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() : mCurrentIndex(0) {}
  17
  18 ResultSet::~ResultSet() { mData.Clear(); }
  19
  20 nsresult ResultSet::add(mozIStorageRow* aRow) {
  21   return mData.AppendObject(aRow) ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
  22 }
  23
  24 /**
  25  * Note:  This object is only ever accessed on one thread at a time.  It it not
  26  *        threadsafe, but it does need threadsafe AddRef and Release.
  27  */
  28 NS_IMPL_ISUPPORTS(ResultSet, mozIStorageResultSet)
  29
  30 ////////////////////////////////////////////////////////////////////////////////
  31 //// mozIStorageResultSet
  32
  33 NS_IMETHODIMP
  34 ResultSet::GetNextRow(mozIStorageRow** _row) {
  35   NS_ENSURE_ARG_POINTER(_row);
  36
  37   if (mCurrentIndex >= mData.Count()) {
  38     // Just return null here
  39     return NS_OK;
  40   }
  41
  42   NS_ADDREF(*_row = mData.ObjectAt(mCurrentIndex++));
  43   return NS_OK;
  44 }
  45
  46 }  // namespace storage
  47 }  // namespace mozilla