editor/txmgr/src/nsTransactionStack.cpp
author Wes Kocher <wkocher@mozilla.com>
Tue, 24 Jun 2014 18:32:55 -0700
changeset 211405 71f6b8a9b2e8cb698a495eb29d7611cb030073a9
parent 211395 editor/txmgr/nsTransactionStack.cpp@62ad3254903e92e3814652dac400f00956b0a347
child 211437 645ad2c2411421798c8e815bcd74aa8092aa066f
permissions -rw-r--r--
Backed out 6 changesets (bug 1028559, bug 1028565) for android mochitest bustage on a CLOSED TREE Backed out changeset fdd74c065e5d (bug 1028565) Backed out changeset 5e9777d38052 (bug 1028565) Backed out changeset 3510bcdba3fc (bug 1028565) Backed out changeset 62ad3254903e (bug 1028565) Backed out changeset e7557f70acfe (bug 1028565) Backed out changeset 5b1b527abe47 (bug 1028559)

/* -*- 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 "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsISupportsUtils.h"
#include "nsTransactionItem.h"
#include "nsTransactionStack.h"
#include "nscore.h"

nsTransactionStack::nsTransactionStack(nsTransactionStack::Type aType)
  : mType(aType)
{
}

nsTransactionStack::~nsTransactionStack()
{
  Clear();
}

void
nsTransactionStack::Push(nsTransactionItem *aTransaction)
{
  if (!aTransaction) {
    return;
  }

  // The stack's bottom is the front of the deque, and the top is the back.
  mDeque.push_back(aTransaction);
}

already_AddRefed<nsTransactionItem>
nsTransactionStack::Pop()
{
  if (mDeque.empty()) {
    return nullptr;
  }
  nsRefPtr<nsTransactionItem> ret = mDeque.back().forget();
  mDeque.pop_back();
  return ret.forget();
}

already_AddRefed<nsTransactionItem>
nsTransactionStack::PopBottom()
{
  if (mDeque.empty()) {
    return nullptr;
  }
  nsRefPtr<nsTransactionItem> ret = mDeque.front().forget();
  mDeque.pop_front();
  return ret.forget();
}

already_AddRefed<nsTransactionItem>
nsTransactionStack::Peek()
{
  if (mDeque.empty()) {
    return nullptr;
  }
  nsRefPtr<nsTransactionItem> ret = mDeque.back();
  return ret.forget();
}

already_AddRefed<nsTransactionItem>
nsTransactionStack::GetItem(int32_t aIndex)
{
  if (aIndex < 0 || aIndex >= static_cast<int32_t>(mDeque.size())) {
    return nullptr;
  }
  nsRefPtr<nsTransactionItem> ret = mDeque[aIndex];
  return ret.forget();
}

void
nsTransactionStack::Clear()
{
  while (!mDeque.empty()) {
    nsRefPtr<nsTransactionItem> tx = mType == FOR_UNDO ? Pop() : PopBottom();
  };
}

void
nsTransactionStack::DoTraverse(nsCycleCollectionTraversalCallback &cb)
{
  int32_t size = mDeque.size();
  for (int32_t i = 0; i < size; ++i) {
    nsTransactionItem* item = mDeque[i];
    if (item) {
      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "transaction stack mDeque[i]");
      cb.NoteNativeChild(item, NS_CYCLE_COLLECTION_PARTICIPANT(nsTransactionItem));
    }
  }
}