code: @Override
  	public BoundingBox getBoundingBox() {
  		List<Double> values = querySingleRowTypedResults(
  				"SELECT MIN(" + RTreeIndexExtension.COLUMN_MIN_X + "), MIN("
  						+ RTreeIndexExtension.COLUMN_MIN_Y + "), MAX("
  						+ RTreeIndexExtension.COLUMN_MAX_X + "), MAX("
  						+ RTreeIndexExtension.COLUMN_MAX_Y + ") FROM "
  						+ CoreSQLUtils.quoteWrap(getTableName()), null);
  		BoundingBox boundingBox = new BoundingBox(values.get(0), values.get(1),
  				values.get(2), values.get(3));
  		return boundingBox;
  	}
docs: {@inheritDoc}