storage/mozStorageStatementJSHelper.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 MOZSTORAGESTATEMENTJSHELPER_H
   8 #define MOZSTORAGESTATEMENTJSHELPER_H
   9
  10 #include "nsIXPCScriptable.h"
  11 #include "nsIXPConnect.h"
  12
  13 class Statement;
  14
  15 namespace mozilla {
  16 namespace storage {
  17
  18 class StatementParams;
  19 class StatementRow;
  20
  21 class StatementJSHelper : public nsIXPCScriptable
  22 {
  23 public:
  24   NS_DECL_ISUPPORTS
  25   NS_DECL_NSIXPCSCRIPTABLE
  26
  27 private:
  28   nsresult getRow(Statement *, JSContext *, JSObject *, JS::Value *);
  29   nsresult getParams(Statement *, JSContext *, JSObject *, JS::Value *);
  30 };
  31
  32 /**
  33  * Wrappers 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
  38 class StatementParamsHolder final: public nsISupports {
  39 public:
  40   NS_DECL_ISUPPORTS
  41
  42   explicit StatementParamsHolder(StatementParams* aParams)
  43     : mParams(aParams)
  44   {
  45   }
  46
  47   StatementParams* Get() const {
  48     MOZ_ASSERT(mParams);
  49     return mParams;
  50   }
  51
  52 private:
  53   virtual ~StatementParamsHolder();
  54
  55   RefPtr<StatementParams> mParams;
  56 };
  57
  58 class StatementRowHolder final: public nsISupports {
  59 public:
  60   NS_DECL_ISUPPORTS
  61
  62   explicit StatementRowHolder(StatementRow* aRow)
  63     : mRow(aRow)
  64   {
  65   }
  66
  67   StatementRow* Get() const {
  68     MOZ_ASSERT(mRow);
  69     return mRow;
  70   }
  71
  72 private:
  73   virtual ~StatementRowHolder();
  74
  75   RefPtr<StatementRow> mRow;
  76 };
  77
  78 } // namespace storage
  79 } // namespace mozilla
  80
  81 #endif // MOZSTORAGESTATEMENTJSHELPER_H