code: @Override
  	public void addZoomLevelProgress(int zoomLevel, int progress) {
  		Integer zoomProgress = getZoomLevelProgress(zoomLevel);
  		zoomProgress += progress;
  		zoomLevelProgress.put(zoomLevel, zoomProgress);
  		if (currentZoom > -1 && currentZoom != zoomLevel) {
  			LOGGER.log(Level.INFO, title + " - Finished Zoom Level "
  					+ currentZoom + ", Tiles: "
  					+ getZoomLevelProgress(currentZoom));
  		}
  		currentZoom = zoomLevel;
  	}
docs: {@inheritDoc}