code: public String[] getSelectors(final int level) {
          if (level >= this.levelCounter) {
              throw new IllegalArgumentException(
                      "Cannot return current selection: max level is " + this.levelCounter + " (specified: " + level + ")");
          }
          if (this.levels == null) {
              return null;
          }
          return this.levels[level].selectors;
      }
docs: <p>
  Returns all the selectors (not only the matching ones) active for a specific <em>selection level</em>, ie
  for a specific instance of {@link org.attoparser.select.BlockSelectorMarkupHandler} or
  {@link org.attoparser.select.NodeSelectorMarkupHandler} at the handler chain.
  </p>
  
  @param level the selection level.
  @return all the selectors active for that level (not only the matching ones).