code: public String[] getLayerIds() {
  		Set<String> layerIds = layerFilters.keySet();
  		if (layerIds == null) {
  			return new String[0];
  		}
  		return layerIds.toArray(new String[layerIds.size()]);
  	}
docs: Get the result tags for layer specific filtering (e.g. client layer id's).
  
  @return result tags for layer specific filtering (e.g. client layer id's)
  @since 1.10.0