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 {
  26 public:
  27   NS_DECL_ISUPPORTS
  28   NS_DECL_NSIXPCSCRIPTABLE
  29
  30 private:
  31   nsresult getParams(AsyncStatement *, JSContext *, JSObject *, JS::Value *);
  32 };
  33
  34 /**
  35  * Wrapper used to clean up the references JS helpers hold to the statement.
  36  * For cycle-avoidance reasons they do not hold reference-counted references,
  37  * so it is important we do this.
  38  */
  39 class AsyncStatementParamsHolder final : public nsISupports {
  40 public:
  41   NS_DECL_ISUPPORTS
  42
  43   explicit AsyncStatementParamsHolder(AsyncStatementParams* aParams)
  44     : mParams(aParams)
  45   {
  46   }
  47
  48   AsyncStatementParams* Get() const {
  49     MOZ_ASSERT(mParams);
  50     return mParams;
  51   }
  52
  53 private:
  54   virtual ~AsyncStatementParamsHolder();
  55
  56   RefPtr<AsyncStatementParams> mParams;
  57 };
  58
  59 } // namespace storage
  60 } // namespace mozilla
  61
  62 #endif // mozilla_storage_mozStorageAsyncStatementJSHelper_h_