storage/src/mozStorageResultSet.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
   3  * ***** BEGIN LICENSE BLOCK *****
   4  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5  *
   6  * The contents of this file are subject to the Mozilla Public License Version
   7  * 1.1 (the "License"); you may not use this file except in compliance with
   8  * the License. You may obtain a copy of the License at
   9  * http://www.mozilla.org/MPL/
  10  *
  11  * Software distributed under the License is distributed on an "AS IS" basis,
  12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13  * for the specific language governing rights and limitations under the
  14  * License.
  15  *
  16  * The Original Code is mozilla.org code.
  17  *
  18  * The Initial Developer of the Original Code is
  19  * Mozilla Corporation
  20  * Portions created by the Initial Developer are Copyright (C) 2008
  21  * the Initial Developer. All Rights Reserved.
  22  *
  23  * Contributor(s):
  24  *   Shawn Wilsher <me@shawnwilsher.com> (Original Author)
  25  *
  26  * Alternatively, the contents of this file may be used under the terms of
  27  * either the GNU General Public License Version 2 or later (the "GPL"), or
  28  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  29  * in which case the provisions of the GPL or the LGPL are applicable instead
  30  * of those above. If you wish to allow use of your version of this file only
  31  * under the terms of either the GPL or the LGPL, and not to allow others to
  32  * use your version of this file under the terms of the MPL, indicate your
  33  * decision by deleting the provisions above and replace them with the notice
  34  * and other provisions required by the GPL or the LGPL. If you do not delete
  35  * the provisions above, a recipient may use your version of this file under
  36  * the terms of any one of the MPL, the GPL or the LGPL.
  37  *
  38  * ***** END LICENSE BLOCK ***** */
  39
  40 #include "mozStorageRow.h"
  41 #include "mozStorageResultSet.h"
  42
  43 namespace mozilla {
  44 namespace storage {
  45
  46 ////////////////////////////////////////////////////////////////////////////////
  47 //// ResultSet
  48
  49 ResultSet::ResultSet()
  50 : mCurrentIndex(0)
  51 {
  52 }
  53
  54 ResultSet::~ResultSet()
  55 {
  56   mData.Clear();
  57 }
  58
  59 nsresult
  60 ResultSet::add(mozIStorageRow *aRow)
  61 {
  62   return mData.AppendObject(aRow) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
  63 }
  64
  65 /**
  66  * Note:  This object is only ever accessed on one thread at a time.  It it not
  67  *        threadsafe, but it does need threadsafe AddRef and Release.
  68  */
  69 NS_IMPL_THREADSAFE_ISUPPORTS1(
  70   ResultSet,
  71   mozIStorageResultSet
  72 )
  73
  74 ////////////////////////////////////////////////////////////////////////////////
  75 //// mozIStorageResultSet
  76
  77 NS_IMETHODIMP
  78 ResultSet::GetNextRow(mozIStorageRow **_row)
  79 {
  80   NS_ENSURE_ARG_POINTER(_row);
  81
  82   if (mCurrentIndex >= mData.Count()) {
  83     // Just return null here
  84     return NS_OK;
  85   }
  86
  87   NS_ADDREF(*_row = mData.ObjectAt(mCurrentIndex++));
  88   return NS_OK;
  89 }
  90
  91 } // namespace storage
  92 } // namespace mozilla