Label.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/Label.java r428 (JTS-1.12+)
 *
 **********************************************************************/
 
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Location.h>
#include <geos/geomgraph/TopologyLocation.h>
 
#include <iosfwd> // for operator<<
#include <cassert>
 
namespace geos {
namespace geomgraph { // geos.geomgraph
 
class GEOS_DLL Label final {
    using Position = geos::geom::Position;
 
public:
 
    friend std::ostream& operator<< (std::ostream&, const Label&);
 
    static Label toLineLabel(const Label& label)
    {
        Label lineLabel(geom::Location::NONE);
        for(uint32_t i = 0; i < 2; i++) {
            lineLabel.setLocation(i, label.getLocation(i));
        }
        return lineLabel;
    };
 
    Label(geom::Location onLoc)
        : elt{TopologyLocation(onLoc)
        , TopologyLocation(onLoc)}
        {};
 
    Label(uint32_t geomIndex, geom::Location onLoc)
        : elt{TopologyLocation(geom::Location::NONE)
        , TopologyLocation(geom::Location::NONE)}
    {
        assert(geomIndex < 2);
        elt[geomIndex].setLocation(onLoc);
    };
 
    Label(geom::Location onLoc, geom::Location leftLoc, geom::Location rightLoc)
        : elt {TopologyLocation(onLoc, leftLoc, rightLoc)
        , TopologyLocation(onLoc, leftLoc, rightLoc)}
        {};
 
    Label(const Label& l)
        : elt{TopologyLocation(l.elt[0])
        , TopologyLocation(l.elt[1])}
        {};
 
    Label()
        : elt{TopologyLocation(geom::Location::NONE)
        , TopologyLocation(geom::Location::NONE)}
        {};
 
    Label(uint32_t geomIndex, geom::Location onLoc, geom::Location leftLoc, geom::Location rightLoc)
    {
        elt[0] = TopologyLocation(geom::Location::NONE, geom::Location::NONE, geom::Location::NONE);
        elt[1] = TopologyLocation(geom::Location::NONE, geom::Location::NONE, geom::Location::NONE);
        elt[geomIndex].setLocations(onLoc, leftLoc, rightLoc);
    };
 
    Label&
    operator=(const Label& l)
    {
        elt[0] = TopologyLocation(l.elt[0]);
        elt[1] = TopologyLocation(l.elt[1]);
        return *this;
    };
 
    void flip()
    {
        elt[0].flip();
        elt[1].flip();
    };
 
    void merge(const Label& lbl)
    {
        for(int i = 0; i < 2; i++) {
            elt[i].merge(lbl.elt[i]);
        }
    };
 
    int getGeometryCount() const
    {
        int count = 0;
        if(!elt[0].isNull()) {
            count++;
        }
        if(!elt[1].isNull()) {
            count++;
        }
        return count;
    };
 
    geom::Location getLocation(uint32_t geomIndex, uint32_t posIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].get(posIndex);
    };
 
    geom::Location getLocation(uint32_t geomIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].get(Position::ON);
    };
 
    void setLocation(uint32_t geomIndex, uint32_t posIndex, geom::Location location)
    {
        assert(geomIndex < 2);
        elt[geomIndex].setLocation(posIndex, location);
    };
 
    void setLocation(uint32_t geomIndex, geom::Location location)
    {
        assert(geomIndex < 2);
        elt[geomIndex].setLocation(Position::ON, location);
    };
 
    void setAllLocations(uint32_t geomIndex, geom::Location location)
    {
        assert(geomIndex < 2);
        elt[geomIndex].setAllLocations(location);
    };
 
    void setAllLocationsIfNull(uint32_t geomIndex, geom::Location location)
    {
        assert(geomIndex < 2);
        elt[geomIndex].setAllLocationsIfNull(location);
    };
 
    void setAllLocationsIfNull(geom::Location location)
    {
        setAllLocationsIfNull(0, location);
        setAllLocationsIfNull(1, location);
    };
 
    bool isNull(uint32_t geomIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].isNull();
    };
 
    bool isNull() const
    {
        return elt[0].isNull() && elt[1].isNull();
    };
 
    bool isAnyNull(uint32_t geomIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].isAnyNull();
    };
 
    bool isArea() const
    {
        return elt[0].isArea() || elt[1].isArea();
    };
 
    bool isArea(uint32_t geomIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].isArea();
    };
 
    bool isLine(uint32_t geomIndex) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].isLine();
    };
 
    bool isEqualOnSide(const Label& lbl, uint32_t side) const
    {
        return elt[0].isEqualOnSide(lbl.elt[0], side)
                && elt[1].isEqualOnSide(lbl.elt[1], side);
    };
 
    bool allPositionsEqual(uint32_t geomIndex, geom::Location loc) const
    {
        assert(geomIndex < 2);
        return elt[geomIndex].allPositionsEqual(loc);
    };
 
    void toLine(uint32_t geomIndex)
    {
        assert(geomIndex < 2);
        if(elt[geomIndex].isArea()) {
            elt[geomIndex] = TopologyLocation(elt[geomIndex].getLocations()[0]);
        }
    };
 
    std::string toString() const;
 
private:
 
    TopologyLocation elt[2];
 
};
 
std::ostream& operator<< (std::ostream&, const Label&);
 
} // namespace geos.geomgraph
} // namespace geos