5266ac1635
Currently OSRM only supports turn restrictions with a single via-node or one via-way. OSM allows for multiple via-ways to represent longer and more complex restrictions. This PR extends the use of duplicate nodes for representng via-way turn restrictions to also support multi via-way restrictions. Effectively, this increases the edge-based graph size by the number of edges in multi via-way restrictions. However, given the low number of these restrictions it has little effect on total graph size. In addition, we add a new step in the extraction phase that constructs a restriction graph to support more complex relationships between restrictions, such as nested restrictions and overlapping restrictions.
57 lines
2.3 KiB
C++
57 lines
2.3 KiB
C++
#ifndef OSRM_EXTRACTOR_RESTRICTION_COMPRESSOR_HPP_
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#define OSRM_EXTRACTOR_RESTRICTION_COMPRESSOR_HPP_
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#include "extractor/maneuver_override.hpp"
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#include "extractor/restriction.hpp"
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#include "util/typedefs.hpp"
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#include <boost/unordered_map.hpp>
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#include <vector>
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namespace osrm
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{
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namespace extractor
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{
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struct NodeRestriction;
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struct TurnRestriction;
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// OSRM stores restrictions as node -> [node] -> node instead of way -> node -> way (or
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// way->[way]->way) as it is done in OSM. These restrictions need to match the state of graph
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// compression which we perform in the graph compressor that removes certain degree two nodes from
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// the graph (all but the ones with penalties/barriers, as of the state of writing).
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// Since this graph compression ins performed after creating the restrictions in the extraction
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// phase, we need to update the involved nodes whenever one of the nodes is compressed.
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//
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//
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// !!!! Will bind to the restrictions vector and modify it in-place !!!!
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class RestrictionCompressor
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{
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public:
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RestrictionCompressor(std::vector<TurnRestriction> &restrictions,
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std::vector<UnresolvedManeuverOverride> &maneuver_overrides);
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// account for the compression of `from-via-to` into `from-to`
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void Compress(const NodeID from, const NodeID via, const NodeID to);
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private:
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// A turn restriction is given as `from star via node to end`. Edges ending at `head` being
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// contracted move the head pointer to their respective head. Edges starting at tail move the
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// tail values to their respective tails.
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// Via nodes that are compressed are removed from the restriction representation.
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// We do not compress the first and last via nodes of a restriction as they act as
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// entrance/exit points into the restriction graph. For a node restriction, the first and last
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// via nodes are the same.
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boost::unordered_multimap<NodeID, TurnRestriction *> starts;
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boost::unordered_multimap<NodeID, TurnRestriction *> vias;
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boost::unordered_multimap<NodeID, TurnRestriction *> ends;
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boost::unordered_multimap<NodeID, NodeBasedTurn *> maneuver_starts;
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boost::unordered_multimap<NodeID, NodeBasedTurn *> maneuver_ends;
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};
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} // namespace extractor
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} // namespace osrm
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#endif // OSRM_EXTRACTOR_RESTRICTION_COMPRESSOR_HPP_
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