storage/mozStorageAsyncStatementJSHelper.h

   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 #ifndef mozilla_storage_mozStorageAsyncStatementJSHelper_h_
   8 #define mozilla_storage_mozStorageAsyncStatementJSHelper_h_
   9
  10 #include "nsIXPCScriptable.h"
  11
  12 namespace mozilla {
  13 namespace storage {
  14
  15 class AsyncStatement;
  16 class AsyncStatementParams;
  17
  18 /**
  19  * A modified version of StatementJSHelper that only exposes the async-specific
  20  * 'params' helper.  We do not expose 'row' or 'step' as they do not apply to
  21  * us.
  22  */
  23 class AsyncStatementJSHelper : public nsIXPCScriptable {
  24  public:
  25   NS_DECL_ISUPPORTS
  26   NS_DECL_NSIXPCSCRIPTABLE
  27
  28  private:
  29   nsresult getParams(AsyncStatement*, JSContext*, JSObject*, JS::Value*);
  30 };
  31
  32 /**
  33  * Wrapper used to clean up the references JS helpers hold to the statement.
  34  * For cycle-avoidance reasons they do not hold reference-counted references,
  35  * so it is important we do this.
  36  */
  37 class AsyncStatementParamsHolder final : public nsISupports {
  38  public:
  39   NS_DECL_ISUPPORTS
  40
  41   explicit AsyncStatementParamsHolder(AsyncStatementParams* aParams)
  42       : mParams(aParams) {}
  43
  44   AsyncStatementParams* Get() const {
  45     MOZ_ASSERT(mParams);
  46     return mParams;
  47   }
  48
  49  private:
  50   virtual ~AsyncStatementParamsHolder();
  51
  52   RefPtr<AsyncStatementParams> mParams;
  53 };
  54
  55 }  // namespace storage
  56 }  // namespace mozilla
  57
  58 #endif  // mozilla_storage_mozStorageAsyncStatementJSHelper_h_