lwcollection_add_lwgeom()

LWCOLLECTION * lwcollection_add_lwgeom	(	LWCOLLECTION *	col,
		const LWGEOM *	geom
	)

Appends geom to the collection managed by col.

Does not copy or clone, simply takes a reference on the passed geom.

Definition at line 189 of file lwcollection.c.

{
        if (!col || !geom) return NULL;
 
        if (!col->geoms && (col->ngeoms || col->maxgeoms))
        {
                lwerror("Collection is in inconsistent state. Null memory but non-zero collection counts.");
                return NULL;
        }
 
        /* Check type compatibility */
        if ( ! lwcollection_allows_subtype(col->type, geom->type) ) {
                lwerror("%s cannot contain %s element", lwtype_name(col->type), lwtype_name(geom->type));
                return NULL;
        }
 
        /* In case this is a truly empty, make some initial space  */
        if (!col->geoms)
        {
                col->maxgeoms = 2;
                col->ngeoms = 0;
                col->geoms = lwalloc(col->maxgeoms * sizeof(LWGEOM*));
        }
 
        /* Allocate more space if we need it */
        lwcollection_reserve(col, col->ngeoms + 1);
 
#ifndef NDEBUG
        /* See http://trac.osgeo.org/postgis/ticket/2933 */
        /* Make sure we don't already have a reference to this geom */
        {
                for (uint32_t i = 0; i < col->ngeoms; i++)
                {
                        if (col->geoms[i] == geom)
                        {
                                lwerror("%s [%d] found duplicate geometry in collection %p == %p", __FILE__, __LINE__, col->geoms[i], geom);
                                return col;
                        }
                }
        }
#endif
 
        col->geoms[col->ngeoms] = (LWGEOM*)geom;
        col->ngeoms++;
        return col;
}

References LWCOLLECTION::geoms, lwalloc(), lwcollection_allows_subtype(), lwcollection_reserve(), lwerror(), lwtype_name(), LWCOLLECTION::maxgeoms, LWCOLLECTION::ngeoms, LWGEOM::type, and LWCOLLECTION::type.

Referenced by lwcollection_build_buffer(), lwcollection_chaikin(), lwcollection_concat_in_place(), lwcollection_extract_recursive(), lwcollection_filterm(), lwcollection_from_twkb_state(), lwcollection_from_wkb_state(), lwcollection_homogenize(), lwcollection_offsetcurve(), lwcollection_set_effective_area(), lwcompound_add_lwgeom(), lwgeom_boundary(), lwgeom_clip_to_ordinate_range(), lwgeom_segmentize_sphere(), lwgeom_subdivide_recursive(), lwline_clip_to_ordinate_range(), lwmline_add_lwline(), lwmpoint_add_lwpoint(), lwmpoint_clip_to_ordinate_range(), lwmpoly_add_lwpoly(), lwmultiline_from_twkb_state(), lwmultipoint_from_twkb_state(), lwmultipoly_from_twkb_state(), lwpoint_clip_to_ordinate_range(), lwpoly_clip_to_ordinate_range(), lwpsurface_add_lwpoly(), lwtin_add_lwtriangle(), lwtriangle_clip_to_ordinate_range(), parse_geojson_geometrycollection(), parse_gml_coll(), parse_kml_multi(), parse_marc21(), pta_unstroke(), rect_tree_to_lwgeom(), TWKBFromLWGEOMArray(), and wkt_parser_collection_add_geom().

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