GeoJSONReader.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2021 Jared Erickson
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
 
#include <geos/io/GeoJSON.h>
#include <geos/geom/GeometryFactory.h>
#include <geos/geom/CoordinateSequence.h>
#include <geos/geom/Geometry.h>
#include <string>
#include "geos/vend/include_nlohmann_json.hpp"
 
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
class GeometryCollection;
class Point;
class LineString;
class LinearRing;
class Polygon;
class MultiPoint;
class MultiLineString;
class MultiPolygon;
class PrecisionModel;
}
}
 
namespace geos {
namespace io {
 
class GEOS_DLL GeoJSONReader {
public:
 
    GeoJSONReader(const geom::GeometryFactory& gf);
 
    GeoJSONReader();
 
    ~GeoJSONReader() = default;
 
    std::unique_ptr<geom::Geometry> read(const std::string& geoJsonText) const;
 
    GeoJSONFeatureCollection readFeatures(const std::string& geoJsonText) const;
 
private:
 
    const geom::GeometryFactory& geometryFactory;
    mutable int parseDepth_ = 0;
 
    std::unique_ptr<geom::Geometry> readFeatureForGeometry(const geos_nlohmann::json& j) const;
 
    GeoJSONFeature readFeature(const geos_nlohmann::json& j) const;
 
    std::map<std::string, GeoJSONValue> readProperties(const geos_nlohmann::json& p) const;
 
    GeoJSONValue readProperty(const geos_nlohmann::json& p) const;
 
    std::unique_ptr<geom::Geometry> readFeatureCollectionForGeometry(
        const geos_nlohmann::json& j) const;
 
    GeoJSONFeatureCollection readFeatureCollection(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::Geometry> readGeometry(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::Point> readPoint(const geos_nlohmann::json& j) const;
 
    geom::Coordinate readCoordinate(const std::vector<double>& coords) const;
 
    std::unique_ptr<geom::LineString> readLineString(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::Polygon> readPolygon(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::Polygon> readPolygon(
        const std::vector<std::vector<std::vector<double>>>& c) const;
 
    std::unique_ptr<geom::MultiPoint> readMultiPoint(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::MultiLineString> readMultiLineString(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::MultiPolygon> readMultiPolygon(
        const geos_nlohmann::json& j) const;
 
    std::unique_ptr<geom::GeometryCollection> readGeometryCollection(
        const geos_nlohmann::json& j) const;
 
};
 
} // namespace io
} // namespace geos