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#include "generator/metalines_builder.hpp"
#include "generator/routing_helpers.hpp"
#include "indexer/classificator.hpp"
#include "coding/file_container.hpp"
#include "coding/varint.hpp"
#include "coding/write_to_sink.hpp"
#include "base/checked_cast.hpp"
#include "base/logging.hpp"
#include "base/string_utils.hpp"
#include "defines.hpp"
#include <cstdint>
#include <map>
namespace
{
uint8_t const kMetaLinesSectionVersion = 1;
using Ways = std::vector<int32_t>;
/// A string of connected ways.
class LineString
{
Ways m_ways;
uint64_t m_start;
uint64_t m_end;
bool m_oneway;
public:
explicit LineString(OsmElement const & way)
{
std::string const oneway = way.GetTag("oneway");
m_oneway = !oneway.empty() && oneway != "no";
int32_t const wayId = base::checked_cast<int32_t>(way.m_id);
m_ways.push_back(oneway == "-1" ? -wayId : wayId);
CHECK_GREATER_OR_EQUAL(way.Nodes().size(), 2, ());
m_start = way.Nodes().front();
m_end = way.Nodes().back();
}
Ways const & GetWays() const { return m_ways; }
void Reverse()
{
ASSERT(!m_oneway, ("Trying to reverse a one-way road."));
std::swap(m_start, m_end);
std::reverse(m_ways.begin(), m_ways.end());
for (auto & p : m_ways)
p = -p;
}
bool Add(LineString & line)
{
if (m_start == line.m_start || m_end == line.m_end)
{
if (!line.m_oneway)
line.Reverse();
else if (!m_oneway)
Reverse();
else
return false;
}
if (m_end == line.m_start)
{
m_ways.insert(m_ways.end(), line.m_ways.begin(), line.m_ways.end());
m_end = line.m_end;
m_oneway = m_oneway || line.m_oneway;
}
else if (m_start == line.m_end)
{
m_ways.insert(m_ways.begin(), line.m_ways.begin(), line.m_ways.end());
m_start = line.m_start;
m_oneway = m_oneway || line.m_oneway;
}
else
{
return false;
}
return true;
}
};
} // namespace
namespace feature
{
/// A list of segments, that is, LineStrings, sharing the same attributes.
class Segments
{
std::list<LineString> m_parts;
public:
explicit Segments(OsmElement const & way) { m_parts.emplace_back(way); }
void Add(OsmElement const & way)
{
LineString line(way);
auto found = m_parts.end();
for (auto i = m_parts.begin(); i != m_parts.end(); ++i)
{
if (i->Add(line))
{
found = i;
break;
}
}
// If no LineString accepted the way in its Add method, create a new LineString with it.
if (found == m_parts.cend())
{
m_parts.push_back(line);
return;
}
// Otherwise check if the extended LineString can be merged with some other LineString.
for (LineString & part : m_parts)
{
if (part.Add(*found))
{
m_parts.erase(found);
break;
}
}
}
std::vector<Ways> GetLongWays() const
{
std::vector<Ways> result;
for (LineString const & line : m_parts)
{
if (line.GetWays().size() > 1)
{
result.push_back(line.GetWays());
}
}
return result;
}
};
// MetalinesBuilder --------------------------------------------------------------------------------
void MetalinesBuilder::CollectFeature(FeatureBuilder const & feature, OsmElement const & element)
{
if (!feature.IsLine())
return;
auto const & params = feature.GetParams();
static uint32_t const highwayType = classif().GetTypeByPath({"highway"});
if (params.FindType(highwayType, 1) == ftype::GetEmptyValue() ||
element.Nodes().front() == element.Nodes().back())
{
return;
}
std::string name;
params.name.GetString(StringUtf8Multilang::kDefaultCode, name);
if (name.empty() && params.ref.empty())
return;
size_t const key = std::hash<std::string>{}(name + '\0' + params.ref);
auto segment = m_data.find(key);
if (segment == m_data.cend())
m_data.emplace(key, std::make_shared<Segments>(element));
else
segment->second->Add(element);
}
void MetalinesBuilder::Save()
{
Flush();
}
void MetalinesBuilder::Flush()
{
try
{
uint32_t count = 0;
FileWriter writer(m_filePath);
for (auto const & seg : m_data)
{
auto const & longWays = seg.second->GetLongWays();
for (Ways const & ways : longWays)
{
uint16_t size = base::checked_cast<uint16_t>(ways.size());
WriteToSink(writer, size);
for (int32_t const way : ways)
WriteToSink(writer, way);
++count;
}
}
LOG_SHORT(LINFO, ("Wrote", count, "metalines with OSM IDs for the entire planet to", m_filePath));
}
catch (RootException const & e)
{
LOG(LERROR, ("An exception happened while saving metalines to", m_filePath, ":", e.what()));
}
}
// Functions --------------------------------------------------------------------------------
bool WriteMetalinesSection(std::string const & mwmPath, std::string const & metalinesPath,
std::string const & osmIdsToFeatureIdsPath)
{
std::map<base::GeoObjectId, uint32_t> osmIdToFeatureId;
if (!routing::ParseRoadsOsmIdToFeatureIdMapping(osmIdsToFeatureIdsPath, osmIdToFeatureId))
return false;
FileReader reader(metalinesPath);
ReaderSource<FileReader> src(reader);
std::vector<uint8_t> buffer;
MemWriter<std::vector<uint8_t>> memWriter(buffer);
uint32_t count = 0;
while (src.Size() > 0)
{
std::vector<int32_t> featureIds;
uint16_t size = ReadPrimitiveFromSource<uint16_t>(src);
std::vector<int32_t> ways(size);
src.Read(ways.data(), size * sizeof(int32_t));
for (auto const wayId : ways)
{
// We get a negative wayId when a feature direction should be reversed.
auto fid = osmIdToFeatureId.find(base::MakeOsmWay(std::abs(wayId)));
if (fid == osmIdToFeatureId.cend())
break;
// Keeping the sign for the feature direction.
int32_t const featureId = static_cast<int32_t>(fid->second);
featureIds.push_back(wayId > 0 ? featureId : -featureId);
}
if (featureIds.size() > 1)
{
// Write vector to buffer if we have got at least two segments.
WriteVarUint(memWriter, featureIds.size());
for (auto const & fid : featureIds)
WriteVarInt(memWriter, fid);
++count;
}
}
// Write buffer to section.
FilesContainerW cont(mwmPath, FileWriter::OP_WRITE_EXISTING);
FileWriter writer = cont.GetWriter(METALINES_FILE_TAG);
WriteToSink(writer, kMetaLinesSectionVersion);
WriteVarUint(writer, count);
writer.Write(buffer.data(), buffer.size());
LOG(LINFO, ("Finished writing metalines section, found", count, "metalines."));
return true;
}
} // namespace feature
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