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
  12 class Statement;
  13
  14 namespace mozilla {
  15 namespace storage {
  16
  17 class StatementParams;
  18 class StatementRow;
  19
  20 class StatementJSHelper : public nsIXPCScriptable {
  21  public:
  22   NS_DECL_ISUPPORTS
  23   NS_DECL_NSIXPCSCRIPTABLE
  24
  25  private:
  26   nsresult getRow(Statement*, JSContext*, JSObject*, JS::Value*);
  27   nsresult getParams(Statement*, JSContext*, JSObject*, JS::Value*);
  28 };
  29
  30 /**
  31  * Wrappers used to clean up the references JS helpers hold to the statement.
  32  * For cycle-avoidance reasons they do not hold reference-counted references,
  33  * so it is important we do this.
  34  */
  35
  36 class StatementParamsHolder final : public nsISupports {
  37  public:
  38   NS_DECL_ISUPPORTS
  39
  40   explicit StatementParamsHolder(StatementParams* aParams) : mParams(aParams) {}
  41
  42   StatementParams* Get() const {
  43     MOZ_ASSERT(mParams);
  44     return mParams;
  45   }
  46
  47  private:
  48   virtual ~StatementParamsHolder();
  49
  50   RefPtr<StatementParams> mParams;
  51 };
  52
  53 class StatementRowHolder final : public nsISupports {
  54  public:
  55   NS_DECL_ISUPPORTS
  56
  57   explicit StatementRowHolder(StatementRow* aRow) : mRow(aRow) {}
  58
  59   StatementRow* Get() const {
  60     MOZ_ASSERT(mRow);
  61     return mRow;
  62   }
  63
  64  private:
  65   virtual ~StatementRowHolder();
  66
  67   RefPtr<StatementRow> mRow;
  68 };
  69
  70 }  // namespace storage
  71 }  // namespace mozilla
  72
  73 #endif  // MOZSTORAGESTATEMENTJSHELPER_H