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