gecko/dom/indexedDB/IDBWrapperCache.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "IDBWrapperCache.h"
#include "nsContentUtils.h"

USING_INDEXEDDB_NAMESPACE

NS_IMPL_CYCLE_COLLECTION_CLASS(IDBWrapperCache)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(IDBWrapperCache,
                                                  nsDOMEventTargetHelper)
  // Don't need NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS because
  // nsDOMEventTargetHelper does it for us.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(IDBWrapperCache,
                                                nsDOMEventTargetHelper)
  if (tmp->mScriptOwner) {
    NS_DROP_JS_OBJECTS(tmp, IDBWrapperCache);
    tmp->mScriptOwner = nsnull;
  }
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(IDBWrapperCache,
                                               nsDOMEventTargetHelper)
  // Don't need NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER because
  // nsDOMEventTargetHelper does it for us.
  if (tmp->mScriptOwner) {
    NS_IMPL_CYCLE_COLLECTION_TRACE_JS_CALLBACK(tmp->mScriptOwner,
                                               "mScriptOwner")
  }
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(IDBWrapperCache)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(IDBWrapperCache, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(IDBWrapperCache, nsDOMEventTargetHelper)

IDBWrapperCache::~IDBWrapperCache()
{
  if (mScriptOwner) {
    NS_DROP_JS_OBJECTS(this, IDBWrapperCache);
  }
}

bool
IDBWrapperCache::SetScriptOwner(JSObject* aScriptOwner)
{
  if (!aScriptOwner) {
    NS_ASSERTION(!mScriptOwner,
                 "Don't null out existing owner, we need to call "
                 "DropJSObjects!");

    return true;
  }

  mScriptOwner = aScriptOwner;

  nsISupports* thisSupports = NS_CYCLE_COLLECTION_UPCAST(this, IDBWrapperCache);
  nsXPCOMCycleCollectionParticipant* participant;
  CallQueryInterface(this, &participant);
  nsresult rv = nsContentUtils::HoldJSObjects(thisSupports, participant);
  if (NS_FAILED(rv)) {
    NS_WARNING("nsContentUtils::HoldJSObjects failed.");
    mScriptOwner = nsnull;
    return false;
  }

  return true;
}