storage/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  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozStorageRow.h"
   8 #include "mozStorageResultSet.h"
   9
  10 namespace mozilla {
  11 namespace storage {
  12
  13 ////////////////////////////////////////////////////////////////////////////////
  14 //// ResultSet
  15
  16 ResultSet::ResultSet()
  17 : mCurrentIndex(0)
  18 {
  19 }
  20
  21 ResultSet::~ResultSet()
  22 {
  23   mData.Clear();
  24 }
  25
  26 nsresult
  27 ResultSet::add(mozIStorageRow *aRow)
  28 {
  29   return mData.AppendObject(aRow) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
  30 }
  31
  32 /**
  33  * Note:  This object is only ever accessed on one thread at a time.  It it not
  34  *        threadsafe, but it does need threadsafe AddRef and Release.
  35  */
  36 NS_IMPL_ISUPPORTS(
  37   ResultSet,
  38   mozIStorageResultSet
  39 )
  40
  41 ////////////////////////////////////////////////////////////////////////////////
  42 //// mozIStorageResultSet
  43
  44 NS_IMETHODIMP
  45 ResultSet::GetNextRow(mozIStorageRow **_row)
  46 {
  47   NS_ENSURE_ARG_POINTER(_row);
  48
  49   if (mCurrentIndex >= mData.Count()) {
  50     // Just return null here
  51     return NS_OK;
  52   }
  53
  54   NS_ADDREF(*_row = mData.ObjectAt(mCurrentIndex++));
  55   return NS_OK;
  56 }
  57
  58 } // namespace storage
  59 } // namespace mozilla