LWGEOM_numinteriorrings_polygon()

Datum LWGEOM_numinteriorrings_polygon

(

PG_FUNCTION_ARGS

)

Definition at line 542 of file lwgeom_ogc.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        LWGEOM *lwgeom = lwgeom_from_gserialized(geom);
        int type = lwgeom->type;
        int result = -1;
 
        if ( !lwgeom_has_rings(lwgeom) )
                PG_RETURN_NULL();
 
        if ( lwgeom_is_empty(lwgeom) || type == TRIANGLETYPE )
                PG_RETURN_INT32(0);
 
        /*
         * POLYGON and TRIANGLE have same underlying structure
         * with an array of nrings rings of POINTARRAY holding the
         * rings
         */
        if (type == POLYGONTYPE )
        {
                const LWPOLY *poly = lwgeom_as_lwpoly(lwgeom);
                result = poly->nrings - 1;
        }
        /*
         * CURVEPOLYGON on the other hand is structured
         * like a collection with each ring represented by
         * a geometry in a list ngeoms long.
         */
        else if (type == CURVEPOLYTYPE)
        {
                const LWCURVEPOLY *curv = lwgeom_as_lwcurvepoly(lwgeom);
                result = curv->nrings - 1;
        }
        /*
         * If a new type is added to the zoo, we should error
         * out.
         */
        else
        {
                elog(ERROR, "%s unsupported ring type %d", __func__, type);
        }
 
        lwgeom_free(lwgeom);
        PG_FREE_IF_COPY(geom, 0);
        if ( result < 0 )
                PG_RETURN_NULL();
        else
                PG_RETURN_INT32(result);
}

References CURVEPOLYTYPE, lwgeom_as_lwcurvepoly(), lwgeom_as_lwpoly(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_has_rings(), lwgeom_is_empty(), LWPOLY::nrings, LWCURVEPOLY::nrings, POLYGONTYPE, result, TRIANGLETYPE, and LWGEOM::type.

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