222 lines
7.7 KiB
C++
222 lines
7.7 KiB
C++
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#ifndef OSMIUM_IO_DETAIL_INPUT_FORMAT_HPP
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#define OSMIUM_IO_DETAIL_INPUT_FORMAT_HPP
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/*
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This file is part of Osmium (http://osmcode.org/libosmium).
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Copyright 2013-2017 Jochen Topf <jochen@topf.org> and others (see README).
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#include <exception>
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#include <functional>
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#include <future>
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#include <map>
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#include <memory>
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#include <string>
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#include <utility>
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#include <osmium/io/detail/queue_util.hpp>
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#include <osmium/io/error.hpp>
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#include <osmium/io/file.hpp>
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#include <osmium/io/file_format.hpp>
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#include <osmium/io/header.hpp>
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#include <osmium/memory/buffer.hpp>
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#include <osmium/osm/entity_bits.hpp>
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#include <osmium/thread/pool.hpp>
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namespace osmium {
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namespace io {
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namespace detail {
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struct parser_arguments {
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osmium::thread::Pool& pool;
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future_string_queue_type& input_queue;
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future_buffer_queue_type& output_queue;
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std::promise<osmium::io::Header>& header_promise;
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osmium::osm_entity_bits::type read_which_entities;
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osmium::io::read_meta read_metadata;
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};
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class Parser {
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osmium::thread::Pool& m_pool;
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future_buffer_queue_type& m_output_queue;
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std::promise<osmium::io::Header>& m_header_promise;
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queue_wrapper<std::string> m_input_queue;
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osmium::osm_entity_bits::type m_read_which_entities;
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osmium::io::read_meta m_read_metadata;
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bool m_header_is_done;
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protected:
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osmium::thread::Pool& get_pool() {
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return m_pool;
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}
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osmium::osm_entity_bits::type read_types() const noexcept {
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return m_read_which_entities;
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}
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osmium::io::read_meta read_metadata() const noexcept {
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return m_read_metadata;
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}
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bool header_is_done() const noexcept {
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return m_header_is_done;
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}
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void set_header_value(const osmium::io::Header& header) {
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if (!m_header_is_done) {
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m_header_is_done = true;
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m_header_promise.set_value(header);
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}
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}
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void set_header_exception(const std::exception_ptr& exception) {
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if (!m_header_is_done) {
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m_header_is_done = true;
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m_header_promise.set_exception(exception);
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}
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}
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/**
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* Wrap the buffer into a future and add it to the output queue.
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*/
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void send_to_output_queue(osmium::memory::Buffer&& buffer) {
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add_to_queue(m_output_queue, std::move(buffer));
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}
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void send_to_output_queue(std::future<osmium::memory::Buffer>&& future) {
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m_output_queue.push(std::move(future));
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}
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public:
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explicit Parser(parser_arguments& args) :
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m_pool(args.pool),
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m_output_queue(args.output_queue),
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m_header_promise(args.header_promise),
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m_input_queue(args.input_queue),
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m_read_which_entities(args.read_which_entities),
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m_read_metadata(args.read_metadata),
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m_header_is_done(false) {
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}
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Parser(const Parser&) = delete;
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Parser& operator=(const Parser&) = delete;
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Parser(Parser&&) = delete;
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Parser& operator=(Parser&&) = delete;
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virtual ~Parser() noexcept = default;
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virtual void run() = 0;
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std::string get_input() {
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return m_input_queue.pop();
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}
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bool input_done() const {
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return m_input_queue.has_reached_end_of_data();
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}
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void parse() {
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try {
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run();
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} catch (...) {
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std::exception_ptr exception = std::current_exception();
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set_header_exception(exception);
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add_to_queue(m_output_queue, std::move(exception));
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}
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add_end_of_data_to_queue(m_output_queue);
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}
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}; // class Parser
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/**
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* This factory class is used to create objects that decode OSM
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* data written in a specified format.
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*
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* Do not use this class directly. Use the osmium::io::Reader
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* class instead.
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*/
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class ParserFactory {
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public:
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using create_parser_type = std::function<std::unique_ptr<Parser>(parser_arguments&)>;
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private:
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using map_type = std::map<osmium::io::file_format, create_parser_type>;
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map_type m_callbacks;
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ParserFactory() :
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m_callbacks() {
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}
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public:
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static ParserFactory& instance() {
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static ParserFactory factory;
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return factory;
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}
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bool register_parser(osmium::io::file_format format, create_parser_type&& create_function) {
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const auto result = m_callbacks.emplace(format, std::forward<create_parser_type>(create_function));
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return result.second;
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}
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create_parser_type get_creator_function(const osmium::io::File& file) const {
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const auto it = m_callbacks.find(file.format());
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if (it == m_callbacks.end()) {
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throw unsupported_file_format_error{
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std::string{"Can not open file '"} +
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file.filename() +
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"' with type '" +
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as_string(file.format()) +
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"'. No support for reading this format in this program."};
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}
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return it->second;
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}
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}; // class ParserFactory
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} // namespace detail
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} // namespace io
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} // namespace osmium
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#endif // OSMIUM_IO_DETAIL_INPUT_FORMAT_HPP
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