBox::IndexType index(subReader);
return index;
}
} // namespace indexer
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