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  public:
  23   NS_DECL_ISUPPORTS
  24   NS_DECL_NSIXPCSCRIPTABLE
  25
  26  private:
  27   nsresult getRow(Statement *, JSContext *, JSObject *, JS::Value *);
  28   nsresult getParams(Statement *, JSContext *, JSObject *, JS::Value *);
  29 };
  30
  31 /**
  32  * Wrappers used to clean up the references JS helpers hold to the statement.
  33  * For cycle-avoidance reasons they do not hold reference-counted references,
  34  * so it is important we do this.
  35  */
  36
  37 class StatementParamsHolder final : public nsISupports {
  38  public:
  39   NS_DECL_ISUPPORTS
  40
  41   explicit StatementParamsHolder(StatementParams *aParams) : mParams(aParams) {}
  42
  43   StatementParams *Get() const {
  44     MOZ_ASSERT(mParams);
  45     return mParams;
  46   }
  47
  48  private:
  49   virtual ~StatementParamsHolder();
  50
  51   RefPtr<StatementParams> mParams;
  52 };
  53
  54 class StatementRowHolder final : public nsISupports {
  55  public:
  56   NS_DECL_ISUPPORTS
  57
  58   explicit StatementRowHolder(StatementRow *aRow) : mRow(aRow) {}
  59
  60   StatementRow *Get() const {
  61     MOZ_ASSERT(mRow);
  62     return mRow;
  63   }
  64
  65  private:
  66   virtual ~StatementRowHolder();
  67
  68   RefPtr<StatementRow> mRow;
  69 };
  70
  71 }  // namespace storage
  72 }  // namespace mozilla
  73
  74 #endif  // MOZSTORAGESTATEMENTJSHELPER_H