lwt_RemoveIsoNode()

int lwt_RemoveIsoNode	(	LWT_TOPOLOGY *	topo,
		LWT_ELEMID	node
	)

Remove an isolated node.

For ST_RemoveIsoNode

Parameters

topo	the topology to operate on
node	the identifier of the node to be moved

Returns

0 on success, -1 on error (liblwgeom error handler will be invoked with error message)

Definition at line 3777 of file lwgeom_topo.c.

{
  LWT_ISO_NODE *node;
  int n = 1;
 
  node = _lwt_GetIsoNode( topo, nid );
  if ( ! node ) return -1;
 
  n = lwt_be_deleteNodesById( topo, &nid, n );
  if ( n == -1 )
  {
    lwfree(node);
    lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
  if ( n != 1 )
  {
    lwfree(node);
    lwerror("Unexpected error: %d nodes deleted when expecting 1", n);
    return -1;
  }
 
  if ( ! lwt_be_checkTopoGeomRemIsoNode(topo, nid) )
  {
    lwfree(node);
    lwerror("%s", lwt_be_lastErrorMessage(topo->be_iface));
    return -1;
  }
 
  lwfree(node);
  return 0; /* success */
}

References _lwt_GetIsoNode(), LWT_TOPOLOGY_T::be_iface, lwerror(), lwfree(), lwt_be_checkTopoGeomRemIsoNode(), lwt_be_deleteNodesById(), and lwt_be_lastErrorMessage().

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