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multipolygon_collector.hpp
Go to the documentation of this file.
#ifndef OSMIUM_AREA_MULTIPOLYGON_COLLECTOR_HPP
#define OSMIUM_AREA_MULTIPOLYGON_COLLECTOR_HPP
/*
This file is part of Osmium (https://osmcode.org/libosmium).
Copyright 2013-2026 Jochen Topf <jochen@topf.org> and others (see README).
Boost Software License - Version 1.0 - August 17th, 2003
Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:
The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include <osmium/area/stats.hpp>
#include <osmium/memory/buffer.hpp>
#include <osmium/osm/item_type.hpp>
#include <osmium/osm/location.hpp>
#include <osmium/osm/node_ref.hpp>
#include <osmium/osm/relation.hpp>
#include <osmium/osm/tag.hpp>
#include <osmium/osm/way.hpp>
#include <osmium/relations/collector.hpp>
#include <algorithm>
#include <cstddef>
#include <cstring>
#include <vector>
namespace osmium {
namespace relations {
class RelationMeta;
} // namespace relations
namespace area {
template <typename TAssembler>
class MultipolygonCollector : public osmium::relations::Collector<MultipolygonCollector<TAssembler>, false, true, false> {
using collector_type = osmium::relations::Collector<MultipolygonCollector<TAssembler>, false, true, false>;
using assembler_config_type = typename TAssembler::config_type;
assembler_config_type m_assembler_config;
osmium::memory::Buffer m_output_buffer;
area_stats m_stats;
enum {
initial_output_buffer_size = 1024UL * 1024UL
};
enum {
max_buffer_size_for_flush = 100UL * 1024UL
};
void flush_output_buffer() {
if (this->callback()) {
osmium::memory::Buffer buffer{initial_output_buffer_size};
using std::swap;
swap(buffer, m_output_buffer);
this->callback()(std::move(buffer));
}
}
void possibly_flush_output_buffer() {
if (m_output_buffer.committed() > max_buffer_size_for_flush) {
flush_output_buffer();
}
}
public:
explicit MultipolygonCollector(const assembler_config_type& assembler_config) :
collector_type(),
m_assembler_config(assembler_config),
m_output_buffer(initial_output_buffer_size, osmium::memory::Buffer::auto_grow::yes) {
}
const area_stats& stats() const noexcept {
return m_stats;
}
bool keep_relation(const osmium::Relation& relation) const {
const char* type = relation.tags().get_value_by_key("type");
// ignore relations without "type" tag
if (!type) {
return false;
}
return (!std::strcmp(type, "multipolygon")) || (!std::strcmp(type, "boundary"));
}
bool keep_member(const osmium::relations::RelationMeta& /*relation_meta*/, const osmium::RelationMember& member) const {
// We are only interested in members of type way.
return member.type() == osmium::item_type::way;
}
void way_not_in_any_relation(const osmium::Way& way) {
// you need at least 4 nodes to make up a polygon
if (way.nodes().size() <= 3) {
return;
}
try {
if (!way.nodes().front().location() || !way.nodes().back().location()) {
throw osmium::invalid_location{"invalid location"};
}
if (way.ends_have_same_location()) {
// way is closed and has enough nodes, build simple multipolygon
TAssembler assembler{m_assembler_config};
assembler(way, m_output_buffer);
m_stats += assembler.stats();
possibly_flush_output_buffer();
}
} catch (const osmium::invalid_location&) {
// XXX ignore
}
}
void complete_relation(const osmium::relations::RelationMeta& relation_meta) {
const osmium::Relation& relation = this->get_relation(relation_meta);
const osmium::memory::Buffer& buffer = this->members_buffer();
std::vector<const osmium::Way*> ways;
ways.reserve(relation.members().size());
for (const auto& member : relation.members()) {
if (member.ref() != 0) {
const size_t offset = this->get_offset(member.type(), member.ref());
ways.push_back(&buffer.get<const osmium::Way>(offset));
}
}
try {
TAssembler assembler{m_assembler_config};
assembler(relation, ways, m_output_buffer);
m_stats += assembler.stats();
possibly_flush_output_buffer();
} catch (const osmium::invalid_location&) {
// XXX ignore
}
}
void flush() {
flush_output_buffer();
}
osmium::memory::Buffer read() {
osmium::memory::Buffer buffer{initial_output_buffer_size, osmium::memory::Buffer::auto_grow::yes};
using std::swap;
swap(buffer, m_output_buffer);
return buffer;
}
}; // class MultipolygonCollector
} // namespace area
} // namespace osmium
#endif // OSMIUM_AREA_MULTIPOLYGON_COLLECTOR_HPP
buffer.hpp
osmium::RelationMember
Definition relation.hpp:56
osmium::RelationMember::type
item_type type() const noexcept
Definition relation.hpp:125
osmium::Relation
Definition relation.hpp:161
osmium::Way
Definition way.hpp:72
osmium::area::MultipolygonCollector::keep_member
bool keep_member(const osmium::relations::RelationMeta &, const osmium::RelationMember &member) const
Definition multipolygon_collector.hpp:143
osmium::area::MultipolygonCollector::max_buffer_size_for_flush
@ max_buffer_size_for_flush
Definition multipolygon_collector.hpp:93
osmium::area::MultipolygonCollector::read
osmium::memory::Buffer read()
Definition multipolygon_collector.hpp:202
osmium::area::MultipolygonCollector::keep_relation
bool keep_relation(const osmium::Relation &relation) const
Definition multipolygon_collector.hpp:129
osmium::area::MultipolygonCollector::stats
const area_stats & stats() const noexcept
Definition multipolygon_collector.hpp:119
osmium::area::MultipolygonCollector::initial_output_buffer_size
@ initial_output_buffer_size
Definition multipolygon_collector.hpp:89
osmium::area::MultipolygonCollector::possibly_flush_output_buffer
void possibly_flush_output_buffer()
Definition multipolygon_collector.hpp:105
osmium::area::MultipolygonCollector::complete_relation
void complete_relation(const osmium::relations::RelationMeta &relation_meta)
Definition multipolygon_collector.hpp:175
osmium::area::MultipolygonCollector::assembler_config_type
typename TAssembler::config_type assembler_config_type
Definition multipolygon_collector.hpp:81
osmium::area::MultipolygonCollector::flush_output_buffer
void flush_output_buffer()
Definition multipolygon_collector.hpp:96
osmium::area::MultipolygonCollector::MultipolygonCollector
MultipolygonCollector(const assembler_config_type &assembler_config)
Definition multipolygon_collector.hpp:113
osmium::area::MultipolygonCollector::m_assembler_config
assembler_config_type m_assembler_config
Definition multipolygon_collector.hpp:82
osmium::area::MultipolygonCollector::m_stats
area_stats m_stats
Definition multipolygon_collector.hpp:86
osmium::area::MultipolygonCollector::collector_type
osmium::relations::Collector< MultipolygonCollector< TAssembler >, false, true, false > collector_type
Definition multipolygon_collector.hpp:79
osmium::area::MultipolygonCollector::way_not_in_any_relation
void way_not_in_any_relation(const osmium::Way &way)
Definition multipolygon_collector.hpp:154
osmium::area::MultipolygonCollector::flush
void flush()
Definition multipolygon_collector.hpp:198
osmium::area::MultipolygonCollector::m_output_buffer
osmium::memory::Buffer m_output_buffer
Definition multipolygon_collector.hpp:84
osmium::relations::Collector
Definition collector.hpp:98
osmium::relations::Collector< MultipolygonCollector< TAssembler >, false, true, false >::members_buffer
osmium::memory::Buffer & members_buffer()
Definition collector.hpp:484
osmium::relations::Collector< MultipolygonCollector< TAssembler >, false, true, false >::get_relation
const osmium::Relation & get_relation(size_t offset) const
Definition collector.hpp:301
osmium::relations::Collector< MultipolygonCollector< TAssembler >, false, true, false >::get_offset
size_t get_offset(osmium::item_type type, osmium::object_id_type id)
Definition collector.hpp:514
osmium::relations::Collector< MultipolygonCollector< TAssembler >, false, true, false >::callback
callback_func_type callback()
Definition collector.hpp:222
collector.hpp
item_type.hpp
location.hpp
osmium::area
Code related to the building of areas (multipolygons) from relations.
Definition assembler.hpp:55
osmium::memory
Definition osm_object_builder.hpp:66
osmium::relations
Code related to the assembly of OSM relations.
Definition multipolygon_collector.hpp:53
osmium
Namespace for everything in the Osmium library.
Definition assembler.hpp:53
osmium::item_type::relation
@ relation
Definition item_type.hpp:50
osmium::item_type::way
@ way
Definition item_type.hpp:49
node_ref.hpp
relation.hpp
stats.hpp
osmium::area::area_stats
Definition stats.hpp:49
osmium::invalid_location
Definition location.hpp:54
tag.hpp
way.hpp