xpcom/components/nsServiceManagerUtils.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   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 nsServiceManagerUtils_h__
   8 #define nsServiceManagerUtils_h__
   9
  10 #include "nsCOMPtr.h"
  11 #include "nsString.h"
  12
  13 inline const nsGetServiceByCID do_GetService(const nsCID& aCID) {
  14   return nsGetServiceByCID(aCID);
  15 }
  16
  17 inline const nsGetServiceByCIDWithError do_GetService(const nsCID& aCID,
  18                                                       nsresult* aError) {
  19   return nsGetServiceByCIDWithError(aCID, aError);
  20 }
  21
  22 inline const nsGetServiceByContractID do_GetService(const char* aContractID) {
  23   return nsGetServiceByContractID(aContractID);
  24 }
  25
  26 inline const nsGetServiceByContractIDWithError do_GetService(
  27     const char* aContractID, nsresult* aError) {
  28   return nsGetServiceByContractIDWithError(aContractID, aError);
  29 }
  30
  31 class MOZ_STACK_CLASS nsGetServiceFromCategory final : public nsCOMPtr_helper {
  32  public:
  33   nsGetServiceFromCategory(const nsACString& aCategory,
  34                            const nsACString& aEntry, nsresult* aErrorPtr)
  35       : mCategory(aCategory), mEntry(aEntry), mErrorPtr(aErrorPtr) {}
  36
  37   virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override;
  38
  39  protected:
  40   const nsCString mCategory;
  41   const nsCString mEntry;
  42   nsresult* mErrorPtr;
  43 };
  44
  45 inline const nsGetServiceFromCategory do_GetServiceFromCategory(
  46     const nsACString& aCategory, const nsACString& aEntry,
  47     nsresult* aError = 0) {
  48   return nsGetServiceFromCategory(aCategory, aEntry, aError);
  49 }
  50
  51 nsresult CallGetService(const nsCID& aClass, const nsIID& aIID, void** aResult);
  52
  53 nsresult CallGetService(const char* aContractID, const nsIID& aIID,
  54                         void** aResult);
  55
  56 // type-safe shortcuts for calling |GetService|
  57 template <class DestinationType>
  58 inline nsresult CallGetService(const nsCID& aClass,
  59                                DestinationType** aDestination) {
  60   MOZ_ASSERT(aDestination, "null parameter");
  61
  62   return CallGetService(aClass, NS_GET_TEMPLATE_IID(DestinationType),
  63                         reinterpret_cast<void**>(aDestination));
  64 }
  65
  66 template <class DestinationType>
  67 inline nsresult CallGetService(const char* aContractID,
  68                                DestinationType** aDestination) {
  69   MOZ_ASSERT(aContractID, "null parameter");
  70   MOZ_ASSERT(aDestination, "null parameter");
  71
  72   return CallGetService(aContractID, NS_GET_TEMPLATE_IID(DestinationType),
  73                         reinterpret_cast<void**>(aDestination));
  74 }
  75
  76 #endif