lwt_LoadTopology()

LWT_TOPOLOGY* lwt_LoadTopology	(	LWT_BE_IFACE *	iface,
		const char *	name
	)

Loads an existing topology by name from the database.

Parameters

iface	the backend interface handler (see lwt_CreateBackendIface)
name	name of the topology to load

Returns

the handler of the topology, or NULL on error (liblwgeom error handler will be invoked with error message)

Definition at line 497 of file lwgeom_topo.c.

{
  LWT_BE_TOPOLOGY* be_topo;
  LWT_TOPOLOGY* topo;
 
  be_topo = lwt_be_loadTopologyByName(iface, name);
  if ( ! be_topo ) {
    //lwerror("Could not load topology from backend: %s",
    lwerror("%s", lwt_be_lastErrorMessage(iface));
    return NULL;
  }
  topo = lwalloc(sizeof(LWT_TOPOLOGY));
  topo->be_iface = iface;
  topo->be_topo = be_topo;
  topo->srid = lwt_be_topoGetSRID(topo);
  topo->hasZ = lwt_be_topoHasZ(topo);
  topo->precision = lwt_be_topoGetPrecision(topo);
 
  return topo;
}

References LWT_TOPOLOGY_T::be_iface, LWT_TOPOLOGY_T::be_topo, LWT_TOPOLOGY_T::hasZ, lwalloc(), lwerror(), lwt_be_lastErrorMessage(), lwt_be_loadTopologyByName(), lwt_be_topoGetPrecision(), lwt_be_topoGetSRID(), lwt_be_topoHasZ(), LWT_TOPOLOGY_T::precision, and LWT_TOPOLOGY_T::srid.

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