TopologyLocation.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: geomgraph/TopologyLocation.java r428 (JTS-1.12+)
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Location.h>
#include <geos/geom/Position.h>
 
#include <vector>
#include <array>
#include <string>
#include <cassert>
#include <cstdint>
 
#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
 
namespace geos {
namespace geomgraph { // geos.geomgraph
 
class GEOS_DLL TopologyLocation {
    using Position = geos::geom::Position;
    using Location = geos::geom::Location;
 
public:
 
    friend std::ostream& operator<< (std::ostream&, const TopologyLocation&);
 
    TopologyLocation() = default;
 
    TopologyLocation(Location on, Location left, Location right)
        : locationSize(3)
    {
        location[Position::ON] = on;
        location[Position::LEFT] = left;
        location[Position::RIGHT] = right;
    }
 
    TopologyLocation(Location on)
        : locationSize(1)
    {
        location.fill(Location::NONE);
        location[Position::ON] = on;
    };
 
    TopologyLocation(const TopologyLocation& gl)
        : location(gl.location)
        , locationSize(gl.locationSize)
        {};
 
    TopologyLocation& operator= (const TopologyLocation& gl)
    {
        location = gl.location;
        locationSize = gl.locationSize;
        return *this;
    };
 
    Location get(std::size_t posIndex) const
    {
        // should be an assert() instead ?
        if(posIndex < locationSize) {
            return location[posIndex];
        }
        return Location::NONE;
    };
 
    bool isNull() const
    {
        for(std::size_t i = 0; i < locationSize; ++i) {
            if(location[i] != Location::NONE) {
                return false;
            }
        }
        return true;
    };
 
    bool isAnyNull() const
    {
        for(std::size_t i = 0; i < locationSize; ++i) {
            if(location[i] == Location::NONE) {
                return true;
            }
        }
        return false;
    };
 
    bool isEqualOnSide(const TopologyLocation& le, uint32_t locIndex) const
    {
        return location[locIndex] == le.location[locIndex];
    };
 
    bool isArea() const
    {
        return locationSize > 1;
    };
 
    bool isLine() const
    {
        return locationSize == 1;
    };
 
    void flip()
    {
        if(locationSize <= 1) {
            return;
        }
        std::swap(location[Position::LEFT], location[Position::RIGHT]);
    };
 
    void setAllLocations(Location locValue)
    {
        location.fill(locValue);
    };
 
 
    void setAllLocationsIfNull(Location locValue)
    {
        for(std::size_t i = 0; i < locationSize; ++i) {
            if(location[i] == Location::NONE) {
                location[i] = locValue;
            }
        }
    };
 
    void setLocation(std::size_t locIndex, Location locValue)
    {
        location[locIndex] = locValue;
    };
 
    void setLocation(Location locValue)
    {
        setLocation(Position::ON, locValue);
    };
 
    const std::array<Location, 3>& getLocations() const
    {
        return location;
    };
 
    void setLocations(Location on, Location left, Location right)
    {
        assert(locationSize >= 3);
        location[Position::ON] = on;
        location[Position::LEFT] = left;
        location[Position::RIGHT] = right;
    };
 
    bool allPositionsEqual(Location loc) const
    {
        for(std::size_t i = 0; i < locationSize; ++i) {
            if(location[i] != loc) {
                return false;
            }
        }
        return true;
    };
 
    void merge(const TopologyLocation& gl);
 
    std::string toString() const;
 
 
private:
 
    std::array<geom::Location, 3> location;
    std::uint8_t locationSize;
 
};
 
std::ostream& operator<< (std::ostream&, const TopologyLocation&);
 
} // namespace geos.geomgraph
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif