storage/mozStorageAsyncStatementJSHelper.h
author Adrian Wielgosik <adrian.wielgosik@gmail.com>
Fri, 11 May 2018 19:46:15 +0200
changeset 418219 237b7b5faa03ae808f71a5cfb8f7f6920d64941f
parent 376451 df5b4f5fe775d341647f85abcf9a0ca0aa573a67
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1460940 - Clean up most remaining C++-side uses of nsIDOMDocument. r=bz MozReview-Commit-ID: LKRnyDPNlle

/* -*- 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"

namespace mozilla {
namespace storage {

class AsyncStatement;
class AsyncStatementParams;

/**
 * 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 nsISupports {
public:
  NS_DECL_ISUPPORTS

  explicit AsyncStatementParamsHolder(AsyncStatementParams* aParams)
    : mParams(aParams)
  {
  }

  AsyncStatementParams* Get() const {
    MOZ_ASSERT(mParams);
    return mParams;
  }

private:
  virtual ~AsyncStatementParamsHolder();

  RefPtr<AsyncStatementParams> mParams;
};

} // namespace storage
} // namespace mozilla

#endif // mozilla_storage_mozStorageAsyncStatementJSHelper_h_