8ce7a1c43d
e.g `mapnik::geometry::centroid()` -> `$(MAPNIK_SOURCE)/include/mapnik/geometry/centroid.hpp`
82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
/*****************************************************************************
|
|
*
|
|
* 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/feature_grammar.hpp>
|
|
#include <mapnik/util/utf_conv_win.hpp>
|
|
#include <mapnik/geometry/is_empty.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()
|
|
{
|
|
while (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");
|
|
}
|
|
// skip empty geometries
|
|
if (mapnik::geometry::is_empty(feature->get_geometry()))
|
|
continue;
|
|
return feature;
|
|
}
|
|
return mapnik::feature_ptr();
|
|
}
|