/******************************************************************************
 *
 * Project:  OpenGIS Simple Features Reference Implementation
 * Purpose:  The OGRCurvePolygon geometry class.
 * Author:   Even Rouault <even dot rouault at spatialys dot com>
 *
 ******************************************************************************
 * Copyright (c) 2014, Even Rouault <even dot rouault at spatialys dot com>
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "ogr_geometry.h"

#include <cstddef>

#include "cpl_error.h"
#include "ogr_api.h"
#include "ogr_core.h"
#include "ogr_geos.h"
#include "ogr_sfcgal.h"
#include "ogr_p.h"
#include "ogr_spatialref.h"

/************************************************************************/
/*               OGRCurvePolygon( const OGRCurvePolygon& )              */
/************************************************************************/

/**
 * \brief Copy constructor.
 */

OGRCurvePolygon::OGRCurvePolygon(const OGRCurvePolygon &) = default;

/************************************************************************/
/*                 operator=( const OGRCurvePolygon&)                  */
/************************************************************************/

/**
 * \brief Assignment operator.
 */

OGRCurvePolygon &OGRCurvePolygon::operator=(const OGRCurvePolygon &other)
{
    if (this != &other)
    {
        OGRSurface::operator=(other);

        for (const auto *poRing : other.oCC)
        {
            if (!isRingCorrectType(poRing))
            {
                CPLError(CE_Failure, CPLE_AppDefined,
                         "Illegal use of OGRCurvePolygon::operator=(): "
                         "trying to assign an incompatible sub-geometry");
                return *this;
            }
        }

        oCC = other.oCC;
    }
    return *this;
}

/************************************************************************/
/*                               clone()                                */
/************************************************************************/

OGRCurvePolygon *OGRCurvePolygon::clone() const

{
    return new (std::nothrow) OGRCurvePolygon(*this);
}

/************************************************************************/
/*                               empty()                                */
/************************************************************************/

void OGRCurvePolygon::empty()

{
    oCC.empty(this);
}

/************************************************************************/
/*                          getGeometryType()                           */
/************************************************************************/

OGRwkbGeometryType OGRCurvePolygon::getGeometryType() const

{
    if ((flags & OGR_G_3D) && (flags & OGR_G_MEASURED))
        return wkbCurvePolygonZM;
    else if (flags & OGR_G_MEASURED)
        return wkbCurvePolygonM;
    else if (flags & OGR_G_3D)
        return wkbCurvePolygonZ;
    else
        return wkbCurvePolygon;
}

/************************************************************************/
/*                            getDimension()                            */
/************************************************************************/

int OGRCurvePolygon::getDimension() const

{
    return 2;
}

/************************************************************************/
/*                            flattenTo2D()                             */
/************************************************************************/

void OGRCurvePolygon::flattenTo2D()

{
    oCC.flattenTo2D(this);
}

/************************************************************************/
/*                          getGeometryName()                           */
/************************************************************************/

const char *OGRCurvePolygon::getGeometryName() const

{
    return "CURVEPOLYGON";
}

/************************************************************************/
/*                         getExteriorRingCurve()                       */
/************************************************************************/

/**
 * \brief Fetch reference to external polygon ring.
 *
 * Note that the returned ring pointer is to an internal data object of the
 * OGRCurvePolygon.  It should not be modified or deleted by the application,
 * and the pointer is only valid till the polygon is next modified.  Use the
 * OGRGeometry::clone() method to make a separate copy within the application.
 *
 * Relates to the Simple Features for COM (SFCOM) IPolygon::get_ExteriorRing()
 * method.
 * TODO(rouault): What does that mean?
 *
 * @return pointer to external ring.  May be NULL if the OGRCurvePolygon is
 * empty.
 */

OGRCurve *OGRCurvePolygon::getExteriorRingCurve()

{
    return oCC.getCurve(0);
}

/**
 * \brief Fetch reference to external polygon ring.
 *
 * Note that the returned ring pointer is to an internal data object of the
 * OGRCurvePolygon.  It should not be modified or deleted by the application,
 * and the pointer is only valid till the polygon is next modified.  Use the
 * OGRGeometry::clone() method to make a separate copy within the application.
 *
 * Relates to the SFCOM IPolygon::get_ExteriorRing() method.
 *
 * @return pointer to external ring.  May be NULL if the OGRCurvePolygon is
 * empty.
 */
const OGRCurve *OGRCurvePolygon::getExteriorRingCurve() const

{
    return oCC.getCurve(0);
}

/************************************************************************/
/*                        getNumInteriorRings()                         */
/************************************************************************/

/**
 * \brief Fetch the number of internal rings.
 *
 * Relates to the SFCOM IPolygon::get_NumInteriorRings() method.
 *
 * @return count of internal rings, zero or more.
 */

int OGRCurvePolygon::getNumInteriorRings() const

{
    if (oCC.nCurveCount > 0)
        return oCC.nCurveCount - 1;
    else
        return 0;
}

/************************************************************************/
/*                       getInteriorRingCurve()                         */
/************************************************************************/

/**
 * \brief Fetch reference to indicated internal ring.
 *
 * Note that the returned ring pointer is to an internal data object of the
 * OGRCurvePolygon.  It should not be modified or deleted by the application,
 * and the pointer is only valid till the polygon is next modified.  Use the
 * OGRGeometry::clone() method to make a separate copy within the application.
 *
 * Relates to the SFCOM IPolygon::get_InternalRing() method.
 *
 * @param iRing internal ring index from 0 to getNumInteriorRings() - 1.
 *
 * @return pointer to interior ring.  May be NULL.
 */

OGRCurve *OGRCurvePolygon::getInteriorRingCurve(int iRing)

{
    return oCC.getCurve(iRing + 1);
}

/**
 * \brief Fetch reference to indicated internal ring.
 *
 * Note that the returned ring pointer is to an internal data object of the
 * OGRCurvePolygon.  It should not be modified or deleted by the application,
 * and the pointer is only valid till the polygon is next modified.  Use the
 * OGRGeometry::clone() method to make a separate copy within the application.
 *
 * Relates to the SFCOM IPolygon::get_InternalRing() method.
 *
 * @param iRing internal ring index from 0 to getNumInteriorRings() - 1.
 *
 * @return pointer to interior ring.  May be NULL.
 */

const OGRCurve *OGRCurvePolygon::getInteriorRingCurve(int iRing) const

{
    return oCC.getCurve(iRing + 1);
}

/************************************************************************/
/*                        stealExteriorRingCurve()                      */
/************************************************************************/

/**
 * \brief "Steal" reference to external ring.
 *
 * After the call to that function, only call to stealInteriorRing() or
 * destruction of the OGRCurvePolygon is valid. Other operations may crash.
 *
 * @return pointer to external ring.  May be NULL if the OGRCurvePolygon is
 * empty.
 */

OGRCurve *OGRCurvePolygon::stealExteriorRingCurve()
{
    if (oCC.nCurveCount == 0)
        return nullptr;
    OGRCurve *poRet = oCC.papoCurves[0];
    oCC.papoCurves[0] = nullptr;
    return poRet;
}

/************************************************************************/
/*                            removeRing()                              */
/************************************************************************/

/**
 * \brief Remove a geometry from the container.
 *
 * Removing a geometry will cause the geometry count to drop by one, and all
 * "higher" geometries will shuffle down one in index.
 *
 * There is no SFCOM analog to this method.
 *
 * @param iIndex the index of the geometry to delete.  A value of -1 is a
 * special flag meaning that all geometries should be removed.
 *
 * @param bDelete if true the geometry will be deallocated, otherwise it will
 * not.  The default is true as the container is considered to own the
 * geometries in it.
 *
 * @return OGRERR_NONE if successful, or OGRERR_FAILURE if the index is
 * out of range.
 */

OGRErr OGRCurvePolygon::removeRing(int iIndex, bool bDelete)
{
    return oCC.removeCurve(iIndex, bDelete);
}

/************************************************************************/
/*                              addRing()                               */
/************************************************************************/

/**
 * \brief Add a ring to a polygon.
 *
 * If the polygon has no external ring (it is empty) this will be used as
 * the external ring, otherwise it is used as an internal ring.  The passed
 * OGRCurve remains the responsibility of the caller (an internal copy
 * is made).
 *
 * This method has no SFCOM analog.
 *
 * @param poNewRing ring to be added to the polygon.
 * @return OGRERR_NONE in case of success
 */

OGRErr OGRCurvePolygon::addRing(const OGRCurve *poNewRing)

{
    OGRCurve *poNewRingCloned = poNewRing->clone();
    OGRErr eErr = addRingDirectly(poNewRingCloned);
    if (eErr != OGRERR_NONE)
        delete poNewRingCloned;
    return eErr;
}

/************************************************************************/
/*                            isRingCorrectType()                       */
/************************************************************************/
bool OGRCurvePolygon::isRingCorrectType(const OGRCurve *poRing) const
{
    return poRing && !EQUAL(poRing->getGeometryName(), "LINEARRING");
}

/************************************************************************/
/*                            checkRing()                               */
/************************************************************************/

bool OGRCurvePolygon::checkRing(const OGRCurve *poNewRing) const
{
    if (!isRingCorrectType(poNewRing))
    {
        CPLError(CE_Failure, CPLE_AppDefined, "Linearring not allowed.");
        return false;
    }

    if (!poNewRing->IsEmpty() && !poNewRing->get_IsClosed())
    {
        // This configuration option name must be the same as in
        // OGRPolygon::checkRing()
        const char *pszEnvVar =
            CPLGetConfigOption("OGR_GEOMETRY_ACCEPT_UNCLOSED_RING", nullptr);
        if (pszEnvVar != nullptr && !CPLTestBool(pszEnvVar))
        {
            CPLError(CE_Failure, CPLE_AppDefined, "Non closed ring detected.");
            return false;
        }
        else
        {
            CPLError(CE_Warning, CPLE_AppDefined, "Non closed ring detected.%s",
                     pszEnvVar == nullptr
                         ? " To avoid accepting it, set the "
                           "OGR_GEOMETRY_ACCEPT_UNCLOSED_RING configuration "
                           "option to NO"
                         : "");
        }
    }

    if (wkbFlatten(poNewRing->getGeometryType()) == wkbLineString)
    {
        if (poNewRing->getNumPoints() < 4)
        {
            return false;
        }
    }

    return true;
}

/************************************************************************/
/*                          addRingDirectly()                           */
/************************************************************************/

/**
 * \brief Add a ring to a polygon.
 *
 * If the polygon has no external ring (it is empty) this will be used as
 * the external ring, otherwise it is used as an internal ring.  Ownership
 * of the passed ring is assumed by the OGRCurvePolygon, but otherwise this
 * method operates the same as OGRCurvePolygon::AddRing().
 *
 * This method has no SFCOM analog.
 *
 * @param poNewRing ring to be added to the polygon.
 * @return OGRERR_NONE in case of success
 */

OGRErr OGRCurvePolygon::addRingDirectly(OGRCurve *poNewRing)
{
    return addRingDirectlyInternal(poNewRing, TRUE);
}

OGRErr OGRCurvePolygon::addRingDirectlyInternal(OGRCurve *poNewRing,
                                                int bNeedRealloc)
{
    if (!checkRing(poNewRing))
        return OGRERR_UNSUPPORTED_GEOMETRY_TYPE;

    HomogenizeDimensionalityWith(poNewRing);

    return oCC.addCurveDirectly(this, poNewRing, bNeedRealloc);
}

/************************************************************************/
/*                             addRing()                                */
/************************************************************************/

/**
 * \brief Add a ring to a polygon.
 *
 * If the polygon has no external ring (it is empty) this will be used as
 * the external ring, otherwise it is used as an internal ring.
 *
 * This method has no SFCOM analog.
 *
 * @param poNewRing ring to be added to the polygon.
 * @return OGRERR_NONE in case of success
 */
OGRErr OGRCurvePolygon::addRing(std::unique_ptr<OGRCurve> poNewRing)
{
    OGRCurve *poNewRingPtr = poNewRing.release();
    OGRErr eErr = addRingDirectlyInternal(poNewRingPtr, TRUE);
    if (eErr != OGRERR_NONE)
        delete poNewRingPtr;
    return eErr;
}

/************************************************************************/
/*                              WkbSize()                               */
/*                                                                      */
/*      Return the size of this object in well known binary             */
/*      representation including the byte order, and type information.  */
/************************************************************************/

size_t OGRCurvePolygon::WkbSize() const

{
    return oCC.WkbSize();
}

/************************************************************************/
/*                       addCurveDirectlyFromWkb()                      */
/************************************************************************/

OGRErr OGRCurvePolygon::addCurveDirectlyFromWkb(OGRGeometry *poSelf,
                                                OGRCurve *poCurve)
{
    OGRCurvePolygon *poCP = poSelf->toCurvePolygon();
    return poCP->addRingDirectlyInternal(poCurve, FALSE);
}

/************************************************************************/
/*                           importFromWkb()                            */
/*                                                                      */
/*      Initialize from serialized stream in well known binary          */
/*      format.                                                         */
/************************************************************************/

OGRErr OGRCurvePolygon::importFromWkb(const unsigned char *pabyData,
                                      size_t nSize, OGRwkbVariant eWkbVariant,
                                      size_t &nBytesConsumedOut)

{
    nBytesConsumedOut = 0;
    OGRwkbByteOrder eByteOrder;
    size_t nDataOffset = 0;
    // coverity[tainted_data]
    OGRErr eErr = oCC.importPreambleFromWkb(this, pabyData, nSize, nDataOffset,
                                            eByteOrder, 9, eWkbVariant);
    if (eErr != OGRERR_NONE)
        return eErr;

    eErr = oCC.importBodyFromWkb(this, pabyData + nDataOffset, nSize,
                                 true,  // bAcceptCompoundCurve
                                 addCurveDirectlyFromWkb, eWkbVariant,
                                 nBytesConsumedOut);
    if (eErr == OGRERR_NONE)
        nBytesConsumedOut += nDataOffset;
    return eErr;
}

/************************************************************************/
/*                            exportToWkb()                             */
/*                                                                      */
/*      Build a well known binary representation of this object.        */
/************************************************************************/

OGRErr OGRCurvePolygon::exportToWkb(unsigned char *pabyData,
                                    const OGRwkbExportOptions *psOptions) const
{
    OGRwkbExportOptions sOptions(psOptions ? *psOptions
                                           : OGRwkbExportOptions());

    // Does not make sense for new geometries, so patch it.
    if (sOptions.eWkbVariant == wkbVariantOldOgc)
        sOptions.eWkbVariant = wkbVariantIso;
    return oCC.exportToWkb(this, pabyData, &sOptions);
}

/************************************************************************/
/*                       addCurveDirectlyFromWkt()                      */
/************************************************************************/

OGRErr OGRCurvePolygon::addCurveDirectlyFromWkt(OGRGeometry *poSelf,
                                                OGRCurve *poCurve)
{
    OGRCurvePolygon *poCP = poSelf->toCurvePolygon();
    return poCP->addRingDirectly(poCurve);
}

/************************************************************************/
/*                           importFromWkt()                            */
/*                                                                      */
/*      Instantiate from well known text format.                        */
/************************************************************************/

OGRErr OGRCurvePolygon::importFromWkt(const char **ppszInput)

{
    return importCurveCollectionFromWkt(ppszInput,
                                        FALSE,  // bAllowEmptyComponent
                                        TRUE,   // bAllowLineString
                                        TRUE,   // bAllowCurve
                                        TRUE,   // bAllowCompoundCurve
                                        addCurveDirectlyFromWkt);
}

/************************************************************************/
/*                            exportToWkt()                             */
/************************************************************************/

std::string OGRCurvePolygon::exportToWkt(const OGRWktOptions &opts,
                                         OGRErr *err) const
{
    return oCC.exportToWkt(this, opts, err);
}

/************************************************************************/
/*                           CurvePolyToPoly()                          */
/************************************************************************/

/**
 * \brief Return a polygon from a curve polygon.
 *
 * This method is the same as C function OGR_G_CurvePolyToPoly().
 *
 * The returned geometry is a new instance whose ownership belongs to
 * the caller.
 *
 * @param dfMaxAngleStepSizeDegrees the largest step in degrees along the
 * arc, zero to use the default setting.
 * @param papszOptions options as a null-terminated list of strings.
 *                     Unused for now. Must be set to NULL.
 *
 * @return a linestring
 */

OGRPolygon *
OGRCurvePolygon::CurvePolyToPoly(double dfMaxAngleStepSizeDegrees,
                                 const char *const *papszOptions) const
{
    OGRPolygon *poPoly = new OGRPolygon();
    poPoly->assignSpatialReference(getSpatialReference());
    for (int iRing = 0; iRing < oCC.nCurveCount; iRing++)
    {
        OGRLineString *poLS = oCC.papoCurves[iRing]->CurveToLine(
            dfMaxAngleStepSizeDegrees, papszOptions);
        OGRLinearRing *poRing = OGRCurve::CastToLinearRing(poLS);
        if (poRing == nullptr)
        {
            CPLError(CE_Failure, CPLE_IllegalArg,
                     "OGRCurve::CastToLinearRing failed");
            break;
        }
        poPoly->addRingDirectly(poRing);
    }
    return poPoly;
}

/************************************************************************/
/*                         hasCurveGeometry()                           */
/************************************************************************/

OGRBoolean OGRCurvePolygon::hasCurveGeometry(int bLookForNonLinear) const
{
    if (bLookForNonLinear)
    {
        return oCC.hasCurveGeometry(bLookForNonLinear);
    }

    return TRUE;
}

/************************************************************************/
/*                         getLinearGeometry()                        */
/************************************************************************/

OGRGeometry *
OGRCurvePolygon::getLinearGeometry(double dfMaxAngleStepSizeDegrees,
                                   const char *const *papszOptions) const
{
    return CurvePolyToPoly(dfMaxAngleStepSizeDegrees, papszOptions);
}

/************************************************************************/
/*                            getEnvelope()                             */
/************************************************************************/

void OGRCurvePolygon::getEnvelope(OGREnvelope *psEnvelope) const

{
    oCC.getEnvelope(psEnvelope);
}

/************************************************************************/
/*                            getEnvelope()                             */
/************************************************************************/

void OGRCurvePolygon::getEnvelope(OGREnvelope3D *psEnvelope) const

{
    oCC.getEnvelope(psEnvelope);
}

/************************************************************************/
/*                               Equals()                               */
/************************************************************************/

OGRBoolean OGRCurvePolygon::Equals(const OGRGeometry *poOther) const

{
    if (poOther == this)
        return TRUE;

    if (poOther->getGeometryType() != getGeometryType())
        return FALSE;

    if (IsEmpty() && poOther->IsEmpty())
        return TRUE;

    return oCC.Equals(&(poOther->toCurvePolygon()->oCC));
}

/************************************************************************/
/*                             transform()                              */
/************************************************************************/

OGRErr OGRCurvePolygon::transform(OGRCoordinateTransformation *poCT)

{
    return oCC.transform(this, poCT);
}

/************************************************************************/
/*                              get_Length()                            */
/************************************************************************/

double OGRCurvePolygon::get_Length() const

{
    double dfLength = 0.0;
    for (const auto &poCurve : *this)
    {
        dfLength += poCurve->get_Length();
    }

    return dfLength;
}

/************************************************************************/
/*                        get_GeodesicLength()                          */
/************************************************************************/

double OGRCurvePolygon::get_GeodesicLength(
    const OGRSpatialReference *poSRSOverride) const

{
    if (!poSRSOverride)
        poSRSOverride = getSpatialReference();

    double dfLength = 0.0;
    for (const auto &poCurve : *this)
    {
        const double dfLocalLength = poCurve->get_GeodesicLength(poSRSOverride);
        if (dfLocalLength < 0)
            return dfLocalLength;
        dfLength += dfLocalLength;
    }

    return dfLength;
}

/************************************************************************/
/*                              get_Area()                              */
/************************************************************************/

double OGRCurvePolygon::get_Area() const

{
    if (getExteriorRingCurve() == nullptr)
        return 0.0;

    double dfArea = getExteriorRingCurve()->get_Area();

    for (int iRing = 0; iRing < getNumInteriorRings(); iRing++)
    {
        dfArea -= getInteriorRingCurve(iRing)->get_Area();
    }

    return dfArea;
}

/************************************************************************/
/*                        get_GeodesicArea()                            */
/************************************************************************/

double OGRCurvePolygon::get_GeodesicArea(
    const OGRSpatialReference *poSRSOverride) const

{
    if (getExteriorRingCurve() == nullptr)
        return 0.0;

    if (!poSRSOverride)
        poSRSOverride = getSpatialReference();

    double dfArea = getExteriorRingCurve()->get_GeodesicArea(poSRSOverride);
    if (dfArea > 0)
    {
        for (int iRing = 0; iRing < getNumInteriorRings(); iRing++)
        {
            dfArea -=
                getInteriorRingCurve(iRing)->get_GeodesicArea(poSRSOverride);
        }
    }

    return dfArea;
}

/************************************************************************/
/*                       setCoordinateDimension()                       */
/************************************************************************/

bool OGRCurvePolygon::setCoordinateDimension(int nNewDimension)

{
    return oCC.setCoordinateDimension(this, nNewDimension);
}

bool OGRCurvePolygon::set3D(OGRBoolean bIs3D)
{
    return oCC.set3D(this, bIs3D);
}

bool OGRCurvePolygon::setMeasured(OGRBoolean bIsMeasured)
{
    return oCC.setMeasured(this, bIsMeasured);
}

/************************************************************************/
/*                       assignSpatialReference()                       */
/************************************************************************/

void OGRCurvePolygon::assignSpatialReference(const OGRSpatialReference *poSR)
{
    oCC.assignSpatialReference(this, poSR);
}

/************************************************************************/
/*                               IsEmpty()                              */
/************************************************************************/

OGRBoolean OGRCurvePolygon::IsEmpty() const
{
    return oCC.IsEmpty();
}

/************************************************************************/
/*                              segmentize()                            */
/************************************************************************/

bool OGRCurvePolygon::segmentize(double dfMaxLength)
{
    if (EQUAL(getGeometryName(), "TRIANGLE"))
    {
        CPLError(CE_Failure, CPLE_NotSupported,
                 "segmentize() is not valid for Triangle");
        return false;
    }
    return oCC.segmentize(dfMaxLength);
}

/************************************************************************/
/*                               swapXY()                               */
/************************************************************************/

void OGRCurvePolygon::swapXY()
{
    oCC.swapXY();
}

/************************************************************************/
/*                           ContainsPoint()                             */
/************************************************************************/

OGRBoolean OGRCurvePolygon::ContainsPoint(const OGRPoint *p) const
{
    if (getExteriorRingCurve() != nullptr && getNumInteriorRings() == 0)
    {
        const int nRet = getExteriorRingCurve()->ContainsPoint(p);
        if (nRet >= 0)
            return nRet;
    }

    return OGRGeometry::Contains(p);
}

/************************************************************************/
/*                          IntersectsPoint()                           */
/************************************************************************/

OGRBoolean OGRCurvePolygon::IntersectsPoint(const OGRPoint *p) const
{
    if (getExteriorRingCurve() != nullptr && getNumInteriorRings() == 0)
    {
        const int nRet = getExteriorRingCurve()->IntersectsPoint(p);
        if (nRet >= 0)
            return nRet;
    }

    return OGRGeometry::Intersects(p);
}

/************************************************************************/
/*                               Contains()                             */
/************************************************************************/

OGRBoolean OGRCurvePolygon::Contains(const OGRGeometry *poOtherGeom) const

{
    if (!IsEmpty() && poOtherGeom != nullptr &&
        wkbFlatten(poOtherGeom->getGeometryType()) == wkbPoint)
    {
        return ContainsPoint(poOtherGeom->toPoint());
    }

    return OGRGeometry::Contains(poOtherGeom);
}

/************************************************************************/
/*                              Intersects()                            */
/************************************************************************/

OGRBoolean OGRCurvePolygon::Intersects(const OGRGeometry *poOtherGeom) const

{
    if (!IsEmpty() && poOtherGeom != nullptr &&
        wkbFlatten(poOtherGeom->getGeometryType()) == wkbPoint)
    {
        return IntersectsPoint(poOtherGeom->toPoint());
    }

    return OGRGeometry::Intersects(poOtherGeom);
}

/************************************************************************/
/*                           CastToPolygon()                            */
/************************************************************************/

/**
 * \brief Convert to polygon.
 *
 * This method should only be called if the curve polygon actually only contains
 * instances of OGRLineString. This can be verified if hasCurveGeometry(TRUE)
 * returns FALSE. It is not intended to approximate curve polygons. For that
 * use getLinearGeometry().
 *
 * The passed in geometry is consumed and a new one returned (or NULL in case
 * of failure).
 *
 * @param poCP the input geometry - ownership is passed to the method.
 * @return new geometry.
 */

OGRPolygon *OGRCurvePolygon::CastToPolygon(OGRCurvePolygon *poCP)
{
    for (int i = 0; i < poCP->oCC.nCurveCount; i++)
    {
        poCP->oCC.papoCurves[i] =
            OGRCurve::CastToLinearRing(poCP->oCC.papoCurves[i]);
        if (poCP->oCC.papoCurves[i] == nullptr)
        {
            delete poCP;
            return nullptr;
        }
    }
    OGRPolygon *poPoly = new OGRPolygon();
    poPoly->setCoordinateDimension(poCP->getCoordinateDimension());
    poPoly->assignSpatialReference(poCP->getSpatialReference());
    poPoly->oCC.nCurveCount = poCP->oCC.nCurveCount;
    poPoly->oCC.papoCurves = poCP->oCC.papoCurves;
    poCP->oCC.nCurveCount = 0;
    poCP->oCC.papoCurves = nullptr;
    delete poCP;
    return poPoly;
}

//! @cond Doxygen_Suppress
/************************************************************************/
/*                      GetCasterToPolygon()                            */
/************************************************************************/

OGRPolygon *OGRCurvePolygon::CasterToPolygon(OGRSurface *poSurface)
{
    OGRCurvePolygon *poCurvePoly = poSurface->toCurvePolygon();
    return OGRCurvePolygon::CastToPolygon(poCurvePoly);
}

OGRSurfaceCasterToPolygon OGRCurvePolygon::GetCasterToPolygon() const
{
    return OGRCurvePolygon::CasterToPolygon;
}

/************************************************************************/
/*                      GetCasterToCurvePolygon()                       */
/************************************************************************/

static OGRCurvePolygon *CasterToCurvePolygon(OGRSurface *poSurface)
{
    return poSurface->toCurvePolygon();
}

OGRSurfaceCasterToCurvePolygon OGRCurvePolygon::GetCasterToCurvePolygon() const
{
    return ::CasterToCurvePolygon;
}

//! @endcond

/************************************************************************/
/*                           hasEmptyParts()                            */
/************************************************************************/

bool OGRCurvePolygon::hasEmptyParts() const
{
    return oCC.hasEmptyParts();
}

/************************************************************************/
/*                          removeEmptyParts()                          */
/************************************************************************/

void OGRCurvePolygon::removeEmptyParts()
{
    auto poExteriorRing = getExteriorRingCurve();
    if (poExteriorRing && poExteriorRing->IsEmpty())
        empty();
    else
        oCC.removeEmptyParts();
}