storage/mozStorageAsyncStatementJSHelper.h
author Paul Adenot <paul@paul.cx>
Tue, 04 Apr 2017 13:47:47 +0200
changeset 351799 a436c8af1ba23ccb47f2f681fd2d32a441827e1b
parent 244682 dd79977a3286d947aff8e270245d05c05e676964
child 376569 df5b4f5fe775d341647f85abcf9a0ca0aa573a67
permissions -rw-r--r--
Bug 1341549 - Label runnables in dom/media/webaudio/ r=billm MozReview-Commit-ID: 1SG1KoVjivS

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * 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/. */

#ifndef mozilla_storage_mozStorageAsyncStatementJSHelper_h_
#define mozilla_storage_mozStorageAsyncStatementJSHelper_h_

#include "nsIXPCScriptable.h"
#include "nsIXPConnect.h"

class AsyncStatement;

namespace mozilla {
namespace storage {

/**
 * A modified version of StatementJSHelper that only exposes the async-specific
 * 'params' helper.  We do not expose 'row' or 'step' as they do not apply to
 * us.
 */
class AsyncStatementJSHelper : public nsIXPCScriptable
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIXPCSCRIPTABLE

private:
  nsresult getParams(AsyncStatement *, JSContext *, JSObject *, JS::Value *);
};

/**
 * Wrapper used to clean up the references JS helpers hold to the statement.
 * For cycle-avoidance reasons they do not hold reference-counted references,
 * so it is important we do this.
 */
class AsyncStatementParamsHolder final : public nsIXPConnectJSObjectHolder
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIXPCONNECTJSOBJECTHOLDER

  explicit AsyncStatementParamsHolder(nsIXPConnectJSObjectHolder* aHolder);

private:
  virtual ~AsyncStatementParamsHolder();
  nsCOMPtr<nsIXPConnectJSObjectHolder> mHolder;
};

} // namespace storage
} // namespace mozilla

#endif // mozilla_storage_mozStorageAsyncStatementJSHelper_h_