C++ Relation::members方法代码示例

                void relation(const osmium::Relation& relation) {
                    if (m_write_change_ops) {
                        open_close_op_tag(relation.visible() ? (relation.version() == 1 ? operation::op_create : operation::op_modify) : operation::op_delete);
                    }

                    write_prefix();
                    m_out += "<relation";
                    write_meta(relation);

                    if (relation.tags().empty() && relation.members().empty()) {
                        m_out += "/>\n";
                        return;
                    }

                    m_out += ">\n";

                    for (const auto& member : relation.members()) {
                        write_prefix();
                        m_out += "  <member type=\"";
                        m_out += item_type_to_name(member.type());
                        oprintf(m_out, "\" ref=\"%" PRId64 "\" role=\"", member.ref());
                        xml_string(m_out, member.role());
                        m_out += "\"/>\n";
                    }

                    write_tags(relation.tags());

                    write_prefix();
                    m_out += "</relation>\n";
                }

	void relation( osmium::Relation& relation ) {
		const char* bus = relation.tags()["route"];
		if(bus && !strcmp(bus, "bus")) {
			const char* name = relation.tags().get_value_by_key("ref");
			if(!name) name = relation.tags().get_value_by_key("name");
			
			std::cout << name;
			
			osmium::unsigned_object_id_type temp1, temp2;
			int db = 0;
			for( auto &member : relation.members()){
				if(db == 0 && member.type() == osmium::item_type::node) {
					temp1 = member.positive_ref();
					db++;
				} else if(db !=0 && member.type() == osmium::item_type::node){
					temp2 = member.positive_ref();
				}				
			}
			
			std::cout << " (" << map[temp1] << " - " << map[temp2] << ")" << std::endl;
			
			for ( auto &member : relation.members()) {
				if( member.type() == osmium::item_type::node){
					std::cout << " " << locations.get(member.positive_ref()).lat() << ", " << locations.get(member.positive_ref()).lon() << " " << map[member.positive_ref()] << std::endl;
				}
				
			}
			std::cout << std::endl;
		}
	}

osmium::osm_entity_bits::type CommandAddRefs::add_members(const osmium::Relation& relation) {
    osmium::osm_entity_bits::type read_types = osmium::osm_entity_bits::nothing;

    for (const auto& member : relation.members()) {
        switch (member.type()) {
            case osmium::item_type::node:
                m_node_ids.insert(member.ref());
                break;
            case osmium::item_type::way:
                if (m_way_ids.count(member.ref()) == 0) {
                    m_way_ids.insert(member.ref());
                    read_types |= osmium::osm_entity_bits::way;
                }
                break;
            case osmium::item_type::relation:
                if (m_relation_ids.count(member.ref()) == 0) {
                    m_relation_ids.insert(member.ref());
                    read_types |= osmium::osm_entity_bits::relation;
                }
                break;
            default:
                break;
        }
    }

    return read_types;
}

            /**
             * We are interested in all relations tagged with type=multipolygon
             * or type=boundary with at least one way member.
             */
            bool new_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;
                }

                if ((!std::strcmp(type, "multipolygon")) || (!std::strcmp(type, "boundary"))) {
                    return std::any_of(relation.members().cbegin(), relation.members().cend(), [](const RelationMember& member) {
                        return member.type() == osmium::item_type::way;
                    });
                }

                return false;
            }

    void relation(osmium::Relation& rel) {
        const char* bus = rel.tags() ["route"];
        if (bus && !strcmp(bus, "bus")) {
            const char* busRef = rel.tags()["ref"];
            if (busRef) {
                buses.push_back(Bus(busRef, id));
                id++;

                osmium::RelationMemberList& rml = rel.members();
                for (osmium::RelationMember& rm : rml) {
                    if (rm.type() == osmium::item_type::way) {
                        std::vector<osmium::Location> tmpVec;
                        for (auto& nd : ways[rm.ref()]) {
                            osmium::Location loc = locations.get(nd);
                            tmpVec.push_back(loc);
                        }
                        buses.at(id - 1).locs.push_back(tmpVec);
                    } else if(rm.type() == osmium::item_type::node && 
                                !strcmp(rm.role(), "stop")) {
                        buses.at(id - 1).busStopNames[rm.ref()] = nodes[rm.ref()];
                    }
                }
            }
        }
    }

    // - walk over all relations-versions
    //   - walk over all relations-nodes
    //     - Adds the nodes and ways that aren't in node-tracker to a vector
    //     - if node or way is in the box hit becames true
    //   - if hit is true and the vector is not empty (it means their are nodes or ways that belong to a relation that has at least one node or way inside the box)
    //     - Records the id of node or way to outside_node_tracker or outside_way_tracker
    void relation(const osmium::Relation& relation) {
	
    	bool hit = false;

        if (debug) {
            std::cerr << "cut_administrative relation " << relation.id() << " v" << relation.version() << "\n";
        }
    	
        std::vector<const osmium::RelationMember*> members;
        std::vector<const osmium::TagList*> tags;

        for (auto& tag : relation.tags()) {
            if (strcmp(tag.key(), "boundary") == 0 && strcmp(tag.value(), "administrative") == 0)
                hit = true;
        }

    	for (const auto& extract : info->extracts) {
            if (hit){
                if(!extract->relation_tracker.get(relation.id())){
                    extract->relation_tracker.set(relation.id());
                }
                //Add only the nodes and ways that were not yet in the respective trackers if hit is true
                for (const auto& member : relation.members()) {
                    if (member.type() == osmium::item_type::way && !extract->way_tracker.get(member.ref())){
                            extract->way_tracker.set(member.ref());
                    } 
                }
            }
        }
    }

 /**
  * Extract all segments from all ways that make up this
  * multipolygon relation and add them to the list.
  */
 void extract_segments_from_ways(const osmium::Relation& relation, const std::vector<size_t>& members, const osmium::memory::Buffer& in_buffer) {
     auto member_it = relation.members().begin();
     for (size_t offset : members) {
         const osmium::Way& way = in_buffer.get<const osmium::Way>(offset);
         extract_segments_from_way(way, member_it->role());
         ++member_it;
     }
 }

                void relation(const osmium::Relation& relation) {
                    *m_out += 'r';
                    write_meta(relation);

                    *m_out += " M";

                    if (!relation.members().empty()) {
                        auto it = relation.members().begin();
                        relation_member(*it);
                        for (++it; it != relation.members().end(); ++it) {
                            *m_out += ',';
                            relation_member(*it);
                        }
                    }

                    *m_out += '\n';
                }

            /**
             * This is called when a relation is complete, ie. all members
             * were found in the input. It will build the area using the
             * assembler.
             */
            void complete_relation(const osmium::Relation& relation) {
                std::vector<const osmium::Way*> ways;
                ways.reserve(relation.members().size());
                for (const auto& member : relation.members()) {
                    if (member.ref() != 0) {
                        ways.push_back(this->get_member_way(member.ref()));
                        assert(ways.back() != nullptr);
                    }
                }

                try {
                    TAssembler assembler{m_assembler_config};
                    assembler(relation, ways, this->buffer());
                    m_stats += assembler.stats();
                } catch (const osmium::invalid_location&) {
                    // XXX ignore
                }
            }

 inline void for_each_member(const osmium::Relation& relation, const std::vector<const osmium::Way*>& ways, F&& func) {
     auto way_it = ways.cbegin();
     for (const osmium::RelationMember& member : relation.members()) {
         if (member.type() == osmium::item_type::way) {
             assert(way_it != ways.cend());
             func(member, **way_it);
             ++way_it;
         }
     }
 }

 void complete_relation(const osmium::Relation& relation) noexcept {
     for (const auto& member : relation.members()) {
         if (member.type() == osmium::item_type::node) {
             ++count_nodes;
             const auto* node = get_member_node(member.ref());
             REQUIRE(node);
             buffer().add_item(*node);
             buffer().commit();
         }
     }
 }

    // The relation handler is called for each node in the input data.
    void relation(const osmium::Relation& relation) {
        {
            osmium::builder::RelationBuilder builder{m_buffer};
            copy_attributes(builder, relation);
            copy_tags(builder, relation.tags());

            // Copy the relation member list over to the new way.
            builder.add_item(relation.members());
        }
        m_buffer.commit();
    }

    /***
     * Iterate through members. Create linestrings of each. First as GEOS
     * linestring to union them later. Then as ORG linestring to insert
     * them into table ways.
     */
    void create_ways(const osmium::Relation &relation,
                     const osmium::object_id_type relation_id,
                     bool &contains_nowaterway_ways,
                     vector<geos::geom::Geometry *> *linestrings) {
        
        for (auto& member : relation.members()) {
            if (member_is_valid(member)) {
                const osmium::Way& way = way_from(member);
                linestring_type *linestr = nullptr;
                try {
                    linestr = osmium_geos_factory.create_linestring(way,
                            osmium::geom::use_nodes::unique,
                            osmium::geom::direction::forward).release();
                } catch (osmium::geometry_error) {
                    insert_way_error(way);
                    continue;
                } catch (...) {
                    cerr << "Error at way: " << way.id() << endl;
                    cerr << "  Unexpected error" << endl;
                    continue;
                }
                if (linestr) {
                    linestrings->push_back(linestr);
                } else {
                    continue;
                }

                if (TagCheck::has_waterway_tag(way)) {
                    contains_nowaterway_ways = true;
                }

                OGRGeometry *ogr_linestring = nullptr;
                ogr_linestring = geos2ogr(linestr);

                try {
                    ds.insert_way_feature(ogr_linestring, way, relation_id);
                } catch (osmium::geometry_error&) {
                    cerr << "Inserting to table failed for way: "
                         << way.id() << endl;
                } catch (...) {
                    cerr << "Inserting to table failed for way: "
                         << way.id() << endl;;
                    cerr << "  Unexpected error" << endl;
                }
                OGRGeometryFactory::destroyGeometry(ogr_linestring);
            }
        }
    }

size_t middle_ram_t::rel_way_members_get(osmium::Relation const &rel,
                                         rolelist_t *roles,
                                         osmium::memory::Buffer &buffer) const
{
    size_t count = 0;
    for (auto const &m : rel.members()) {
        if (m.type() == osmium::item_type::way && ways_get(m.ref(), buffer)) {
            if (roles) {
                roles->emplace_back(m.role());
            }
            ++count;
        }
    }

    return count;
}

                /**
                 * Extract all segments from all ways that make up this
                 * multipolygon relation and add them to the list.
                 */
                uint32_t extract_segments_from_ways(osmium::area::ProblemReporter* problem_reporter, const osmium::Relation& relation, const std::vector<const osmium::Way*>& members) {
                    assert(relation.members().size() >= members.size());

                    const size_t num_segments = get_num_segments(members);
                    if (problem_reporter) {
                        problem_reporter->set_nodes(num_segments);
                    }
                    m_segments.reserve(num_segments);

                    uint32_t duplicate_nodes = 0;
                    for_each_member(relation, members, [this, &problem_reporter, &duplicate_nodes](const osmium::RelationMember& member, const osmium::Way& way) {
                        duplicate_nodes += extract_segments_from_way_impl(problem_reporter, way, parse_role(member.role()));
                    });

                    return duplicate_nodes;
                }