lwgeom_homogenize()

LWGEOM* lwgeom_homogenize

(

const LWGEOM *

geom

)

Definition at line 209 of file lwhomogenize.c.

References LWGEOM::bbox, CIRCSTRINGTYPE, COLLECTIONTYPE, COMPOUNDTYPE, CURVEPOLYTYPE, gbox_copy(), LWCOLLECTION::geoms, LINETYPE, lwcollection_as_lwgeom(), lwcollection_construct_empty(), lwcollection_homogenize(), lwerror(), lwgeom_clone(), lwgeom_has_m(), lwgeom_has_z(), lwgeom_is_collection(), lwgeom_is_empty(), lwtype_name(), MULTICURVETYPE, MULTILINETYPE, MULTIPOINTTYPE, MULTIPOLYGONTYPE, MULTISURFACETYPE, LWCOLLECTION::ngeoms, POINTTYPE, POLYGONTYPE, POLYHEDRALSURFACETYPE, LWGEOM::srid, TINTYPE, TRIANGLETYPE, and LWGEOM::type.

Referenced by do_geom_test(), geom_from_kml(), and ST_CollectionHomogenize().

{
        LWGEOM *hgeom;

        /* EMPTY Geometry */
        if (lwgeom_is_empty(geom))
        {
                if( lwgeom_is_collection(geom) )
                {
                        return lwcollection_as_lwgeom(lwcollection_construct_empty(geom->type, geom->srid, lwgeom_has_z(geom), lwgeom_has_m(geom)));
                }

                return lwgeom_clone(geom);
        }

        switch (geom->type)
        {

                /* Return simple geometries untouched */
                case POINTTYPE:
                case LINETYPE:
                case CIRCSTRINGTYPE:
                case COMPOUNDTYPE:
                case TRIANGLETYPE:
                case CURVEPOLYTYPE:
                case POLYGONTYPE:
                        return lwgeom_clone(geom);

                /* Process homogeneous geometries lightly */
                case MULTIPOINTTYPE:
                case MULTILINETYPE:
                case MULTIPOLYGONTYPE:
                case MULTICURVETYPE:
                case MULTISURFACETYPE:
                case POLYHEDRALSURFACETYPE:
                case TINTYPE:
                {
                        LWCOLLECTION *col = (LWCOLLECTION*)geom;

                        /* Strip single-entry multi-geometries down to singletons */
                        if ( col->ngeoms == 1 )
                        {
                                hgeom = lwgeom_clone((LWGEOM*)(col->geoms[0]));
                                hgeom->srid = geom->srid;
                                if (geom->bbox)
                                        hgeom->bbox = gbox_copy(geom->bbox);
                                return hgeom;
                        }

                        /* Return proper multigeometry untouched */
                        return lwgeom_clone(geom);
                }

                /* Work on anonymous collections separately */
                case COLLECTIONTYPE:
                        return lwcollection_homogenize((LWCOLLECTION *) geom);
        }

        /* Unknown type */
        lwerror("lwgeom_homogenize: Geometry Type not supported (%i)",
                lwtype_name(geom->type));

        return NULL; /* Never get here! */
}

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