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| -rw-r--r-- | xpcom/components/nsComponentManagerUtils.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/xpcom/components/nsComponentManagerUtils.h b/xpcom/components/nsComponentManagerUtils.h new file mode 100644 index 0000000000..b6f15aabaa --- /dev/null +++ b/xpcom/components/nsComponentManagerUtils.h @@ -0,0 +1,170 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef nsComponentManagerUtils_h__ +#define nsComponentManagerUtils_h__ + +#include "nscore.h" +#include "nsCOMPtr.h" + +#include "nsIFactory.h" + +nsresult CallCreateInstance(const nsCID& aCID, const nsIID& aIID, + void** aResult); + +nsresult CallCreateInstance(const char* aContractID, const nsIID& aIID, + void** aResult); + +nsresult CallGetClassObject(const nsCID& aCID, const nsIID& aIID, + void** aResult); + +nsresult CallGetClassObject(const char* aContractID, const nsIID& aIID, + void** aResult); + +class MOZ_STACK_CLASS nsCreateInstanceByCID final : public nsCOMPtr_helper { + public: + nsCreateInstanceByCID(const nsCID& aCID, nsresult* aErrorPtr) + : mCID(aCID), mErrorPtr(aErrorPtr) {} + + virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override; + + private: + const nsCID& mCID; + nsresult* mErrorPtr; +}; + +class MOZ_STACK_CLASS nsCreateInstanceByContractID final + : public nsCOMPtr_helper { + public: + nsCreateInstanceByContractID(const char* aContractID, nsresult* aErrorPtr) + : mContractID(aContractID), mErrorPtr(aErrorPtr) {} + + virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override; + + private: + const char* mContractID; + nsresult* mErrorPtr; +}; + +class MOZ_STACK_CLASS nsCreateInstanceFromFactory final + : public nsCOMPtr_helper { + public: + nsCreateInstanceFromFactory(nsIFactory* aFactory, nsresult* aErrorPtr) + : mFactory(aFactory), mErrorPtr(aErrorPtr) {} + + virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override; + + private: + nsIFactory* MOZ_NON_OWNING_REF mFactory; + nsresult* mErrorPtr; +}; + +inline const nsCreateInstanceByCID do_CreateInstance(const nsCID& aCID, + nsresult* aError = 0) { + return nsCreateInstanceByCID(aCID, aError); +} + +inline const nsCreateInstanceByContractID do_CreateInstance( + const char* aContractID, nsresult* aError = 0) { + return nsCreateInstanceByContractID(aContractID, aError); +} + +inline const nsCreateInstanceFromFactory do_CreateInstance( + nsIFactory* aFactory, nsresult* aError = 0) { + return nsCreateInstanceFromFactory(aFactory, aError); +} + +class MOZ_STACK_CLASS nsGetClassObjectByCID final : public nsCOMPtr_helper { + public: + nsGetClassObjectByCID(const nsCID& aCID, nsresult* aErrorPtr) + : mCID(aCID), mErrorPtr(aErrorPtr) {} + + virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override; + + private: + const nsCID& mCID; + nsresult* mErrorPtr; +}; + +class MOZ_STACK_CLASS nsGetClassObjectByContractID final + : public nsCOMPtr_helper { + public: + nsGetClassObjectByContractID(const char* aContractID, nsresult* aErrorPtr) + : mContractID(aContractID), mErrorPtr(aErrorPtr) {} + + virtual nsresult NS_FASTCALL operator()(const nsIID&, void**) const override; + + private: + const char* mContractID; + nsresult* mErrorPtr; +}; + +/** + * do_GetClassObject can be used to improve performance of callers + * that call |CreateInstance| many times. They can cache the factory + * and call do_CreateInstance or CallCreateInstance with the cached + * factory rather than having the component manager retrieve it every + * time. + */ +inline const nsGetClassObjectByCID do_GetClassObject(const nsCID& aCID, + nsresult* aError = 0) { + return nsGetClassObjectByCID(aCID, aError); +} + +inline const nsGetClassObjectByContractID do_GetClassObject( + const char* aContractID, nsresult* aError = 0) { + return nsGetClassObjectByContractID(aContractID, aError); +} + +// type-safe shortcuts for calling |CreateInstance| +template <class DestinationType> +inline nsresult CallCreateInstance(const nsCID& aClass, + DestinationType** aDestination) { + MOZ_ASSERT(aDestination, "null parameter"); + + return CallCreateInstance(aClass, NS_GET_TEMPLATE_IID(DestinationType), + reinterpret_cast<void**>(aDestination)); +} + +template <class DestinationType> +inline nsresult CallCreateInstance(const char* aContractID, + DestinationType** aDestination) { + MOZ_ASSERT(aContractID, "null parameter"); + MOZ_ASSERT(aDestination, "null parameter"); + + return CallCreateInstance(aContractID, NS_GET_TEMPLATE_IID(DestinationType), + reinterpret_cast<void**>(aDestination)); +} + +template <class DestinationType> +inline nsresult CallCreateInstance(nsIFactory* aFactory, + DestinationType** aDestination) { + MOZ_ASSERT(aFactory, "null parameter"); + MOZ_ASSERT(aDestination, "null parameter"); + + return aFactory->CreateInstance(nullptr, NS_GET_TEMPLATE_IID(DestinationType), + reinterpret_cast<void**>(aDestination)); +} + +template <class DestinationType> +inline nsresult CallGetClassObject(const nsCID& aClass, + DestinationType** aDestination) { + MOZ_ASSERT(aDestination, "null parameter"); + + return CallGetClassObject(aClass, NS_GET_TEMPLATE_IID(DestinationType), + reinterpret_cast<void**>(aDestination)); +} + +template <class DestinationType> +inline nsresult CallGetClassObject(const char* aContractID, + DestinationType** aDestination) { + MOZ_ASSERT(aDestination, "null parameter"); + + return CallGetClassObject(aContractID, NS_GET_TEMPLATE_IID(DestinationType), + reinterpret_cast<void**>(aDestination)); +} + +#endif /* nsComponentManagerUtils_h__ */ |