146 lines
5.4 KiB
C++
146 lines
5.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#include "process_geojson_file.hpp"
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/streams/bufferstream.hpp>
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#include <boost/spirit/include/qi.hpp>
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#pragma GCC diagnostic pop
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#include <mapnik/mapped_memory_cache.hpp>
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#else
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#include <mapnik/util/file_io.hpp>
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#endif
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#include <mapnik/json/extract_bounding_box_grammar_impl.hpp>
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#include <mapnik/json/feature_collection_grammar_impl.hpp>
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namespace {
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template <typename T>
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struct feature_validate_callback
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{
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feature_validate_callback(mapnik::box2d<T> const& box)
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: box_(box) {}
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void operator() (mapnik::feature_ptr const& f) const
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{
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if (box_ != box_)
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{
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throw std::runtime_error("Bounding boxes mismatch validation feature");
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}
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}
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mapnik::box2d<T> const& box_;
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};
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using box_type = mapnik::box2d<float>;
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using boxes_type = std::vector<std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
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using base_iterator_type = char const*;
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const mapnik::json::extract_bounding_box_grammar<base_iterator_type, boxes_type> geojson_datasource_static_bbox_grammar;
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const mapnik::transcoder tr("utf8");
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const mapnik::json::feature_grammar_callback<base_iterator_type, mapnik::feature_impl, feature_validate_callback<float>> fc_grammar(tr);
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}
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namespace mapnik { namespace detail {
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template <typename T>
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std::pair<bool,typename T::value_type::first_type> process_geojson_file(T & boxes, std::string const& filename, bool validate_features, bool verbose)
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{
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using box_type = typename T::value_type::first_type;
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box_type extent;
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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mapnik::mapped_region_ptr mapped_region;
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boost::optional<mapnik::mapped_region_ptr> memory =
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mapnik::mapped_memory_cache::instance().find(filename, true);
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if (!memory)
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{
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std::clog << "Error : cannot memory map " << filename << std::endl;
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return std::make_pair(false, extent);
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}
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else
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{
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mapped_region = *memory;
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}
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char const* start = reinterpret_cast<char const*>(mapped_region->get_address());
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char const* end = start + mapped_region->get_size();
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#else
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mapnik::util::file file(filename);
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if (!file)
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{
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std::clog << "Error : cannot open " << filename << std::endl;
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return std::make_pair(false, extent);
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}
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std::string file_buffer;
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file_buffer.resize(file.size());
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std::fread(&file_buffer[0], file.size(), 1, file.get());
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char const* start = file_buffer.c_str();
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char const* end = start + file_buffer.length();
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#endif
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boost::spirit::standard::space_type space;
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auto const* itr = start;
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try
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{
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if (!boost::spirit::qi::phrase_parse(itr, end, (geojson_datasource_static_bbox_grammar)(boost::phoenix::ref(boxes)) , space))
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{
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std::clog << "mapnik-index (GeoJSON) : could not extract bounding boxes from : '" << filename << "'" << std::endl;
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return std::make_pair(false, extent);
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}
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}
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catch (std::exception const& ex)
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{
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std::clog << "mapnik-index (GeoJSON): " << ex.what() << std::endl;
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}
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mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>();
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std::size_t start_id = 1;
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for (auto const& item : boxes)
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{
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if (item.first.valid())
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{
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if (!extent.valid()) extent = item.first;
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else extent.expand_to_include(item.first);
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if (validate_features)
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{
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base_iterator_type feat_itr = start + item.second.first;
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base_iterator_type feat_end = feat_itr + item.second.second;
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feature_validate_callback<float> callback(item.first);
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bool result = boost::spirit::qi::phrase_parse(feat_itr, feat_end, (fc_grammar)
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(boost::phoenix::ref(ctx), boost::phoenix::ref(start_id), boost::phoenix::ref(callback)),
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space);
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if (!result || feat_itr != feat_end)
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{
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if (verbose) std::clog << std::string(start + item.second.first, feat_end ) << std::endl;
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return std::make_pair(false, extent);
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}
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}
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}
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}
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return std::make_pair(true, extent);
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}
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template std::pair<bool,box_type> process_geojson_file(boxes_type&, std::string const&, bool, bool);
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}}
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