99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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EXAMPLE osmium_pub_names
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Show the names and addresses of all pubs found in an OSM file.
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DEMONSTRATES USE OF:
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* file input
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* your own handler
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* access to tags
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SIMPLER EXAMPLES you might want to understand first:
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* osmium_read
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* osmium_count
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LICENSE
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The code in this example file is released into the Public Domain.
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*/
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#include <cstring> // for std::strncmp
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#include <iostream> // for std::cout, std::cerr
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// Allow any format of input files (XML, PBF, ...)
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#include <osmium/io/any_input.hpp>
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// We want to use the handler interface
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#include <osmium/handler.hpp>
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// For osmium::apply()
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#include <osmium/visitor.hpp>
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class NamesHandler : public osmium::handler::Handler {
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static void output_pubs(const osmium::OSMObject& object) {
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const osmium::TagList& tags = object.tags();
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if (tags.has_tag("amenity", "pub")) {
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// Print name of the pub if it is set.
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const char* name = tags["name"];
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if (name) {
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std::cout << name << "\n";
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} else {
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std::cout << "pub with unknown name\n";
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}
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// Iterate over all tags finding those which start with "addr:"
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// and print them.
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for (const osmium::Tag& tag : tags) {
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if (!std::strncmp(tag.key(), "addr:", 5)) {
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std::cout << " " << tag.key() << ": " << tag.value() << "\n";
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}
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}
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}
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}
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public:
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// The callback functions can be either static or not depending on whether
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// you need to access any member variables of the handler.
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// Nodes can be tagged amenity=pub.
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static void node(const osmium::Node& node) {
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output_pubs(node);
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}
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// The callback functions can be either static or not depending on whether
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// you need to access any member variables of the handler.
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// Ways can be tagged amenity=pub, too (typically buildings).
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static void way(const osmium::Way& way) {
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output_pubs(way);
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}
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}; // class NamesHandler
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int main(int argc, char* argv[]) {
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if (argc != 2) {
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std::cerr << "Usage: " << argv[0] << " OSMFILE\n";
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return 1;
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}
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try {
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// Construct the handler defined above
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NamesHandler names_handler;
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// Initialize the reader with the filename from the command line and
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// tell it to only read nodes and ways. We are ignoring multipolygon
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// relations in this simple example.
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osmium::io::Reader reader{argv[1], osmium::osm_entity_bits::node | osmium::osm_entity_bits::way};
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// Apply input data to our own handler
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osmium::apply(reader, names_handler);
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} catch (const std::exception& e) {
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// All exceptions used by the Osmium library derive from std::exception.
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std::cerr << e.what() << '\n';
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return 1;
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}
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}
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