docs: @CheckForNull
      public static String getFullIdent(@Nonnull final DetailAST pAst)
      {
          String result = null;
          DetailAST ast = checkTokens(pAst.getFirstChild(), TokenTypes.DOT, TokenTypes.IDENT);
          if (ast != null) {
              StringBuilder sb = new StringBuilder();
              if (getFullIdentInternal(ast, sb)) {
                  result = sb.toString();
              }
          }
          return result;
      }