101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/*
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EXAMPLE osmium_create_pois
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Showing how to create nodes for points of interest out of thin air.
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DEMONSTRATES USE OF:
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* file output
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* Osmium buffers
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* using builders to write data
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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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* osmium_pub_names
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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 <cstdlib> // for std::exit
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#include <cstring> // for std::strcmp
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#include <ctime> // for std::time
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#include <exception> // for std::exception
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#include <iostream> // for std::cout, std::cerr
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#include <string> // for std::string
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#include <utility> // for std::move
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// Allow any format of output files (XML, PBF, ...)
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#include <osmium/io/any_output.hpp>
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// We want to use the builder interface
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#include <osmium/builder/osm_object_builder.hpp>
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#include <osmium/builder/attr.hpp>
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// Declare this to use the functions starting with the underscore (_) below.
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using namespace osmium::builder::attr;
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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] << " OUTFILE\n";
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std::exit(1);
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}
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// Get output file name from command line.
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std::string output_file_name{argv[1]};
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// If output file name is "-", this means STDOUT. Set the OPL file type
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// in this case. Otherwise take the file type from the file name suffix.
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osmium::io::File output_file{output_file_name, output_file_name == "-" ? ".opl" : ""};
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try {
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// Create a buffer where all objects will live. Use a sensible initial
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// buffer size and set the buffer to automatically grow if needed.
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const size_t initial_buffer_size = 10000;
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osmium::memory::Buffer buffer{initial_buffer_size, osmium::memory::Buffer::auto_grow::yes};
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// Add nodes to the buffer. This is, of course, only an example.
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// You can set any of the attributes and more tags, etc. Ways and
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// relations can be added in a similar way.
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osmium::builder::add_node(buffer,
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_id(-1),
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_version(1),
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_timestamp(std::time(nullptr)),
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_location(osmium::Location{1.23, 3.45}),
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_tag("amenity", "post_box")
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);
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osmium::builder::add_node(buffer,
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_id(-2),
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_version(1),
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_timestamp(std::time(nullptr)),
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_location(1.24, 3.46),
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_tags({{"amenity", "restaurant"},
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{"name", "Chez OSM"}})
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);
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// Create header and set generator.
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osmium::io::Header header;
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header.set("generator", "osmium_create_pois");
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// Initialize Writer using the header from above and tell it that it
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// is allowed to overwrite a possibly existing file.
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osmium::io::Writer writer{output_file, header, osmium::io::overwrite::allow};
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// Write out the contents of the output buffer.
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writer(std::move(buffer));
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// Explicitly close the writer. Will throw an exception if there is
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// a problem. If you wait for the destructor to close the writer, you
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// will not notice the problem, because destructors must not throw.
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writer.close();
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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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std::exit(1);
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}
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}
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