lwcollection_extract()

LWCOLLECTION * lwcollection_extract	(	const LWCOLLECTION *	col,
		uint32_t	type
	)

Definition at line 432 of file lwcollection.c.

{
        LWCOLLECTION* outcol;
 
        if (!col) return NULL;
 
        /* Self-discover output type when it is not specified */
        if (!type)
                type = lwcollection_largest_dimension(col);
 
        /*
        * If self-discovery failed, there were no primitive points
        * lines or polygons in the collection, so send back an
        * empty collection.
        */
        if (!type)
        {
                return lwcollection_construct_empty(COLLECTIONTYPE,
                   col->srid,
                   FLAGS_GET_Z(col->flags),
                   FLAGS_GET_M(col->flags));
        }
 
        if (!(type == POINTTYPE || type == LINETYPE || type == POLYGONTYPE))
        {
                lwerror(
                    "Only POLYGON, LINESTRING and POINT are supported by "
                    "lwcollection_extract. %s requested.",
                    lwtype_name(type));
                return NULL;
        }
 
        outcol = lwcollection_construct_empty(lwtype_multitype(type),
                   col->srid,
                   FLAGS_GET_Z(col->flags),
                   FLAGS_GET_M(col->flags));
 
        lwcollection_extract_recursive(col, type, outcol);
        lwgeom_add_bbox(lwcollection_as_lwgeom(outcol));
        return outcol;
}

References COLLECTIONTYPE, LWCOLLECTION::flags, FLAGS_GET_M, FLAGS_GET_Z, LINETYPE, lwcollection_as_lwgeom(), lwcollection_construct_empty(), lwcollection_extract_recursive(), lwcollection_largest_dimension(), lwerror(), lwgeom_add_bbox(), lwtype_multitype(), lwtype_name(), POINTTYPE, POLYGONTYPE, and LWCOLLECTION::srid.

Referenced by _lwt_AddLineEdge(), lwgeom_to_basic_type(), ST_CollectionExtract(), and test_lwcollection_extract().

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