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71 lines
2.8 KiB
Plaintext
71 lines
2.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Storage Code.
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*
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* The Initial Developer of the Original Code is
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* Lev Serebryakov <lev@serebryakov.spb.ru>
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* Portions created by the Initial Developer are Copyright (C) 2007
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface mozIStorageConnection;
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interface mozIStorageValueArray;
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interface nsIArray;
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interface nsIVariant;
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/**
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* mozIStorageAggregateFunction represents aggregate SQL function.
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* Common examples of aggregate functions are SUM() and COUNT().
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*
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* An aggregate function calculates one result for a given set of data, where
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* a set of data is a group of tuples. There can be one group
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* per request or many of them, if GROUP BY clause is used or not.
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*/
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[scriptable, uuid(763217b7-3123-11da-918d-000347412e16)]
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interface mozIStorageAggregateFunction : nsISupports {
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/**
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* onStep is called when next value should be passed to
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* a custom function.
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*
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* @param aFunctionArguments The arguments passed in to the function
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*/
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void onStep(in mozIStorageValueArray aFunctionArguments);
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/**
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* Called when all tuples in a group have been processed and the engine
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* needs the aggregate function's value.
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*
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* @returns aggregate result as Variant.
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*/
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nsIVariant onFinal();
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};
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