/***************************************************************************** * * This file is part of Mapnik (c++ mapping toolkit) * * Copyright (C) 2015 Artem Pavlenko * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * *****************************************************************************/ // mapnik #include <mapnik/feature.hpp> #include <mapnik/feature_factory.hpp> #include <mapnik/json/geometry_grammar.hpp> #include <mapnik/json/feature_grammar.hpp> #include <mapnik/util/utf_conv_win.hpp> // stl #include <string> #include <vector> #include "geojson_memory_index_featureset.hpp" geojson_memory_index_featureset::geojson_memory_index_featureset(std::string const& filename, array_type && index_array) : #ifdef _WINDOWS file_(_wfopen(mapnik::utf8_to_utf16(filename).c_str(), L"rb"), std::fclose), #else file_(std::fopen(filename.c_str(),"rb"), std::fclose), #endif index_array_(std::move(index_array)), index_itr_(index_array_.begin()), index_end_(index_array_.end()), ctx_(std::make_shared<mapnik::context_type>()) { if (!file_) throw std::runtime_error("Can't open " + filename); } geojson_memory_index_featureset::~geojson_memory_index_featureset() {} mapnik::feature_ptr geojson_memory_index_featureset::next() { if (index_itr_ != index_end_) { geojson_datasource::item_type const& item = *index_itr_++; std::size_t file_offset = item.second.first; std::size_t size = item.second.second; std::fseek(file_.get(), file_offset, SEEK_SET); std::vector<char> json; json.resize(size); std::fread(json.data(), size, 1, file_.get()); using chr_iterator_type = char const*; chr_iterator_type start = json.data(); chr_iterator_type end = start + json.size(); static const mapnik::transcoder tr("utf8"); static const mapnik::json::feature_grammar<chr_iterator_type,mapnik::feature_impl> grammar(tr); using namespace boost::spirit; standard::space_type space; mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx_, feature_id_++)); if (!qi::phrase_parse(start, end, (grammar)(boost::phoenix::ref(*feature)), space) || start != end) { throw std::runtime_error("Failed to parse geojson feature"); } return feature; } return mapnik::feature_ptr(); }