mapnik/plugins/input/csv/csv_datasource.hpp

/*****************************************************************************
 *
 * 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
 *
 *****************************************************************************/

#ifndef MAPNIK_CSV_DATASOURCE_HPP
#define MAPNIK_CSV_DATASOURCE_HPP

// mapnik
#include <mapnik/datasource.hpp>
#include <mapnik/params.hpp>
#include <mapnik/query.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/coord.hpp>
#include <mapnik/feature_layer_desc.hpp>
#include <mapnik/value_types.hpp>

#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/optional.hpp>
#include <boost/version.hpp>
#include <boost/geometry/index/rtree.hpp>
#pragma GCC diagnostic pop

// stl
#include <vector>
#include <deque>
#include <string>

template <std::size_t Max, std::size_t Min>
struct csv_linear : boost::geometry::index::linear<Max,Min> {};

namespace boost { namespace geometry { namespace index { namespace detail { namespace rtree {

template <std::size_t Max, std::size_t Min>
struct options_type<csv_linear<Max,Min> >
{
    using type = options<csv_linear<Max, Min>,
                         insert_default_tag,
                         choose_by_content_diff_tag,
                         split_default_tag,
                         linear_tag,
#if BOOST_VERSION >= 105700
                         node_variant_static_tag>;
#else
                         node_s_mem_static_tag>;

#endif
};
}}}}}

class csv_datasource : public mapnik::datasource
{
public:
    using box_type = mapnik::box2d<double>;
    using item_type = std::pair<box_type, std::pair<std::size_t, std::size_t>>;
    using spatial_index_type = boost::geometry::index::rtree<item_type,csv_linear<16,4>>;

    csv_datasource(mapnik::parameters const& params);
    virtual ~csv_datasource ();
    mapnik::datasource::datasource_t type() const;
    static const char * name();
    mapnik::featureset_ptr features(mapnik::query const& q) const;
    mapnik::featureset_ptr features_at_point(mapnik::coord2d const& pt, double tol = 0) const;
    mapnik::box2d<double> envelope() const;
    mapnik::layer_descriptor get_descriptor() const;
    boost::optional<mapnik::datasource_geometry_t> get_geometry_type() const;
private:
    template <typename T>
    void parse_csv(T & stream);
    template <typename T>
    boost::optional<mapnik::datasource_geometry_t> get_geometry_type_impl(T & stream) const;

    mapnik::layer_descriptor desc_;
    mapnik::box2d<double> extent_;
    std::string filename_;
    mapnik::value_integer row_limit_;
    std::string inline_string_;
    char separator_;
    char quote_;
    std::vector<std::string> headers_;
    std::string manual_headers_;
    bool strict_;
    mapnik::context_ptr ctx_;
    bool extent_initialized_;
    std::unique_ptr<spatial_index_type> tree_;
    detail::geometry_column_locator locator_;
    bool has_disk_index_;
};

#endif // MAPNIK_CSV_DATASOURCE_HPP