Function msQueryByFilter

mapquery.c:765–941

** Query using common expression syntax. */

** Query using common expression syntax.
*/
int msQueryByFilter(mapObj *map)
{
  int l;
  int start, stop=0;

  layerObj *lp;

  char status;
  
  expressionObj old_filter;

  rectObj search_rect;

  shapeObj shape;
  
  int nclasses = 0;
  int *classgroup = NULL;
  double minfeaturesize = -1;

  if(map->query.type != MS_QUERY_BY_FILTER) {
    msSetError(MS_QUERYERR, "The query is not properly defined.", "msQueryByFilter()");
    return(MS_FAILURE);
  }
  if(!map->query.filter) { // TODO: check filter type too
    msSetError(MS_QUERYERR, "Filter is not set.", "msQueryByFilter()");
    return(MS_FAILURE);
  }
  
  msInitShape(&shape);

  if(map->query.layer < 0 || map->query.layer >= map->numlayers)
    start = map->numlayers-1;
  else
    start = stop = map->query.layer;

  for(l=start; l>=stop; l--) {
    lp = (GET_LAYER(map, l));

    /* conditions may have changed since this layer last drawn, so set 
       layer->project true to recheck projection needs (Bug #673) */ 
    lp->project = MS_TRUE; 

    /* free any previous search results, do it now in case one of the next few tests fail */
    if(lp->resultcache) {
      if(lp->resultcache->results) free(lp->resultcache->results);
      free(lp->resultcache);
      lp->resultcache = NULL;
    }

    if(!msIsLayerQueryable(lp)) continue;
    if(lp->status == MS_OFF) continue;
    if(lp->type == MS_LAYER_RASTER) continue; /* ok to skip? */

    if(map->scaledenom > 0) {
      if((lp->maxscaledenom > 0) && (map->scaledenom > lp->maxscaledenom)) continue;
      if((lp->minscaledenom > 0) && (map->scaledenom <= lp->minscaledenom)) continue;
    }