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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface mozIStorageConnection;
interface mozIStorageValueArray;
interface nsIArray;
interface nsIVariant;

/**
 * mozIStorageAggregateFunction represents aggregate SQL function.
 * Common examples of aggregate functions are SUM() and COUNT().
 *
 * An aggregate function calculates one result for a given set of data, where
 * a set of data is a group of tuples. There can be one group
 * per request or many of them, if GROUP BY clause is used or not.
 */
[scriptable, uuid(763217b7-3123-11da-918d-000347412e16)]
interface mozIStorageAggregateFunction : nsISupports {
  /**
   * onStep is called when next value should be passed to
   * a custom function.
   * 
   * @param aFunctionArguments    The arguments passed in to the function
   */
  void onStep(in mozIStorageValueArray aFunctionArguments);

  /**
   * Called when all tuples in a group have been processed and the engine
   * needs the aggregate function's value.
   *
   * @returns aggregate result as Variant.
   */
  nsIVariant onFinal();
};