6eb4f090f9
git-subtree-dir: third_party/libosmium git-subtree-split: ce865381fb752323ff1e66181f5a49b7f500ffa3
237 lines
8.6 KiB
C++
237 lines
8.6 KiB
C++
#ifndef OSMIUM_IO_DETAIL_OUTPUT_FORMAT_HPP
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#define OSMIUM_IO_DETAIL_OUTPUT_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 <cstdint>
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#include <functional>
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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/handler.hpp>
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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/memory/buffer.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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class Header;
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} // namespace io
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namespace io {
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namespace detail {
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class OutputBlock : public osmium::handler::Handler {
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protected:
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std::shared_ptr<osmium::memory::Buffer> m_input_buffer;
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std::shared_ptr<std::string> m_out;
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explicit OutputBlock(osmium::memory::Buffer&& buffer) :
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m_input_buffer(std::make_shared<osmium::memory::Buffer>(std::move(buffer))),
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m_out(std::make_shared<std::string>()) {
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}
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// Simple function to convert integer to string. This is much
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// faster than using sprintf, but could be further optimized.
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// See https://github.com/miloyip/itoa-benchmark .
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void output_int(int64_t value) {
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if (value < 0) {
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*m_out += '-';
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value = -value;
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}
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char temp[20];
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char *t = temp;
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do {
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*t++ = char(value % 10) + '0';
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value /= 10;
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} while (value > 0);
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const auto old_size = m_out->size();
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m_out->resize(old_size + (t - temp));
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char* data = &(*m_out)[old_size];
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do {
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*data++ += *--t;
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} while (t != temp);
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}
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}; // class OutputBlock;
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/**
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* Virtual base class for all classes writing OSM files in different
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* formats.
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*
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* Do not use this class or derived classes directly. Use the
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* osmium::io::Writer class instead.
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*/
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class OutputFormat {
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protected:
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osmium::thread::Pool& m_pool;
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future_string_queue_type& m_output_queue;
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/**
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* Wrap the string into a future and add it to the output
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* queue.
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*/
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void send_to_output_queue(std::string&& data) {
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add_to_queue(m_output_queue, std::move(data));
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}
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public:
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OutputFormat(osmium::thread::Pool& pool, future_string_queue_type& output_queue) :
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m_pool(pool),
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m_output_queue(output_queue) {
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}
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OutputFormat(const OutputFormat&) = delete;
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OutputFormat(OutputFormat&&) = delete;
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OutputFormat& operator=(const OutputFormat&) = delete;
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OutputFormat& operator=(OutputFormat&&) = delete;
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virtual ~OutputFormat() noexcept = default;
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virtual void write_header(const osmium::io::Header&) {
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}
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virtual void write_buffer(osmium::memory::Buffer&&) = 0;
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virtual void write_end() {
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}
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}; // class OutputFormat
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/**
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* This factory class is used to create objects that write OSM data
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* into a specified output format.
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*
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* Do not use this class directly. Instead use the osmium::io::Writer
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* class.
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*/
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class OutputFormatFactory {
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public:
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using create_output_type = std::function<osmium::io::detail::OutputFormat*(osmium::thread::Pool&, const osmium::io::File&, future_string_queue_type&)>;
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private:
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using map_type = std::map<osmium::io::file_format, create_output_type>;
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map_type m_callbacks;
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OutputFormatFactory() :
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m_callbacks() {
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}
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public:
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static OutputFormatFactory& instance() {
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static OutputFormatFactory factory;
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return factory;
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}
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bool register_output_format(osmium::io::file_format format, create_output_type create_function) {
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if (! m_callbacks.insert(map_type::value_type(format, create_function)).second) {
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return false;
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}
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return true;
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}
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std::unique_ptr<osmium::io::detail::OutputFormat> create_output(osmium::thread::Pool& pool, const osmium::io::File& file, future_string_queue_type& output_queue) {
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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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return std::unique_ptr<osmium::io::detail::OutputFormat>((it->second)(pool, file, output_queue));
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}
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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 writing this format in this program."};
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}
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}; // class OutputFormatFactory
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class BlackholeOutputFormat : public osmium::io::detail::OutputFormat {
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public:
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BlackholeOutputFormat(osmium::thread::Pool& pool, const osmium::io::File& /*file*/, future_string_queue_type& output_queue) :
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OutputFormat(pool, output_queue) {
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}
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BlackholeOutputFormat(const BlackholeOutputFormat&) = delete;
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BlackholeOutputFormat& operator=(const BlackholeOutputFormat&) = delete;
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~BlackholeOutputFormat() noexcept final = default;
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void write_buffer(osmium::memory::Buffer&& /*buffer*/) final {
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}
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}; // class BlackholeOutputFormat
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// we want the register_output_format() function to run, setting
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// the variable is only a side-effect, it will never be used
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const bool registered_blackhole_output = osmium::io::detail::OutputFormatFactory::instance().register_output_format(osmium::io::file_format::blackhole,
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[](osmium::thread::Pool& pool, const osmium::io::File& file, future_string_queue_type& output_queue) {
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return new osmium::io::detail::BlackholeOutputFormat(pool, file, output_queue);
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});
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// dummy function to silence the unused variable warning from above
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inline bool get_registered_blackhole_output() noexcept {
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return registered_blackhole_output;
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}
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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_OUTPUT_FORMAT_HPP
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