Method parseParam

src/query/expression/Expressions.java:142–163

Helper that parses out the parameter from the expression @param param The parameter to parse @param metric_queries A list to store the parsed metrics in @param root The root tree @param data_query The time series query @param index Index of the parameter

(final String param, 
                                 final List<String> metric_queries,
                                 final ExpressionTree root, 
                                 final TSQuery data_query, 
                                 final int index)

   * @param index Index of the parameter
   */
  private static void parseParam(final String param, 
                                 final List<String> metric_queries,
                                 final ExpressionTree root, 
                                 final TSQuery data_query, 
                                 final int index) {
    if (param == null || param.length() == 0) {
      throw new IllegalArgumentException("Parameter cannot be null or empty");
    }

    if (param.indexOf('(') > 0 && param.indexOf(')') > 0) {
      // sub expression
      final ExpressionTree sub_tree = parse(param, metric_queries, data_query);
      root.addSubExpression(sub_tree, index);
    } else if (param.indexOf(':') >= 0) {
      // metric query
      metric_queries.add(param);
      root.addSubMetricQuery(param, metric_queries.size() - 1, index);
    } else {
      // expression parameter
      root.addFunctionParameter(param);
    }
  }

}