docs: public List<JavaComment> javaDocOnly(final List<JavaComment> originals) {
          final List<JavaComment> results = new ArrayList<JavaComment>(
                  originals.size());
          for (JavaComment comment : originals) {
              comment._switch(new JavaComment.SwitchBlockWithDefault() {
                  
                  @Override
                  public void _case(JavaDocComment x) {
                      results.add(x);
                  }
  
                  @Override
                  protected void _default(JavaComment x) {
                      // do nothing, we only want to add javadocs
                  }
              });
          }
          return results;
      }