_lwt_EdgeSplit()

static LWCOLLECTION* _lwt_EdgeSplit ( LWT_TOPOLOGY *  topo, LWT_ELEMID  edge, LWPOINT *  pt, int  skipISOChecks, LWT_ISO_EDGE **  oldedge  )

static

Definition at line 935 of file lwgeom_topo.c.

{
  LWGEOM *split;
  LWCOLLECTION *split_col;
  int i;
 
  /* Get edge */
  i = 1;
  LWDEBUG(1, "calling lwt_be_getEdgeById");
  *oldedge = lwt_be_getEdgeById(topo, &edge, &i, LWT_COL_EDGE_ALL);
  LWDEBUGF(1, "lwt_be_getEdgeById returned %p", *oldedge);
  if ( ! *oldedge )
  {
    LWDEBUGF(1, "lwt_be_getEdgeById returned NULL and set i=%d", i);
    if ( i == -1 )
    {
      lwerror("Backend error: %s", lwt_be_lastErrorMessage(topo->be_iface));
      return NULL;
    }
    else if ( i == 0 )
    {
      lwerror("SQL/MM Spatial exception - non-existent edge");
      return NULL;
    }
    else
    {
      lwerror("Backend coding error: getEdgeById callback returned NULL "
              "but numelements output parameter has value %d "
              "(expected 0 or 1)", i);
      return NULL;
    }
  }
 
 
  /*
   *  - check if a coincident node already exists
   */
  if ( ! skipISOChecks )
  {
    LWDEBUG(1, "calling lwt_be_ExistsCoincidentNode");
    if ( lwt_be_ExistsCoincidentNode(topo, pt) ) /*x*/
    {
      LWDEBUG(1, "lwt_be_ExistsCoincidentNode returned");
      _lwt_release_edges(*oldedge, 1);
      lwerror("SQL/MM Spatial exception - coincident node");
      return NULL;
    }
    LWDEBUG(1, "lwt_be_ExistsCoincidentNode returned");
  }
 
  /* Split edge */
  split = lwgeom_split((LWGEOM*)(*oldedge)->geom, (LWGEOM*)pt);
  if ( ! split )
  {
    _lwt_release_edges(*oldedge, 1);
    lwerror("could not split edge by point ?");
    return NULL;
  }
  split_col = lwgeom_as_lwcollection(split);
  if ( ! split_col ) {
    _lwt_release_edges(*oldedge, 1);
    lwgeom_free(split);
    lwerror("lwgeom_as_lwcollection returned NULL");
    return NULL;
  }
  if (split_col->ngeoms < 2) {
    _lwt_release_edges(*oldedge, 1);
    lwgeom_free(split);
    lwerror("SQL/MM Spatial exception - point not on edge");
    return NULL;
  }
 
#if 0
  {
  size_t sz;
  char *wkt = lwgeom_to_wkt((LWGEOM*)split_col, WKT_EXTENDED, 2, &sz);
  LWDEBUGF(1, "returning split col: %s", wkt);
  lwfree(wkt);
  }
#endif
  return split_col;
}

References _lwt_release_edges(), LWT_TOPOLOGY_T::be_iface, LWDEBUG, LWDEBUGF, lwerror(), lwfree(), lwgeom_as_lwcollection(), lwgeom_free(), lwgeom_split(), lwgeom_to_wkt(), lwt_be_ExistsCoincidentNode(), lwt_be_getEdgeById(), lwt_be_lastErrorMessage(), LWT_COL_EDGE_ALL, LWCOLLECTION::ngeoms, and WKT_EXTENDED.

Referenced by lwt_ModEdgeSplit(), and lwt_NewEdgesSplit().

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