117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2021 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 "csv_featureset.hpp"
|
|
#include <mapnik/debug.hpp>
|
|
#include <mapnik/feature.hpp>
|
|
#include <mapnik/feature_factory.hpp>
|
|
#include <mapnik/util/utf_conv_win.hpp>
|
|
// stl
|
|
#include <string>
|
|
#include <vector>
|
|
#include <deque>
|
|
|
|
csv_featureset::csv_featureset(std::string const& filename,
|
|
locator_type const& locator,
|
|
char separator,
|
|
char quote,
|
|
std::vector<std::string> const& headers,
|
|
mapnik::context_ptr const& ctx,
|
|
array_type&& index_array)
|
|
:
|
|
#if defined(MAPNIK_MEMORY_MAPPED_FILE)
|
|
//
|
|
#elif defined(_WIN32)
|
|
file_(_wfopen(mapnik::utf8_to_utf16(filename).c_str(), L"rb"), std::fclose)
|
|
,
|
|
#else
|
|
file_(std::fopen(filename.c_str(), "rb"), std::fclose)
|
|
,
|
|
#endif
|
|
separator_(separator)
|
|
, quote_(quote)
|
|
, headers_(headers)
|
|
, index_array_(std::move(index_array))
|
|
, index_itr_(index_array_.begin())
|
|
, index_end_(index_array_.end())
|
|
, ctx_(ctx)
|
|
, locator_(locator)
|
|
, tr_("utf8")
|
|
{
|
|
#if defined(MAPNIK_MEMORY_MAPPED_FILE)
|
|
const auto memory = mapnik::mapped_memory_cache::instance().find(filename, true);
|
|
if (memory.has_value())
|
|
{
|
|
mapped_region_ = *memory;
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error("could not create file mapping for " + filename);
|
|
}
|
|
#else
|
|
if (!file_)
|
|
throw std::runtime_error("Can't open " + filename);
|
|
#endif
|
|
}
|
|
|
|
csv_featureset::~csv_featureset() {}
|
|
|
|
mapnik::feature_ptr csv_featureset::parse_feature(char const* beg, char const* end)
|
|
{
|
|
auto values = csv_utils::parse_line(beg, end, separator_, quote_, headers_.size());
|
|
auto geom = csv_utils::extract_geometry(values, locator_);
|
|
if (!geom.is<mapnik::geometry::geometry_empty>())
|
|
{
|
|
mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx_, ++feature_id_));
|
|
feature->set_geometry(std::move(geom));
|
|
csv_utils::process_properties(*feature, headers_, values, locator_, tr_);
|
|
return feature;
|
|
}
|
|
return mapnik::feature_ptr();
|
|
}
|
|
|
|
mapnik::feature_ptr csv_featureset::next()
|
|
{
|
|
if (index_itr_ != index_end_)
|
|
{
|
|
csv_datasource::item_type const& item = *index_itr_++;
|
|
std::uint64_t file_offset = item.second.first;
|
|
std::uint64_t size = item.second.second;
|
|
#if defined(MAPNIK_MEMORY_MAPPED_FILE)
|
|
char const* start = (char const*)mapped_region_->get_address() + file_offset;
|
|
char const* end = start + size;
|
|
#else
|
|
std::fseek(file_.get(), file_offset, SEEK_SET);
|
|
std::vector<char> record;
|
|
record.resize(size);
|
|
if (std::fread(record.data(), size, 1, file_.get()) != 1)
|
|
{
|
|
return mapnik::feature_ptr();
|
|
}
|
|
auto const* start = record.data();
|
|
auto const* end = start + record.size();
|
|
#endif
|
|
return parse_feature(start, end);
|
|
}
|
|
return mapnik::feature_ptr();
|
|
}
|