WKBReader.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * 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.
 *
 **********************************************************************
 *
 * Last port: io/WKBReader.java rev. 1.1 (JTS-1.7)
 *
 **********************************************************************/

#pragma once

#include <geos/export.h>
#include <geos/geom/Geometry.h>
#include <geos/geom/GeometryTypeName.h>
#include <geos/io/ByteOrderDataInStream.h> // for composition

#include <iosfwd> // ostream, istream
#include <memory>
// #include <vector>
#include <array>

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif

// Forward declarations
namespace geos {
namespace geom {

class GeometryFactory;
class Coordinate;
class CircularString;
class CompoundCurve;
class CurvePolygon;
class Geometry;
enum GeometryTypeId : int;
class GeometryCollection;
class Point;
class LineString;
class LinearRing;
class Polygon;
class MultiCurve;
class MultiPoint;
class MultiLineString;
class MultiPolygon;
class MultiSurface;
class PrecisionModel;
class CoordinateSequence;
class SimpleCurve;

} // namespace geom
} // namespace geos


namespace geos {
namespace io {

class GEOS_DLL WKBReader {

public:

    WKBReader(geom::GeometryFactory const& f);

    WKBReader();

    void setFixStructure(bool doFixStructure);

    std::unique_ptr<geom::Geometry> read(std::istream& is);

    std::unique_ptr<geom::Geometry> read(const unsigned char* buf, size_t size);

    std::unique_ptr<geom::Geometry> readHEX(std::istream& is);

    static std::ostream& printHEX(std::istream& is, std::ostream& os);

private:

    const geom::GeometryFactory& factory;

    // for now support the WKB standard only - may be generalized later
    unsigned int inputDimension;
    bool hasZ;
    bool hasM;
    bool fixStructure;

    ByteOrderDataInStream dis;

    std::array<double, 4> ordValues;

    std::unique_ptr<geom::Geometry> readGeometry();

    std::unique_ptr<geom::Point> readPoint();

    std::unique_ptr<geom::LineString> readLineString();

    std::unique_ptr<geom::LinearRing> readLinearRing();

    std::unique_ptr<geom::CircularString> readCircularString();

    std::unique_ptr<geom::CompoundCurve> readCompoundCurve();

    std::unique_ptr<geom::Polygon> readPolygon();

    std::unique_ptr<geom::CurvePolygon> readCurvePolygon();

    std::unique_ptr<geom::MultiPoint> readMultiPoint();

    std::unique_ptr<geom::MultiLineString> readMultiLineString();

    std::unique_ptr<geom::MultiCurve> readMultiCurve();

    std::unique_ptr<geom::MultiPolygon> readMultiPolygon();

    std::unique_ptr<geom::MultiSurface> readMultiSurface();

    std::unique_ptr<geom::GeometryCollection> readGeometryCollection();

    std::unique_ptr<geom::CoordinateSequence> readCoordinateSequence(unsigned int); // throws IOException

    void minMemSize(geom::GeometryTypeId geomType, uint64_t size) const;

    void readCoordinate(); // throws IOException

    template<typename T>
    std::unique_ptr<T> readChild()
    {
        auto g = readGeometry();
        if (dynamic_cast<const T*>(g.get())) {
            return std::unique_ptr<T>(static_cast<T*>(g.release()));
        }
        throw io::ParseException(std::string("Expected ") + geom::GeometryTypeName<T>::name + " but got " + g->getGeometryType());
    }

    // Declare type as noncopyable
    WKBReader(const WKBReader& other) = delete;
    WKBReader& operator=(const WKBReader& rhs) = delete;
};

} // namespace io
} // namespace geos

#ifdef _MSC_VER
#pragma warning(pop)
#endif