LWGEOM_force_collection()

Datum LWGEOM_force_collection

(

PG_FUNCTION_ARGS

)

Definition at line 459 of file lwgeom_functions_basic.c.

{
        GSERIALIZED *geom = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *result;
        LWGEOM **lwgeoms;
        LWGEOM *lwgeom;
        int32_t srid;
        GBOX *bbox;
 
        POSTGIS_DEBUG(2, "LWGEOM_force_collection called");
 
        /*
         * This funx is a no-op only if a bbox cache is already present
         * in input. If bbox cache is not there we'll need to handle
         * automatic bbox addition FOR_COMPLEX_GEOMS.
         */
        if (gserialized_get_type(geom) == COLLECTIONTYPE && gserialized_has_bbox(geom))
        {
                PG_RETURN_POINTER(geom);
        }
 
        /* deserialize into lwgeoms[0] */
        lwgeom = lwgeom_from_gserialized(geom);
 
        /* already a multi*, just make it a collection */
        if (lwgeom_is_collection(lwgeom))
        {
                lwgeom->type = COLLECTIONTYPE;
        }
 
        /* single geom, make it a collection */
        else
        {
                srid = lwgeom->srid;
                /* We transfer bbox ownership from input to output */
                bbox = lwgeom->bbox;
                lwgeom->srid = SRID_UNKNOWN;
                lwgeom->bbox = NULL;
                lwgeoms = palloc(sizeof(LWGEOM *));
                lwgeoms[0] = lwgeom;
                lwgeom = (LWGEOM *)lwcollection_construct(COLLECTIONTYPE, srid, bbox, 1, lwgeoms);
        }
 
        result = geometry_serialize(lwgeom);
        lwgeom_free(lwgeom);
 
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_POINTER(result);
}

References LWGEOM::bbox, COLLECTIONTYPE, gserialized_get_type(), gserialized_has_bbox(), lwcollection_construct(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_is_collection(), result, LWGEOM::srid, SRID_UNKNOWN, and LWGEOM::type.

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